android build

build-android/CMakeLists.txt

@@ -0,0 +1,25 @@
+cmake_minimum_required(VERSION 3.4.1)
+
+string(TOLOWER ${CMAKE_BUILD_TYPE} ANDROID_BUILD_DIR)
+set(DISTRIBUTION_DIR ${CMAKE_SOURCE_DIR}/android/distribution/android/SDL2/intermediates/ndkBuild)
+set(SOURCE_FILES src/audio.c src/colours.c src/datatypes.c src/environment.c src/main.c src/vect.c src/basic-lib.c src/controlscheme.c src/draw.c src/game.c src/physics.c)
+set(SDL_LOCATION ${CMAKE_SOURCE_DIR}/external/SDL2)
+
+add_library( SDL2 SHARED IMPORTED )
+add_library( SDL2_mixer SHARED IMPORTED )
+add_library( SDL2_ttf SHARED IMPORTED )
+set_target_properties(SDL2 PROPERTIES IMPORTED_LOCATION
+${DISTRIBUTION_DIR}/${ANDROID_BUILD_DIR}/obj/local/${ANDROID_ABI}/libSDL2.so)
+set_target_properties(SDL2_mixer PROPERTIES IMPORTED_LOCATION
+${DISTRIBUTION_DIR}/${ANDROID_BUILD_DIR}/obj/local/${ANDROID_ABI}/libSDL2_mixer.so)
+set_target_properties(SDL2_ttf PROPERTIES IMPORTED_LOCATION
+${DISTRIBUTION_DIR}/${ANDROID_BUILD_DIR}/obj/local/${ANDROID_ABI}/libSDL2_ttf.so)
+
+include_directories(${SDL_LOCATION}/SDL2/SDL2/incl2)
+include_directories(${SDL_LOCATION}/SDL2/include)
+include_directories(${SDL_LOCATION}/SDL2_mixer)
+include_directories(${SDL_LOCATION}/SDL2_ttf)
+
+add_library( main SHARED ${SDL_LOCATION}/SDL2/src/main/android/SDL_android_main.c ${SOURCE_FILES} )
+
+target_link_libraries( main SDL2 SDL2_mixer SDL2_ttf)

build-android/LICENSE

@@ -0,0 +1,20 @@
+
+hello-sdl2-android
+Copyright (C) 2017 Paul Vallet <luap.vallet@gmail.com>
+  
+This software is provided 'as-is', without any express or implied
+warranty.  In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+  
+1. The origin of this software must not be misrepresented; you must not
+   claim that you wrote the original software. If you use this software
+   in a product, an acknowledgment in the product documentation would be
+   appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be
+   misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+

build-android/README.md

@@ -0,0 +1,56 @@
+# hello-sdl2-android
+
+## Synopsis
+
+This project is an update of the hello world project here https://github.com/stephen47/android-sdl2-gradle-template, as I couldn't find a good way to integrate a CMake built C++ project to an android application.
+It features a sample hello world using SDL and SDL_image.
+
+## Requirements
+- JDK and JRE 8
+- Android SDK and NDK (with Android Build-tools 28.0.3 and Android Platform API 28, though these are configurable)
+- ANDROID_HOME and ANDROID_NDK_HOME environment variables set (I did this in /etc/environment)
+
+## Compiling the sample program (command line)
+
+You can download the dependencies (SDL2 and SDL2_image), compile your program and then install it on a connected device with the following commands:
+```
+./get_dependencies
+cd android
+./gradlew assembleDebug
+./gradlew installDebug
+```
+
+## Compiling the sample program (Android Studio 3.2.1)
+
+First download the dependencies (SDL2 and SDL2_image) as above or manually like below. Then open the ./android folder as an existing project in Android Studio.
+
+## Downloading dependencies manually
+
+Download the latest source release from SDL and SDL_image websites:
+
+https://www.libsdl.org/download-2.0.php
+https://www.libsdl.org/projects/SDL_image/
+
+Unzip it, put the SDL2-x.x.x and SDL2_image-x.x.x folders in `external/SDL2` and rename them to SDL2 and SDL2_image so your project folder looks like this:
+```
++ android
++ external
+| + SDL2
+| | + Android.mk
+| | | SDL2
+| | | SDL2_image
+```
+
+There, it's done!
+
+## Thanks
+
+Most of the code here is inspired by these repositories:
+
+https://github.com/stephen47/android-sdl2-gradle-template (Android + gradle)
+
+https://github.com/suikki/simpleSDL/ (Android + CMake)
+
+The example libSDL2 program which draws the square on screen was found at https://stackoverflow.com/questions/21890627/drawing-a-rectangle-with-sdl2/21903973#21903973.
+
+The Google NDK example projects were very helpful: https://github.com/googlesamples/android-ndk

build-android/android/.gitignore

@@ -0,0 +1,3 @@
+distribution/
+.gradle/
+.idea/

build-android/android/SDL2/.gitignore

@@ -0,0 +1 @@
+.externalNativeBuild/

build-android/android/SDL2/build.gradle

@@ -0,0 +1,38 @@
+apply plugin: 'com.android.library'
+
+android {
+    compileSdkVersion 28
+    buildToolsVersion "28.0.3"
+
+    defaultConfig {
+        minSdkVersion 21
+        targetSdkVersion 28
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+	ndk {
+            abiFilters "armeabi-v7a"
+        }
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+    externalNativeBuild {
+        ndkBuild {
+            path '../../external/SDL2/Android.mk'
+        }
+    }
+}
+
+dependencies {
+    compile fileTree(dir: 'libs', include: ['*.jar'])
+    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
+        exclude group: 'com.android.support', module: 'support-annotations'
+    })
+    compile 'com.android.support:appcompat-v7:28.0.0'
+    testCompile 'junit:junit:4.12'
+}

build-android/android/SDL2/proguard-rules.pro

@@ -0,0 +1,25 @@
+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in /home/luap/Logiciels/android-sdk/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the proguardFiles
+# directive in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

build-android/android/app/.gitignore

@@ -0,0 +1 @@
+.externalNativeBuild/

build-android/android/app/build.gradle

@@ -0,0 +1,45 @@
+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 28
+    buildToolsVersion "28.0.3"
+    defaultConfig {
+        applicationId "pvallet.com.github.hello_sdl2"
+        minSdkVersion 21
+        targetSdkVersion 28
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        externalNativeBuild {
+            cmake {
+                cppFlags "-std=c++11 -frtti -fexceptions"
+            }
+        }
+	ndk {
+            abiFilters "armeabi-v7a"
+        }
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+    externalNativeBuild {
+        cmake {
+            path "../../CMakeLists.txt"
+        }
+    }
+}
+
+dependencies {
+    compile fileTree(dir: 'libs', include: ['*.jar'])
+    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
+        exclude group: 'com.android.support', module: 'support-annotations'
+    })
+    compile 'com.android.support:appcompat-v7:28.0.0'
+    // Uncomment this line to build SDL2
+    // Uncomment a line in ../gradle.settings as well
+	compile project(':SDL2')
+    testCompile 'junit:junit:4.12'
+}

build-android/android/app/proguard-rules.pro

@@ -0,0 +1,25 @@
+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in /home/luap/Logiciels/android-sdk/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the proguardFiles
+# directive in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

build-android/android/build.gradle

@@ -0,0 +1,31 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+
+buildscript {
+    repositories {
+        google()
+        jcenter()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:3.2.1'
+
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+// Instead of having a build dir inside android app dir use the same project top level build dir to reduce clutter
+buildDir = file("distribution/${rootProject.name}/${project.name}")
+subprojects {
+	buildDir = file("../distribution/${rootProject.name}/${project.name}")
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+    }
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}

build-android/android/gradle.properties

@@ -0,0 +1,17 @@
+# Project-wide Gradle settings.
+
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx1536m
+
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. More details, visit
+# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
+# org.gradle.parallel=true

build-android/android/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Wed Jul 05 15:54:11 CEST 2017
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.9-all.zip

build-android/android/gradlew

@@ -0,0 +1,160 @@
+#!/usr/bin/env bash
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn ( ) {
+    echo "$*"
+}
+
+die ( ) {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+esac
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules
+function splitJvmOpts() {
+    JVM_OPTS=("$@")
+}
+eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS
+JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME"
+
+exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@"

build-android/android/gradlew.bat

@@ -0,0 +1,90 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windowz variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+if "%@eval[2+2]" == "4" goto 4NT_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+goto execute
+
+:4NT_args
+@rem Get arguments from the 4NT Shell from JP Software
+set CMD_LINE_ARGS=%$
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

build-android/android/settings.gradle

@@ -0,0 +1,4 @@
+include ':app'
+// Uncomment this line to build SDL2
+// Uncomment the dependency line in app/build.gradle as well
+include ':SDL2'

build-android/get_dependencies.sh

@@ -0,0 +1,17 @@
+#!/bin/bash -x
+
+pushd external/SDL2
+
+wget https://www.libsdl.org/release/SDL2-2.0.8.zip
+unzip -q SDL2-2.0.8.zip
+mv SDL2-2.0.8 SDL2
+rm SDL2-2.0.8.zip
+
+wget https://www.libsdl.org/projects/SDL_image/release/SDL2_image-2.0.3.zip
+unzip -q SDL2_image-2.0.3.zip
+mv SDL2_image-2.0.3 SDL2_image
+rm SDL2_image-2.0.3.zip
+
+popd
+# No need to copy SDLActivity.java et al, repo contains those from 2.0.8
+# cp external/SDL2/SDL2/android-project/app/src/main/java/org/libsdl/app/*.java android/app/src/main/java/org/libsdl/app/

build-android/src/audio.c

@@ -0,0 +1,226 @@
+#include "audio.h"
+#include <SDL_keycode.h>
+#include <SDL_mixer.h>
+#include <SDL_mutex.h>
+
+void generate_audio(void);
+struct game_sounds game_sounds;
+
+Uint8 big_hum(unsigned int t); 
+Uint8 func0(unsigned int t); 
+
+int mute = false;
+
+ void fill_audio(void *func, Uint8 *stream, int len) {
+     Uint8 (*wavegen)(unsigned int) = func;
+
+    unsigned int t = 1;
+    for(int i = 0; i < len; i++,t++) {
+        stream[i] = wavegen(t);
+    }
+}
+
+void callbackfn3(void *unused, Uint8 *stream, int len) {
+    static int t = 1;
+    for(int i = 0; i < len; i++,t++) {
+        stream[i] = big_hum(t);
+        stream[i] = 0; 
+    }
+}
+
+void start_audio(void) {
+ 
+    //audio_format.callback = callbackfn3;
+    /* just for playing background music 
+    if (SDL_OpenAudio(&audio_format, NULL)) {
+        fprintf(stderr, "Unable to open audio: %s\n", SDL_GetError());
+        exit(1);
+    }
+    */
+    //SDL_PauseAudio(0);
+    if (Mix_OpenAudio(G_AUDIO_SFREQ,AUDIO_U8,1,G_AUDIO_BSIZE) < 0) {
+        fprintf(stderr, "Unable to open audio: %s\n", SDL_GetError());
+        exit(1);
+    }
+
+    if (Mix_AllocateChannels(20) < 0) {
+        fprintf(stderr, "Unable to open audio: %s\n", SDL_GetError());
+    }
+
+    generate_audio();
+
+}
+
+void 
+play_game_sound(Mix_Chunk *chunk, int len, int channel) 
+{
+    if (mute || Mix_Playing(channel)) {
+        return;
+    }
+
+    if(Mix_PlayChannelTimed(channel, chunk, -1, len) < 0)
+        fprintf(stderr, "Unable to play audio: %s\n", SDL_GetError());
+    //Mix_FadeInChannelTimed(channel, chunk, -1, 1, len);
+}
+
+Uint8 
+pitchshift_hit(unsigned int t, void *arg) 
+{
+    double *hitt = arg;
+    double hit = *hitt;
+    hit = 6 - hit;
+    int lower = 10 + 2 * (hit > 6 ? 6 : hit);
+    int higher = 1 + (hit > 6 ? 6 : hit);
+//    printf("mag %f higher %d lower %d\n", hit, higher, lower);
+
+    const double R=8000; // sample rate (samples per second)
+    const double C=125; // frequency of middle-C (hertz)
+    const double F=R/256; // bytebeat frequency of 1*t due to 8-bit truncation (hertz)
+    const double V=127; // a volume constant
+    double volume = (((t / 3000) > 2) ? 2 : t / 3000);
+
+    return ((sin(t*2*M_PI/R*(125 + hit))+1)*10 + (sin(t*2*M_PI/R*(250 + hit))+1)*(50 + hit) + (sin(t*2*M_PI/R*(900 + hit))+1)*100 + (sin(t*2*M_PI/R*(150+ hit))+1)*5) ;
+
+    return ((t < 3000) * ((t % higher) * (3000 - t % 3000) * 0.00351));
+        //+ ((t < 3500) * ((3500 - t % 3500)) * 0.0002 * (t % lower));
+}
+
+void 
+synthplay_now(Uint8 (*bbgen)(unsigned int t, void *), void *arg, int len) 
+{
+    static Mix_Chunk *new_chunk = NULL;
+
+    if (Mix_Playing(1)) {
+        return;
+    }
+
+    if (new_chunk)
+        Mix_FreeChunk(new_chunk);
+
+    int generate_len = len * (512);
+
+    Uint8 raw_data[generate_len];
+
+    unsigned int t = 1;
+    for(int i = 0; i < generate_len; i++,t++) {
+        raw_data[i] = bbgen(t, arg);
+    }
+
+    new_chunk = Mix_QuickLoad_RAW(raw_data, generate_len);
+    Mix_PlayChannelTimed(1, new_chunk, -1, len);
+}
+
+
+
+void callbackfn2(void *unused, Uint8 *stream, int len) {
+    static int t = 1;
+    int i;
+    int yeet = rand();
+    for(i=0; i < len; i++,t++) {
+        stream[i] = func0(t);
+    }
+}
+
+
+void callbackfn(void *unused, Uint8 *stream, int len)
+{
+    static int t = 0;
+    int i;
+    int yeet = rand();
+    for( i=0; i < len; i++,t++) {
+    /*
+            stream[i] = (t*5&(t>>7))|(t*3&(t>>8));
+    */
+    //stream[i] = (( t >> 10 ) & 42) * t;
+    stream[i] = (t & yeet) % 73;
+    }
+}
+
+/* Waveform Generators */
+
+Uint8 big_hum(unsigned int t) {
+    return ( (sin(t*2*3.14159265/8000*200)+1) * 20) + ( (sin(t*2*3.14159265/8000*110)+1) * 20) + ( (sin(t*2*3.14159265/8000*230)+1) * 20) + ( (sin((t % 80)*2*3.14159265/8000 * 6)+1) * 12);
+}
+
+unsigned int sine_wave_sound(unsigned int t) {
+    const double R=8000; // sample rate (samples per second)
+    const double C=261.625565; // frequency of middle-C (hertz)
+    const double F=R/256; // bytebeat frequency of 1*t due to 8-bit truncation (hertz)
+    const double V=127; // a volume constant
+    return (sin(t*2*M_PI/R*C)+1)*V;
+}
+
+Uint8 winch_sound(unsigned t) {
+    return (((t % 80) | (t % 36) | (6 * (t % 6))) + 20) * 1.6;
+    return ((t % 80) | (t % 36) | (6 * (t % 6)));
+}
+
+Uint8 beat_2(unsigned t) {
+    return ((((t % 250) / 2)) | (t % 129)) % 110;
+}
+
+Uint8 func0(unsigned t) {
+    int note = 18;
+    if (!(t % 1240)) {
+        note = (1 + rand()) % 18 + 1;
+    }
+
+    fflush(stdout);
+    return (t % note);
+}
+
+Uint8 func1(unsigned int t) {
+    int note = 10;
+    if (!(t % 8000)) {
+        note = (1 + rand()) % 10 + 5;
+    }
+    return ((t & 110) % 73 | (t % 1711));
+}
+
+Uint8 collision_test(unsigned int t) {
+    // try not to loop
+    return ((t < 3000) * ((t % 5) * (3000 - t % 3000) * 0.00351)) 
+        + ((t < 3500) * ((3500 - t % 3500)) * 0.0002 * (t % 14));
+    return ((t < 3000) * ((t % 5) * (3000 - t % 3000) * 0.00351)) 
+        + ((4000 - t % 4000) * 0.0003 * (t % 128)) 
+        + ((t < 3500) * ((3500 - t % 3500)) * 0.0002 * (t % 64)); // has a big low sound
+    return (t % 4) * (4000 - t % 4000) * 0.01;
+}
+
+
+Uint8 boop_noise(unsigned int t) {
+    return ((t >> 10) & 42) * t;
+}
+
+Uint8 rope_attach(unsigned int t) {
+    return (((2000 - (t % 2000)))/40 * (t % 20) | (t % 44) + 20) * 1.6;
+}
+
+void generate_audio(void) {
+    const int sfx_len_ms = 1000;
+    unsigned int sfx_len = (G_AUDIO_SFREQ/1000) * G_AUDIO_BSIZE * sfx_len_ms;
+    sfx_len = G_AUDIO_BSIZE;
+
+    Uint8 *raw_data = malloc(sfx_len); 
+    fill_audio(winch_sound, raw_data, sfx_len);
+    game_sounds.rope_pull = Mix_QuickLoad_RAW(raw_data, sfx_len);
+    Mix_Volume(BC_ROPE_PULL, MIX_MAX_VOLUME * 0.3);
+
+    Uint8 *raw_data2 = malloc(sfx_len); 
+    fill_audio(collision_test, raw_data2, sfx_len);
+    game_sounds.collision = Mix_QuickLoad_RAW(raw_data2, sfx_len);
+    Mix_Volume(BC_COLLISION, MIX_MAX_VOLUME * 1.2);
+
+    Uint8 *raw_data3 = malloc(sfx_len); 
+    fill_audio(big_hum, raw_data3, sfx_len);
+    game_sounds.background = Mix_QuickLoad_RAW(raw_data3, sfx_len);
+    Mix_Volume(BC_MUSIC, MIX_MAX_VOLUME * 0.1);
+
+    Uint8 *raw_data4 = malloc(sfx_len); 
+    fill_audio(rope_attach, raw_data4, sfx_len);
+    game_sounds.rope_attach = Mix_QuickLoad_RAW(raw_data4, sfx_len);
+    Mix_Volume(BC_ROPE_ATTACH, MIX_MAX_VOLUME * 0.1);
+
+}
+
+

build-android/src/audio.h

@@ -0,0 +1,37 @@
+
+#ifndef AUDIO_H
+#define AUDIO_H
+
+#include <SDL_audio.h>
+#include "types.h"
+#include <math.h>
+#include <stdlib.h>
+
+#define G_AUDIO_SFREQ 8000
+#define G_AUDIO_BSIZE 512
+
+struct game_sounds {
+    unsigned int t;
+    Mix_Chunk *collision;
+    Mix_Chunk *rope_attach;
+    Mix_Chunk *rope_pull;
+    Mix_Chunk *background;
+    /* Looping samples (need backbuffer to fill while playing ) */
+    Mix_Chunk *menu;
+};
+
+extern struct game_sounds game_sounds;
+
+void play_game_sound(Mix_Chunk *chunk, int len, int channel);
+void start_audio(void); 
+
+Uint8 pitchshift_hit(unsigned int t, void *arg);
+void synthplay_now(Uint8 (*bbgen)(unsigned int t, void *), void *arg, int len); 
+
+enum audio_channel_names {
+    BC_COLLISION = 1,
+    BC_ROPE_PULL = 2,
+    BC_ROPE_ATTACH = 3,
+    BC_MUSIC = 4,
+};
+#endif

build-android/src/basic-lib.c

@@ -0,0 +1,97 @@
+#include <stdio.h>
+#include <time.h>
+#include <string.h>
+
+//   #define LOGGING 1
+//  #define log_var(string, content) if (LOGGING) {time_t current_time; time(&current_time); printf("%s",asctime(localtime(&current_time))); printf(string, content);}
+// #define log_str(string) if (LOGGING) {time_t current_time; time(&current_time); puts(asctime(localtime(&current_time))); puts(string);}
+
+void enumerate_string(char test_array[]) {
+    char *ptr;
+    ptr = &(test_array[0]);
+    for (int i=0; i<5; i++) {
+        printf("%c", *(ptr + i));
+    }
+}
+
+int copy_str(char * out_string, char * string) {
+    /* A drop in replacement for strcpy() from <string.h>*/
+    int len = 0;
+    while (*(string + len) != '\0') {
+        *(out_string + len) = *(string + len);
+        len++;
+    }
+    *(out_string + len) =  '\0';
+    return (1);
+}
+
+int get_str_len(char * string) {
+    int len = 0;
+    while (*(string + len) != '\0') {
+        len++;
+    }
+    return(len);
+}
+
+void replace_char(char * array, char * charac) {
+    int length;
+    length =  sizeof(*array)/sizeof(char);
+    char combined[length];
+
+    int i = 0;
+    int counter = 0;
+
+    while (*(array + i) != '\0') {
+        if (*(array + i) != *charac)  {
+            *(array + counter) = *(array + i);
+            counter++;
+        }
+        i++;
+    }
+    *(array + counter + 1) = '\0';
+}
+
+void join_strings(char * return_val, char * str_1, char * str_2) {
+
+    int len1 = get_str_len(str_1);
+    int len2 = get_str_len(str_2);
+
+    int length = len1 + len2;
+    char combined[length+1];
+    int i = 0;
+    int j = 0;
+
+    while (*(str_1 + i) != '\0') {
+            combined[i] = *(str_1 + i);
+            i++;
+    }
+
+    while (*(str_2 + j) != '\0') {
+        combined[len1+j] = *(str_2 + j);
+        j++;
+    }
+    copy_str(return_val, combined);
+}
+
+void get_time(void) {
+    char time_str[100];
+    time_t current_time;
+    time(&current_time); 
+    copy_str(time_str, asctime(localtime(&current_time)));
+
+    strcat(time_str, "hello world");
+    //replace_char(&(time_str[0]), "\n");
+    printf("%s", time_str);
+
+    char string[20];
+    copy_str(string, "NONEWLINEhello");
+
+
+    replace_char(&(time_str[0]), "\n");
+    char newstr[120];
+    join_strings(&(newstr[0]), &(time_str[0]), &(string[0]));
+    replace_char(&(newstr[0]), "\n");
+
+    printf("%s", newstr);
+}
+

build-android/src/colours.c

@@ -0,0 +1,238 @@
+#include "colours.h"
+
+struct colour get_random_color(unsigned int seed) {
+    srand(seed);
+    int red = rand() % 255;
+    int blue = rand() % 255;
+    int green = rand() % 255;
+
+    struct colour col;
+    col.r = red;
+    col.g = green;
+    col.b = blue;
+    return col;
+}
+
+double m_min(double arr[], int len) {
+    double largest = arr[0];
+    for (int i = 0; i < len; i ++) {
+        if (arr[i] < largest) {
+            largest = arr[i];
+        }
+    }
+    return largest;
+}
+
+double m_max(double arr[], int len) {
+    double largest = arr[0];
+    for (int i = 0; i < len; i ++) {
+        if (arr[i] > largest) {
+            largest = arr[i];
+        }
+    }
+    return largest;
+}
+
+bool m_equal(double a, double b) {
+    return (a - b) * (a - b)  < 0.00001;
+}
+
+// https://en.wikipedia.org/wiki/HSL_and_HSV#From_RGB
+// h = [0,360], s = [0,1], v = [0,1] 
+// if s == 0, then h = -1 (undefined)
+struct colour get_hs_l_v(struct colour c, enum colour_space sp) {
+    struct colour ret;
+    memset(&ret, 0, sizeof(struct colour));
+    double r = (double)c.r / 255;
+    double g = (double)c.g / 255;
+    double b = (double)c.b / 255;
+
+    double arr[] = {r, g, b};
+    double max = m_max(arr, 3);
+    double min = m_min(arr, 3);
+
+    ret.v = max;
+
+    double chroma = max - min;
+
+    double lum = (max + min) / 2;
+    ret.l = lum;
+
+    if (m_equal(chroma, 0)) {
+        ret.h = 0;
+    } else if (m_equal(ret.v,r)) {
+        ret.h = (g - b) / chroma;
+    } else if (m_equal(max,g)) {
+        ret.h = 2 + (b - r) / chroma;
+    } else if (m_equal(max,b)) {
+        ret.h = 4 + (r - g) / chroma;
+    } else {
+        printf("NOPE BAD ERROR\n");
+    } 
+
+    ret.h *= 60;
+    ret.h = fmod(ret.h, 360);
+    if (ret.h < 0) {
+        ret.h += 360;
+    }
+
+    if (sp == CS_HSV) {
+        if (m_equal(max,0)) {
+            ret.s = 0;
+        } else {
+            ret.s = chroma / max;
+        }
+    } else {
+        double arr[] = {ret.l, 1 - ret.l};
+        if (m_equal(0, lum) || m_equal(1, lum)) {
+            ret.s = 0;
+        } else {
+            ret.s = (ret.v - ret.l) / m_min(arr, 2); 
+        }
+    }
+    ret.sp = CS_HSL;
+    return ret;
+}
+
+struct colour get_hsl(struct colour c) {
+    return get_hs_l_v(c, CS_HSL); 
+}
+
+struct colour get_hsv(struct colour c) {
+    return get_hs_l_v(c, CS_HSV); 
+}
+
+double magic_hsv_function(int n, struct colour c) {
+    double res = 0;
+    double k = fmod(n + (c.h / 60), 6);
+    double arr[] = {k, 4 - k, 1};
+    double k_b = m_min(arr, 3);
+    double k_c = 0 > k_b ? 0 : k_b;
+    res = c.v - c.v * c.s * k_c; 
+    return res;
+}
+
+struct colour get_rgb_from_hsv(struct colour c) {
+
+    double r = magic_hsv_function(5, c);
+    double g = magic_hsv_function(3, c);
+    double b = magic_hsv_function(1, c);
+
+    struct colour res;
+    res.r = round(r * 255);
+    res.g = round(g * 255);
+    res.b = round(b * 255);
+    return res;
+
+}
+
+double magic_hsl_function(int n, struct colour c) {
+    double arr[] = {c.l, 1-c.l};
+    double a = c.s * ( c.l < (1-c.l) ? c.l : 1 - c.l );
+    double k = fmod(n + c.h / 30, 12);
+
+    double b[] = {k - 3, 9 -k, 1};
+    double d[] = {-1, m_min(b, 3)};
+    return c.l - a * (d[0] > d[1] ? d[0] : d[1]);
+}
+
+struct colour get_rgb_from_hsl(struct colour c) {
+    double r = magic_hsl_function(0, c);
+    double g = magic_hsl_function(8, c);
+    double b = magic_hsl_function(4, c);
+
+    struct colour res;
+    res.r = round(r * 255);
+    res.g = round(g * 255);
+    res.b = round(b * 255);
+    return res;
+}
+
+struct colour get_rgb(struct colour c) {
+    if (c.sp == CS_HSL) {
+        return get_rgb_from_hsl(c);
+    }
+    if (c.sp == CS_HSV) {
+        return get_rgb_from_hsv(c);
+    }
+
+    struct colour d;
+    memset(&d, 0, sizeof(struct colour));
+    return d;
+}
+
+int compare_perceived_lum(const void* c1, const void* c2) {
+    struct colour rgb_c1 = *(struct colour*)c1;
+    struct colour rgb_c2 = *(struct colour*)c2;
+
+    double lum1 = 0.299*rgb_c1.r + 0.587*rgb_c1.g + 0.114*rgb_c1.b;
+    double lum2 = 0.299*rgb_c2.r + 0.587*rgb_c2.g + 0.114*rgb_c2.b;
+    return lum1 - lum2;
+}
+
+struct colour *get_adjacent(struct colour base, int deg, int num) {
+    struct colour col = get_hsl(base);
+    num += 1;
+
+    struct colour* colours = calloc(sizeof(struct colour), num); 
+
+    for (int i = 0; i < num; i++) {
+        int m = (i % 2 == 0) ? -i : i;
+
+        colours[i] = col;
+        colours[i].h += m * deg;
+        colours[i].h += fmod(colours[i].h, 360);
+    }
+
+    struct colour *ret_colours = calloc(num, sizeof(struct colour) * num);
+
+    for (int i = 0; i < num; i++) {
+        ret_colours[i] = get_rgb(colours[i]);
+    }
+
+    // sort from dark to bright
+    qsort(ret_colours, num, sizeof(struct colour), compare_perceived_lum);
+
+    free(colours);
+    return ret_colours;
+}
+
+void print_colour(struct colour c) {
+    char *colour = calloc(20, sizeof(char));
+    sprintf(colour, "#%02x%02x%02x", c.r, c.g, c.b);
+    
+    printf("\x1b[38;2;%d;%d;%dm%s\x1b[0m\n", c.r, c.g, c.b, colour);
+    free(colour);
+}
+
+void test(int seed) {
+    struct colour c = get_random_color(seed);
+    //print_colour(c);
+    struct colour hsl = get_hsl(c);
+    struct colour hsv = get_hsv(c);
+    /*printf("RGB: %d %d %d\n",c.r,c.g,c.b);*/
+    /*printf("HSL: %f %f %f\n",hsl.h, hsl.s, hsl.l);*/
+    /*printf("HSV: %f %f %f\n",hsv.h, hsv.s, hsv.v);*/
+
+    struct colour *adj = get_adjacent(c, 5, 4);
+    for (int i = 0; i < 5; i++) {
+        print_colour(adj[i]);
+    }
+
+    free(adj);
+    printf("\n");
+}
+
+void test_print_wheel() {
+    struct colour c;
+    c.s = 0.999;
+    c.v = 0.99;
+    c.l = 0.5;
+    c.sp = CS_HSV;
+    for(int i = 0; i < 360; i+=5) {
+        c.h = (double)i;
+        struct colour rgb = get_rgb(c);
+        print_colour(rgb);
+
+    }
+}

build-android/src/colours.h

@@ -0,0 +1,43 @@
+
+#ifndef COSMOPOLITAN
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include <stdio.h>
+#endif
+
+#ifndef H_COLOURS
+#define H_COLOURS
+
+enum colour_space {
+    CS_INVALID = 0,
+    CS_RGB = 1, // default to RGB
+    CS_HSV = 2,
+    CS_HSL = 3,
+};
+
+struct colour {
+    double h;
+    double s;
+    double v;
+    double l;
+    int r;
+    int g;
+    int b;
+    enum colour_space sp;
+};
+
+struct colour get_random_color(unsigned int seed);
+
+// doesn't support hsl-hsv or converse, conversion
+struct colour get_hsl(struct colour c);
+struct colour get_hsv(struct colour c); 
+
+struct colour get_rgb(struct colour c); 
+
+struct colour *get_adjacent(struct colour base, int deg, int num); 
+
+void print_colour(struct colour c); 
+
+#endif

build-android/src/controlscheme.c

@@ -0,0 +1,106 @@
+
+#include "controlscheme.h"
+#include <SDL_scancode.h>
+
+#ifdef LOAD_INPUTS
+#include <sys/stat.h>
+#endif 
+
+struct InputMap input_map;
+
+#define INPUT_MAP_ID 83921864
+#define INPUT_MAP_VERSION 0
+#define CONTROLS_FNAME "controls.bin"
+
+struct InputMap_Ser {
+    unsigned int id;
+    unsigned int ver;
+    struct InputMap input_map;
+};
+
+int load_controls(void); 
+
+void get_input_map(void) {
+
+#ifdef LOAD_INPUTS
+    if (load_controls())  {
+        return;
+    }
+#endif
+
+    input_map.player_down = SDL_SCANCODE_S;
+    input_map.player_up = SDL_SCANCODE_W;
+    input_map.player_right = SDL_SCANCODE_D;
+    input_map.player_left = SDL_SCANCODE_A;
+    input_map.player_rope = SDL_SCANCODE_E;
+    input_map.player_pull_rope = SDL_SCANCODE_Q;
+    input_map.mute = SDL_SCANCODE_M;
+    input_map.pause = SDL_SCANCODE_ESCAPE;
+    input_map.quit = SDL_SCANCODE_Q;
+    input_map.goto_level = SDL_SCANCODE_G;
+    input_map.mouse_attach_rope_pull = SDL_BUTTON_LEFT;
+    input_map.mouse_attach_rope = SDL_BUTTON_RIGHT;
+}
+
+#ifdef LOAD_INPUTS
+struct Buffer {
+    size_t len;
+    char *data;
+};
+
+struct Buffer read_whole_file(char const *file_name) {
+    struct stat sb;
+    struct Buffer b = {};
+
+    if (stat (file_name, & sb) != 0) {
+        return b;
+    }
+
+    char *buffer = malloc(sb.st_size + 1);
+
+    FILE *f = fopen(file_name, "r");
+    size_t bytes_read = fread(buffer, sizeof (unsigned char), sb.st_size, f);
+    if (bytes_read != sb.st_size) {
+        fclose(f);
+        free(buffer);
+        return b;
+    }
+
+    fclose(f);
+
+    b.data = buffer;
+    b.len = bytes_read;
+    return b;
+}
+
+int load_controls(void) {
+    struct Buffer b = read_whole_file(CONTROLS_FNAME);
+
+    if (b.len != sizeof (struct InputMap_Ser)) {
+        return 0;
+    }
+
+    struct InputMap_Ser *im = (struct InputMap_Ser *)b.data;
+
+    if (im->id != INPUT_MAP_ID)
+        return 0;
+
+    if (im->ver != INPUT_MAP_VERSION)
+        return 0;
+
+    memcpy(&input_map, &im->input_map, sizeof(struct InputMap));
+    return 1;
+}
+
+void save_controls(void) {
+    FILE *f = fopen(CONTROLS_FNAME, "w");
+
+    struct InputMap_Ser im;
+    im.id = INPUT_MAP_ID;
+    im.ver = INPUT_MAP_VERSION;
+    im.input_map = input_map;
+
+    fwrite(&im, sizeof(unsigned char), sizeof(struct InputMap_Ser), f);
+    fclose(f);
+}
+#endif

build-android/src/controlscheme.h

@@ -0,0 +1,35 @@
+#include <SDL.h>
+
+#ifndef CRTL_H
+#define CRTL_H
+
+enum Game_Interaction {
+    PLAYER_UP,
+    PLAYER_DOWN,
+    PLAYER_RIGHT,
+    PLAYER_LEFT
+};
+
+
+struct InputMap { 
+    SDL_Scancode player_up;
+    SDL_Scancode player_down;
+    SDL_Scancode player_left;
+    SDL_Scancode player_right;
+    SDL_Scancode player_rope;
+    SDL_Scancode player_pull_rope;
+    SDL_Scancode mute;
+    SDL_Scancode quit;
+    SDL_Scancode pause;
+    SDL_Scancode goto_level;
+    Uint8 mouse_attach_rope_pull;
+    Uint8 mouse_attach_rope;
+};
+
+extern struct InputMap input_map;
+
+void get_input_map(void); 
+void save_controls(void); 
+
+#endif
+

build-android/src/datatypes.c

@@ -0,0 +1,159 @@
+#include "datatypes.h"
+#include <string.h>
+#include <stdlib.h>
+
+ArrayList new_arlst(int num_elems) {
+    ArrayList new_list;
+    new_list.free = NULL;
+    new_list.size = 0;
+    new_list.capacity = num_elems;
+    new_list.items = calloc(num_elems, sizeof(void *));
+
+    return new_list;
+}
+
+ArrayList new_arlst_wfree(int num_elems, void (*nfree)(void *ptr)) {
+    ArrayList new_list = new_arlst(num_elems);
+    new_list.free = nfree;
+    return new_list;
+}
+
+ArrayList new_arlst_using_array(void **array, int length) {
+    ArrayList l = new_arlst(length);
+    free(l.items);
+    l.items = array;
+    return l;
+}
+
+ArrayList new_arlst_using_array_wfree(void **array, int length, 
+        void (*f)(void *)) {
+    ArrayList l = new_arlst_using_array(array, length);
+    l.free = f;
+    return l;
+}
+
+ArrayList new_arlst_from_array(void *array, size_t elem_size, int length) {
+    ArrayList l = new_arlst(length);
+    l.free = free;
+
+    for (int i = 0; i < length; i++) {
+        void *item = calloc(1, elem_size);
+        void *start = array + i * elem_size;
+        memmove(item, start, elem_size);
+        arlst_add(&l, item);
+    }
+    return l;
+}
+
+void *arlst_get(ArrayList *l, int id) {
+    // out of bounds
+    if (id < 0 || id >= l->size) {
+        return 0;
+    }
+
+    return l->items[id];
+}
+
+void * arlst_del(ArrayList *l, int id) {
+    void *item = arlst_get(l, id);
+
+    if (!item) {
+        return NULL;
+    }
+
+    l->size--;
+    // move elements backward
+    for (int i = id; i < l->size; i++) {
+        l->items[i] = l->items[i+1];
+    }
+
+
+    // shrink capacity if neccessary
+    if (D_SHRINK_THRESHOLD != 0 
+            || l->size < (100 / D_SHRINK_THRESHOLD) * l->capacity) {
+
+        size_t new_size = l-> size + (l->capacity * (100 / D_SHRINK_THRESHOLD) * 
+                100 / D_GROW_AMOUNT);
+
+//        l->items = reallocarray(l->items, new_size, sizeof(void *));
+        l->items = realloc(l->items,  new_size * sizeof(void *));
+    }
+
+    return item;
+}
+
+int arlst_add(ArrayList *l, void *item) {
+    int item_index = l->size;
+
+    // grow if neccessary
+    if (l->size == l->capacity) {
+        size_t new_size = l->capacity + (100 / D_GROW_AMOUNT) * l->capacity;
+        l->capacity = new_size;
+        //l->items = (void **)reallocarray(l->items, new_size, sizeof(void *));
+        l->items = (void **)realloc(l->items, new_size * sizeof(void *));
+    }
+
+    l->items[item_index] = item;
+    l->size++;
+
+    return 0;
+}
+
+void * arlst_pop(ArrayList *l) {
+    l->size--;
+    return l->items[l->size];
+}
+
+int arlst_push(ArrayList *l, void *item) {
+    return arlst_add(l, item);
+}
+
+int arlst_destroy(ArrayList *l) {
+    if (l->free != NULL) {
+        for (int i = 0; i < l->size; i++) {
+            l->free(l->items[i]);
+        }
+    }
+    free(l->items);
+    return 0;
+}
+
+
+ListFiFo new_fifo(int start_size) {
+    ListFiFo l;
+    memset(&l, 0, sizeof(ListFiFo));
+    l.inner = new_arlst(start_size);
+    l.size = &l.inner.size;
+    return l;
+}
+
+void *fifo_get(ListFiFo *l) {
+    if (l->fifo_head >= l->inner.size) {
+        return NULL;
+    }
+
+    void *value = arlst_get(&l->inner, l->fifo_head);
+
+    if (value != NULL) {
+        l->fifo_head++;
+    }
+
+    if (l->fifo_head == l->inner.capacity
+            || (l->fifo_head == l->inner.size 
+            && l->inner.size >= D_MAX_QUEUE_LEN)) {
+        // start rewriting from the beginning
+        l->inner.size = 0;
+        l->fifo_head = 0;
+        // memset(l->inner.items, 0, sizeof(void *) * l->inner.capacity);
+    }
+    return value;
+}
+
+/* It is up to the caller to free any data stored */
+int fifo_add(ListFiFo *l, void *i) {
+    if (l->inner.size >= D_MAX_QUEUE_LEN) {
+        return -1;
+    }
+    return arlst_add(&l->inner, i);
+}
+

build-android/src/datatypes.h

@@ -0,0 +1,61 @@
+#ifndef DTYPE_H
+#define DTYPE_H
+
+#include <stdlib.h>
+
+enum {
+    D_SHRINK_THRESHOLD = 50,    // percentage of capacity
+    // 0 = never shrink
+    // 100 = always shrink
+    D_GROW_AMOUNT = 50,          // percentage of size
+    // 0 = 1 = grow by 1 on every add
+    // 100 = double size whenever space runs out
+    D_MAX_QUEUE_LEN = 400        // maximum num of items allowed in a fifo
+};
+
+struct array_list {
+    size_t size;
+    size_t capacity;
+
+    void **items;
+    void (*free)(void *ptr); // free function
+};
+
+struct list_fifo {
+    struct array_list inner;
+    size_t fifo_head;
+    size_t *size;
+};
+
+typedef struct array_list ArrayList;
+typedef struct list_fifo ListFiFo;
+
+/* FIFOs */
+
+ListFiFo new_fifo(int start_size); 
+int fifo_add(ListFiFo *l, void *i); 
+void *fifo_get(ListFiFo *l); 
+
+/* Stacks */
+
+int arlst_push(ArrayList *l, void *item); 
+void * arlst_pop(ArrayList *l); 
+
+/* Array Lists */
+
+// constructors 
+ArrayList new_arlst_from_array(void *array, size_t elem_size, int length);
+ArrayList new_arlst_using_array_wfree(void **, int, void (*)(void *)); 
+ArrayList new_arlst_using_array(void **array, int length); 
+ArrayList new_arlst_wfree(int num_elems, void (*nfree)(void *ptr)); 
+ArrayList new_arlst(int num_elems); 
+
+// destructors
+int arlst_destroy(ArrayList *l); 
+void * arlst_del(ArrayList *l, int id);
+
+// functions
+int arlst_add(ArrayList *l, void *item); 
+void *arlst_get(ArrayList *l, int id);
+
+#endif

build-android/src/debuginfo.h

@@ -0,0 +1,2 @@
+
+#define SHOWCOLLISIONBOX 1

build-android/src/draw.c

@@ -0,0 +1,881 @@
+#include "draw.h"
+#include "game.h"
+#include "types.h"
+#include <SDL_mutex.h>
+#include <SDL_render.h>
+#include <time.h>
+
+Vect viewport_pos;
+int width, height;
+
+bool high_contrast_mode = 0;
+
+/* generic rendering functions */
+int MAX_ONSCREEN_OBJECTS = 99;
+
+int num_onscreen = 0;
+
+double time_delta = 0;
+
+void render_texture_at(struct SDL_Renderer * ren, struct SDL_Texture * texture,int x, int y) {
+    /* draw a texture at x.y */
+
+    SDL_Rect destination;
+    destination.x = x;
+    destination.y = y;
+
+    SDL_QueryTexture(texture, NULL, NULL, &destination.w, &destination.h);
+
+    SDL_RenderCopy(ren, texture, NULL, &destination);
+}
+
+/*SDL_Texture * load_image(SDL_Renderer * ren, char fname[]) {*/
+    /*[> Load an image into a texture <]*/
+
+    /*SDL_Surface * surface = IMG_Load(fname) ;*/
+    /*if(!surface) {*/
+        /*printf("IMG_Load: %s\n", IMG_GetError());*/
+        /*// handle error*/
+    /*}*/
+    
+    /*SDL_Texture * png_image = SDL_CreateTextureFromSurface(ren, surface);*/
+    /*cleanup(surface, SURFACE);*/
+    /*return (png_image);*/
+/*}*/
+
+
+double sigmoid(double x) {
+    return exp(x) / (exp(x) + 1);
+}
+
+struct timespec get_now_d() {
+    struct timespec now;
+    clock_gettime(CLOCK_MONOTONIC, &now);
+    if (now.tv_nsec >= 1000000000) {
+        now.tv_nsec -= 1000000000;
+    }
+    return now;
+}
+
+Vect in_view(Vect V) {
+    Vect ret;
+    ret.x = V.x -viewport_pos.x;
+    ret.y = V.y -viewport_pos.y;
+    return ret;
+}
+
+/* Game Specific rendering functions */
+void draw_player(SDL_Renderer * ren, int x, int y, bool red) {
+    // translate to viewport
+
+    Vect V;
+    V.x = x; V.y = y;
+    V = in_view(V);
+
+    /* draw the player as a coloured rect */
+    SDL_Rect player_rect;
+
+    player_rect.x = V.x -10; 
+    player_rect.y = V.y -10; 
+
+    player_rect.w = 20;
+    player_rect.h = 20;
+
+    struct colour c = get_scene_watch()->colours.bg;
+
+    SDL_SetRenderDrawColor(ren, c.r, c.g, c.b, 255);
+
+    SDL_RenderDrawRect(ren, &player_rect);
+    SDL_RenderFillRect(ren, &player_rect);
+    // draw strings
+    for (int i = 0; i < player.physics->num_strings; i++) {
+        if (!player.physics->strings[i].attached) {
+            continue;
+        }
+        Vect B = {x, y};
+        B = in_view(B);
+        Vect E;
+        E = in_view(player.physics->strings[i].end_point);
+        SDL_RenderDrawLine(ren, B.x, B.y, E.x, E.y);
+    }
+
+
+    SDL_SetRenderDrawColor(ren, 0,0,0, 255);
+
+}
+
+void draw_floor(SDL_Renderer *ren, FloorPoly *poly, bool down) {
+    SDL_Point left;
+    SDL_Point right;
+    left.x = poly->left.x - viewport_pos.x;
+
+    if (left.x > width) {
+        return;
+    }
+
+    right.x = poly->right.x - viewport_pos.x;
+    if (right.x < 0) {
+        return;
+    }
+
+    left.y = poly->left.y - viewport_pos.y;
+    right.y = poly->right.y - viewport_pos.y;
+
+    if (left.y <= 0 && right.y <= 0) {
+        return;
+    }
+    if (left.y >= height && right.y >= height) {
+        return;
+    }
+
+    SDL_SetRenderDrawColor(ren, 100,100,100, 255);
+
+    int end = down ? height : 0;
+
+    double m = (double)(right.y - left.y) / (double)(right.x - left.x);
+    double c = (double)left.y - ((double)left.x * m);
+
+    for (int i = left.x; i <= right.x; i++) {
+        int y = (int)(m * i + c);
+        if (y > 0) {
+            SDL_RenderDrawLine(ren, i, y, i, end);
+        }
+    }
+
+    SDL_SetRenderDrawColor(ren, 0,0,0, 255);
+}
+
+// draw collision poly
+void draw_collision_poly(SDL_Renderer* ren, Body *body) {
+    if (!SHOWCOLLISION) {
+        return;
+    }
+
+    if (body->colliding) {
+        SDL_SetRenderDrawColor(ren, 255, 0, 0, 255);
+    } else {
+        SDL_SetRenderDrawColor(ren, 0, 255, 0, 255);
+    }
+
+    // draw strings
+    for (int i = 0; i < body->num_strings; i++) {
+        if (!body->strings[i].attached) {
+            continue;
+        }
+        Vect B;
+        B = in_view(body->position);
+        Vect E;
+        E = in_view(body->strings[i].end_point);
+        SDL_RenderDrawLine(ren, B.x, B.y, E.x, E.y);
+    }
+
+    if (body->collision_poly_size == 1) {
+        SDL_Rect dot;
+        Vect V;
+        V.x = body->collision_poly[0].x;
+        V.y = body->collision_poly[0].y;
+        Vect T = in_view(V);
+        dot.x = T.x;
+        dot.y = T.y;
+        dot.w = 4;
+        dot.h = 4;
+        SDL_RenderDrawRect(ren, &dot);
+        SDL_RenderFillRect(ren, &dot);
+    } else if (body->collision_poly_size == 2) {
+        int x_st = body->collision_poly[0].x -viewport_pos.x;
+        int y_st = body->collision_poly[0].y -viewport_pos.y;
+        int x_en = body->collision_poly[1].x -viewport_pos.x;
+        int y_en = body->collision_poly[1].y -viewport_pos.y;
+        SDL_RenderDrawLine(ren, x_st, y_st, x_en, y_en);
+    } else if (body->collision_poly_size > 2) {
+        int x_st = body->collision_poly[0].x -viewport_pos.x;
+        int y_st = body->collision_poly[0].y -viewport_pos.y;
+        int x_en, y_en;
+        for (int i = 1; i < body->collision_poly_size; i++) {
+            x_en = body->collision_poly[i].x -viewport_pos.x;
+            y_en = body->collision_poly[i].y -viewport_pos.y;
+            SDL_RenderDrawLine(ren, x_st, y_st, x_en, y_en);
+            x_st = x_en;
+            y_st = y_en;
+        }
+        x_en = body->collision_poly[0].x-viewport_pos.x;
+        y_en = body->collision_poly[0].y-viewport_pos.y;
+        SDL_RenderDrawLine(ren, x_st, y_st, x_en, y_en);
+    }
+    SDL_SetRenderDrawColor(ren, 0,0,0, 255);
+}
+
+// draw indicator of forces acting on an object
+void draw_forces(SDL_Renderer *ren, Body *body) {
+    if (!SHOWFORCES) {
+        return;
+    }
+    Vect start;
+    start.x = (int)body->position.x -viewport_pos.x;
+    start.y = (int)body->position.y -viewport_pos.y;
+
+    Vect F;
+    for (int i = 0; i < body->num_motors; i++) {
+        if (!get_motor_active(body, i)) {
+            continue;
+        }
+        F.x += body->motors[i].x;
+        F.y += body->motors[i].y;
+        Vect end = vect_add(start, F);
+        SDL_SetRenderDrawColor(ren, 255,0,0, 255);
+        SDL_RenderDrawLine(ren, start.x, start.y, start.x, end.y);
+        SDL_SetRenderDrawColor(ren, 0,0,255, 255);
+        SDL_RenderDrawLine(ren, start.x, start.y, end.x, start.y);
+    }
+
+    SDL_SetRenderDrawColor(ren, 0,0,0, 255);
+}
+
+void draw_wall(SDL_Renderer *ren, Wall *wall) {
+    SDL_SetRenderDrawColor(ren, 120, 85, 188, 255);
+    int x_st, x_en, y_st, y_en;
+    x_st = wall->nodes[0].x + wall->physics->position.x -viewport_pos.x;
+    y_st = wall->nodes[0].y + wall->physics->position.y -viewport_pos.y;
+    for (int i = 1; i < wall->numNodes; i++) {
+         x_en = wall->nodes[i].x + wall->physics->position.x -viewport_pos.x;
+         y_en = wall->nodes[i].y + wall->physics->position.y -viewport_pos.y;
+         SDL_RenderDrawLine(ren, x_st, y_st, x_en, y_en);
+         x_st = x_en;
+         y_st = y_en;
+    }
+     x_en = wall->nodes[0].x + wall->physics->position.x -viewport_pos.x;
+     y_en = wall->nodes[0].y + wall->physics->position.y -viewport_pos.y;
+     SDL_RenderDrawLine(ren, x_st, y_st, x_en, y_en);
+
+     SDL_SetRenderDrawColor(ren, 0,0,0, 255);
+}
+
+int distance_colour(int x, int y, int x2, int y2, int blackpoint) {
+
+    int dist = (int) sqrt((x2 - x)*(x2 - x)  + (y2 - y)*(y2 - y) );
+
+    if (dist == 0) {
+        return 255;
+    }
+	if (dist > blackpoint) {
+		return 0;
+	}
+
+    int frac = blackpoint / dist;
+
+//    int frac = 255 * (int) sin((double)dist / blackpoint);
+    if (frac > 255) {
+        return 255;
+    }
+    
+    return frac;
+}
+
+void new_update_viewport(Body const * const pl) {
+    int const xmargin = 100; // pixels
+    int const ymargin = 100; // pixels
+    int const xmovmagin = width / 4;
+    int const ymovmagin = height / 3;
+    double const xrange = width - (2 * xmargin);
+    double const yrange = height - (2 * ymargin);
+    double const x_max = 2;
+    double const y_max = 3;
+    static Vect target = {};
+    static double dirchange = 0;
+    static Vect last_plpos = {};
+    if (last_plpos.x == 0 && last_plpos.y == 0)
+        last_plpos = pl->position;
+
+    static Vect lmove = {};
+
+    Vect iv = in_view(pl->position);
+
+    Vect left_pos = {0, 2 * height / 4};
+    left_pos = vect_add(pl->position, vect_scalar(left_pos, -1));
+
+    Vect right_pos = {7 * (width / 8), 2 * height / 4};
+    right_pos = vect_add(pl->position, vect_scalar(right_pos, -1));
+
+    bool recover = false;
+
+    Vect screen_dist = vect_add(in_view(pl->position), vect_scalar(lmove, -1));
+
+    static double swap = 0;
+    if (iv.x > width 
+        || (iv.x < 0
+            || iv.y > height
+            || iv.y < 0)) 
+        recover = true;
+
+    Vect delta = vect_add(vect_scalar(pl->position, -1), last_plpos);
+    double dist_change = vect_mag(delta);
+    if ((recover) //|| vect_mag((Vect){pl->vel.x, 0}) > 0.4 
+            || (dist_change > width / 100)) {
+        if (iv.x < width / 6) {
+            target = right_pos;
+        } else {
+            target = left_pos;
+        }
+        lmove = target;
+
+        last_plpos = pl->position;
+    }
+
+    if (recover)
+        viewport_pos = target;
+    // emergency
+
+    /*if (!(iv.x > width / 3 && iv.x < (2 * (width / 3)))) {*/
+        /*if (!(iv.y > height / 3 && iv.y < (2 * (height / 3)))) {*/
+
+            /*if (   true ||*/
+                   /*( in_view(pl->position).x > xmargin + xrange */
+                   /*|| in_view(pl->position).x < xmargin)*/
+                /*) */
+
+            /*{*/
+
+
+                /*double m =  (width / 2) / (2.0 * x_max);*/
+                /*double x = m * v;*/
+                /*target.x = pl->position.x - x;*/
+
+
+            /*}*/
+
+    //target.y = pl->position.y - height/2; // + y;
+
+        /*}*/
+    /*}*/
+
+    double v = pl->vel.x;
+    if (v > x_max) 
+        v = x_max;
+    if (v < -x_max) 
+        v = -x_max;
+    if (v < 0)
+        v = -v;
+
+    // move towards target a set proportion
+    Vect urgency = vect_add(target, vect_scalar(pl->position, -1));
+    Vect p = vect_add(target, vect_scalar(viewport_pos, -1));
+
+    double proportion = (sigmoid(time_delta) / 100);
+    proportion = 2 * (pl->vel.x * pl->vel.x / (width));
+    proportion = proportion < 0 ? -proportion : proportion;
+
+    proportion > 0.4 ? proportion = 0.4 : 0;
+    proportion < 0 ? proportion = 0.000001 : 0;
+
+    p = vect_scalar(p, proportion);
+    viewport_pos = vect_add(viewport_pos, p);
+
+
+}
+
+void update_viewport(Body *pl) {
+    float xmargin = 0.5;
+    float ymargin = 0.2;
+
+    if (pl->position.x - viewport_pos.x > (1-xmargin) * width) {
+        viewport_pos.x =  - ((1-xmargin) * width - pl->position.x);
+    }
+
+    if (pl->position.x - viewport_pos.x < xmargin * width) {
+        viewport_pos.x =  -(xmargin * width - pl->position.x);
+    }
+
+    if (pl->position.y - viewport_pos.y > (1-ymargin) * height) {
+        viewport_pos.y =  -((1-ymargin) * height - pl->position.y);
+    }
+
+    if (pl->position.y - viewport_pos.y < ymargin * height) {
+        viewport_pos.y =  -(ymargin * height - pl->position.y);
+    }
+}
+
+void accel_update_viewport(Body *pl) {
+    const double accel = 0.0001;
+    const float xmargin = 0.5;
+    const float ymargin = 0.2;
+
+    static Vect target_pos = (Vect) {.x=0, .y=0};
+    static Vect vel = (Vect) {.x=0.0, .y=0.0};
+
+
+    if (pl->position.x - viewport_pos.x > (1-xmargin) * width) {
+        target_pos.x =  - ((1-xmargin) * width - pl->position.x);
+    } 
+
+    if (pl->position.x - target_pos.x < xmargin * width) {
+        target_pos.x =  -(xmargin * width - pl->position.x);
+    }
+
+    if (pl->position.y - target_pos.y > (1-ymargin) * height) {
+        target_pos.y =  -((1-ymargin) * height - pl->position.y);
+    } 
+
+    if (pl->position.y - target_pos.y < ymargin * height) {
+        target_pos.y =  -(ymargin * height - pl->position.y);
+    }
+
+    viewport_pos = target_pos;
+    return;
+
+    Vect delta = vect_add(target_pos, vect_scalar(viewport_pos, -1));
+    printf("d %f %f\n", delta.x, delta.y);
+    printf("d %f\n", vect_mag(delta));
+
+    if ((vect_mag(delta) < 0.001 )) {
+        return;
+    }
+
+    Vect dir = vect_scalar(delta, 1/vect_mag(delta));
+    Vect vel_delta = vect_scalar(dir, accel * time_delta);
+    vel = vect_add(vel, vel_delta);
+
+    Vect pos_delta = vect_scalar(vel, time_delta/2);
+
+    viewport_pos = vect_add(viewport_pos, pos_delta);
+}
+
+double interpolate_h(Vect left, Vect right, double x) {
+    static Vect v;
+
+    double m = (double)(right.y - left.y) / (double)(right.x - left.x); 
+    double c = (double)left.y - ((double)left.x * m); 
+
+    return x * m + c;
+}
+
+void draw_environment(SDL_Renderer * ren, const struct environment *scene) {
+    struct colour c1 = scene->colours.bg;
+    struct colour c2 = scene->colours.fg1;
+    struct colour c3 = scene->colours.fg2;
+    struct colour c4 = scene->colours.fg3;
+
+    /*c1->r = 255;*/
+    /*c2->g = 255;*/
+    /*c3->b = 255;*/
+    /*c4->g = 255;*/
+    /*c4->b = 255;*/
+
+    // background colour
+    SDL_SetRenderDrawColor(ren, c1.r, c1.g, c1.b, 255);
+    /*SDL_SetRenderDrawColor(ren, 255, 0, 0, 255);*/
+
+    SDL_Rect rect; 
+    rect.x = 0;
+    rect.y = 0;
+    rect.w = width;
+    rect.h = height;
+    SDL_RenderFillRect(ren, &rect);
+
+/*
+ *    double m = (double)(right.y - left.y) / (double)(right.x - left.x);
+ *    double c = (double)left.y - ((double)left.x * m);
+ *
+ *    for (int i = left.x; i <= right.x; i++) {
+ *        int y = (int)(m * i + c);
+ *        if (y > 0) {
+ *            SDL_RenderDrawLine(ren, i, y, i, end);
+ *        }
+ *    }
+ */
+
+    int k = 0;
+//    printf("from 0 to (room tiles) %d - 1, res %d width %d\n", E_ROOM_TILES, E_ROOM_RES, E_ROOM_WIDTH);
+    for (int i = 0; i < E_ROOM_TILES - 1; i++) {
+        for (int j = 0; j < E_ROOM_RES; j++) {
+            k++;
+            Vect *left;
+            Vect *right;
+
+            int x = (i * E_ROOM_RES) + j;
+            if (x - viewport_pos.x > width) {
+                break;
+            }
+            if (x - viewport_pos.x < 0) {
+                continue;
+            }
+
+            left = arlst_get(&scene->ceil, i);
+            right = arlst_get(&scene->ceil, i+1);
+
+            int y0 = interpolate_h(*left, *right, x) - viewport_pos.y;
+
+            left = arlst_get(&scene->bg1, i);
+            right = arlst_get(&scene->bg1, i+1);
+
+            int y1 = interpolate_h(*left, *right, x) - viewport_pos.y;
+
+            left = arlst_get(&scene->bg2, i);
+            right = arlst_get(&scene->bg2, i+1);
+
+            int y2 = interpolate_h(*left, *right, x) - viewport_pos.y;
+
+            left = arlst_get(&scene->floor, i);
+            right = arlst_get(&scene->floor, i+1);
+
+            int y3 = interpolate_h(*left, *right, x) - viewport_pos.y;
+
+            x = x - viewport_pos.x;
+            /*printf("x: %d, ", x);*/
+            /*printf("y: %d %d %d %d\n", y0, y1, y2, y3);*/
+
+            // 3. bg2 to floor
+            SDL_SetRenderDrawColor(ren, c4.r, c4.g, c4.b, 255);
+            SDL_RenderDrawLine(ren, x, y2, x, y3);
+            
+            // 1. ceil to bg1
+            SDL_SetRenderDrawColor(ren, c2.r, c2.g, c2.b, 255);
+            SDL_RenderDrawLine(ren, x, y0, x, y1);
+
+            // 2. bg1 to bg2
+            SDL_SetRenderDrawColor(ren, c3.r, c3.g, c3.b, 255);
+            SDL_RenderDrawLine(ren, x, y1, x, y2);
+             
+
+
+        }
+    }
+}
+
+
+void draw_text(SDL_Renderer *rend, Vect pos, struct colour colour, char *text) {
+    static SDL_Renderer *ren = NULL;
+    static TTF_Font* font = NULL;
+    if (!font) {
+        font = TTF_OpenFont("res/TerminusTTF.ttf", 44);
+        const char *err = SDL_GetError();
+        if (err) {
+            printf("%s\n", err);
+        }
+    }
+    if (!ren) {
+        ren = rend;
+    }
+
+    SDL_Colour sdl_col = {colour.r, colour.g, colour.b, 255}; 
+    SDL_Rect position = {.x = pos.x, .y = pos.y};
+
+    SDL_SetRenderDrawColor(ren, colour.r, colour.g, colour.b, 255);
+    SDL_Surface *surf =  TTF_RenderText_Solid(font, text, sdl_col);
+
+    SDL_Texture *texture = SDL_CreateTextureFromSurface(ren, surf);
+    SDL_QueryTexture(texture, NULL, NULL, &position.w, &position.h);
+    SDL_RenderCopy(ren, texture, NULL, &position);
+
+    SDL_DestroyTexture(texture);
+    SDL_FreeSurface(surf);
+
+}
+
+
+void draw_level_chooser_tbox(SDL_Renderer *ren) {
+
+    char string[250];
+    snprintf(string, 250,"GOTO LEVEL: %s", gameui.currently_bound_textbox->text_input);
+
+    const struct environment *scene = get_scene_watch();
+
+    Vect pos = {.x= width - (width / 4), .y = height - (height / 10)};
+    draw_text(ren, pos, scene->colours.fg1, string);
+}
+
+
+int draw_end_screen(SDL_Renderer *ren) {
+    const struct environment *scene = get_scene_watch();
+
+    struct colour bg = scene->colours.bg;
+    struct colour colour = scene->colours.fg1;
+    struct colour_pallete pal = scene->colours;
+
+    SDL_SetRenderDrawColor(ren, bg.r, bg.g, bg.b,255);
+
+    SDL_RenderClear(ren);
+
+
+    SDL_SetRenderDrawColor(ren, pal.fg2.r, pal.fg2.g, pal.fg2.b,255);
+    for (int i = width - 300; i < width; i++) {
+        SDL_RenderDrawLine(ren, i, height, width, height - i);
+        if (!(i % 240)) {
+            SDL_SetRenderDrawColor(ren, pal.fg3.r, pal.fg3.g, pal.fg3.b,255);
+        }
+        if (!(i % 350)) {
+            SDL_SetRenderDrawColor(ren, pal.fg1.r, pal.fg1.g, pal.fg1.b,255);
+        }
+    }
+
+
+    int margin = height / 10;
+  //  Vect position = {.x = width - width / 10, .y = height - margin};
+
+    long fastest = draw_watch.best_time;
+
+    int minutes = level_time / 60000;
+    float seconds = level_time * 0.001;
+    char time_string[250];
+
+
+    char * end_str = "level over.";
+
+    Vect position  = {.x = width/4, .y = height / 4};
+    draw_text(ren, position, colour, end_str);
+    position.y += 60;
+
+    char level_string[250];
+    snprintf(level_string, 250,"course: %d", level);
+    draw_text(ren, position, colour, level_string);
+    position.y += 40;
+
+    char fastest_time[250];
+    minutes = fastest / 60000;
+    seconds = fastest * 0.001;
+    if (fastest > 0) {
+        snprintf(fastest_time, 250, "old best time: %d:%.4f", minutes, seconds);
+        draw_text(ren, position, colour, fastest_time);
+        position.y += 40;
+    }
+
+    /*
+    char qual_str[250];
+    snprintf(qual_str, 250, "physics quality: %d", quality);
+    draw_text(ren, position, colour, qual_str);
+    position.y += 40;
+    */
+
+
+    minutes = level_time / 60000;
+    seconds = level_time * 0.001;
+    if (level_time > fastest) {
+        // base time not set yet.
+        snprintf(time_string, 250, "TIME: %d:%.4f", minutes, seconds);
+    } else {
+        snprintf(time_string, 250, "NEW BEST TIME: %d:%.4f", minutes, seconds);
+    }
+
+    Vect position2  = {.x = position.x + width/3, .y = 60 + height / 4};
+
+    if (fastest > 0) {
+        //position.y += 40;
+        long diff = level_time - fastest;
+        char diff_str[250];
+        minutes = diff / 60000;
+        seconds = diff * 0.001;
+        if (minutes > 0) {
+            snprintf(diff_str, 250, "DIFF: %d:%.4f", minutes, fabs(seconds));
+        } else {
+            snprintf(diff_str, 250, "DIFF: %.4f s", seconds);
+        }
+
+        draw_text(ren, position2, colour, diff_str);
+        position2.y += 40;
+    }
+
+    draw_text(ren, position2, colour, time_string);
+
+    position.y += 200;
+    char * ct_str = "press any key to continue";
+    draw_text(ren, position, colour, ct_str);
+
+    SDL_RenderPresent(ren);
+    return 0;
+}
+
+
+void draw_level_time(SDL_Renderer *ren, const struct environment * e) {
+    
+    int margin = height / 10;
+
+    struct colour colour = e->colours.fg1;
+
+    int minutes = level_time / 60000;
+    float seconds = level_time * 0.001;
+    char time_string[250];
+    snprintf(time_string, 250, "time: %d:%.4f", minutes, seconds);
+
+    char level_string[250];
+    snprintf(level_string, 250,"course: %d", level);
+
+    Vect position = {.x = margin, .y = height - margin};
+    draw_text(ren, position, colour, level_string);
+    position.y += 40;
+    draw_text(ren, position, colour, time_string);
+
+}
+
+void draw_pause_screen(SDL_Renderer *ren, struct environment *e) {
+
+    char *te[] = {  "GAME PAUSED.",
+                    "controls",
+                    "________",
+                    "pause/unpause:      esc",
+                    "grapple:            right click",
+                    "grapple and pull:   left click",
+                    "go to level:        g",
+                    "mute/unmute:        m",
+                    "quit:               q"
+                    };
+
+    struct colour textc = e->colours.fg1;
+    struct colour bg = e->colours.bg;
+
+    SDL_SetRenderDrawColor(ren, bg.r, bg.g, bg.b, 255);
+    int boxwidth = 360;
+    int boxheight = 348;
+    int box_x = (2 * width / 3) - (boxwidth / 2);
+    int box_y = (height - boxheight) / 2;
+    SDL_Rect r = {.w = boxwidth, .h = boxheight, .x = box_x, .y = box_y};
+    SDL_RenderFillRect(ren, &r);
+
+    Vect p = {.x = box_x + 10, .y = box_y + 10};
+    draw_text(ren, p, textc, te[0]);
+    p.y += 60;
+
+    draw_text(ren, p, textc, te[1]);
+    p.y += 5;
+    draw_text(ren, p, textc, te[2]);
+    p.y += 35;
+
+    draw_text(ren, p, textc, te[3]);
+    p.y += 40;
+
+    draw_text(ren, p, textc, te[4]);
+    p.y += 40;
+
+    draw_text(ren, p, textc, te[5]);
+    p.y += 40;
+
+    draw_text(ren, p, textc, te[6]);
+    p.y += 40;
+
+    draw_text(ren, p, textc, te[7]);
+    p.y += 40;
+
+    draw_text(ren, p, textc, te[8]);
+    p.y += 40;
+
+}
+
+void redraw_buffer(SDL_Renderer * ren) {
+	static int mousex = 0;
+	static int mousey = 0;
+	static int newmousex = 0;	
+	static int newmousey = 0;
+    static SDL_Point *bgPixels[256];
+    static int numpixels[256];
+
+    /*if (!width && !height) {*/
+        /*for (int i = 0; i < 256; i++) {*/
+            /*bgPixels[i] = malloc(sizeof(SDL_Point) * width * height);*/
+            /*memset(bgPixels[i], 0, sizeof(SDL_Point) * width * height);*/
+            /*memset(numpixels, 0, (sizeof(int) * 256));*/
+        /*}*/
+    /*}*/
+
+    int col = 0;
+    Body lplayer;
+
+    if (SDL_LockMutex(player.physics->lock) == 0){
+        lplayer = *player.physics;
+        update_viewport(&lplayer);
+    } else {
+        return;
+    }
+
+    static struct timespec last = {};
+    static struct timespec now;
+    now = get_now_d();
+    time_delta = now.tv_nsec - last.tv_nsec;
+    time_delta *= 0.000001; // convert to ms from ns
+
+    last = now;
+
+	//SDL_GetMouseState(&newmousex, &newmousey);
+
+    const struct environment* scene = get_scene_watch();
+    draw_environment(ren, scene);
+    draw_level_time(ren, scene);
+    SDL_UnlockMutex(player.physics->lock);
+
+    for (int i=0; i < world.items.size; i++) {
+        world_thing thing;
+        thing = world.get(i);
+
+        switch (thing.kind) {
+            case STATIC_WALL_W:
+                draw_wall(ren, thing.wall);
+                draw_collision_poly(ren, thing.wall->physics);
+                continue;
+            case FLOOR:
+                for (int i = 0; i < thing.floor->numPolys; i++) {
+                    draw_floor(ren, &thing.floor->polys[i], true);
+                    draw_collision_poly(ren, thing.floor->polys[i].physics);
+                }
+                continue;
+            case CEILING:
+                for (int i = 0; i < thing.floor->numPolys; i++) {
+                    draw_floor(ren, &thing.floor->polys[i], false);
+                    draw_collision_poly(ren, thing.floor->polys[i].physics);
+                }
+                continue;
+            case ROOM_W:
+                for (int i = 0; i < thing.room->ceil.numItems; i++) {
+                    draw_collision_poly(ren, thing.room->ceil.items[i]);
+                }
+                for (int i = 0; i < thing.room->floor.numItems; i++) {
+                    draw_collision_poly(ren, thing.room->floor.items[i]);
+                }
+            default:
+                continue;
+        }
+    }
+
+    draw_player(ren, lplayer.position.x, lplayer.position.y, 
+            lplayer.colliding);
+    draw_collision_poly(ren, &lplayer);
+    draw_forces(ren, &lplayer);
+
+    if (gameui.currently_bound_textbox) {
+        draw_level_chooser_tbox(ren);
+    }
+
+    if (game_paused) {
+        SDL_Rect r = {.x = 0, .y = 0, .w = width, .h = height};
+        SDL_SetRenderDrawColor(ren, 0, 0, 0, 90);
+        SDL_RenderFillRect(ren, &r);
+        if (in_game)
+            draw_pause_screen(ren, scene);
+    }
+
+	/*if (newmousex != mousex || newmousey != mousey) {*/ /*mousey = newmousey;*/
+		/*mousex = newmousex;*/
+        /*for (int i = 0; i < 256; i++) {*/
+            /*memset(bgPixels[i], 0, sizeof(SDL_Point) * width * height);*/
+            /*memset(numpixels, 0, (sizeof(int) * 256));*/
+        /*}*/
+        /*for (int i=0; i < width; i++) {*/
+            /*for (int j = 0; j < height; j++) {*/
+                /*col = distance_colour(i, j, mousex, mousey, 10000);*/
+
+                /*SDL_Point *row = bgPixels[col];*/
+                /*SDL_Point point;*/
+                /*point.x = i;*/
+                /*point.y = j;*/
+                /*row[numpixels[col]] = point;*/
+                /*numpixels[col] += 1;*/
+
+            /*}*/
+        /*}*/
+	/*}*/
+
+    /*for (int i = 0; i < 255; i++) {*/
+        /*SDL_Point *row = bgPixels[i];*/
+        /*col = i;*/
+        /*SDL_SetRenderDrawColor(ren, col, col, col, 255);*/
+        /*SDL_RenderDrawPoints(ren, row, numpixels[i]);*/
+    /*}*/
+
+}
+

build-android/src/draw.h

@@ -0,0 +1,42 @@
+#ifndef _DEFDRAW
+#define _DEFDRAW
+
+#include <SDL.h>
+#include <SDL_ttf.h>
+
+#include "colours.h"
+#include "vect.h"
+#include "environment.h"
+#include "game.h" 
+
+#define SHOWCOLLISION 0
+#define SHOWFORCES 0
+
+typedef enum {
+    PLAYER
+} draw_type;
+
+void render_texture_at(struct SDL_Renderer * ren, struct SDL_Texture * texture,int x, int y) ;
+/* draw a texture at x.y */
+
+SDL_Texture * load_image(SDL_Renderer * ren, char fname[]); 
+/* Load an image into a texture */
+
+void draw_player(SDL_Renderer * ren, int x, int y, bool red); 
+/* draw the player as a coloured rect */
+
+//void queue_draw_item(void * object, draw_type kind); 
+void add_to_view(draw_type kind, void * object); 
+
+void redraw_buffer(SDL_Renderer * ren); 
+
+void draw_text(SDL_Renderer *ren, Vect pos, struct colour colour, char *text); 
+
+int draw_end_screen(SDL_Renderer *ren); 
+
+extern Vect viewport_pos;
+extern int width, height;
+extern bool high_contrast_mode;
+
+
+#endif

build-android/src/environment.c

@@ -0,0 +1,244 @@
+#include "environment.h"
+#include "game.h"
+#include "types.h"
+
+struct environment * environment_watch = NULL;
+
+const struct environment* get_scene_watch(void) {
+    return environment_watch;
+}
+
+double linear_interpolate(double a0, double a1, double w) {
+    return (1.0f - w) * a0 + w * a1;
+}
+
+int destroy_environment(struct environment *e) {
+    /*Vect position;*/
+    /*ArrayList ceil;  // doubles*/
+    /*ArrayList floor; // doubles*/
+    /*ArrayList bg1;   // doubles*/
+    /*ArrayList bg2;   // doubles*/
+    /*struct colour_pallete colours;*/
+    /*struct physics_collection physics;*/
+
+    arlst_destroy(&e->ceil);
+    arlst_destroy(&e->floor);
+    arlst_destroy(&e->bg1);
+    arlst_destroy(&e->bg2);
+
+    return 0;
+}
+
+double perlin(Vect coordinate) {
+    Vect a = coordinate;
+    Vect b = coordinate;
+    a.x = (int)a.x;
+    a.y = (int)a.y;
+    b.x = a.x + 1;
+    b.y = a.y + 1;
+
+    double sx = coordinate.x - a.x;
+    double sy = coordinate.y - a.y;
+
+    Vect d = b;
+    d.y = a.y;
+
+    double n0 = vect_dot(a, coordinate);
+    double n1 = vect_dot(d, coordinate);
+
+    double ix0 = linear_interpolate(n0, n1, sx);
+
+    Vect c;
+    c.x = a.x;
+    c.y = b.y;
+
+    n0 = vect_dot(c, coordinate);
+    n1 = vect_dot(b, coordinate);
+    double ix1 = linear_interpolate(n0, n1, sy);
+
+    return linear_interpolate(ix0, ix1, sy);
+}
+
+struct colour_pallete get_pallete_high_contrast(void) {
+    struct colour white = {.r = 255, .g=255,.b=255, .sp=CS_RGB};
+    struct colour black = {.r = 0, .g=0,.b=0, .sp=CS_RGB};
+    struct colour_pallete p = {.bg = black, .fg1 = white, .fg2 = white, .fg3 = white};
+    return p;
+}
+
+
+struct colour_pallete get_pallete (int seed) {
+    struct colour base;
+
+    if (high_contrast_mode) 
+        return get_pallete_high_contrast();
+
+    int n = seed;
+    int red = get_rand(&n) % 255;
+    int blue = get_rand(&n) % 255;
+    int green = get_rand(&n) % 255;
+
+    base.r = red;
+    base.g = green;
+    base.b = blue;
+
+    struct colour c1 = get_hsv(base);
+    c1 = get_hsv(base);
+    struct colour_pallete cols;
+
+    c1.l = 0.1;
+    cols.bg = get_rgb(c1);
+    c1.l += 0.3;
+
+    c1.h += 30;
+    cols.fg1 = get_rgb(c1);
+
+    c1.h += 30;
+    cols.fg2 = get_rgb(c1);
+
+    c1.h += 30;
+    cols.fg3 = get_rgb(c1);
+
+    return cols;
+
+    struct colour *adj = get_adjacent(base, 20, 4);
+    ArrayList l = new_arlst_wfree(4, free);
+
+    for (int i = 0; i < 4; i++) {
+        arlst_add(&l, adj + i);
+    }
+
+}
+
+int comp(const void *one, const void *two) {
+    return *(int*)one >= *(int*)two;
+}
+
+struct environment get_scene_at(Vect coordinate, int seed) {
+    // TODO: Environment needs to be shared between threads
+    //  - this implementation duplicates it: each thread that calls
+    //      get_scene_at gets manages its state in its own static vairables in
+    //      this function but share pointers to the malloced environment object-
+    //      it is thoroughly broken. 
+    //  - Fix by having a heap allocated environment object that the draw thread
+    //      (T0) can watch and the physics thread (T3) can modify 
+    //      - the entry point can either be through a function returning
+    //      a pointer or just a global const pointer
+    //      
+    // basic cache for the last room generated
+    static bool init;
+    static Vect last_room;
+    static struct environment e;
+    static int oldseed;
+    Vect room_coord;
+    room_coord.x = (int)coordinate.x - (int)coordinate.x % E_ROOM_WIDTH;
+    room_coord.y = 0;
+
+    if (init && room_coord.x == last_room.x && oldseed == seed) {
+        return e;
+    } else if (init) {
+        destroy_environment(&e);
+    }
+    last_room = room_coord;
+    oldseed = seed;
+
+    e.floor = new_arlst_wfree(E_ROOM_TILES, free);
+    e.ceil = new_arlst_wfree(E_ROOM_TILES, free);
+    e.bg1 = new_arlst_wfree(E_ROOM_TILES, free);
+    e.bg2 = new_arlst_wfree(E_ROOM_TILES, free);
+
+    e.colours = get_pallete(seed);
+
+    Vect bit;
+    bit.y = 100 * seed;
+    Vect pos;
+
+    int n = seed;
+    get_rand(&n);
+
+    Vect node;
+    node.y = 0;
+
+    for (int i = 0; i < E_ROOM_WIDTH; i += E_ROOM_RES) {
+        bit.x = room_coord.x + i;
+        bit.y = seed;
+        node.x = bit.x;
+
+        int r1 = 1.5*(get_rand(&n) % 500) - (get_rand(&n) % 100); 
+        int r2 = 1.5*(get_rand(&n) % 200) - (get_rand(&n) % 200);
+        int r3 = (get_rand(&n) % 100) - (get_rand(&n) % 500);
+        int r4 = 50;
+
+        int r[4] = {r1, r2, r3, r4};
+        qsort(r, 4, sizeof(int), comp);
+        // r[0] == ceiling
+        // r[3] == floor
+
+        //node.y += r[0];
+        int h[4] = {node.y,node.y,node.y,node.y};
+        h[0] += r[0];
+        h[1] = h[0] + r[1];
+        h[2] += h[0] + r[2];
+        h[3] += h[0] + r[3];
+        qsort(h, 4, sizeof(int), comp);
+
+//        node.y = fmod(perlin(bit),  3000);
+        Vect *z = malloc(sizeof(Vect));
+        *z = node;
+        z->y = h[0];
+
+        arlst_add(&e.floor, z);
+
+        z = malloc(sizeof(Vect));
+        *z = node;
+//        z->y += r[1];
+        z->y = h[1];
+        arlst_add(&e.bg1, z);
+
+        z = malloc(sizeof(Vect));
+        *z = node;
+        //z->y += r[2];
+        z->y = h[2];
+        arlst_add(&e.bg2, z);
+
+
+        z = malloc(sizeof(Vect));
+        *z = node;
+//        z->y += r[3];
+        z->y = h[3];
+        arlst_add(&e.ceil, z);
+
+    }
+
+    Vect *v = arlst_get(&e.floor, 0); 
+    Vect v2 = *(Vect *)arlst_get(&e.ceil, 0); 
+
+    Vect v3 = vect_add(v2, vect_scalar(vect_add(*v, vect_scalar(v2, -1)) , 0.5));
+
+    int d[] = {0, E_ROOM_TILES - 1};
+    int a;
+    for (int i = 0; i <= 1; i++) {
+        a = d[i];
+        v = arlst_get(&e.floor, a); 
+        v->y = v3.x;
+        v = arlst_get(&e.ceil, a); 
+        v->y = v3.x;
+        v = arlst_get(&e.bg1, a); 
+        v->y = v3.x;
+        v = arlst_get(&e.bg2, a); 
+        v->y = v3.x;
+    }
+
+    // join the end and start together
+
+    if (!init) {
+        struct environment *ee = malloc(sizeof(struct environment));
+        environment_watch  = ee;
+    }
+
+    *environment_watch = e;
+
+    init = true;
+
+    return e;
+}

build-android/src/environment.h

@@ -0,0 +1,12 @@
+#ifndef ENVIRO_H
+#define ENVIRO_H
+
+#include "vect.h"
+#include "types.h"
+
+struct environment get_scene_at(Vect coordinate, int seed); 
+int destroy_environment(struct environment *e);
+
+const struct environment *get_scene_watch(void);
+
+#endif

build-android/src/game.h

@@ -0,0 +1,82 @@
+#ifndef _DEFGAME
+#define _DEFGAME 
+
+#include "environment.h"
+#include "datatypes.h"
+#include "vect.h"
+#include "controlscheme.h"
+#include "colours.h"
+#include "types.h"
+#include "draw.h"
+
+extern GlobWorld world;
+extern int level;
+extern bool in_game;
+extern int quality;
+
+struct draw_watcher {
+    long best_time;
+    bool finish_level;
+};
+
+
+struct ui_state {
+    struct textbox_info *currently_bound_textbox;
+    int goto_new_level;
+};
+
+
+enum TextBoxId {
+    TB_LEVEL_CHOOSER = 0
+};
+
+struct textbox_info {
+    enum TextBoxId id;
+    bool capture_input_text_field;
+    char text_input[32];
+    int text_input_bufpos;
+    void (*close_callback)(struct textbox_info *textbox, void*callback);
+};
+
+extern struct draw_watcher draw_watch;
+extern struct textbox_info* texboxes;
+extern struct ui_state gameui;
+
+
+void handle_input_event(SDL_Event event);
+
+// add a motor to the world
+void add_motor(Body *thing, double x, double y); 
+
+bool get_motor_active(Body *thing, int i); 
+
+/* temporary storage variable *n should be initialised to the seed value */
+int get_rand(int *n); 
+
+void next_level(int lvl); 
+
+int step(void);
+
+struct sg_times_list {
+    long *times;
+    int size;
+    int capacity;
+    void (*sort)(void);
+    char *filename;
+};
+
+int load_score_times(char *filename); 
+
+
+/* array of all the things in the world and their kinds */
+
+extern struct sg_times_list save_times_lst;
+int add_time(long time); 
+int write_times(void); 
+extern void startgame(SDL_Renderer * ren) ;
+extern void process_keydown(SDL_Keysym key);
+extern void process_keyup(SDL_Keysym key);
+extern player_st player;
+extern long level_time;
+extern bool game_paused;
+#endif

build-android/src/main.c

@@ -0,0 +1,185 @@
+#include <SDL_mutex.h>
+#include <SDL_audio.h>
+#include <SDL_scancode.h>
+#include <SDL_mixer.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <SDL.h>
+#include <string.h>
+#include <time.h>
+#include <stdbool.h>
+#include <math.h>
+
+#include "audio.h" // only for mkdirat lol
+#include <fcntl.h> 
+#include <sys/stat.h>
+
+#include "game.h" 
+#include "draw.h" 
+#include "types.h"
+
+const int screen_width = 800;
+const int screen_height = 600;
+
+
+SDL_sem *resume;
+
+
+struct SDL_Window* make_window(void) {
+    if (SDL_Init(SDL_INIT_EVERYTHING) != 0) { 
+        printf("error initializing SDL: %s\n", SDL_GetError()); 
+    } 
+
+
+    return SDL_CreateWindow("space_game", 
+                                       SDL_WINDOWPOS_CENTERED, 
+                                       SDL_WINDOWPOS_CENTERED, 
+                                       0, 0, 
+                                       SDL_WINDOW_FULLSCREEN_DESKTOP); 
+}
+
+
+void redraw(struct SDL_Renderer * ren) {
+    SDL_RenderClear(ren);
+    redraw_buffer(ren);
+    SDL_RenderPresent(ren);
+}
+
+
+void godophysics(void) {
+    int lvl;
+    if ((lvl = step()))  {
+        // display end level screen
+        in_game = false;
+        game_paused = true;
+        SDL_Delay(300);
+        SDL_SemWait(resume);
+#ifdef SCORE_SYSTEM
+        add_time(level_time);
+#endif
+
+        SDL_LockMutex(player.physics->lock);
+        next_level(lvl);
+        in_game = true;
+        SDL_UnlockMutex(player.physics->lock);
+        game_paused = false;
+    }
+}
+
+int physics_loop(void *ptr) {
+    game_paused = 1;
+    while (1) {
+        godophysics();
+    }
+}
+
+
+
+int game(void) {
+    //SDL_SetHint( SDL_HINT_RENDER_SCALE_QUALITY, "2" );
+
+    SDL_Window * win = make_window();
+    SDL_Renderer * ren = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED);
+//            | SDL_RENDERER_PRESENTVSYNC);
+    SDL_SetRenderDrawBlendMode(ren, SDL_BLENDMODE_BLEND);
+
+
+    in_game = true;
+    resume = SDL_CreateSemaphore(0);
+
+  //  IMG_Init(IMG_INIT_PNG | IMG_INIT_JPG);
+
+    if (ren == NULL) {
+        SDL_DestroyWindow(win);
+        SDL_Quit();
+    }
+
+    TTF_Init();
+
+    int close = 0;
+
+    //draw_pictures(ren);
+    
+    SDL_Thread *physics_thread;
+    int ignore;
+
+    startgame(ren);
+
+    physics_thread = SDL_CreateThread(physics_loop, "physics", (void *)ren);
+
+    int count = 0;
+
+    while (!close)  {
+        SDL_Event event; 
+        while(SDL_PollEvent(&event))  {
+            switch (event.type) {
+                case SDL_QUIT:
+                    goto endfunc;
+                case SDL_KEYDOWN:
+                    if (event.key.keysym.scancode == SDL_SCANCODE_Q) {
+                        goto endfunc;
+                    }
+                    if (!in_game && !SDL_SemValue(resume)) {
+                        SDL_SemPost(resume);
+                    }
+                case SDL_KEYUP:
+                case SDL_MOUSEBUTTONDOWN:
+                    if (!in_game && !SDL_SemValue(resume)) {
+                        SDL_SemPost(resume);
+                        break;
+                    }
+                case SDL_MOUSEBUTTONUP:
+                    handle_input_event (event);
+            }
+        }
+
+        if (!in_game && draw_watch.finish_level) {
+            draw_end_screen(ren);
+        } else {
+            redraw(ren);
+        }
+    }
+
+endfunc:
+
+    SDL_DestroyRenderer(ren);
+    SDL_DestroyWindow(win);
+    return 0;
+}
+
+
+int main (int argc, char** argv)  {
+
+#ifdef __linux__
+    mkdirat(AT_FDCWD, "saves", 0777);
+#elif WIN32
+    if (access("saves", 0) == 0) {
+        struct stat status;
+        stat("saves", &status );
+        if ((status.st_mode & S_IFDIR) == 0) {
+            _mkdir("saves");
+        }
+    }
+#endif
+
+    game();
+
+    SDL_Quit();
+    return 0; 
+} 
+
+
+
+/*
+ * TODO: 
+ *  - Allow setting and saving/loading differnet control schemes
+ *  - Allow starting a specific level
+ *  - Allow adjusging level lengths?
+ *  - Ensure next_level doesn't leak memory
+ *  - fix that weird jitter
+ *  - make the end of level look sane
+ *  - restart level
+ *  - make sure goto level doesn't log an end-0f-level time
+ */
+

build-android/src/main.cpp

@@ -0,0 +1,61 @@
+#include <SDL.h>
+#include <stdio.h>
+
+int main(int /*argc*/, char* /*argv*/[]) {
+
+    SDL_Window *window;                    // Declare a pointer
+
+    SDL_Init(SDL_INIT_VIDEO);              // Initialize SDL2
+
+    // Create an application window with the following settings:
+    window = SDL_CreateWindow(
+        "An SDL2 window",                  // window title
+        SDL_WINDOWPOS_UNDEFINED,           // initial x position
+        SDL_WINDOWPOS_UNDEFINED,           // initial y position
+        640,                               // width, in pixels
+        480,                               // height, in pixels
+        SDL_WINDOW_OPENGL                  // flags - see below
+    );
+
+    // Check that the window was successfully created
+    if (window == NULL) {
+        // In the case that the window could not be made...
+        printf("Could not create window: %s\n", SDL_GetError());
+        return 1;
+    }
+
+    // The window is open: could enter program loop here (see SDL_PollEvent())
+    // Setup renderer
+    SDL_Renderer* renderer = NULL;
+    renderer =  SDL_CreateRenderer( window, -1, SDL_RENDERER_ACCELERATED);
+
+    // Set render color to red ( background will be rendered in this color )
+    SDL_SetRenderDrawColor( renderer, 255, 0, 0, 255 );
+
+    // Clear winow
+    SDL_RenderClear( renderer );
+
+    // bouyatest
+
+    // Creat a rect at pos ( 50, 50 ) that's 50 pixels wide and 50 pixels high.
+    SDL_Rect r;
+    r.x = 50;
+    r.y = 50;
+    r.w = 500;
+    r.h = 500;
+
+    // Set render color to blue ( rect will be rendered in this color )
+    SDL_SetRenderDrawColor( renderer, 0, 200, 255, 255 );
+
+    // Render the rect to the screen
+    SDL_RenderPresent(renderer);
+
+    SDL_Delay(1000);  // Pause execution for 3000 milliseconds, for example
+
+    // Close and destroy the window
+    SDL_DestroyWindow(window);
+
+    // Clean up
+    SDL_Quit();
+    return 0;
+}

build-android/src/physics.c

@@ -0,0 +1,2 @@
+#include "physics.h"
+#include "types.h"

build-android/src/types.h

@@ -0,0 +1,236 @@
+
+#ifndef PTYPES_H
+#define PTYPES_H
+
+#include <SDL_mutex.h>
+#include <SDL_audio.h>
+#include <SDL_scancode.h>
+#include <SDL_mixer.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <SDL.h>
+#include <string.h>
+#include <time.h>
+#include <stdbool.h>
+#include <math.h>
+
+#include "colours.h"
+#include "datatypes.h"
+#include "vect.h"
+
+enum motors {
+    M_GRAVITY = 0,
+    M_FRICTION = 1,
+    M_PLAYER_WALK = 2,
+    M_WINCH = 3
+};
+
+enum world_thing_kind {
+    PLAYER_W = 0,
+    FLOOR = 1,
+    CEILING = 2,
+    ROOM_W,
+    STATIC_WALL_W, 
+    PROJECTILE
+};
+
+
+// used to exert a force on an object
+typedef struct motorstruct {
+    double x; // positive is right
+    double y; // positive is down
+    double torque; // positive is anticlockwise
+    double max_velocity; // max motor output velocity
+                        // does not apply force if the velocity in the 
+                        // direction of the motor vector is greater than
+                        // max_velocity
+    
+    struct timespec timeout;// absolute time (in ns, from when the program starts) 
+                     // for how long the motor runs before stopping
+                     // automatically
+                     // set to -1 for infinity
+    bool stop; // turn the motor off or on
+    void (*update_motor)(struct motorstruct *motor); // function pointer for generating 
+                                        // the motor's output curve
+    struct BodyStruct *end_object;
+} Motor;
+
+typedef struct {
+    int x;
+    int y;
+} Point;
+
+/* String structure, used as a sub-element of a Body, compressible, but not
+ * stretchable. */
+struct String {
+    bool attached;
+    double max_length;
+    Vect end_point;
+    int (*update_end_point)(struct String*); // method to update the end pt
+                                              // say if string is attached
+                                              // to another object
+    int (*set_end_point)(struct String*, Vect *); // manually set the end point of 
+                                           // string
+};
+
+typedef struct String String;
+
+typedef struct BodyStruct{
+    // turn on dynamic physics
+    // For moving objects.
+    // eg. on for payer, off for walls
+    bool dynamics;
+
+    // unique identifier
+    int uid;
+
+    bool colliding;
+    int was_colliding;
+
+    // position in viewport (pixels)
+    SDL_Point screen_pos;
+    SDL_mutex * lock;
+
+    // SI Unit kinematics
+    /*------------------*/
+    Vect position;
+    Vect next_position; // used for casting collision
+    Vect vel;
+    Vect acc;
+
+    // properties
+    double obj_mass; // kgs
+    double obj_elasticity; // rho
+    double obj_friction; // between 0 and 1 (fraction of lateral velocity 
+                         // that is removed)
+
+    //float x_vel;
+    //float y_vel;
+
+    //float x_acc;
+    //float y_acc;
+    /*------------------*/
+
+    // collisions
+    Vect *collision_poly;
+    Vect *collision_shape;
+    int collision_poly_size;
+    int collision_shape_size;
+    void (*updateCollisionPoly)(struct BodyStruct *);
+
+    // fields
+    double glob_friction;
+    bool glob_gravity; // t/f
+
+//    uint32_t last_advance_time;
+
+    struct timespec last_advance_time;
+
+    // applying forces
+    int num_motors;
+    int max_motors;
+    Motor *motors;
+
+    int num_strings;
+    int max_strings;
+    String *strings;
+
+} Body;
+
+typedef struct {
+    bool has_physics;
+    Body *physics;
+    int max_walking_speed;
+    int colliding;
+} player_st;
+
+typedef struct {
+    int numNodes;
+    SDL_Point *nodes;
+    Body *physics;
+} Wall;
+
+typedef struct {
+    Vect left;
+    Vect right;
+    Body *physics; 
+} FloorPoly;
+
+typedef struct {
+    FloorPoly *polys;
+    int numPolys;
+} Floor;
+
+struct physics_collection {
+    int numItems;
+    Body **items;
+};
+
+typedef struct Projectile  {
+    Body *physics;
+    void*(*on_collision)(struct Projectile*);
+    void*(*on_step)(struct Projectile*);
+} Projectile;
+
+struct colour_pallete {
+    struct colour bg;
+    struct colour fg1;
+    struct colour fg2;
+    struct colour fg3;
+};                               
+
+struct environment {
+    int level;
+    Vect position;
+    ArrayList ceil;  // doubles
+    ArrayList floor; // doubles
+    ArrayList bg1;   // doubles
+    ArrayList bg2;   // doubles
+    struct colour_pallete colours;
+    struct physics_collection physics;
+};
+
+struct room {
+    struct environment env;
+    struct physics_collection ceil;
+    struct physics_collection floor;
+};
+
+struct world_thing {
+    enum world_thing_kind kind;
+    int nid;
+    bool collisions;
+    bool physics;
+    // free function for the below type
+    void (*free)(void *); 
+    union {
+        player_st *player;
+        Wall *wall;
+        Floor *floor;
+        Projectile *projectile;
+        struct room *room;
+    };
+};
+
+typedef struct world_thing world_thing;
+
+struct world {
+    world_thing (*get)(int i);
+    ArrayList items;
+    int modified;
+    world_thing** uniques_index;
+};
+
+typedef struct world GlobWorld;
+
+// environment 
+
+enum {
+//    E_ROOM_WIDTH = 100000,
+    E_ROOM_WIDTH = 10000,
+    E_ROOM_RES = 500,
+    E_ROOM_TILES = E_ROOM_WIDTH / E_ROOM_RES,
+};
+
+#endif

build-android/src/vect.c

@@ -0,0 +1,81 @@
+#include "vect.h"
+
+double vect_dot(Vect V, Vect B) {
+    return V.x * B.x + V.y * B.y;
+}
+
+double vect_mag(Vect v) {
+    double mag = sqrt((v.x * v.x) + (v.y * v.y));
+    return mag;
+}
+
+Vect vect_scalar(Vect V, double s) {
+    Vect ret;
+    ret.x = V.x * s;
+    ret.y = V.y * s;
+    return ret;
+}
+
+double vect_arg(Vect v) {
+    return atan2(v.y, v.x);
+}
+
+Vect vect_modarg(double mod, double arg) {
+    Vect ret;
+    ret.x = mod * cos(arg);
+    ret.y = mod * sin(arg);
+    return ret;
+}
+
+Vect vect_rotate(Vect v, double radians) {
+    Vect res;
+
+    res.x = v.x * cos(radians) - v.y * sin(radians);
+    res.y = v.x * sin(radians) + v.y * cos(radians);
+    return res;
+}
+
+Vect vect_add(Vect v1, Vect v2) {
+    Vect res;
+    res.x = v1.x + v2.x;
+    res.y = v1.y + v2.y;
+    return res;
+}
+
+// project one onto two
+Vect project_vect(Vect one, Vect two) {
+    // $$ a \cdot \frac {|b|} {b} $$
+    Vect unittwo;
+    unittwo.x = two.x / vect_mag(two);
+    unittwo.y = two.y / vect_mag(two);
+
+    Vect proj;
+    proj.x = unittwo.x * one.x;
+    proj.y = unittwo.y * one.y;
+
+    return proj;
+}
+
+// project V onto P
+double old_vect_scalar_projection(Vect V, Vect P) {
+    double angle = vect_dir(V) - vect_dir(P);
+    return cos(angle) * vect_mag(V);
+}
+
+double vect_scalar_projection(Vect v, Vect p) {
+    double num = vect_dot(v, p);
+    return num / vect_mag(p);
+}
+
+double vect_dir(Vect V) {
+    return atan2(V.y, V.x);
+}
+
+// distance between two points
+double vect_distance(Vect A, Vect B) {
+    double y = (B.y - A.y);
+    double x = (B.x - A.x);
+    y = y * y;
+    x = x * x;
+    return sqrt(x + y);
+}

build-android/src/vect.h

@@ -0,0 +1,45 @@
+
+#ifndef VECT_H
+#define VECT_H
+#include <math.h>
+
+// origin-centred vector
+typedef struct {
+    double x;
+    double y;
+} Vect;
+
+/* Return the magnitude of two vectors */
+double vect_mag(Vect v); 
+
+/* Return the angle of a vector in radians (using atan2) */
+double vect_dir(Vect V);
+
+/* Return the dot product of two vectors */
+double vect_dot(Vect V, Vect B); 
+
+/* return a vector multiplied by a scalar */
+Vect vect_scalar(Vect V, double s);
+
+/* Return the sum of two vectors */
+Vect vect_add(Vect v1, Vect v2); 
+
+/* Return the projection of vector one onto vector two */
+Vect project_vect(Vect one, Vect two); 
+
+/* Return the scalar projection of V onto P */
+double vect_scalar_projection(Vect V, Vect P); 
+
+/* Return the vector v rotated by radians radians. */
+Vect vect_rotate(Vect v, double radians);
+
+/* Return the argument of v in radians */
+double vect_arg(Vect v);
+
+/* create a vector using modarg form */
+Vect vect_modarg(double mod, double arg); 
+
+/* Return the distance between two point vectors A and B */
+double vect_distance(Vect A, Vect B); 
+
+#endif