custom rng for platform uniformity

src/basic-lib.c

@@ -96,5 +96,3 @@ void get_time(void) {
 
 }
 
-
-

src/draw.c

@@ -282,11 +282,9 @@ void new_update_viewport(Body const * const pl) {
     if (last_plpos.x == 0 && last_plpos.y == 0)
         last_plpos = player.physics->position;
 
-    printf("%f %f\n", pl->vel.x, pl->vel.y);
     static Vect lmove = {};
 
     Vect iv = in_view(pl->position);
-    printf("player   pos: %f %f\n", pl->position.x, pl->position.y);
 
     Vect left_pos = {0, 2 * height / 4};
     left_pos = vect_add(pl->position, vect_scalar(left_pos, -1));
@@ -309,10 +307,8 @@ void new_update_viewport(Body const * const pl) {
     if (true || (recover) //|| vect_mag((Vect){pl->vel.x, 0}) > 0.4 
             || (dist_change > width / 100)) {
         if (iv.x < width / 6) {
-            printf("RIGHT\n");
             target = right_pos;
         } else {
-            printf("LEFT\n");
             target = left_pos;
         }
         lmove = target;
@@ -343,8 +339,6 @@ void new_update_viewport(Body const * const pl) {
             /*}*/
 
     //target.y = pl->position.y - height/2; // + y;
-    printf("viewport pos: %f %f\n", iv.x, iv.y);
-    printf("target pos: %f %f\n", target.x, iv.y);
 
         /*}*/
     /*}*/
@@ -360,12 +354,10 @@ void new_update_viewport(Body const * const pl) {
     // move towards target a set proportion
     Vect urgency = vect_add(target, vect_scalar(player.physics->position, -1));
     Vect p = vect_add(target, vect_scalar(viewport_pos, -1));
-    printf("drawtime: %f", time_delta);
 
     double proportion = (sigmoid(time_delta) / 100);
     proportion = 2 * player.physics->vel.x / (width);
     proportion = proportion < 0 ? -proportion : proportion;
-    printf("prop: %f", proportion);
 
     proportion > 0.4 ? proportion = 0.4 : 0;
     proportion < 0 ? proportion = 0.000001 : 0;

src/environment.c

@@ -1,4 +1,5 @@
 #include "environment.h"
+#include "game.h"
 
 double linear_interpolate(double a0, double a1, double w) {
     return (1.0f - w) * a0 + w * a1;
@@ -53,8 +54,15 @@ double perlin(Vect coordinate) {
 
 
 struct colour_pallete get_pallete (int seed) {
-    struct colour base = get_random_color(seed);
+    struct colour base;
 
+    int red = get_rand(0) % 255;
+    int blue = get_rand(0) % 255;
+    int green = get_rand(0) % 255;
+
+    base.r = red;
+    base.g = green;
+    base.b = blue;
 
     struct colour c1 = get_hsv(base);
     c1 = get_hsv(base);
@@ -115,7 +123,7 @@ struct environment get_scene_at(Vect coordinate, int seed) {
     bit.y = 100 * seed;
     Vect pos;
 
-    srand(seed);
+    get_rand(seed);
 
     Vect node;
     node.y = 0;
@@ -125,9 +133,9 @@ struct environment get_scene_at(Vect coordinate, int seed) {
         bit.y = seed;
         node.x = bit.x;
 
-        int r1 = 1.5*(rand() % 500) - (rand() % 100); 
-        int r2 = 1.5*(rand() % 200) - (rand() % 200);
-        int r3 = (rand() % 100) - (rand() % 500);
+        int r1 = 1.5*(get_rand(0) % 500) - (get_rand(0) % 100); 
+        int r2 = 1.5*(get_rand(0) % 200) - (get_rand(0) % 200);
+        int r3 = (get_rand(0) % 100) - (get_rand(0) % 500);
         int r4 = 50;
 
         int r[4] = {r1, r2, r3, r4};

src/game.c

@@ -1,4 +1,5 @@
 #include "game.h"
+#include <SDL2/SDL_scancode.h>
 #include <SDL2/SDL_timer.h>
 #include <SDL2/SDL_ttf.h>
 #include <SDL2/SDL_mutex.h>
@@ -111,8 +112,8 @@ FloorPoly* generate_floor_simple(int num_polys, bool extend_down, int st_height)
     last.y = st_height;
 
     for (int i = 0; i < num_polys; i++) {
-        double run = (rand() % 900);
-        double rise = (rand() % 100) - (rand() % 100);
+        double run = (get_rand(0) % 900);
+        double rise = (get_rand(0) % 100) - (get_rand(0) % 100);
         next.x = last.x + run;
         next.y = last.y + rise;
 
@@ -578,7 +579,7 @@ void next_level() {
     destroy_physics_collection(&world.uniques_index[ROOM_W]->room->floor);
     destroy_environment(&world.uniques_index[ROOM_W]->room->env);
 
-    level++;
+    level+= 31;;
     get_floor_ceiling();
 
     v = world.uniques_index[ROOM_W]->room->ceil.items[2]->collision_poly[0];
@@ -1374,7 +1375,6 @@ void add_to_world(world_thing thing) {
         world.uniques_index[thing.kind] = ref;
     }
 
-    printf("Added to world: %d\n", thing.kind);
 }
 
 /* Send a projectile from body in direction dir (in degrees) with the force of 
@@ -1434,7 +1434,7 @@ void startgame(SDL_Renderer * ren) {
 
     debug_ren = ren;
 
-    level = 113;
+    level = 31;
 
     world = create_world();
 
@@ -1505,6 +1505,9 @@ void handle_input_event(SDL_Event event) {
             } if (sc == input_map.player_pull_rope) {
                 stop_pull_rope();
             } 
+            if (event.key.keysym.scancode == SDL_SCANCODE_F10) {
+                next_level();
+            }
             break;
         case SDL_MOUSEBUTTONDOWN:
             add_rope(event.button.x, event.button.y);
@@ -1527,6 +1530,24 @@ void handle_input_event(SDL_Event event) {
     }
 }
 
+
+int get_rand(int seed) {
+    const unsigned c = 11;
+    const unsigned m = (1 << 31) - 1;
+    const unsigned initial_n = 1;
+    const unsigned a = 48271;
+
+    static unsigned n = initial_n;
+
+    if (seed != 0) {
+        n = seed ;
+    }
+
+    n = (a * n + c) % m;
+    return n;
+}
+
+
 void step(int interval) { 
 
     if (player.physics->position.x > world.uniques_index[ROOM_W]->room
@@ -1538,3 +1559,6 @@ void step(int interval) {
 
     advance_things();
 }
+
+
+

src/game.h

@@ -20,6 +20,8 @@ void add_motor(Body *thing, double x, double y);
 
 bool get_motor_active(Body *thing, int i); 
 
+int get_rand(int seed);
+
 /* array of all the things in the world and their kinds */
 extern void startgame(SDL_Renderer * ren) ;
 extern void process_keydown(SDL_Keysym key);