convert to linear srgb on diffuse sample

assets/shaders/g_frag.gl

@@ -75,6 +75,19 @@ struct Material {
 
 uniform Material material;
 
+
+// https://gamedev.stackexchange.com/questions/92015/optimized-linear-to-srgb-glsl
+// Converts a color from sRGB gamma to linear light gamma
+vec3 toLinear(vec3 sRGB)
+{
+    bvec3 cutoff = lessThan(sRGB, vec3(0.04045));
+    vec3 higher = pow((sRGB + vec3(0.055))/vec3(1.055), vec3(2.4));
+    vec3 lower = sRGB/vec3(12.92);
+
+    return mix(higher, lower, cutoff);
+}
+
+
 void
 main() {
     // store the fragment position vector in the first gbuffer texture
@@ -95,6 +108,6 @@ main() {
     if (tex.a < 0.1)  
         discard;
 
-    gAlbedoSpec.rgb = tex.rgb;    // store specular intensity in gAlbedoSpec's alpha component
+    gAlbedoSpec.rgb = toLinear(tex.rgb);    // store specular intensity in gAlbedoSpec's alpha component
     gAlbedoSpec.a = texture(material.texture_specular1, theTexCoord).r;
 }