Clean up code; adding comments

opengl-test-two/trimap.fragmentshader

@@ -8,7 +8,7 @@ layout(location = 0) out vec3 color;
 //out vec3 color;
 
 // Values that stay constant for the whole mesh.
-uniform sampler2D myTextureSampler;
+uniform sampler2D foreground;
 
 // Relative width/height of a pixel
 uniform float pixWidth;
@@ -27,14 +27,10 @@ int radius = 10;
 
 
 vec3 getColor(vec2 uvCoord) {
-    return texture(myTextureSampler, uvCoord).rgb;
+    return texture(foreground, uvCoord).rgb;
 }
 
 bool isBackground(vec3 c) {
-    /*// 49,206, 11
-    if (all(   lessThanEqual(c, vec3(51.0f/255.0f, 208.0f/255.0f, 13.0f/255.0f))) &&
-        all(greaterThanEqual(c, vec3(47.0f/255.0f, 204.0f/255.0f, 9.0f/255.0f)))*/
-    // 0, 255, 0
     if (all(   lessThanEqual(c, greenValue+difference)) &&
         all(greaterThanEqual(c, greenValue-difference))
         ) {
@@ -74,10 +70,10 @@ void main(){
     }
 
     if (status == IS_BACKGROUND) {
-        color = vec3(0.0f);
+        color = vec3(0.0f); // black
     } else if (status == IS_FOREGROUND) {
-        color = vec3(1.0f);
+        color = vec3(1.0f); // white
     } else {
-        color = vec3(0.5f);
+        color = vec3(0.5f); // gray
     }
 }