Reviewed shaders and added comments

examples/resources/shaders/swirl.fs

@@ -1,41 +0,0 @@
-#version 330
-
-in vec2 fragTexCoord;
-
-out vec4 fragColor;
-
-uniform sampler2D texture0;
-uniform vec4 fragTintColor;
-
-// NOTE: Add here your custom variables
-
-const float renderWidth = 800.0;      // HARDCODED for example!
-const float renderHeight = 480.0;     // Use uniforms instead...
-
-float radius = 250.0;
-float angle = 0.8;
-
-uniform vec2 center = vec2(200.0, 200.0);
-
-void main (void)
-{
-    vec2 texSize = vec2(renderWidth, renderHeight);
-    vec2 tc = fragTexCoord*texSize;
-    tc -= center;
-    float dist = length(tc);
-
-    if (dist < radius) 
-    {
-        float percent = (radius - dist)/radius;
-        float theta = percent*percent*angle*8.0;
-        float s = sin(theta);
-        float c = cos(theta);
-        
-        tc = vec2(dot(tc, vec2(c, -s)), dot(tc, vec2(s, c)));
-    }
-
-    tc += center;
-    vec3 color = texture2D(texture0, tc/texSize).rgb;
-
-    fragColor = vec4(color, 1.0);;
-}