Updated shaders with comments

examples/resources/shaders/glsl100/bloom.fs

@@ -33,5 +33,5 @@ void main()
     else if (texelColor.r < 0.5) tc = sum*sum*0.009 + texelColor;
     else tc = sum*sum*0.0075 + texelColor;
     
-    finalColor = tc;
+    gl_FragColor = tc;
 }

examples/resources/shaders/glsl100/swirl.fs

@@ -20,7 +20,7 @@ float angle = 0.8;
 
 uniform vec2 center = vec2(200.0, 200.0);
 
-void main (void)
+void main()
 {
     vec2 texSize = vec2(renderWidth, renderHeight);
     vec2 tc = fragTexCoord*texSize;

examples/resources/shaders/glsl330/phong.fs

@@ -29,6 +29,9 @@ uniform float matGlossiness = 50.0;
 uniform vec3 lightPosition;
 uniform vec3 cameraPosition;
 
+// Fragment shader output data
+out vec4 fragColor;
+
 // Calculate ambient lighting component
 vec3 AmbientLighting()
 {

examples/resources/shaders/glsl330/swirl.fs

@@ -21,7 +21,7 @@ float angle = 0.8;
 
 uniform vec2 center = vec2(200.0, 200.0);
 
-void main (void)
+void main()
 {
     vec2 texSize = vec2(renderWidth, renderHeight);
     vec2 tc = fragTexCoord*texSize;

shaders/glsl100/base.vs

@@ -1,20 +1,26 @@
 #version 100
 
+// Input vertex attributes
 attribute vec3 vertexPosition;
 attribute vec2 vertexTexCoord;
 attribute vec3 vertexNormal;
+attribute vec4 vertexColor;
 
-varying vec2 fragTexCoord;
+// Input uniform values
-
 uniform mat4 mvpMatrix;
 
+// Output vertex attributes (to fragment shader)
+varying vec2 fragTexCoord;
+varying vec4 fragColor;
+
 // NOTE: Add here your custom variables 
 
 void main()
 {
-    vec3 normal = vertexNormal;
+    // Send vertex attributes to fragment shader
-    
     fragTexCoord = vertexTexCoord;
+    fragColor = vertexColor;
     
+    // Calculate final vertex position
     gl_Position = mvpMatrix*vec4(vertexPosition, 1.0);
 }

shaders/glsl100/bloom.fs

@@ -2,8 +2,11 @@
 
 precision mediump float;
 
+// Input vertex attributes (from vertex shader)
 varying vec2 fragTexCoord;
+varying vec4 fragColor;
 
+// Input uniform values
 uniform sampler2D texture0;
 uniform vec4 fragTintColor;
 
@@ -22,21 +25,13 @@ void main()
         }
     }
     
-    if (texture2D(texture0, fragTexCoord).r < 0.3)
+    // Texel color fetching from texture sampler
-    {
+    vec4 texelColor = texture(texture0, fragTexCoord);
-        tc = sum*sum*0.012 + texture2D(texture0, fragTexCoord);
+    
-    }
+    // Calculate final fragment color
-    else
+    if (texelColor.r < 0.3) tc = sum*sum*0.012 + texelColor;
-    {
+    else if (texelColor.r < 0.5) tc = sum*sum*0.009 + texelColor;
-        if (texture2D(texture0, fragTexCoord).r < 0.5)
+    else tc = sum*sum*0.0075 + texelColor;
-        {
-            tc = sum*sum*0.009 + texture2D(texture0, fragTexCoord);
-        }
-        else
-        {
-            tc = sum*sum*0.0075 + texture2D(texture0, fragTexCoord);
-        }
-    }
     
     gl_FragColor = tc;
 }

shaders/glsl100/blur.fs

@@ -2,7 +2,11 @@
 
 precision mediump float;
 
+// Input vertex attributes (from vertex shader)
 varying vec2 fragTexCoord;
+varying vec4 fragColor;
+
+// Input uniform values
 uniform sampler2D texture0;
 uniform vec4 fragTintColor;
 
@@ -16,6 +20,7 @@ float weight[3] = float[]( 0.2270270270, 0.3162162162, 0.0702702703 );
 
 void main() 
 { 
+    // Texel color fetching from texture sampler
     vec3 tc = texture2D(texture0, fragTexCoord).rgb*weight[0];
 
     for (int i = 1; i < 3; i++) 

shaders/glsl100/cross_hatching.fs

@@ -2,8 +2,11 @@
 
 precision mediump float;
 
+// Input vertex attributes (from vertex shader)
 varying vec2 fragTexCoord;
+varying vec4 fragColor;
 
+// Input uniform values
 uniform sampler2D texture0;
 uniform vec4 fragTintColor;
 

shaders/glsl100/cross_stitching.fs

@@ -2,8 +2,11 @@
 
 precision mediump float;
 
+// Input vertex attributes (from vertex shader)
 varying vec2 fragTexCoord;
+varying vec4 fragColor;
 
+// Input uniform values
 uniform sampler2D texture0;
 uniform vec4 fragTintColor;
 
@@ -46,7 +49,7 @@ vec4 PostFX(sampler2D tex, vec2 uv)
     return c;
 }
 
-void main(void)
+void main()
 {
     vec3 tc = PostFX(texture0, fragTexCoord).rgb;
 

shaders/glsl100/dream_vision.fs

@@ -2,8 +2,11 @@
 
 precision mediump float;
 
+// Input vertex attributes (from vertex shader)
 varying vec2 fragTexCoord;
+varying vec4 fragColor;
 
+// Input uniform values
 uniform sampler2D texture0;
 uniform vec4 fragTintColor;
 

shaders/glsl100/fisheye.fs

@@ -2,8 +2,11 @@
 
 precision mediump float;
 
+// Input vertex attributes (from vertex shader)
 varying vec2 fragTexCoord;
+varying vec4 fragColor;
 
+// Input uniform values
 uniform sampler2D texture0;
 uniform vec4 fragTintColor;
 

shaders/glsl100/grayscale.fs

@@ -2,8 +2,11 @@
 
 precision mediump float;
 
+// Input vertex attributes (from vertex shader)
 varying vec2 fragTexCoord;
+varying vec4 fragColor;
 
+// Input uniform values
 uniform sampler2D texture0;
 uniform vec4 fragTintColor;
 
@@ -11,10 +14,12 @@ uniform vec4 fragTintColor;
 
 void main()
 {
-    vec4 base = texture2D(texture0, fragTexCoord)*fragTintColor;
+    // Texel color fetching from texture sampler
+    vec4 texelColor = texture(texture0, fragTexCoord)*fragTintColor*fragColor;
     
-    // Convert to grayscale using NTSC conversion weights
+    // Convert texel color to grayscale using NTSC conversion weights
-    float gray = dot(base.rgb, vec3(0.299, 0.587, 0.114));
+    float gray = dot(texelColor.rgb, vec3(0.299, 0.587, 0.114));
     
-    gl_FragColor = vec4(gray, gray, gray, fragTintColor.a);
+    // Calculate final fragment color
+    gl_FragColor = vec4(gray, gray, gray, texelColor.a);
 }

shaders/glsl100/pixel.fs

@@ -2,8 +2,11 @@
 
 precision mediump float;
 
+// Input vertex attributes (from vertex shader)
 varying vec2 fragTexCoord;
+varying vec4 fragColor;
 
+// Input uniform values
 uniform sampler2D texture0;
 uniform vec4 fragTintColor;
 

shaders/glsl100/posterization.fs

@@ -2,8 +2,11 @@
 
 precision mediump float;
 
+// Input vertex attributes (from vertex shader)
 varying vec2 fragTexCoord;
+varying vec4 fragColor;
 
+// Input uniform values
 uniform sampler2D texture0;
 uniform vec4 fragTintColor;
 

shaders/glsl100/predator.fs

@@ -2,8 +2,11 @@
 
 precision mediump float;
 
+// Input vertex attributes (from vertex shader)
 varying vec2 fragTexCoord;
+varying vec4 fragColor;
 
+// Input uniform values
 uniform sampler2D texture0;
 uniform vec4 fragTintColor;
 

shaders/glsl100/scanlines.fs

@@ -2,8 +2,11 @@
 
 precision mediump float;
 
+// Input vertex attributes (from vertex shader)
 varying vec2 fragTexCoord;
+varying vec4 fragColor;
 
+// Input uniform values
 uniform sampler2D texture0;
 uniform vec4 fragTintColor;
 
@@ -14,7 +17,7 @@ float frequency = 720/3.0;
 
 uniform float time;
 
-void main (void)
+void main()
 {
 /*
     // Scanlines method 1

shaders/glsl100/swirl.fs

@@ -2,26 +2,30 @@
 
 precision mediump float;
 
+// Input vertex attributes (from vertex shader)
 varying vec2 fragTexCoord;
+varying vec4 fragColor;
 
+// Input uniform values
 uniform sampler2D texture0;
 uniform vec4 fragTintColor;
 
 // NOTE: Add here your custom variables
 
-const float renderWidth = 1280; 
+const float renderWidth = 800.0;      // HARDCODED for example!
-const float renderHeight = 720; 
+const float renderHeight = 480.0;     // Use uniforms instead...
 
 float radius = 250.0;
 float angle = 0.8;
 
-uniform vec2 center = vec2(200, 200);
+uniform vec2 center = vec2(200.0, 200.0);
 
-void main (void)
+void main()
 {
     vec2 texSize = vec2(renderWidth, renderHeight);
     vec2 tc = fragTexCoord*texSize;
     tc -= center;
+    
     float dist = length(tc);
 
     if (dist < radius) 

shaders/glsl100/template.fs

@@ -2,8 +2,11 @@
 
 precision mediump float;
 
+// Input vertex attributes (from vertex shader)
 varying vec2 fragTexCoord;
+varying vec4 fragColor;
 
+// Input uniform values
 uniform sampler2D texture0;
 uniform vec4 fragTintColor;
 
@@ -11,6 +14,7 @@ uniform vec4 fragTintColor;
 
 void main()
 {
+    // Texel color fetching from texture sampler
     vec4 texelColor = texture2D(texture0, fragTexCoord);
     
     // NOTE: Implement here your fragment shader code

shaders/glsl330/base.vs

@@ -1,18 +1,26 @@
 #version 330
 
+// Input vertex attributes
 in vec3 vertexPosition;
 in vec2 vertexTexCoord;
 in vec3 vertexNormal;
+in vec4 vertexColor;
 
-out vec2 fragTexCoord;
+// Input uniform values
-
 uniform mat4 mvpMatrix;
 
+// Output vertex attributes (to fragment shader)
+out vec2 fragTexCoord;
+out vec4 fragColor;
+
 // NOTE: Add here your custom variables 
 
 void main()
 {
+    // Send vertex attributes to fragment shader
     fragTexCoord = vertexTexCoord;
+    fragColor = vertexColor;
     
+    // Calculate final vertex position
     gl_Position = mvpMatrix*vec4(vertexPosition, 1.0);
 }