Reviewed shaders and added comments

14 files changed, 223 insertions, 112 deletions

diff --git a/examples/resources/shaders/bloom.fs b/examples/resources/shaders/bloom.fs
deleted file mode 100644
index 0a73161a..00000000
--- a/examples/resources/shaders/bloom.fs
+++ /dev/null
@@ -1,43 +0,0 @@
-#version 330
-
-in vec2 fragTexCoord;
-in vec4 fragTintColor;
-
-out vec4 fragColor;
-
-uniform sampler2D texture0;
-//uniform vec4 fragTintColor;
-
-// NOTE: Add here your custom variables
-
-void main()
-{
-    vec4 sum = vec4(0);
-    vec4 tc = vec4(0);
-
-    for (int i = -4; i < 4; i++)
-    {
-        for (int j = -3; j < 3; j++)
-        {
-            sum += texture2D(texture0, fragTexCoord + vec2(j, i)*0.004) * 0.25;
-        }
-    }
-    
-    if (texture2D(texture0, fragTexCoord).r < 0.3)
-    {
-        tc = sum*sum*0.012 + texture2D(texture0, fragTexCoord);
-    }
-    else
-    {
-        if (texture2D(texture0, fragTexCoord).r < 0.5)
-        {
-            tc = sum*sum*0.009 + texture2D(texture0, fragTexCoord);
-        }
-        else
-        {
-            tc = sum*sum*0.0075 + texture2D(texture0, fragTexCoord);
-        }
-    }
-    
-    fragColor = tc;
-}
\ No newline at end of file
diff --git a/examples/resources/shaders/glsl100/base.vs b/examples/resources/shaders/glsl100/base.vs
new file mode 100644
index 00000000..e9386939
--- /dev/null
+++ b/examples/resources/shaders/glsl100/base.vs
@@ -0,0 +1,26 @@
+#version 100
+
+// Input vertex attributes
+attribute vec3 vertexPosition;
+attribute vec2 vertexTexCoord;
+attribute vec3 vertexNormal;
+attribute vec4 vertexColor;
+
+// 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()
+{
+    // Send vertex attributes to fragment shader
+    fragTexCoord = vertexTexCoord;
+    fragColor = vertexColor;
+    
+    // Calculate final vertex position
+    gl_Position = mvpMatrix*vec4(vertexPosition, 1.0);
+}
\ No newline at end of file
diff --git a/examples/resources/shaders/glsl100/bloom.fs b/examples/resources/shaders/glsl100/bloom.fs
new file mode 100644
index 00000000..5a08843d
--- /dev/null
+++ b/examples/resources/shaders/glsl100/bloom.fs
@@ -0,0 +1,37 @@
+#version 100
+
+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
+
+void main()
+{
+    vec4 sum = vec4(0);
+    vec4 tc = vec4(0);
+
+    for (int i = -4; i < 4; i++)
+    {
+        for (int j = -3; j < 3; j++)
+        {
+            sum += texture2D(texture0, fragTexCoord + vec2(j, i)*0.004) * 0.25;
+        }
+    }
+    
+    // Texel color fetching from texture sampler
+    vec4 texelColor = texture(texture0, fragTexCoord);
+    
+    // Calculate final fragment color
+    if (texelColor.r < 0.3) tc = sum*sum*0.012 + texelColor;
+    else if (texelColor.r < 0.5) tc = sum*sum*0.009 + texelColor;
+    else tc = sum*sum*0.0075 + texelColor;
+    
+    finalColor = tc;
+}
\ No newline at end of file
diff --git a/examples/resources/shaders/glsl100/grayscale.fs b/examples/resources/shaders/glsl100/grayscale.fs
new file mode 100644
index 00000000..f92ec335
--- /dev/null
+++ b/examples/resources/shaders/glsl100/grayscale.fs
@@ -0,0 +1,25 @@
+#version 100
+
+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
+
+void main()
+{
+    // Texel color fetching from texture sampler
+    vec4 texelColor = texture(texture0, fragTexCoord)*fragTintColor*fragColor;
+    
+    // Convert texel color to grayscale using NTSC conversion weights
+    float gray = dot(texelColor.rgb, vec3(0.299, 0.587, 0.114));
+    
+    // Calculate final fragment color
+    gl_FragColor = vec4(gray, gray, gray, texelColor.a);
+}
\ No newline at end of file
diff --git a/examples/resources/shaders/glsl100/swirl.fs b/examples/resources/shaders/glsl100/swirl.fs
new file mode 100644
index 00000000..e77d4f87
--- /dev/null
+++ b/examples/resources/shaders/glsl100/swirl.fs
@@ -0,0 +1,45 @@
+#version 100
+
+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 = 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;
+
+    gl_FragColor = vec4(color, 1.0);;
+}
\ No newline at end of file
diff --git a/examples/resources/shaders/base.vs b/examples/resources/shaders/glsl330/base.vs
index 9b8cca69..638cb8ae 100644
--- a/examples/resources/shaders/base.vs
+++ b/examples/resources/shaders/glsl330/base.vs
@@ -1,21 +1,26 @@
 #version 330
 
+// Input vertex attributes
 in vec3 vertexPosition;
 in vec2 vertexTexCoord;
 in vec3 vertexNormal;
 in vec4 vertexColor;
 
-out vec2 fragTexCoord;
-out vec4 fragTintColor;
-
+// 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;
-    fragTintColor = vertexColor;
+    fragColor = vertexColor;
     
+    // Calculate final vertex position
     gl_Position = mvpMatrix*vec4(vertexPosition, 1.0);
 }
\ No newline at end of file
diff --git a/examples/resources/shaders/glsl330/bloom.fs b/examples/resources/shaders/glsl330/bloom.fs
new file mode 100644
index 00000000..c8cb0d32
--- /dev/null
+++ b/examples/resources/shaders/glsl330/bloom.fs
@@ -0,0 +1,38 @@
+#version 330
+
+// Input vertex attributes (from vertex shader)
+in vec2 fragTexCoord;
+in vec4 fragColor;
+
+// Input uniform values
+uniform sampler2D texture0;
+uniform vec4 fragTintColor;
+
+// Output fragment color
+out vec4 finalColor;
+
+// NOTE: Add here your custom variables
+
+void main()
+{
+    vec4 sum = vec4(0);
+    vec4 tc = vec4(0);
+    
+    for (int i = -4; i < 4; i++)
+    {
+        for (int j = -3; j < 3; j++)
+        {
+            sum += texture2D(texture0, fragTexCoord + vec2(j, i)*0.004)*0.25;
+        }
+    }
+    
+    // Texel color fetching from texture sampler
+    vec4 texelColor = texture(texture0, fragTexCoord);
+    
+    // Calculate final fragment color
+    if (texelColor.r < 0.3) tc = sum*sum*0.012 + texelColor;
+    else if (texelColor.r < 0.5) tc = sum*sum*0.009 + texelColor;
+    else tc = sum*sum*0.0075 + texelColor;
+
+    finalColor = tc;
+}
\ No newline at end of file
diff --git a/examples/resources/shaders/glsl330/grayscale.fs b/examples/resources/shaders/glsl330/grayscale.fs
new file mode 100644
index 00000000..d4a8824f
--- /dev/null
+++ b/examples/resources/shaders/glsl330/grayscale.fs
@@ -0,0 +1,26 @@
+#version 330
+
+// Input vertex attributes (from vertex shader)
+in vec2 fragTexCoord;
+in vec4 fragColor;
+
+// Input uniform values
+uniform sampler2D texture0;
+uniform vec4 fragTintColor;
+
+// Output fragment color
+out vec4 finalColor;
+
+// NOTE: Add here your custom variables
+
+void main()
+{
+    // Texel color fetching from texture sampler
+    vec4 texelColor = texture(texture0, fragTexCoord)*fragTintColor*fragColor;
+    
+    // Convert texel color to grayscale using NTSC conversion weights
+    float gray = dot(texelColor.rgb, vec3(0.299, 0.587, 0.114));
+    
+    // Calculate final fragment color
+    finalColor = vec4(gray, gray, gray, texelColor.a);
+}
\ No newline at end of file
diff --git a/examples/resources/shaders/phong.fs b/examples/resources/shaders/glsl330/phong.fs
index f79413d9..2e7a95f6 100644
--- a/examples/resources/shaders/phong.fs
+++ b/examples/resources/shaders/glsl330/phong.fs
@@ -1,6 +1,6 @@
 #version 330
 
-// Vertex shader input data
+// Input vertex attributes (from vertex shader)
 in vec2 fragTexCoord;
 in vec3 fragNormal;
 
diff --git a/examples/resources/shaders/phong.vs b/examples/resources/shaders/glsl330/phong.vs
index 52cc2227..d68d9b3f 100644
--- a/examples/resources/shaders/phong.vs
+++ b/examples/resources/shaders/glsl330/phong.vs
@@ -1,25 +1,25 @@
 #version 330
 
-// Vertex input data
+// Input vertex attributes
 in vec3 vertexPosition;
 in vec2 vertexTexCoord;
 in vec3 vertexNormal;
 
-// Projection and model data
+// Input uniform values
 uniform mat4 mvpMatrix;
 
-uniform mat4 modelMatrix;
-//uniform mat4 viewMatrix;  // Not used
-
-// Attributes to fragment shader
+// Output vertex attributes (to fragment shader)
 out vec2 fragTexCoord;
 out vec3 fragNormal;
 
+// NOTE: Add here your custom variables
+uniform mat4 modelMatrix;
+
 void main()
 {
-    // Send texture coord to fragment shader
+    // Send vertex attributes to fragment shader
     fragTexCoord = vertexTexCoord;
-    
+
     // Calculate view vector normal from model
     mat3 normalMatrix = transpose(inverse(mat3(modelMatrix)));
     fragNormal = normalize(normalMatrix*vertexNormal);
diff --git a/examples/resources/shaders/swirl.fs b/examples/resources/shaders/glsl330/swirl.fs
index f89ef406..b1dc82f0 100644
--- a/examples/resources/shaders/swirl.fs
+++ b/examples/resources/shaders/glsl330/swirl.fs
@@ -1,12 +1,16 @@
 #version 330
 
+// Input vertex attributes (from vertex shader)
 in vec2 fragTexCoord;
+in vec4 fragColor;
 
-out vec4 fragColor;
-
+// Input uniform values
 uniform sampler2D texture0;
 uniform vec4 fragTintColor;
 
+// Output fragment color
+out vec4 finalColor;
+
 // NOTE: Add here your custom variables
 
 const float renderWidth = 800.0;      // HARDCODED for example!
@@ -22,6 +26,7 @@ void main (void)
     vec2 texSize = vec2(renderWidth, renderHeight);
     vec2 tc = fragTexCoord*texSize;
     tc -= center;
+    
     float dist = length(tc);
 
     if (dist < radius) 
@@ -37,5 +42,5 @@ void main (void)
     tc += center;
     vec3 color = texture2D(texture0, tc/texSize).rgb;
 
-    fragColor = vec4(color, 1.0);;
+    finalColor = vec4(color, 1.0);;
 }
\ No newline at end of file
diff --git a/examples/resources/shaders/grayscale.fs b/examples/resources/shaders/grayscale.fs
deleted file mode 100644
index af50b8c1..00000000
--- a/examples/resources/shaders/grayscale.fs
+++ /dev/null
@@ -1,20 +0,0 @@
-#version 330
-
-in vec2 fragTexCoord;
-
-out vec4 fragColor;
-
-uniform sampler2D texture0;
-uniform vec4 fragTintColor;
-
-// NOTE: Add here your custom variables
-
-void main()
-{
-    vec4 base = texture2D(texture0, fragTexCoord)*fragTintColor;
-    
-    // Convert to grayscale using NTSC conversion weights
-    float gray = dot(base.rgb, vec3(0.299, 0.587, 0.114));
-    
-    fragColor = vec4(gray, gray, gray, fragTintColor.a);
-}
\ No newline at end of file
diff --git a/examples/resources/shaders/shapes_base.vs b/examples/resources/shaders/shapes_base.vs
deleted file mode 100644
index ad272dc1..00000000
--- a/examples/resources/shaders/shapes_base.vs
+++ /dev/null
@@ -1,18 +0,0 @@
-#version 330
-
-attribute vec3 vertexPosition;
-attribute vec2 vertexTexCoord;
-attribute vec4 vertexColor;
-
-uniform mat4 mvpMatrix;
-
-varying vec2 fragTexCoord;
-varying vec4 fragTintColor;
-
-void main()
-{
-    fragTexCoord = vertexTexCoord;
-    fragTintColor = vertexColor;
-    
-    gl_Position = mvpMatrix*vec4(vertexPosition, 1.0);
-}
\ No newline at end of file
diff --git a/examples/resources/shaders/shapes_grayscale.fs b/examples/resources/shaders/shapes_grayscale.fs
deleted file mode 100644
index 0698e1bf..00000000
--- a/examples/resources/shaders/shapes_grayscale.fs
+++ /dev/null
@@ -1,15 +0,0 @@
-#version 330
-
-uniform sampler2D texture0;
-varying vec2 fragTexCoord;
-varying vec4 fragTintColor;
-
-void main()
-{
-    vec4 base = texture2D(texture0, fragTexCoord)*fragTintColor;
-
-    // Convert to grayscale using NTSC conversion weights
-    float gray = dot(base.rgb, vec3(0.299, 0.587, 0.114));
-    
-    gl_FragColor = vec4(gray, gray, gray, base.a);
-}
\ No newline at end of file