Added some useful postprocessing shaders

Shaders come in two flavours:
- shaders/gl330: OpenGL 3.3+ (Windows, Linux, OSX)
- shaders/gles100:  OpenGL ES 2.0 (Android, RPI, HTML5)

1 files changed, 41 insertions, 0 deletions

diff --git a/shaders/gles100/scanlines.fs b/shaders/gles100/scanlines.fs
new file mode 100644
index 00000000..56a6f694
--- /dev/null
+++ b/shaders/gles100/scanlines.fs
@@ -0,0 +1,41 @@
+#version 100
+
+precision mediump float;
+
+varying vec2 fragTexCoord;
+
+uniform sampler2D texture0;
+uniform vec4 tintColor;
+
+// NOTE: Add here your custom variables
+
+float offset = 0;
+float frequency = 720/3.0;
+
+uniform float time;
+
+void main (void)
+{
+/*
+    // Scanlines method 1
+    float tval = 0; //time
+    vec2 uv = 0.5 + (fragTexCoord - 0.5)*(0.9 + 0.01*sin(0.5*tval));
+
+    vec4 color = texture2D(texture0, fragTexCoord);
+
+    color = clamp(color*0.5 + 0.5*color*color*1.2, 0.0, 1.0);
+    color *= 0.5 + 0.5*16.0*uv.x*uv.y*(1.0 - uv.x)*(1.0 - uv.y);
+    color *= vec4(0.8, 1.0, 0.7, 1);
+    color *= 0.9 + 0.1*sin(10.0*tval + uv.y*1000.0);
+    color *= 0.97 + 0.03*sin(110.0*tval);
+
+    fragColor = color;
+*/
+    // Scanlines method 2
+    float globalPos = (fragTexCoord.y + offset) * frequency;
+    float wavePos = cos((fract(globalPos) - 0.5)*3.14);
+    
+    vec4 color = texture2D(texture0, fragTexCoord);
+
+    gl_FragColor = mix(vec4(0, 0.3, 0, 0), color, wavePos);
+}
\ No newline at end of file