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/* ClutBlitShader.frag -- Brute force CLUT animation.
* Shader for application of a color lookup table to a texture image.
* Reads each texels color index from red/luminance channel of texture
* 'Image', does a index -> color lookup in lookup table texture 'clut'.
* Assigns looked up color RGB to output fragment color RGB. Copies alpha
* channels value unmodified.
* This shader is used by moglClutBlit.m to implement CLUT animation caps.
*
* (w)2006 by Mario Kleiner. Licensed under MIT license.
*/
#extension GL_ARB_texture_rectangle : enable
uniform sampler2DRect Image;
uniform sampler2DRect clut;
void main()
{
vec4 incolor = texture2DRect(Image, gl_TexCoord[0].st);
float index = incolor.r * 255.0 + 0.5;
gl_FragColor.rgb = texture2DRect(clut, vec2(index, 0)).rgb;
gl_FragColor.a = incolor.a;
}
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