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/*
* File: SeparateAlphaTextureShader.frag.txt
* Shader for drawing of textures where the alpha channel is looked up
* separately from the RGB channels, i.e. RGB texel lookup uses texture
* coordinates offset by given optional shift parameters.
*
* (c) 2009 by Mario Kleiner, licensed under MIT license.
*
*/
/* Attributes passed from Screen(): See the ProceduralShadingAPI.m file for infos: */
attribute vec4 modulateColor;
attribute vec4 auxParameters0;
/* Information passed to the fragment shader: */
varying vec4 baseColor;
void main()
{
/* Apply standard geometric transformations to patch: */
gl_Position = ftransform();
/* Don't pass real texture coordinates, but ones corrected for hardware offsets (-0.5,0.5) */
gl_TexCoord[0] = (gl_TextureMatrix[0] * gl_MultiTexCoord0) + vec4(-0.5, 0.5, 0.0, 0.0);
/* Apply offset to primary texcoords, then pass them as secondary texcoords set: */
gl_TexCoord[1] = gl_TexCoord[0] + auxParameters0;
/* Pass through modulateColor: */
baseColor = modulateColor;
}
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