I'm currently attempting to create a shader that takes an image and a
depth map. The depth map is being projected from the light's point of
view using projective texture mapping. If I access only one of the
textures it works fine, but as soon as I attempt to use
multitexturing within the shader I get inconsistent and incorrect
results. Here's an example of a simple shader that isn't working for
me:
//BEGIN SHADER
uniform sampler2DRect image;
uniform sampler2DRectShadow depthMap;
void main (void)
{
vec4 img = texture2DRect(image, gl_FragCoord.st);
gl_FragColor = img * shadow2DRectProj(depthMap, gl_TexCoord[1]);
}
//END SHADER
If I access the texture independently it works as expected for that
shader. Has anyone else gotten multi texturing and projective depth
maps working? I have tried this on both intel and Power PC to no
avail. It seems to be something with the projective textures but I
haven't been able to track it down. Any help or hints would be
greatly appreciated.
Thanks
Greg Keech
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