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shaders and projected depth maps

Subject: shaders and projected depth maps
From: Greg Keech <email@hidden>
Date: Thu, 17 May 2007 13:05:30 -0600
Delivered-to: email@hidden
Delivered-to: email@hidden

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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