Framebuffer Object, can't write to multiple Textures

Hello,
i am trying to write to 2 textures attached to a framebuffer object, but i can’t seem to get it to work.
First, in my shader i have the line

#extension GL_ARB_draw_buffers : enable

and i get the following “warning C7508: extension GL_ARB_draw_buffers not supported” even though the extension string says my card is capable of GL_ARB_draw_buffers (NV GeForce 7800GS with driver version 6.14.10.9371)

I set the FBO up as follows

//create textures
glGenTextures(2, m_shadowmaps);
for (int l = 0; l < 2; l++)
{
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,m_shadowmaps[l]);
glTexParameterf(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB,0,GL_RGB,320,240,0,GL_RGB,GL_UNSIGNED_BYTE, NULL);
}

//init FBO
glGenFramebuffersEXT(1, &fbo_shadow);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,fbo_shadow);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_RECTANGLE_ARB, m_shadowmaps[0], 0);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,GL_COLOR_ATTACHMENT1_EXT, GL_TEXTURE_RECTANGLE_ARB, m_shadowmaps[1], 0);
glDrawBuffers (2,{GL_COLOR_ATTACHMENT0_EXT,GL_COLOR_ATTACHMENT1_EXT});

Now, even if i use something like

gl_FragData[0] = vec4(0.5, 0.0, 0.0, 1.0);
gl_FragData[1] = vec4(0.0, 0.0, 0.5, 1.0);

in my fragment shader, the resulting textures are always yellowish green or some other ugly color, no matter what values i use for gl_FragData.
Any help would be greatly appreciated.

Your setup is ok.
Just to be sure:
No glErrors?
You are using texture coordinates in the range [320, 240] and not [0.0, 1.0]?
Try glGetTexImage to check the data in the texture.

Simple sanity check: You can use glClear with a specific glClearColor to test whether you’re able to write to those textures at all. That will give you a better idea where the problem is.

First, thanks for the fast replies and its good to know that at least my setup is correct
I want to use the resulting textures as depth maps to check for occlusion in another shader using projective texturing.
I am setting the viewport to the same size as the textures before rendering to the framebuffer, that should result in the correct coordinates or am i completly wrong here?
I was getting a couple gl_invalid_operation errors when i was using display lists, but not using them got rid of that.
But i will check that again tomorrow and try out your suggestions.

Setting the viewport to the size of the texture should be fine if you’re rendering to them by drawing a screen quad. The origin being 0,0 is the important part; then the width and height will just behave like a scissor test.

Make sure you’ve got your orthographic projection set up right if you’re doing that, of course.

You should update your drivers the 93xx series is very old