render to texture (pBuffer) with fragment shader ?
Author
Hi,
I'm trying to render to a pBuffer using a fragment shader
and I end up having a crash ...
I do the following :
create pBuffer
some openGL calls
copy pBuffer to ram using glReadPixels
that works fine without the fragment shader,
but if i add glUseFragmentProgram(_shader_Fragment_Program);
before my openGL calls, the glReadPixel crashes ...
I reduced my fragment shader to a simple gl_FragColor = vec4(0,1,0,1);
for test purposes ...
I also use rectangle texture via the NV/ARB extension.
anyone has any idea ?
Thanks a lot !
If you are going to use a lot of render to texture, shaders and various buffer objects, then i suggest that you drop the p-buffer and use FBO instead.
It's much more flexible and you don't have to worry about textures and programs being attached to the right context.
It's much more flexible and you don't have to worry about textures and programs being attached to the right context.
Author
thanks for the answers,
it was my problem didn't share my program...
works fine now with wglShareLists in it
is the FBO supported by NV and ATI ?
and what speed can i expect when copying from
an FBO to cpu memory ?
Thanks a lot !
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