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I'm writing an OpenGL application for Windows, and experiencing some difficulties on Intel HD. The test machine is Windows 7 64-bit, HD 4600 (9.18.10.3165).
For some reason it is impossible to read the content of offscreene FBO with glReadPixels.
......
ActiveTexture(GL_TEXTURE0+4);
glBindTexture(GL_TEXTURE_2D_ARRAY, tex_ms);
TexImage3D(GL_TEXTURE_2D_ARRAY, 0, GL_RGBA32F, mww, mhh, 1+detail_l, 0, GL_RGBA, GL_FLOAT, 0); // viewport width & height
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAX_LEVEL, 0);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
result = glGetError();
if (!result) {
GenFramebuffers(1, &builder_frame);
BindFramebuffer(GL_DRAW_FRAMEBUFFER, builder_frame);
BindFramebuffer(GL_READ_FRAMEBUFFER, builder_frame);
for (int ii(0);ii<=detail_l;ii++) FramebufferTextureLayer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0+ii, tex_ms, 0, ii);
glReadBuffer(GL_COLOR_ATTACHMENT0);
}
result |= (CheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE);
....
some rendering
...
float selection_vals[16];
glReadPixels(po_x, po_y, 1, 1, GL_RGBA, GL_FLOAT, selection_vals);
...
glGetError returns no_error, and selection_vals are not updated. And the same code works fine on AMD and Nvidia.
I have to mention that when read framebuffer changed to default framebuffer, glReadPixels works as it is suppose to.
So, how to resove the situation?
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I am also having this problem. I have an Intel HD 4600 with the latest drivers. I am getting an OpenGL Debug message back from the ig75icd32.dll of a GL_INVALID_OPERATION and a GLError 1282 is on the error stack.
One difference is I am using RenderBuffers not TextureBuffers.
I have this posted in https://communities.intel.com/message/263941. My code snippets have been reviewed as OK.
This code also works fine with NVIDEA and AMD cards.
I would like my code to work on Intel hardware so I can recommend this hardware for users of our software.
I note there has been no feedback on this since you posted in 2013. Have you resolved it??
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Hi,
We recently created a sub forum for reporting suspecting driver issues. I am moving thread there. Also you will see a sticky post I created about reported graphics driver issues. If you provide the information in the format provided I can quickly create an internal ticket and discuss the issues with our OpenGL developers.
-Michael
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