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Thread: glCopyTexSubImage3D issue with mutlisample FBO

  1. #1
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    Nov 2012
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    glCopyTexSubImage3D issue with mutlisample FBO

    I am updating an application to use a full-screen FBO as its render-target, under an OpenGL 3.2 context with Nvidia 306.97 drivers and a gtx680m.

    Some previously working code is now generated a GL_INVALID_OPERATION error:

    [Error] from OpenGL with Severity: High -- ID: 1282
    Message: GL_INVALID_OPERATION error generated. Copy is invalid when anti-aliasing is enabled on the current read buffer.

    The code this leads me to (up the stack from our debug callback) is:

    Code :
    glBindTexture( GL_TEXTURE_2D_ARRAY, texture_d )
     
    glCopyTexSubImage3D( GL_TEXTURE_2D_ARRAY, miplevel, 0, 0, layer, SUBLOAD_OFFSET, SUBLOAD_OFFSET, RESOLUTION >> miplevel, RESOLUTION >> miplevel );
     
    glBindTexture( GL_TEXTURE_2D_ARRAY, 0 );

    From the documentation the only time I can see that an invalid operation should be generated is in the case that the texture has not been allocated with a call to glTexImage3D which I have verified via gdebugger.

    Has anyone else run into this issue? Is it a driver bug, or am I missing something else?

  2. #2
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    Join Date
    Nov 2012
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    Upon re-reading the specification I noticed that glCopyTexSubImage3D performs its copy as if glReadPixels had been called, and glReadPixels will in fact generate an invalid operation in the case that I mentioned above.

    For others' reference in the future the case is the following:

    GL_INVALID_OPERATION is generated if GL_READ_FRAMEBUFFER_BINDING
    is non-zero, the read framebuffer is complete, and the value of GL_SAMPLE_BUFFERS
    for the read framebuffer is greater than zero.

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