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openglnvidiafboglreadpixelspbo
Bram
Bram

Reputation: 8283

nVidia GL driver states: Texture 0 is base level inconsistent

I am using glDebugMessageCallback to capture the OpenGL driver messages.

When I enable all message sources and severities, my program triggers this message:

Texture state usage warning: Texture 0 is base level inconsistent. Check texture size.

The message is triggered by a glReadPixels call that tries to read depth values from a FBO framebuffer using a PixelBufferObject (PBO.)

The exact glReadPixels call looks like this:

glBindBuffer( GL_PIXEL_PACK_BUFFER, pboid );
glReadPixels( srcx, srcy, 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT, 0 );

And the PBO was created as:

glBindBuffer( GL_PIXEL_PACK_BUFFER, pboid );
glBufferData( GL_PIXEL_PACK_BUFFER, DATA_SIZE, 0, GL_STREAM_READ );

What does the message actually mean? What is "base level consistent?" And what does the level refer to?

The FBO that is being read has a COLOR_ATTACHMENT0 and a DEPTH_ATTACHMENT and is complete.

The color texture (800x640 texels) for the FBO was created with:

glTexImage2D
(
    GL_TEXTURE_2D,
    0,
    GL_RGBA,
    w, h,
    0,
    GL_RGBA,
    GL_UNSIGNED_BYTE,
    0
);

The depth texture (800x640 texels) for the FBO was created with:

GLint internal_fmt = GL_DEPTH_COMPONENT24;
glTexImage2D
(
    GL_TEXTURE_2D,      // target
    0,                  // level
    internal_fmt,       // internal format
    w, h,               // width, height
    0,                  // border
    GL_DEPTH_COMPONENT, // format
    GL_UNSIGNED_INT,    // type
    0                   // pixels
);

glCheckFramebufferStatus(GL_FRAMEBUFFER) returns GL_FRAMEBUFFER_COMPLETE.

glGetError() returns no errors.

OS: Ubuntu LTS

GPU: nVidia GTX750Ti

GL Version: Core Profile 3.3

Driver: NVIDIA 390.116

Upvotes: 0

Views: 609

Answers (0)

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