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List:       mesa3d-dev
Subject:    Re: [Mesa3d-dev] Assertion failure in _swrast_clear_depth_buffer
From:       Brian Paul <brianp () vmware ! com>
Date:       2009-02-26 21:47:27
Message-ID: 49A70DEF.4080103 () vmware ! com
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Ian Romanick wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
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> 
> I'm hitting an assertion failure in _swrast_clear_depth_buffer:
> 
>    assert(rb->_BaseFormat == GL_DEPTH_COMPONENT);
> 
> I debugged it, and rb->_BaseFormat is GL_DEPTH_STENCIL.  Before I dig
> too deep, is this the right place for GL_DEPTH_COMPONENT buffers to end
> up?  Is the assertion just bad?  The code doesn't look like it would
> handle interleaved depth / stencil buffers.  Halp plz?

The assertion is correct.

Combined depth/stencil buffers get "wrapped" by two gl_renderbuffer 
adaptors, one that makes the buffer look like a depth buffer, another 
one that makes the buffer look like a stencil buffer.

See comments in depthstencil.c

These adaptors/wrappers are created during framebuffer validation.  See 
_mesa_update_depth_buffer() and _mesa_update_stencil_buffer().

For your failed assertion, it looks like the renderbuffer wrappers 
aren't being created, or ctx->DrawBuffer->_DepthBuffer is pointing to 
the wrong type of renderbuffer.

-Brian


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