The problem seems to be in st_manager.c:
if (visual->depth_stencil_format != PIPE_FORMAT_NONE) {
mode->haveDepthBuffer = GL_TRUE;
mode->haveStencilBuffer = GL_TRUE;
mode->depthBits =
util_format_get_component_bits(visual->depth_stencil_format,
UTIL_FORMAT_COLORSPACE_ZS, 0);
mode->stencilBits =
util_format_get_component_bits(visual->depth_stencil_format,
UTIL_FORMAT_COLORSPACE_ZS, 1);
}
This sets haveStencilBuffer even for depth-only buffers.
How about fixing this to set haveDepthBuffer and haveStencilBuffer
only if bits > 0, and later removing haveStencilBuffer,
haveDepthBuffer and haveAccumBuffer in favor of just testing the *bits
counterparts?
BTW, what if we have a floating-point depth buffer, or, say, a shared
exponent floating-point color buffer? How do we represent that with
the visual structure?
Shouldn't we be using the actual formats instead of this *bits stuff,
maybe by having Mesa look at its internal structures instead of a
GLXVisual-like struct?
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