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If stencil is enabled then we need to load the z_dst, even if depth
testing is disabled.
This fixes reflect mesa demo.
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Together with the previous commit, this generalize the benefits of
d2cf757f44f4ee5554243f3279483a25886d9927 to all depth formats, in
particular:
- simpler float -> 24unorm conversion
- avoid unsigned comparisons (not directly supported on SSE) by aligning
to the least significant bit
- avoid unecessary/repeated mask ANDing
Verified with trivial/tri-z that the exact same assembly is produced for
X8Z24.
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Z32_FLOAT uses <4 x float> as intermediate/destination type,
instead of <4 x i32>.
The necessary bitcasts got removed with commit
5b7eb868fde98388d80601d8dea39e679828f42f
Also use depth/stencil type and build contexts consistently, and
make the depth pointer argument a ordinary <i8 *>, to catch this
sort of issues in the future (and also to pave way for Z16 and
Z32_FLOAT_S8_X24 support).
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Specifically, can do early-depth-test even when alpahtest or
kill-pixel are active, providing we defer the actual z write until the
final mask is avaialable.
Improves demos/fire.c especially in the case where you get close to
the trees.
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Don't branch more than once in quick succession. Don't branch at the
end of the shader.
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Avoid unnecessary masking of non-existant stencil component.
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Fixes fdo 29269.
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OpenGL occlusion queries work now. The Mesa demos, glean test and piglit
tests all pass. A few enhancements are possible in the future. -Brian
Signed-off-by: Brian Paul <brianp@vmware.com>
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If both Z-test and stencil-test were enabled, we were mis-computing
the vector of updated Z buffer values.
Fixes Z testing bug in progs/demos/fbotexture.c
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This is specific to the llvmpipe driver and not re-usable.
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the llvmpipe tgsi translation is a lot more complete than what was in
gallivm so replacing the latter with the former. this is needed since
the draw llvm paths will use the same code. effectively the proven
llvmpipe code becomes gallivm.
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This was redundant as drivers can just keep track of whether they are
inside a begin/end query pair. We want to add more query types later
and also support nested queries, none of which map well onto a flag like
this. No driver appeared to be using the flag.
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Union not worth the hassle of violating C99 or adding a name to
the structure.
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Fixes depth test for 24bit depth formats.
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More obvious name.
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Description/rationale/to-do items, while I still remember them...
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