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Fixes a regression from commit 2c30fd84dfa052949a117c78d932b58c1f88b446
seen with DRI1.
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The READ message's msg_control value can be 0 or 1 to indicate that the
Oword should be read into the lower or upper half of the target register.
It seems that the other half of the register gets clobbered though. So
we read into two dest registers then use a MOV to combine the upper/lower
halves.
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Now that we have real constant buffers, the demands on the CURBE are lessened.
When we use real VS/WM constant buffers we only use the CURBE for clip planes.
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Also enable them all regardless of screen bpp, as 32 bpp what I've been
testing against, and haven't been able to detect any screen bpp-specific
troubles with them.
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For some reason, MOV instructions using immediate src values don't seem
to work reliably on the GLSL path. Disable them for now (falling back to
const buffer reads). This fixes a bunch of glean glsl1 failures.
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A scatter-read should be possible, but we're just using two READs for
the time being.
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Calls to release_tmps() were causing the temps holding constants to get
recycled.
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There's really no need for two negation fields. This came from the
GL_NV_fragment_program extension. The new, unified Negate bitfield applies
after the absolute value step.
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This mostly came down to finding the right MRF incantation in the
brw_dp_READ_4_vs() function.
Note: this feature is still disabled (but getting close to done).
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Hook up a constant buffer, binding table, etc for the VS unit.
This will allow using large constant buffers with vertex shaders.
The new code is disabled at this time (use_const_buffer=FALSE).
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Plus, begin the new code for vertex shader const buffers.
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Used to map drawables, textures and constant buffers to surface binding
table indexes.
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Fixes mem leak observed with texcombine test.
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This fixes the random results that were seen when fetching a constant
inside an IF/ELSE clause. Disabling the execution mask ensures that all
the components of the register are written.
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Before, the instruction's CondUpdate field was mistakenly effecting the
constant-fetch operation.
Fixes progs/glsl/bump.c demo. But there are some other issues related
to condition flags and IF/ELSE that need investigation...
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This speeds up OA on my GM45 by 21% (more than the original CPU cost of
the upload path). We might still be able to squeeze a few more percent out
by avoiding repeatedly mapping/unmapping buffers as we upload elements into
them.
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Everything is in place now for using a true constant buffer for GLSL fragment
shaders. Still some bugs to find though.
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We were accidentally clobbering the next register.
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Currently, shader constants are stored in the GRF (loaded from the CURBE
prior to shader execution). This severly limits the number of constants
and temps that we can support.
This new code will support (practically) unlimited size constant buffers
and free up registers in the GRF. We allocate a new buffer object for the
constants and read them with "Read" messages/instructions. When only a
small number of constants are used, we can still use the old method.
The code works for fragment shaders only (and is actually disabled) for now.
Need to do the same thing for vertex shaders and need to add the necessary
code-gen to fetch the constants which are referenced by the shader
instructions.
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This code won't actually be used and will be removed in a subsequent commit.
Just committing for posterity.
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Fixes regression seen with progs/glsl/bump.c
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Used to read float[4] vectors from the constant buffer/surface.
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Call the get_src_reg_imm() function when it's permissible to generate a
literal value src register.
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The value was always 1.
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