Dave Airlie [Tue, 5 Oct 2010 23:33:23 +0000 (09:33 +1000)]
mesa: add support for FRAG_RESULT_STENCIL.
this is needed to add support for stencil shader export.
Signed-off-by: Dave Airlie <airlied@redhat.com>
Dave Airlie [Thu, 7 Oct 2010 05:34:31 +0000 (15:34 +1000)]
gallium/util: add S8 tile sampling support.
Dave Airlie [Thu, 7 Oct 2010 06:14:59 +0000 (16:14 +1000)]
gallium/format: add X32_S8X24_USCALED format.
Has similiar use cases to the S8X24 and X24S8 formats.
Dave Airlie [Tue, 5 Oct 2010 23:30:17 +0000 (09:30 +1000)]
gallium/format: add support for X24S8 and S8X24 formats.
these formats are needed for hw that can sample and write stencil values.
Signed-off-by: Dave Airlie <airlied@redhat.com>
Dave Airlie [Tue, 5 Oct 2010 23:28:46 +0000 (09:28 +1000)]
gallium/tgsi: add support for stencil writes.
this adds the capability + a stencil semantic id, + tgsi scan support.
Signed-off-by: Dave Airlie <airlied@redhat.com>
Eric Anholt [Tue, 12 Oct 2010 21:39:12 +0000 (14:39 -0700)]
i965: Don't rebase the index buffer to min 0 if any arrays are in VBOs.
There was a check to only do the rebase if we didn't have everything
in VBOs, but nexuiz apparently hands us a mix of VBOs and arrays,
resulting in blocking on the GPU to do a rebase.
Improves nexuiz 800x600, high-settings performance on my Ironlake 41%
(+/- 1.3%), from 14.0fps to 19.7fps.
Eric Anholt [Tue, 12 Oct 2010 21:08:00 +0000 (14:08 -0700)]
intel: Allow CopyTexSubImage to InternalFormat 3/4 textures, like RGB/RGBA.
The format selection of the CopyTexSubImage is pretty bogus still, but
this at least avoids software fallbacks in nexuiz, bringing
performance from 7.5fps to 12.8fps on my machine.
Eric Anholt [Tue, 12 Oct 2010 18:36:56 +0000 (11:36 -0700)]
i965: Fix missing "break;" in i2b/f2b, and missing AND of CMP result.
Fixes glsl-fs-i2b.
Ian Romanick [Tue, 12 Oct 2010 19:50:29 +0000 (12:50 -0700)]
glsl: Fix incorrect assertion
This assertion was added in commit
f1c1ee11, but it did not notice
that the array is accessed with 'size-1' instead of 'size'. As a
result, the assertion was off by one. This caused failures in at
least glsl-orangebook-ch06-bump.
Ian Romanick [Tue, 12 Oct 2010 17:51:47 +0000 (10:51 -0700)]
mesa: Validate assembly shaders when GLSL shaders are used
If an GLSL shader is used that does not provide all stages and
assembly shaders are provided for the missing stages, validate the
assembly shaders.
Fixes bugzilla #30787 and piglit tests glsl-invalid-asm0[12].
NOTE: this is a candidate for the 7.9 branch.
Keith Whitwell [Tue, 12 Oct 2010 17:26:41 +0000 (18:26 +0100)]
llvmpipe: make sure intrinsics code is guarded with PIPE_ARCH_SSE
Thomas Hellstrom [Tue, 12 Oct 2010 16:22:36 +0000 (18:22 +0200)]
st/xorg: Fix typo
Pointed out by Jakob Bornecrantz.
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Brian Paul [Tue, 12 Oct 2010 15:26:39 +0000 (09:26 -0600)]
ir_to_mesa: assorted clean-ups, const qualifiers, new comments
José Fonseca [Tue, 12 Oct 2010 15:07:38 +0000 (16:07 +0100)]
gallivm: Name anonymous union.
Brian Paul [Tue, 12 Oct 2010 14:54:54 +0000 (08:54 -0600)]
st/xlib: add some comments
Brian Paul [Tue, 12 Oct 2010 14:54:16 +0000 (08:54 -0600)]
glsl2: fix signed/unsigned comparison warning
José Fonseca [Tue, 12 Oct 2010 13:15:59 +0000 (14:15 +0100)]
llmvpipe: improve mm_mullo_epi32
Apply Jose's suggestions for a small but measurable improvement in
isosurf.
Thomas Hellstrom [Tue, 12 Oct 2010 09:10:59 +0000 (11:10 +0200)]
st/xorg: Don't try to remove invalid fbs
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Thomas Hellstrom [Tue, 12 Oct 2010 12:10:50 +0000 (14:10 +0200)]
xorg/vmwgfx: Don't hide HW cursors when updating them
Gets rid of annoying cursor flicker
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Thomas Hellstrom [Tue, 12 Oct 2010 09:59:45 +0000 (11:59 +0200)]
st/xorg: Add a customizer option to get rid of annoying cursor update flicker
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Thomas Hellstrom [Tue, 12 Oct 2010 09:07:38 +0000 (11:07 +0200)]
xorg/vmwgfx: Make vmwarectrl work also on 64-bit servers
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Thomas Hellstrom [Tue, 12 Oct 2010 08:26:07 +0000 (10:26 +0200)]
st/xorg: Don't try to use option values before processing options
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Keith Whitwell [Tue, 12 Oct 2010 12:20:39 +0000 (13:20 +0100)]
Revert "llvmpipe: try to keep plane c values small"
This reverts commit
9773722c2b09d5f0615a47cecf4347859474dc56.
Looks like there are some floor/rounding issues here that need
to be better understood.
Keith Whitwell [Sun, 10 Oct 2010 07:39:48 +0000 (08:39 +0100)]
gallivm: don't branch on KILLs near end of shader
Keith Whitwell [Tue, 5 Oct 2010 22:15:44 +0000 (23:15 +0100)]
r600g: add missing file to sconscript
Keith Whitwell [Tue, 12 Oct 2010 12:02:28 +0000 (13:02 +0100)]
gallium: move sse intrinsics debug helpers to u_sse.h
José Fonseca [Tue, 12 Oct 2010 11:27:55 +0000 (12:27 +0100)]
llvmpipe: Fix MSVC build.
MSVC doesn't accept more than 3 __m128i arguments.
Keith Whitwell [Tue, 12 Oct 2010 10:51:28 +0000 (11:51 +0100)]
llvmpipe: fix typo in last commit
Keith Whitwell [Tue, 12 Oct 2010 10:02:19 +0000 (11:02 +0100)]
llvmpipe: try to keep plane c values small
Avoid accumulating more and more fixed point bits.
Keith Whitwell [Mon, 11 Oct 2010 17:20:02 +0000 (18:20 +0100)]
llvmpipe: add debug helpers for epi32 etc
Keith Whitwell [Mon, 11 Oct 2010 15:30:14 +0000 (16:30 +0100)]
llvmpipe: try to do more of rast_tri_3_16 with intrinsics
There was actually a large quantity of scalar code in these functions
previously. This tries to move more into intrinsics.
Introduce an sse2 mm_mullo_epi32 replacement to avoid sse4 dependency
in the new rasterization code.
José Fonseca [Mon, 11 Oct 2010 18:45:52 +0000 (19:45 +0100)]
llvmpipe: Do not dispose the execution engine.
The engine is a global owned by gallivm module.
Francisco Jerez [Tue, 28 Sep 2010 20:51:28 +0000 (22:51 +0200)]
nouveau: Get larger push buffers.
Useful to amortize the command submission/reloc overhead (e.g. etracer
goes from 72 to 109 FPS on nv4b).
Francisco Jerez [Sat, 9 Oct 2010 21:26:34 +0000 (23:26 +0200)]
dri/nouveau: Initialize tile_flags when allocating a render target.
Dave Airlie [Mon, 11 Oct 2010 23:41:02 +0000 (09:41 +1000)]
r600g: fix typo in vertex sampling on r600
fixes https://bugs.freedesktop.org/show_bug.cgi?id=30771
Reported-by: Kevin DeKorte
Eric Anholt [Mon, 11 Oct 2010 22:30:58 +0000 (15:30 -0700)]
i965: Always use the new FS backend on gen6.
It's now much more correct for gen6 than the old backend, with just 2
regressions I've found (one of which is common with pre-gen6 and will
be fixed by an array splitting IR pass).
This does leave the old Mesa IR backend getting used still when we
don't have GLSL IR, but the plan is to get GLSL IR input to the driver
for the ARB programs and fixed function by the next release.
Eric Anholt [Mon, 11 Oct 2010 22:24:12 +0000 (15:24 -0700)]
i965: Fix gen6 pixel_[xy] setup to avoid mixing int and float src operands.
Pre-gen6, you could mix int and float just fine. Now, you get goofy
results.
Fixes:
glsl-arb-fragment-coord-conventions
glsl-fs-fragcoord
glsl-fs-if-greater
glsl-fs-if-greater-equal
glsl-fs-if-less
glsl-fs-if-less-equal
Eric Anholt [Mon, 11 Oct 2010 20:56:29 +0000 (13:56 -0700)]
i965: Don't compute-to-MRF in gen6 VS math.
There was code to do this for pre-gen6 already, this just enables it
for gen6 as well.
Eric Anholt [Mon, 11 Oct 2010 20:42:11 +0000 (13:42 -0700)]
i965: Expand uniform args to gen6 math to full registers to get hstride == 1.
This is a hw requirement in math args. This also is inefficient, as
we're calculating the same result 8 times, but then we've been doing
that on pre-gen6 as well. If we're doing math on uniforms, though,
we'd probably be better served by having some sort of mechanism for
precalculating those results into another uniform value to use.
Fixes 7 piglit math tests.
Eric Anholt [Mon, 11 Oct 2010 20:38:38 +0000 (13:38 -0700)]
i965: Don't compute-to-MRF in gen6 math instructions.
Eric Anholt [Mon, 11 Oct 2010 20:30:12 +0000 (13:30 -0700)]
i965: Add a couple of checks for gen6 math instruction limits.
Eric Anholt [Mon, 11 Oct 2010 20:19:47 +0000 (13:19 -0700)]
i965: Don't consider gen6 math instructions to write to MRFs.
This was leftover from the pre-gen6 cleanups. One tests regresses
where compute-to-MRF now occurs.
Chad Versace [Fri, 8 Oct 2010 19:05:02 +0000 (12:05 -0700)]
glsl: Changes in generated file glsl_lexer.cpp
Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Chad Versace [Fri, 8 Oct 2010 19:03:40 +0000 (12:03 -0700)]
glsl: Add lexer rules for uint and uvecN (N=2..4)
Commit for generated file glsl_lexer.cpp follows this commit.
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Chad Versace [Thu, 7 Oct 2010 23:05:39 +0000 (16:05 -0700)]
glsl: Add glsl_type::uvecN_type for N=2,3
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Chad Versace [Thu, 7 Oct 2010 23:04:30 +0000 (16:04 -0700)]
intel_extensions: Add ability to set GLSL version via environment
Add ability to set the GLSL version used by the GLcontext by setting the
environment variable INTEL_GLSL_VERSION. For example,
env INTEL_GLSL_VERSION=130 prog args
If the environment variable is missing, the GLSL versions defaults to 120.
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Daniel Vetter [Sun, 10 Oct 2010 15:04:42 +0000 (17:04 +0200)]
r200: revalidate after radeon_update_renderbuffers
By calling radeon_draw_buffers (which sets the necessary flags
in radeon->NewGLState) and revalidating if NewGLState is non-zero
in r200TclPrimitive. This fixes an assert in libdrm (the color-/
depthbuffer was changed but not yet validated) and and stops the
kernel cs checker from complaining about them (when they're too
small).
Thanks to Mario Kleiner for the hint to call radeon_draw_buffer
(instead of my half-broken hack).
v2: Also fix the swtcl r200 path.
Cc: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Eric Anholt [Fri, 8 Oct 2010 21:00:14 +0000 (14:00 -0700)]
i965: Compute to MRF in the new FS backend.
This didn't produce a statistically significant performance difference
in my demo (n=4) or nexuiz (n=3), but it still seems like a good idea
and is recommended by the HW team.
Eric Anholt [Fri, 8 Oct 2010 22:11:42 +0000 (15:11 -0700)]
i965: Give the FB write and texture opcodes the info on base MRF, like math.
Eric Anholt [Fri, 8 Oct 2010 21:35:34 +0000 (14:35 -0700)]
i965: Give the math opcodes information on base mrf/mrf len.
This is progress towards enabling a compute-to-MRF pass.
Eric Anholt [Sun, 10 Oct 2010 22:42:37 +0000 (15:42 -0700)]
i965: Move FS backend structures to a header.
It's time to start splitting some of this up.
Eric Anholt [Sun, 10 Oct 2010 19:13:35 +0000 (12:13 -0700)]
i965: Reduce register interference checks for changed FS_OPCODE_DISCARD.
While I don't know of any performance changes from this (once extra
reg available out of 128), it makes the generated asm a lot cleaner
looking.
Eric Anholt [Sun, 10 Oct 2010 18:54:05 +0000 (11:54 -0700)]
i965: Split FS_OPCODE_DISCARD into two steps.
Having the single opcode write then read the reg meant that single
instruction opcodes had to consider their source regs to interfere
with their dest regs.
José Fonseca [Thu, 2 Sep 2010 15:30:23 +0000 (16:30 +0100)]
llvmpipe: Use lp_tgsi_info.
José Fonseca [Thu, 2 Sep 2010 14:54:07 +0000 (15:54 +0100)]
gallivm: More detailed analysis of tgsi shaders.
To allow more optimizations, in particular for direct textures.
José Fonseca [Thu, 2 Sep 2010 14:52:44 +0000 (15:52 +0100)]
tgsi: Export some names for some tgsi enums.
Useful to give human legible names in other cases.
José Fonseca [Sun, 22 Aug 2010 16:27:56 +0000 (17:27 +0100)]
gallium: Define C99 restrict keyword where absent.
José Fonseca [Sun, 10 Oct 2010 22:55:24 +0000 (23:55 +0100)]
gallivm: Eliminate unsigned integer arithmetic from texture coordinates.
SSE support for 32bit and 16bit unsigned arithmetic is not complete, and
can easily result in inefficient code.
In most cases signed/unsigned doesn't make a difference, such as for
integer texture coordinates.
So remove uint_coord_type and uint_coord_bld to avoid inefficient
operations to sneak in the future.
José Fonseca [Sun, 10 Oct 2010 22:36:14 +0000 (23:36 +0100)]
llvmpipe: Remove outdated comment about stencil testing.
Dave Airlie [Mon, 11 Oct 2010 06:20:56 +0000 (16:20 +1000)]
r600g: don't run with scissors.
This could probably be done much nicer, I've spent a day chasing
a coherency problem in the kernel, that turned out to be incorrect
scissor setup.
Dave Airlie [Mon, 11 Oct 2010 02:18:05 +0000 (12:18 +1000)]
r600g: add TXL opcode support.
fixes glsl1-2D Texture lookup with explicit lod (Vertex shader)
Dave Airlie [Mon, 11 Oct 2010 01:58:27 +0000 (11:58 +1000)]
r600g: enable vertex samplers.
We need to move the texture sampler resources out of the range of the vertex attribs.
We could probably improve this using an allocator but this is the simple answer for now.
makes mesa-demos/src/glsl/vert-tex work.
Dave Airlie [Fri, 8 Oct 2010 00:17:51 +0000 (10:17 +1000)]
r600g: evergreen has no request size bit in texture word4
Dave Airlie [Thu, 7 Oct 2010 23:51:09 +0000 (09:51 +1000)]
r600g: fix input/output Z export mixup for evergreen.
José Fonseca [Sun, 10 Oct 2010 18:51:35 +0000 (19:51 +0100)]
gallivm: Pass texture coords derivates as scalars.
We end up treating them as scalars in the end, and it saves some
instructions.
José Fonseca [Sun, 10 Oct 2010 18:05:05 +0000 (19:05 +0100)]
gallivm: Use variables instead of Phis in loops.
With this commit all explicit Phi emission is now gone.
José Fonseca [Sun, 10 Oct 2010 17:47:24 +0000 (18:47 +0100)]
gallivm: Allow to disable bri-linear filtering with GALLIVM_DEBUG=no_brilinear runtime option
José Fonseca [Sun, 10 Oct 2010 17:45:14 +0000 (18:45 +0100)]
gallivm: Fix a long standing bug with nested if-then-else emission.
We can't patch true-block at end-if time, as there is no guarantee that
the block at the beginning of the true stanza is the same at the end of
the true stanza -- other control flow elements may have been emitted half
way the true stanza.
Although this bug surfaced recently with the commit to skip mip filtering
when lod is an integer the bug was always there, although probably it
was avoided until now: e.g., cubemap selection nests if-then-else on the
else stanza, which does not suffer from the same problem.
Francisco Jerez [Sat, 9 Oct 2010 23:39:13 +0000 (01:39 +0200)]
dri/nv10: Fake fast Z clears for pre-nv17 cards.
Francisco Jerez [Sat, 9 Oct 2010 23:45:23 +0000 (01:45 +0200)]
dri/nouveau: Minor cleanup.
José Fonseca [Sat, 9 Oct 2010 20:39:14 +0000 (21:39 +0100)]
gallivm: Cleanup the rest of the flow module.
José Fonseca [Sat, 9 Oct 2010 20:14:05 +0000 (21:14 +0100)]
gallivm: Simplify if/then/else implementation.
No need for for a flow stack anymore.
José Fonseca [Sat, 9 Oct 2010 19:26:11 +0000 (20:26 +0100)]
gallivm: Factor out the SI->FP texture size conversion for SoA path too
José Fonseca [Sat, 9 Oct 2010 19:14:03 +0000 (20:14 +0100)]
gallivm: Remove support for Phi generation.
Simply rely on mem2reg pass. It's easier and more reliable.
José Fonseca [Sat, 9 Oct 2010 18:53:21 +0000 (19:53 +0100)]
gallivm: Use varilables instead of Phis for cubemap selection.
José Fonseca [Sat, 9 Oct 2010 11:55:31 +0000 (12:55 +0100)]
gallivm: Don't generate Phis for execution mask.
José Fonseca [Sat, 9 Oct 2010 11:12:03 +0000 (12:12 +0100)]
gallivm: Special bri-linear computation path for unmodified rho.
José Fonseca [Sat, 9 Oct 2010 11:11:20 +0000 (12:11 +0100)]
gallivm: Less code duplication in log computation.
José Fonseca [Sat, 9 Oct 2010 11:10:07 +0000 (12:10 +0100)]
util: Defined M_SQRT2 when not available.
José Fonseca [Sat, 9 Oct 2010 11:08:25 +0000 (12:08 +0100)]
gallivm: Handle code have ret correctly.
Stop disassembling on unconditional backwards jumps.
José Fonseca [Wed, 6 Oct 2010 20:01:38 +0000 (21:01 +0100)]
llvmpipe: Fix MSVC build. Enable the new SSE2 code on non SSE3 systems.
Keith Whitwell [Fri, 1 Oct 2010 14:13:51 +0000 (15:13 +0100)]
llvmpipe: simplified SSE2 swz/unswz routines
We've been using these in the linear path for a while now. Based on
Chris's SSSE3 code, but using only sse2 opcodes. Speed seems to be
identical, but code is simpler & removes dependency on SSE3.
Should be easier to extend to other rgba8 formats.
Keith Whitwell [Sat, 9 Oct 2010 10:28:00 +0000 (11:28 +0100)]
llvmpipe: clean up shader pre/postamble, try to catch more early-z
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.
Keith Whitwell [Thu, 7 Oct 2010 14:01:07 +0000 (15:01 +0100)]
llvmpipe: try to be sensible about whether to branch after mask updates
Don't branch more than once in quick succession. Don't branch at the
end of the shader.
Keith Whitwell [Wed, 6 Oct 2010 18:09:03 +0000 (19:09 +0100)]
gallivm: simpler uint8->float conversions
LLVM seems to finds it easier to reason about these than our
mantissa-manipulation code.
Keith Whitwell [Wed, 6 Oct 2010 18:10:30 +0000 (19:10 +0100)]
gallivm: prefer blendvb for integer arguments
Keith Whitwell [Wed, 6 Oct 2010 17:21:56 +0000 (18:21 +0100)]
gallivm: specialized x8z24 depthtest path
Avoid unnecessary masking of non-existant stencil component.
Keith Whitwell [Thu, 7 Oct 2010 18:01:12 +0000 (19:01 +0100)]
llvmpipe: dump fragment shader ir and asm when LP_DEBUG=fs
Better than GALLIVM_DEBUG if you're only interested in fragment shaders.
Keith Whitwell [Thu, 7 Oct 2010 18:49:20 +0000 (19:49 +0100)]
llvmpipe: store zero into all alloca'd values
Fixes slowdown in isosurf with earlier versions of llvm.
Keith Whitwell [Thu, 7 Oct 2010 17:59:54 +0000 (18:59 +0100)]
llvmpipe: use alloca for fs color outputs
Don't try to emit our own phi's, let llvm mem2reg do it for us.
Keith Whitwell [Wed, 6 Oct 2010 21:25:48 +0000 (22:25 +0100)]
llvmpipe: defer attribute interpolation until after mask and ztest
Don't calculate 1/w for quads which aren't visible...
José Fonseca [Wed, 6 Oct 2010 19:42:30 +0000 (20:42 +0100)]
llvmpipe: Prevent z > 1.0
The current interpolation schemes causes precision loss.
Changing the operation order helps, but does not completely avoid the
problem.
The only short term solution is to clamp z to 1.0.
This is unfortunate, but probably unavoidable until interpolation is
improved.
José Fonseca [Sat, 9 Oct 2010 08:34:31 +0000 (09:34 +0100)]
gallivm: Do size computations simultanously for all dimensions (AoS).
Operate simultanouesly on <width, height, depth> vector as much as possible,
instead of doing the operations on vectors with broadcasted scalars.
Also do the 24.8 fixed point scalar with integer shift of the texture size,
for unnormalized coordinates.
AoS path only for now -- the same thing can be done for SoA.
Zack Rusin [Thu, 7 Oct 2010 20:26:17 +0000 (16:26 -0400)]
llvmpipe: fix rasterization of vertical lines on pixel boundaries
Vinson Lee [Fri, 8 Oct 2010 23:40:29 +0000 (16:40 -0700)]
i965: Initialize member variables.
Fixes these GCC warnings.
brw_wm_fp.c: In function 'search_or_add_const4f':
brw_wm_fp.c:92: warning: 'reg.Index2' is used uninitialized in this function
brw_wm_fp.c:84: note: 'reg.Index2' was declared here
brw_wm_fp.c:92: warning: 'reg.RelAddr2' is used uninitialized in this function
brw_wm_fp.c:84: note: 'reg.RelAddr2' was declared here
Vinson Lee [Fri, 8 Oct 2010 23:30:59 +0000 (16:30 -0700)]
i965: Silence unused variable warning on non-debug builds.
Fixes this GCC warning.
brw_vs.c: In function 'do_vs_prog':
brw_vs.c:46: warning: unused variable 'ctx'
Vinson Lee [Fri, 8 Oct 2010 23:02:59 +0000 (16:02 -0700)]
i965: Silence unused variable warning on non-debug builds.
Fixes this GCC warning.
brw_eu_emit.c: In function 'brw_math2':
brw_eu_emit.c:1189: warning: unused variable 'intel'
Vinson Lee [Fri, 8 Oct 2010 22:49:02 +0000 (15:49 -0700)]
i915: Silence unused variable warning in non-debug builds.
Fixes this GCC warning.
i915_vtbl.c: In function 'i915_assert_not_dirty':
i915_vtbl.c:670: warning: unused variable 'dirty'
Roland Scheidegger [Fri, 8 Oct 2010 22:35:58 +0000 (00:35 +0200)]
gallivm: make use of new iround code in lp_bld_conv.
Only requires sse2 now.
Roland Scheidegger [Fri, 8 Oct 2010 22:14:11 +0000 (00:14 +0200)]
gallivm: optimize soa linear clamp to edge wrap mode a bit
Clamp against 0 instead of -0.5, which simplifies things.
The former version would have resulted in both int coords being zero
(in case of coord being smaller than 0) and some "unused" weight value,
whereas now the int coords will be 0 and 1, but weight will be 0, hence the
lerp should produce the same value.
Still not happy about differences between normalized and non-normalized...