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i965: fold offset into coord for textureOffset(gsampler2DRect)

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The hardware is broken with nonzero texel offsets and unnormalized
coordinates; instead of doing correct offsetting, we get garbage.

This just extends the existing workaround for ir_txf and
ir_tg4+gsampler2DRect to also consider ir_tex+gsampler2DRect.

Fixes broken rendering in 'tesseract' when 'mesa_texrectoffset_bug' is
not enabled; also fixes the new piglit test
'tests/spec/glsl-1.30/execution/fs-textureOffset-Rect'.

Has been broken ~forever; suggesting including this in only 10.0 because
the lowering pass doesn't exist in 9.2 or earlier so would require quite
a different patch.

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Cc: Lee Salzman <lsalzman@gmail.com>
Cc: "10.0" <mesa-stable@lists.freedesktop.org>
(cherry picked from commit 9e99735f30)
This commit is contained in:
Chris Forbes 2013-12-18 21:27:59 +13:00 • committed by Carl Worth
parent 2b205f2864
commit c24489b0ef
1 changed files with 1 additions and 1 deletions
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2
src/mesa/drivers/dri/i965/brw_lower_unnormalized_offset.cpp
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@ -55,7 +55,7 @@ brw_lower_unnormalized_offset_visitor::visit_leave(ir_texture *ir)
if (!ir->offset)
return visit_continue;
if (ir->op == ir_tg4) {
if (ir->op == ir_tg4 || ir->op == ir_tex) {
if (ir->sampler->type->sampler_dimensionality != GLSL_SAMPLER_DIM_RECT)
return visit_continue;
}