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i965: Re-enable the -RHW workaround for original gen4 chips.

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Fixes broken clipping in supertuxkart and presumably many other applications.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=51471
NOTE: Candidate for the stable branches.
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Eric Anholt
2013-02-06 15:22:45 -08:00
parent ddc2b453d0
commit cb4616d32d
1 changed files with 8 additions and 12 deletions
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src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
+8 -12
View File
@@ -2420,18 +2420,14 @@ vec4_visitor::emit_psiz_and_flags(struct brw_reg reg)
* clipped against all fixed planes.
*/
if (brw->has_negative_rhw_bug) {
#if 0
/* FINISHME */
brw_CMP(p,
vec8(brw_null_reg()),
BRW_CONDITIONAL_L,
brw_swizzle1(output_reg[BRW_VERT_RESULT_NDC], 3),
brw_imm_f(0));
brw_OR(p, brw_writemask(header1, WRITEMASK_W), header1, brw_imm_ud(1<<6));
brw_MOV(p, output_reg[BRW_VERT_RESULT_NDC], brw_imm_f(0));
brw_set_predicate_control(p, BRW_PREDICATE_NONE);
#endif
src_reg ndc_w = src_reg(output_reg[BRW_VERT_RESULT_NDC]);
ndc_w.swizzle = BRW_SWIZZLE_WWWW;
emit(CMP(dst_null_f(), ndc_w, src_reg(0.0f), BRW_CONDITIONAL_L));
vec4_instruction *inst;
inst = emit(OR(header1_w, src_reg(header1_w), src_reg(1u << 6)));
inst->predicate = BRW_PREDICATE_NORMAL;
inst = emit(MOV(output_reg[BRW_VERT_RESULT_NDC], src_reg(0.0f)));
inst->predicate = BRW_PREDICATE_NORMAL;
}
emit(MOV(retype(reg, BRW_REGISTER_TYPE_UD), src_reg(header1)));