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i965/vec4: Emit shader w/a for Gen6 gather

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Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Chris Forbes 2014-02-03 22:15:41 +13:00
parent 73b91fe05a
commit 31d1077dd2
2 changed files with 32 additions and 0 deletions
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1
src/mesa/drivers/dri/i965/brw_vec4.h
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@ -482,6 +482,7 @@ public:
uint32_t gather_channel(ir_texture *ir, int sampler);
src_reg emit_mcs_fetch(ir_texture *ir, src_reg coordinate, int sampler);
void emit_gen6_gather_wa(uint8_t wa, dst_reg dst);
void swizzle_result(ir_texture *ir, src_reg orig_val, int sampler);
void emit_ndc_computation();

31
src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
View file

@ -2499,9 +2499,40 @@ vec4_visitor::visit(ir_texture *ir)
}
}
if (brw->gen == 6 && ir->op == ir_tg4) {
emit_gen6_gather_wa(key->tex.gen6_gather_wa[sampler], inst->dst);
}
swizzle_result(ir, src_reg(inst->dst), sampler);
}
/**
* Apply workarounds for Gen6 gather with UINT/SINT
*/
void
vec4_visitor::emit_gen6_gather_wa(uint8_t wa, dst_reg dst)
{
if (!wa)
return;
int width = (wa & WA_8BIT) ? 8 : 16;
dst_reg dst_f = dst;
dst_f.type = BRW_REGISTER_TYPE_F;
/* Convert from UNORM to UINT */
emit(MUL(dst_f, src_reg(dst_f), src_reg((float)((1 << width) - 1))));
emit(MOV(dst, src_reg(dst_f)));
if (wa & WA_SIGN) {
/* Reinterpret the UINT value as a signed INT value by
* shifting the sign bit into place, then shifting back
* preserving sign.
*/
emit(SHL(dst, src_reg(dst), src_reg(32 - width)));
emit(ASR(dst, src_reg(dst), src_reg(32 - width)));
}
}
/**
* Set up the gather channel based on the swizzle, for gather4.
*/