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r600g: use a select to handle front/back color in llvm

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Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
This commit is contained in:
Vincent Lejeune 2012-09-23 19:46:53 +02:00
parent 80663cb185
commit 11e08f42e4
2 changed files with 44 additions and 5 deletions
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36
src/gallium/drivers/r600/r600_llvm.c
View file

@ -86,6 +86,42 @@ static void llvm_load_input(
"llvm.R600.load.input",
ctx->soa.bld_base.base.elem_type, &reg, 1,
LLVMReadNoneAttribute);
if (decl->Semantic.Name == TGSI_SEMANTIC_COLOR && ctx->two_side) {
unsigned back_reg = ctx->r600_inputs[input_index]
.potential_back_facing_reg;
unsigned back_soa_index = radeon_llvm_reg_index_soa(
ctx->r600_inputs[back_reg].gpr
, chan);
LLVMValueRef backcolor_reg = lp_build_const_int32(
ctx->soa.bld_base.base.gallivm,
back_soa_index);
LLVMValueRef backcolor = build_intrinsic(
ctx->soa.bld_base.base.gallivm->builder,
"llvm.R600.load.input",
ctx->soa.bld_base.base.elem_type, &backcolor_reg, 1,
LLVMReadNoneAttribute);
LLVMValueRef face_reg = lp_build_const_int32(
ctx->soa.bld_base.base.gallivm,
ctx->face_input * 4);
LLVMValueRef face = build_intrinsic(
ctx->soa.bld_base.base.gallivm->builder,
"llvm.R600.load.input",
ctx->soa.bld_base.base.elem_type,
&face_reg, 1,
LLVMReadNoneAttribute);
LLVMValueRef is_face_positive = LLVMBuildFCmp(
ctx->soa.bld_base.base.gallivm->builder,
LLVMRealUGT, face,
lp_build_const_float(ctx->soa.bld_base.base.gallivm, 0.0f),
"");
ctx->inputs[soa_index] = LLVMBuildSelect(
ctx->soa.bld_base.base.gallivm->builder,
is_face_positive,
ctx->inputs[soa_index],
backcolor,
"");
}
}
}

13
src/gallium/drivers/r600/r600_shader.c
View file

@ -1128,7 +1128,7 @@ static int tgsi_split_literal_constant(struct r600_shader_ctx *ctx)
return 0;
}
static int process_twoside_color_inputs(struct r600_shader_ctx *ctx)
static int process_twoside_color_inputs(struct r600_shader_ctx *ctx, unsigned use_llvm)
{
int i, r, count = ctx->shader->ninput;
@ -1139,9 +1139,12 @@ static int process_twoside_color_inputs(struct r600_shader_ctx *ctx)
if ((r = evergreen_interp_input(ctx, back_facing_reg)))
return r;
}
r = select_twoside_color(ctx, i, back_facing_reg);
if (r)
return r;
if (!use_llvm) {
r = select_twoside_color(ctx, i, back_facing_reg);
if (r)
return r;
}
}
}
return 0;
@ -1402,7 +1405,7 @@ static int r600_shader_from_tgsi(struct r600_screen *rscreen,
}
if (shader->two_side && ctx.colors_used) {
if ((r = process_twoside_color_inputs(&ctx)))
if ((r = process_twoside_color_inputs(&ctx, use_llvm)))
return r;
}