From: Dave Airlie <airl...@redhat.com>
This is prep work for reusing this in the interpolation
code later.
Signed-off-by: Dave Airlie <airl...@redhat.com>
---
src/gallium/drivers/radeonsi/si_shader.c | 44 +++++++++++++++++++-------------
1 file changed, 26 insertions(+), 18 deletions(-)
diff --git a/src/gallium/drivers/radeonsi/si_shader.c
b/src/gallium/drivers/radeonsi/si_shader.c
index 75a29ae..22fb983 100644
--- a/src/gallium/drivers/radeonsi/si_shader.c
+++ b/src/gallium/drivers/radeonsi/si_shader.c
@@ -595,6 +595,31 @@ static LLVMValueRef buffer_load_const(LLVMBuilderRef
builder, LLVMValueRef resou
LLVMReadNoneAttribute | LLVMNoUnwindAttribute);
}
+static LLVMValueRef load_sample_position(struct radeon_llvm_context
*radeon_bld, LLVMValueRef sample_id)
+{
+ struct si_shader_context *si_shader_ctx =
+ si_shader_context(&radeon_bld->soa.bld_base);
+ struct lp_build_context *uint_bld = &radeon_bld->soa.bld_base.uint_bld;
+ struct gallivm_state *gallivm = &radeon_bld->gallivm;
+ LLVMBuilderRef builder = gallivm->builder;
+ LLVMValueRef desc = LLVMGetParam(si_shader_ctx->radeon_bld.main_fn,
SI_PARAM_CONST);
+ LLVMValueRef buf_index = lp_build_const_int32(gallivm,
SI_DRIVER_STATE_CONST_BUF);
+ LLVMValueRef resource = build_indexed_load_const(si_shader_ctx, desc,
buf_index);
+
+ /* offset = sample_id * 8 (8 = 2 floats containing samplepos.xy) */
+ LLVMValueRef offset0 = lp_build_mul_imm(uint_bld, sample_id, 8);
+ LLVMValueRef offset1 = LLVMBuildAdd(builder, offset0,
lp_build_const_int32(gallivm, 4), "");
+
+ LLVMValueRef pos[4] = {
+ buffer_load_const(builder, resource, offset0,
radeon_bld->soa.bld_base.base.elem_type),
+ buffer_load_const(builder, resource, offset1,
radeon_bld->soa.bld_base.base.elem_type),
+ lp_build_const_float(gallivm, 0),
+ lp_build_const_float(gallivm, 0)
+ };
+
+ return lp_build_gather_values(gallivm, pos, 4);
+}
+
static void declare_system_value(
struct radeon_llvm_context * radeon_bld,
unsigned index,
@@ -640,25 +665,8 @@ static void declare_system_value(
break;
case TGSI_SEMANTIC_SAMPLEPOS:
- {
- LLVMBuilderRef builder = gallivm->builder;
- LLVMValueRef desc =
LLVMGetParam(si_shader_ctx->radeon_bld.main_fn, SI_PARAM_CONST);
- LLVMValueRef buf_index = lp_build_const_int32(gallivm,
SI_DRIVER_STATE_CONST_BUF);
- LLVMValueRef resource = build_indexed_load_const(si_shader_ctx,
desc, buf_index);
-
- /* offset = sample_id * 8 (8 = 2 floats containing
samplepos.xy) */
- LLVMValueRef offset0 = lp_build_mul_imm(uint_bld,
get_sample_id(radeon_bld), 8);
- LLVMValueRef offset1 = LLVMBuildAdd(builder, offset0,
lp_build_const_int32(gallivm, 4), "");
-
- LLVMValueRef pos[4] = {
- buffer_load_const(builder, resource, offset0,
radeon_bld->soa.bld_base.base.elem_type),
- buffer_load_const(builder, resource, offset1,
radeon_bld->soa.bld_base.base.elem_type),
- lp_build_const_float(gallivm, 0),
- lp_build_const_float(gallivm, 0)
- };
- value = lp_build_gather_values(gallivm, pos, 4);
+ value = load_sample_position(radeon_bld,
get_sample_id(radeon_bld));
break;
- }
case TGSI_SEMANTIC_SAMPLEMASK:
/* Smoothing isn't MSAA in GL, but it's MSAA in hardware.
--
2.4.3
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