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radv: do not use an user SGPR for the sample position offset

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We know the number of samples at compile time.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
This commit is contained in:
Samuel Pitoiset
2018-06-19 14:25:48 +02:00
parent 20170865db
commit 70c1bee187
3 changed files with 30 additions and 40 deletions
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40
src/amd/vulkan/radv_nir_to_llvm.c
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@@ -81,7 +81,6 @@ struct radv_shader_context {
LLVMValueRef hs_ring_tess_offchip;
LLVMValueRef hs_ring_tess_factor;
LLVMValueRef sample_pos_offset;
LLVMValueRef persp_sample, persp_center, persp_centroid;
LLVMValueRef linear_sample, linear_center, linear_centroid;
@@ -1095,10 +1094,6 @@ static void create_function(struct radv_shader_context *ctx,
previous_stage, &user_sgpr_info,
&args, &desc_sets);
if (ctx->shader_info->info.ps.needs_sample_positions)
add_arg(&args, ARG_SGPR, ctx->ac.i32,
&ctx->sample_pos_offset);
add_arg(&args, ARG_SGPR, ctx->ac.i32, &ctx->abi.prim_mask);
add_arg(&args, ARG_VGPR, ctx->ac.v2i32, &ctx->persp_sample);
add_arg(&args, ARG_VGPR, ctx->ac.v2i32, &ctx->persp_center);
@@ -1194,10 +1189,6 @@ static void create_function(struct radv_shader_context *ctx,
set_loc_shader(ctx, AC_UD_VIEW_INDEX, &user_sgpr_idx, 1);
break;
case MESA_SHADER_FRAGMENT:
if (ctx->shader_info->info.ps.needs_sample_positions) {
set_loc_shader(ctx, AC_UD_PS_SAMPLE_POS_OFFSET,
&user_sgpr_idx, 1);
}
break;
default:
unreachable("Shader stage not implemented");
@@ -1627,6 +1618,30 @@ static LLVMValueRef lookup_interp_param(struct ac_shader_abi *abi,
return NULL;
}
static uint32_t
radv_get_sample_pos_offset(uint32_t num_samples)
{
uint32_t sample_pos_offset = 0;
switch (num_samples) {
case 2:
sample_pos_offset = 1;
break;
case 4:
sample_pos_offset = 3;
break;
case 8:
sample_pos_offset = 7;
break;
case 16:
sample_pos_offset = 15;
break;
default:
break;
}
return sample_pos_offset;
}
static LLVMValueRef load_sample_position(struct ac_shader_abi *abi,
LLVMValueRef sample_id)
{
@@ -1638,7 +1653,12 @@ static LLVMValueRef load_sample_position(struct ac_shader_abi *abi,
ptr = LLVMBuildBitCast(ctx->ac.builder, ptr,
ac_array_in_const_addr_space(ctx->ac.v2f32), "");
sample_id = LLVMBuildAdd(ctx->ac.builder, sample_id, ctx->sample_pos_offset, "");
uint32_t sample_pos_offset =
radv_get_sample_pos_offset(ctx->options->key.fs.num_samples);
sample_id =
LLVMBuildAdd(ctx->ac.builder, sample_id,
LLVMConstInt(ctx->ac.i32, sample_pos_offset, false), "");
result = ac_build_load_invariant(&ctx->ac, ptr, sample_id);
return result;