diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/gallium/drivers/llvmpipe/lp_state_fs.c | 38 |
1 files changed, 35 insertions, 3 deletions
diff --git a/src/gallium/drivers/llvmpipe/lp_state_fs.c b/src/gallium/drivers/llvmpipe/lp_state_fs.c index 7a35960c3c3..15ec9048052 100644 --- a/src/gallium/drivers/llvmpipe/lp_state_fs.c +++ b/src/gallium/drivers/llvmpipe/lp_state_fs.c @@ -293,6 +293,32 @@ lp_build_depth_clamp(struct gallivm_state *gallivm, return lp_build_clamp(&f32_bld, z, min_depth, max_depth); } +static void +lp_build_sample_alpha_to_coverage(struct gallivm_state *gallivm, + struct lp_type type, + unsigned coverage_samples, + LLVMValueRef num_loop, + LLVMValueRef loop_counter, + LLVMValueRef coverage_mask_store, + LLVMValueRef alpha) +{ + struct lp_build_context bld; + LLVMBuilderRef builder = gallivm->builder; + float step = 1.0 / coverage_samples; + + lp_build_context_init(&bld, gallivm, type); + for (unsigned s = 0; s < coverage_samples; s++) { + LLVMValueRef alpha_ref_value = lp_build_const_vec(gallivm, type, step * s); + LLVMValueRef test = lp_build_cmp(&bld, PIPE_FUNC_GREATER, alpha, alpha_ref_value); + + LLVMValueRef s_mask_idx = LLVMBuildMul(builder, lp_build_const_int32(gallivm, s), num_loop, ""); + s_mask_idx = LLVMBuildAdd(builder, s_mask_idx, loop_counter, ""); + LLVMValueRef s_mask_ptr = LLVMBuildGEP(builder, coverage_mask_store, &s_mask_idx, 1, ""); + LLVMValueRef s_mask = LLVMBuildLoad(builder, s_mask_ptr, ""); + s_mask = LLVMBuildAnd(builder, s_mask, test, ""); + LLVMBuildStore(builder, s_mask, s_mask_ptr); + } +} /** * Generate the fragment shader, depth/stencil test, and alpha tests. @@ -653,9 +679,15 @@ generate_fs_loop(struct gallivm_state *gallivm, if (color0 != -1 && outputs[color0][3]) { LLVMValueRef alpha = LLVMBuildLoad(builder, outputs[color0][3], "alpha"); - lp_build_alpha_to_coverage(gallivm, type, - &mask, alpha, - (depth_mode & LATE_DEPTH_TEST) != 0); + if (!key->multisample) { + lp_build_alpha_to_coverage(gallivm, type, + &mask, alpha, + (depth_mode & LATE_DEPTH_TEST) != 0); + } else { + lp_build_sample_alpha_to_coverage(gallivm, type, key->coverage_samples, num_loop, + loop_state.counter, + mask_store, alpha); + } } } |