fdo-mirrors/mesa
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/mesa/mesa.git synced 2025-12-25 17:20:10 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions

llvmpipe: add multisample alpha to coverage support.

Browse source 
Converts alpha into coverage mask.

Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4122>
This commit is contained in:
Dave Airlie 2020-03-20 19:28:59 +10:00 • committed by Marge Bot
parent 38e81938b6
commit 66a92e5d92
1 changed files with 35 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

38
src/gallium/drivers/llvmpipe/lp_state_fs.c
View file

@ -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);
}
}
}