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shader_recompiler: Support multiple attributes using the same load in vertex fetch shaders (#3475)

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* Support multiple uses of the same load.

Co-Authored-By: TheTurtle <47210458+raphaelthegreat@users.noreply.github.com>

* Keep base_sgpr as a s32

Requires manually casting to s32 now.

---------

Co-authored-by: TheTurtle <47210458+raphaelthegreat@users.noreply.github.com>
This commit is contained in:
Stephen Miller
2025-08-29 18:06:40 -05:00
committed by GitHub
parent 8ae45559fc
commit 412355aab4
1 changed files with 6 additions and 11 deletions
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17
src/shader_recompiler/frontend/fetch_shader.cpp
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@@ -2,7 +2,6 @@
// SPDX-License-Identifier: GPL-2.0-or-later
#include <algorithm>
#include <boost/container/static_vector.hpp>
#include "common/assert.h"
#include "shader_recompiler/frontend/decode.h"
#include "shader_recompiler/frontend/fetch_shader.h"
@@ -53,9 +52,8 @@ std::optional<FetchShaderData> ParseFetchShader(const Shader::Info& info) {
struct VsharpLoad {
u32 dword_offset{};
s32 base_sgpr{};
s32 dst_reg{-1};
};
boost::container::static_vector<VsharpLoad, 16> loads;
std::array<VsharpLoad, 104> loads{};
u32 semantic_index = 0;
while (!code_slice.atEnd()) {
@@ -67,7 +65,8 @@ std::optional<FetchShaderData> ParseFetchShader(const Shader::Info& info) {
}
if (inst.inst_class == InstClass::ScalarMemRd) {
loads.emplace_back(inst.control.smrd.offset, inst.src[0].code * 2, inst.dst[0].code);
loads[inst.dst[0].code] =
VsharpLoad{inst.control.smrd.offset, static_cast<s32>(inst.src[0].code) * 2};
continue;
}
@@ -92,21 +91,17 @@ std::optional<FetchShaderData> ParseFetchShader(const Shader::Info& info) {
// Find the load instruction that loaded the V# to the SPGR.
// This is so we can determine its index in the vertex table.
const auto it = std::ranges::find_if(
loads, [&](VsharpLoad& load) { return load.dst_reg == base_sgpr; });
const auto it = loads[base_sgpr];
auto& attrib = data.attributes.emplace_back();
attrib.semantic = semantic_index++;
attrib.dest_vgpr = inst.src[1].code;
attrib.num_elements = inst.control.mubuf.count;
attrib.sgpr_base = it->base_sgpr;
attrib.dword_offset = it->dword_offset;
attrib.sgpr_base = it.base_sgpr;
attrib.dword_offset = it.dword_offset;
// Store instance id rate
attrib.instance_data = inst.src[0].code;
// Mark load as used.
it->dst_reg = -1;
}
}