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[Feat] (MG_State/ProgramState): attempting to do shader LTO (WIP)

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swung0x48
2026-06-01 22:26:16 +08:00
parent f93ff00642
commit a579fd2342
1 changed files with 33 additions and 0 deletions
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MobileGL/MG_Util/ShaderTranspiler/ShaderCompiler.cpp
+33
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@@ -224,6 +224,39 @@ namespace MobileGL {
allSpirv.push_back(spirv);
}
// Do cross-stage SPIR-V optimization (LTO) here
if (allSpirv.size() >= 2) {
// Let's assume we only have VS/FS linkage to deal with for now...
MOBILEGL_ASSERT(allSpirv.size() == 2, "More than 2 stages found, unhandled situation.");
MOBILEGL_ASSERT(
(attrib.shaderTypes[0] == GL_VERTEX_SHADER || attrib.shaderTypes[0] == GL_FRAGMENT_SHADER) &&
(attrib.shaderTypes[1] == GL_VERTEX_SHADER || attrib.shaderTypes[1] == GL_FRAGMENT_SHADER),
"Unhandled stage found, unable to optimize");
static std::unordered_set<uint32_t> live_locs; live_locs.clear();
static std::unordered_set<uint32_t> live_builtins; live_builtins.clear();
int vsIdx = (attrib.shaderTypes[0] == GL_VERTEX_SHADER) ? 0 : 1;
int fsIdx = (vsIdx == 0) ? 1 : 0;
auto& vsSpirv = allSpirv[vsIdx];
auto& fsSpirv = allSpirv[fsIdx];
spvtools::OptimizerOptions options;
spvtools::Optimizer frag_opt(SPV_ENV_VULKAN_1_1);
frag_opt.RegisterPass(spvtools::CreateAggressiveDCEPass());
frag_opt.RegisterPass(spvtools::CreateEliminateDeadInputComponentsPass());
frag_opt.RegisterPass(spvtools::CreateAggressiveDCEPass());
frag_opt.RegisterPass(spvtools::CreateAnalyzeLiveInputPass(&live_locs, &live_builtins));
frag_opt.Run(fsSpirv.data(), fsSpirv.size(), &fsSpirv, options);
spvtools::Optimizer vert_opt(SPV_ENV_VULKAN_1_1);
vert_opt.RegisterPass(spvtools::CreateEliminateDeadOutputStoresPass(&live_locs, &live_builtins));
vert_opt.RegisterPass(spvtools::CreateAggressiveDCEPass());
vert_opt.RegisterPass(spvtools::CreateEliminateDeadOutputComponentsPass());
vert_opt.RegisterPass(spvtools::CreateAggressiveDCEPass());
vert_opt.Run(vsSpirv.data(), vsSpirv.size(), &vsSpirv, options);
MGLOG_D("Optimized vs size: %lu, fs size: %lu, vsIdx = %d, fsIdx = %d", vsSpirv.size(), fsSpirv.size(), vsIdx, fsIdx);
}
return allSpirv;
}