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shader_recompiler: emulate 8-bit and 16-bit storage writes with cas loop

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This commit is contained in:
Liam
2024-01-11 16:50:59 -05:00
parent 6533dfd7ce
commit 2a0d707ce1
3 changed files with 86 additions and 8 deletions
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51
src/shader_recompiler/backend/spirv/spirv_emit_context.cpp
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@ -480,6 +480,7 @@ EmitContext::EmitContext(const Profile& profile_, const RuntimeInfo& runtime_inf
DefineTextures(program.info, texture_binding, bindings.texture_scaling_index);
DefineImages(program.info, image_binding, bindings.image_scaling_index);
DefineAttributeMemAccess(program.info);
DefineWriteStorageCasLoopFunction(program.info);
DefineGlobalMemoryFunctions(program.info);
DefineRescalingInput(program.info);
DefineRenderArea(program.info);
@ -877,6 +878,56 @@ void EmitContext::DefineAttributeMemAccess(const Info& info) {
}
}
void EmitContext::DefineWriteStorageCasLoopFunction(const Info& info) {
if (profile.support_int8 && profile.support_int16) {
return;
}
if (!info.uses_int8 && !info.uses_int16) {
return;
}
AddCapability(spv::Capability::VariablePointersStorageBuffer);
const Id ptr_type{TypePointer(spv::StorageClass::StorageBuffer, U32[1])};
const Id func_type{TypeFunction(void_id, ptr_type, U32[1], U32[1], U32[1])};
const Id func{OpFunction(void_id, spv::FunctionControlMask::MaskNone, func_type)};
const Id pointer{OpFunctionParameter(ptr_type)};
const Id value{OpFunctionParameter(U32[1])};
const Id bit_offset{OpFunctionParameter(U32[1])};
const Id bit_count{OpFunctionParameter(U32[1])};
AddLabel();
const Id scope_device{Const(1u)};
const Id ordering_relaxed{u32_zero_value};
const Id body_label{OpLabel()};
const Id continue_label{OpLabel()};
const Id endloop_label{OpLabel()};
const Id beginloop_label{OpLabel()};
OpBranch(beginloop_label);
AddLabel(beginloop_label);
OpLoopMerge(endloop_label, continue_label, spv::LoopControlMask::MaskNone);
OpBranch(body_label);
AddLabel(body_label);
const Id expected_value{OpLoad(U32[1], pointer)};
const Id desired_value{OpBitFieldInsert(U32[1], expected_value, value, bit_offset, bit_count)};
const Id actual_value{OpAtomicCompareExchange(U32[1], pointer, scope_device, ordering_relaxed,
ordering_relaxed, desired_value, expected_value)};
const Id store_successful{OpIEqual(U1, expected_value, actual_value)};
OpBranchConditional(store_successful, endloop_label, continue_label);
AddLabel(endloop_label);
OpReturn();
AddLabel(continue_label);
OpBranch(beginloop_label);
OpFunctionEnd();
write_storage_cas_loop_func = func;
}
void EmitContext::DefineGlobalMemoryFunctions(const Info& info) {
if (!info.uses_global_memory || !profile.support_int64) {
return;