1 files changed, 134 insertions, 0 deletions

diff --git a/src/shader_recompiler/backend/spirv/emit_spirv.cpp b/src/shader_recompiler/backend/spirv/emit_spirv.cpp
new file mode 100644
index 000000000..7c4269fad
--- /dev/null
+++ b/src/shader_recompiler/backend/spirv/emit_spirv.cpp
@@ -0,0 +1,134 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <numeric>
+#include <type_traits>
+
+#include "shader_recompiler/backend/spirv/emit_spirv.h"
+#include "shader_recompiler/frontend/ir/basic_block.h"
+#include "shader_recompiler/frontend/ir/function.h"
+#include "shader_recompiler/frontend/ir/microinstruction.h"
+#include "shader_recompiler/frontend/ir/program.h"
+
+namespace Shader::Backend::SPIRV {
+
+EmitContext::EmitContext(IR::Program& program) {
+    AddCapability(spv::Capability::Shader);
+    AddCapability(spv::Capability::Float16);
+    AddCapability(spv::Capability::Float64);
+    void_id = TypeVoid();
+
+    u1 = Name(TypeBool(), "u1");
+    f32.Define(*this, TypeFloat(32), "f32");
+    u32.Define(*this, TypeInt(32, false), "u32");
+    f16.Define(*this, TypeFloat(16), "f16");
+    f64.Define(*this, TypeFloat(64), "f64");
+
+    for (const IR::Function& function : program.functions) {
+        for (IR::Block* const block : function.blocks) {
+            block_label_map.emplace_back(block, OpLabel());
+        }
+    }
+    std::ranges::sort(block_label_map, {}, &std::pair<IR::Block*, Id>::first);
+}
+
+EmitContext::~EmitContext() = default;
+
+EmitSPIRV::EmitSPIRV(IR::Program& program) {
+    EmitContext ctx{program};
+    const Id void_function{ctx.TypeFunction(ctx.void_id)};
+    // FIXME: Forward declare functions (needs sirit support)
+    Id func{};
+    for (IR::Function& function : program.functions) {
+        func = ctx.OpFunction(ctx.void_id, spv::FunctionControlMask::MaskNone, void_function);
+        for (IR::Block* const block : function.blocks) {
+            ctx.AddLabel(ctx.BlockLabel(block));
+            for (IR::Inst& inst : block->Instructions()) {
+                EmitInst(ctx, &inst);
+            }
+        }
+        ctx.OpFunctionEnd();
+    }
+    ctx.AddEntryPoint(spv::ExecutionModel::GLCompute, func, "main");
+
+    std::vector<u32> result{ctx.Assemble()};
+    std::FILE* file{std::fopen("shader.spv", "wb")};
+    std::fwrite(result.data(), sizeof(u32), result.size(), file);
+    std::fclose(file);
+    std::system("spirv-dis shader.spv");
+    std::system("spirv-val shader.spv");
+}
+
+template <auto method>
+static void Invoke(EmitSPIRV& emit, EmitContext& ctx, IR::Inst* inst) {
+    using M = decltype(method);
+    using std::is_invocable_r_v;
+    if constexpr (is_invocable_r_v<Id, M, EmitSPIRV&, EmitContext&>) {
+        ctx.Define(inst, (emit.*method)(ctx));
+    } else if constexpr (is_invocable_r_v<Id, M, EmitSPIRV&, EmitContext&, Id>) {
+        ctx.Define(inst, (emit.*method)(ctx, ctx.Def(inst->Arg(0))));
+    } else if constexpr (is_invocable_r_v<Id, M, EmitSPIRV&, EmitContext&, Id, Id>) {
+        ctx.Define(inst, (emit.*method)(ctx, ctx.Def(inst->Arg(0)), ctx.Def(inst->Arg(1))));
+    } else if constexpr (is_invocable_r_v<Id, M, EmitSPIRV&, EmitContext&, Id, Id, Id>) {
+        ctx.Define(inst, (emit.*method)(ctx, ctx.Def(inst->Arg(0)), ctx.Def(inst->Arg(1)),
+                                        ctx.Def(inst->Arg(2))));
+    } else if constexpr (is_invocable_r_v<Id, M, EmitSPIRV&, EmitContext&, IR::Inst*, Id, Id>) {
+        ctx.Define(inst, (emit.*method)(ctx, inst, ctx.Def(inst->Arg(0)), ctx.Def(inst->Arg(1))));
+    } else if constexpr (is_invocable_r_v<Id, M, EmitSPIRV&, EmitContext&, IR::Inst*, Id, Id, Id>) {
+        ctx.Define(inst, (emit.*method)(ctx, inst, ctx.Def(inst->Arg(0)), ctx.Def(inst->Arg(1)),
+                                        ctx.Def(inst->Arg(2))));
+    } else if constexpr (is_invocable_r_v<Id, M, EmitSPIRV&, EmitContext&, Id, u32>) {
+        ctx.Define(inst, (emit.*method)(ctx, ctx.Def(inst->Arg(0)), inst->Arg(1).U32()));
+    } else if constexpr (is_invocable_r_v<Id, M, EmitSPIRV&, EmitContext&, const IR::Value&>) {
+        ctx.Define(inst, (emit.*method)(ctx, inst->Arg(0)));
+    } else if constexpr (is_invocable_r_v<Id, M, EmitSPIRV&, EmitContext&, const IR::Value&,
+                                          const IR::Value&>) {
+        ctx.Define(inst, (emit.*method)(ctx, inst->Arg(0), inst->Arg(1)));
+    } else if constexpr (is_invocable_r_v<void, M, EmitSPIRV&, EmitContext&, IR::Inst*>) {
+        (emit.*method)(ctx, inst);
+    } else if constexpr (is_invocable_r_v<void, M, EmitSPIRV&, EmitContext&>) {
+        (emit.*method)(ctx);
+    } else {
+        static_assert(false, "Bad format");
+    }
+}
+
+void EmitSPIRV::EmitInst(EmitContext& ctx, IR::Inst* inst) {
+    switch (inst->Opcode()) {
+#define OPCODE(name, result_type, ...)                                                             \
+    case IR::Opcode::name:                                                                         \
+        return Invoke<&EmitSPIRV::Emit##name>(*this, ctx, inst);
+#include "shader_recompiler/frontend/ir/opcodes.inc"
+#undef OPCODE
+    }
+    throw LogicError("Invalid opcode {}", inst->Opcode());
+}
+
+void EmitSPIRV::EmitPhi(EmitContext&) {
+    throw NotImplementedException("SPIR-V Instruction");
+}
+
+void EmitSPIRV::EmitVoid(EmitContext&) {}
+
+void EmitSPIRV::EmitIdentity(EmitContext&) {
+    throw NotImplementedException("SPIR-V Instruction");
+}
+
+void EmitSPIRV::EmitGetZeroFromOp(EmitContext&) {
+    throw LogicError("Unreachable instruction");
+}
+
+void EmitSPIRV::EmitGetSignFromOp(EmitContext&) {
+    throw LogicError("Unreachable instruction");
+}
+
+void EmitSPIRV::EmitGetCarryFromOp(EmitContext&) {
+    throw LogicError("Unreachable instruction");
+}
+
+void EmitSPIRV::EmitGetOverflowFromOp(EmitContext&) {
+    throw LogicError("Unreachable instruction");
+}
+
+} // namespace Shader::Backend::SPIRV