glsl: Initial backend

1 files changed, 156 insertions, 0 deletions

diff --git a/src/shader_recompiler/backend/glsl/emit_glsl.cpp b/src/shader_recompiler/backend/glsl/emit_glsl.cpp
new file mode 100644
index 000000000..bb1d8b272
--- /dev/null
+++ b/src/shader_recompiler/backend/glsl/emit_glsl.cpp
@@ -0,0 +1,156 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <string>
+#include <tuple>
+
+#include "shader_recompiler/backend/bindings.h"
+#include "shader_recompiler/backend/glsl/emit_context.h"
+#include "shader_recompiler/backend/glsl/emit_glsl.h"
+#include "shader_recompiler/backend/glsl/emit_glsl_instructions.h"
+#include "shader_recompiler/frontend/ir/program.h"
+#include "shader_recompiler/profile.h"
+
+#pragma optimize("", off)
+namespace Shader::Backend::GLSL {
+namespace {
+template <class Func>
+struct FuncTraits {};
+
+template <class ReturnType_, class... Args>
+struct FuncTraits<ReturnType_ (*)(Args...)> {
+    using ReturnType = ReturnType_;
+
+    static constexpr size_t NUM_ARGS = sizeof...(Args);
+
+    template <size_t I>
+    using ArgType = std::tuple_element_t<I, std::tuple<Args...>>;
+};
+
+template <auto func, typename... Args>
+void SetDefinition(EmitContext& ctx, IR::Inst* inst, Args... args) {
+    inst->SetDefinition<Id>(func(ctx, std::forward<Args>(args)...));
+}
+
+template <typename ArgType>
+ArgType Arg(EmitContext& ctx, const IR::Value& arg) {
+    if constexpr (std::is_same_v<ArgType, std::string_view>) {
+        return ctx.reg_alloc.Consume(arg);
+    } else if constexpr (std::is_same_v<ArgType, IR::Inst&>) {
+        return *arg.Inst();
+    } else if constexpr (std::is_same_v<ArgType, const IR::Value&>) {
+        return arg;
+    } else if constexpr (std::is_same_v<ArgType, u32>) {
+        return arg.U32();
+    } else if constexpr (std::is_same_v<ArgType, IR::Attribute>) {
+        return arg.Attribute();
+    } else if constexpr (std::is_same_v<ArgType, IR::Patch>) {
+        return arg.Patch();
+    } else if constexpr (std::is_same_v<ArgType, IR::Reg>) {
+        return arg.Reg();
+    }
+}
+
+template <auto func, bool is_first_arg_inst, size_t... I>
+void Invoke(EmitContext& ctx, IR::Inst* inst, std::index_sequence<I...>) {
+    using Traits = FuncTraits<decltype(func)>;
+    if constexpr (std::is_same_v<typename Traits::ReturnType, Id>) {
+        if constexpr (is_first_arg_inst) {
+            SetDefinition<func>(
+                ctx, inst, inst,
+                Arg<typename Traits::template ArgType<I + 2>>(ctx, inst->Arg(I))...);
+        } else {
+            SetDefinition<func>(
+                ctx, inst, Arg<typename Traits::template ArgType<I + 1>>(ctx, inst->Arg(I))...);
+        }
+    } else {
+        if constexpr (is_first_arg_inst) {
+            func(ctx, inst, Arg<typename Traits::template ArgType<I + 2>>(ctx, inst->Arg(I))...);
+        } else {
+            func(ctx, Arg<typename Traits::template ArgType<I + 1>>(ctx, inst->Arg(I))...);
+        }
+    }
+}
+
+template <auto func>
+void Invoke(EmitContext& ctx, IR::Inst* inst) {
+    using Traits = FuncTraits<decltype(func)>;
+    static_assert(Traits::NUM_ARGS >= 1, "Insufficient arguments");
+    if constexpr (Traits::NUM_ARGS == 1) {
+        Invoke<func, false>(ctx, inst, std::make_index_sequence<0>{});
+    } else {
+        using FirstArgType = typename Traits::template ArgType<1>;
+        static constexpr bool is_first_arg_inst = std::is_same_v<FirstArgType, IR::Inst*>;
+        using Indices = std::make_index_sequence<Traits::NUM_ARGS - (is_first_arg_inst ? 2 : 1)>;
+        Invoke<func, is_first_arg_inst>(ctx, inst, Indices{});
+    }
+}
+
+void EmitInst(EmitContext& ctx, IR::Inst* inst) {
+    switch (inst->GetOpcode()) {
+#define OPCODE(name, result_type, ...)                                                             \
+    case IR::Opcode::name:                                                                         \
+        return Invoke<&Emit##name>(ctx, inst);
+#include "shader_recompiler/frontend/ir/opcodes.inc"
+#undef OPCODE
+    }
+    throw LogicError("Invalid opcode {}", inst->GetOpcode());
+}
+
+void EmitCode(EmitContext& ctx, const IR::Program& program) {
+    for (const IR::AbstractSyntaxNode& node : program.syntax_list) {
+        switch (node.type) {
+        case IR::AbstractSyntaxNode::Type::Block:
+            for (IR::Inst& inst : node.data.block->Instructions()) {
+                EmitInst(ctx, &inst);
+            }
+            break;
+        case IR::AbstractSyntaxNode::Type::If:
+            ctx.Add("if (");
+            break;
+        case IR::AbstractSyntaxNode::Type::EndIf:
+            ctx.Add("){{");
+            break;
+        case IR::AbstractSyntaxNode::Type::Loop:
+            ctx.Add("while (");
+            break;
+        case IR::AbstractSyntaxNode::Type::Repeat:
+            if (node.data.repeat.cond.IsImmediate()) {
+                if (node.data.repeat.cond.U1()) {
+                    ctx.Add("ENDREP;");
+                } else {
+                    ctx.Add("BRK;"
+                            "ENDREP;");
+                }
+            }
+            break;
+        case IR::AbstractSyntaxNode::Type::Break:
+            if (node.data.break_node.cond.IsImmediate()) {
+                if (node.data.break_node.cond.U1()) {
+                    ctx.Add("break;");
+                }
+            }
+            break;
+        case IR::AbstractSyntaxNode::Type::Return:
+        case IR::AbstractSyntaxNode::Type::Unreachable:
+            ctx.Add("return;");
+            break;
+        default:
+            ctx.Add("UNAHNDLED {}", node.type);
+            break;
+        }
+    }
+}
+
+} // Anonymous namespace
+
+std::string EmitGLSL(const Profile& profile, IR::Program& program, Bindings& bindings) {
+    EmitContext ctx{program, bindings, profile};
+    // ctx.SetupBuffers();
+    EmitCode(ctx, program);
+    ctx.code += "}";
+    return ctx.code;
+}
+
+} // namespace Shader::Backend::GLSL