1 files changed, 160 insertions, 0 deletions
diff --git a/src/shader_recompiler/backend/spirv/emit_context.cpp b/src/shader_recompiler/backend/spirv/emit_context.cpp
new file mode 100644
index 000000000..1c985aff8
--- /dev/null
+++ b/src/shader_recompiler/backend/spirv/emit_context.cpp
@@ -0,0 +1,160 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <algorithm>
+#include <array>
+#include <string_view>
+
+#include <fmt/format.h>
+
+#include "common/common_types.h"
+#include "shader_recompiler/backend/spirv/emit_context.h"
+
+namespace Shader::Backend::SPIRV {
+
+void VectorTypes::Define(Sirit::Module& sirit_ctx, Id base_type, std::string_view name) {
+    defs[0] = sirit_ctx.Name(base_type, name);
+
+    std::array<char, 6> def_name;
+    for (int i = 1; i < 4; ++i) {
+        const std::string_view def_name_view(
+            def_name.data(),
+            fmt::format_to_n(def_name.data(), def_name.size(), "{}x{}", name, i + 1).size);
+        defs[i] = sirit_ctx.Name(sirit_ctx.TypeVector(base_type, i + 1), def_name_view);
+    }
+}
+
+EmitContext::EmitContext(IR::Program& program) : Sirit::Module(0x00010000) {
+    AddCapability(spv::Capability::Shader);
+    DefineCommonTypes(program.info);
+    DefineCommonConstants();
+    DefineSpecialVariables(program.info);
+    DefineConstantBuffers(program.info);
+    DefineStorageBuffers(program.info);
+    DefineLabels(program);
+}
+
+EmitContext::~EmitContext() = default;
+
+Id EmitContext::Def(const IR::Value& value) {
+    if (!value.IsImmediate()) {
+        return value.Inst()->Definition<Id>();
+    }
+    switch (value.Type()) {
+    case IR::Type::U1:
+        return value.U1() ? true_value : false_value;
+    case IR::Type::U32:
+        return Constant(U32[1], value.U32());
+    case IR::Type::F32:
+        return Constant(F32[1], value.F32());
+    default:
+        throw NotImplementedException("Immediate type {}", value.Type());
+    }
+}
+
+void EmitContext::DefineCommonTypes(const Info& info) {
+    void_id = TypeVoid();
+
+    U1 = Name(TypeBool(), "u1");
+
+    F32.Define(*this, TypeFloat(32), "f32");
+    U32.Define(*this, TypeInt(32, false), "u32");
+
+    if (info.uses_fp16) {
+        AddCapability(spv::Capability::Float16);
+        F16.Define(*this, TypeFloat(16), "f16");
+    }
+    if (info.uses_fp64) {
+        AddCapability(spv::Capability::Float64);
+        F64.Define(*this, TypeFloat(64), "f64");
+    }
+}
+
+void EmitContext::DefineCommonConstants() {
+    true_value = ConstantTrue(U1);
+    false_value = ConstantFalse(U1);
+    u32_zero_value = Constant(U32[1], 0U);
+}
+
+void EmitContext::DefineSpecialVariables(const Info& info) {
+    const auto define{[this](Id type, spv::BuiltIn builtin, spv::StorageClass storage_class) {
+        const Id pointer_type{TypePointer(storage_class, type)};
+        const Id id{AddGlobalVariable(pointer_type, spv::StorageClass::Input)};
+        Decorate(id, spv::Decoration::BuiltIn, builtin);
+        return id;
+    }};
+    using namespace std::placeholders;
+    const auto define_input{std::bind(define, _1, _2, spv::StorageClass::Input)};
+
+    if (info.uses_workgroup_id) {
+        workgroup_id = define_input(U32[3], spv::BuiltIn::WorkgroupId);
+    }
+    if (info.uses_local_invocation_id) {
+        local_invocation_id = define_input(U32[3], spv::BuiltIn::LocalInvocationId);
+    }
+}
+
+void EmitContext::DefineConstantBuffers(const Info& info) {
+    if (info.constant_buffer_descriptors.empty()) {
+        return;
+    }
+    const Id array_type{TypeArray(U32[1], Constant(U32[1], 4096))};
+    Decorate(array_type, spv::Decoration::ArrayStride, 16U);
+
+    const Id struct_type{TypeStruct(array_type)};
+    Name(struct_type, "cbuf_block");
+    Decorate(struct_type, spv::Decoration::Block);
+    MemberName(struct_type, 0, "data");
+    MemberDecorate(struct_type, 0, spv::Decoration::Offset, 0U);
+
+    const Id uniform_type{TypePointer(spv::StorageClass::Uniform, struct_type)};
+    uniform_u32 = TypePointer(spv::StorageClass::Uniform, U32[1]);
+
+    u32 binding{};
+    for (const Info::ConstantBufferDescriptor& desc : info.constant_buffer_descriptors) {
+        const Id id{AddGlobalVariable(uniform_type, spv::StorageClass::Uniform)};
+        Decorate(id, spv::Decoration::Binding, binding);
+        Name(id, fmt::format("c{}", desc.index));
+        std::fill_n(cbufs.data() + desc.index, desc.count, id);
+        binding += desc.count;
+    }
+}
+
+void EmitContext::DefineStorageBuffers(const Info& info) {
+    if (info.storage_buffers_descriptors.empty()) {
+        return;
+    }
+    AddExtension("SPV_KHR_storage_buffer_storage_class");
+
+    const Id array_type{TypeRuntimeArray(U32[1])};
+    Decorate(array_type, spv::Decoration::ArrayStride, 4U);
+
+    const Id struct_type{TypeStruct(array_type)};
+    Name(struct_type, "ssbo_block");
+    Decorate(struct_type, spv::Decoration::Block);
+    MemberName(struct_type, 0, "data");
+    MemberDecorate(struct_type, 0, spv::Decoration::Offset, 0U);
+
+    const Id storage_type{TypePointer(spv::StorageClass::StorageBuffer, struct_type)};
+    storage_u32 = TypePointer(spv::StorageClass::StorageBuffer, U32[1]);
+
+    u32 binding{};
+    for (const Info::StorageBufferDescriptor& desc : info.storage_buffers_descriptors) {
+        const Id id{AddGlobalVariable(storage_type, spv::StorageClass::StorageBuffer)};
+        Decorate(id, spv::Decoration::Binding, binding);
+        Name(id, fmt::format("ssbo{}", binding));
+        std::fill_n(ssbos.data() + binding, desc.count, id);
+        binding += desc.count;
+    }
+}
+
+void EmitContext::DefineLabels(IR::Program& program) {
+    for (const IR::Function& function : program.functions) {
+        for (IR::Block* const block : function.blocks) {
+            block->SetDefinition(OpLabel());
+        }
+    }
+}
+
+} // namespace Shader::Backend::SPIRV