[SPIR-V] Some initial bits of the translator

src/xenia/gpu/spirv_shader_translator.h

@@ -0,0 +1,85 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2020 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_GPU_SPIRV_SHADER_TRANSLATOR_H_
+#define XENIA_GPU_SPIRV_SHADER_TRANSLATOR_H_
+
+#include <cstdint>
+#include <memory>
+#include <vector>
+
+#include "third_party/glslang/SPIRV/SpvBuilder.h"
+#include "xenia/gpu/shader_translator.h"
+
+namespace xe {
+namespace gpu {
+
+class SpirvShaderTranslator : public ShaderTranslator {
+ public:
+  SpirvShaderTranslator(bool supports_clip_distance = true,
+                        bool supports_cull_distance = true);
+
+ protected:
+  void Reset() override;
+
+  void StartTranslation() override;
+
+  std::vector<uint8_t> CompleteTranslation() override;
+
+ private:
+  // TODO(Triang3l): Depth-only pixel shader.
+  bool IsSpirvVertexOrTessEvalShader() const { return is_vertex_shader(); }
+  bool IsSpirvVertexShader() const {
+    return IsSpirvVertexOrTessEvalShader() &&
+           host_vertex_shader_type() == Shader::HostVertexShaderType::kVertex;
+  }
+  bool IsSpirvTessEvalShader() const {
+    return IsSpirvVertexOrTessEvalShader() &&
+           host_vertex_shader_type() != Shader::HostVertexShaderType::kVertex;
+  }
+  bool IsSpirvFragmentShader() const { return is_pixel_shader(); }
+
+  void StartVertexOrTessEvalShaderBeforeMain();
+  void CompleteVertexOrTessEvalShaderInMain();
+
+  bool supports_clip_distance_;
+  bool supports_cull_distance_;
+
+  std::unique_ptr<spv::Builder> builder_;
+
+  spv::Id ext_inst_glsl_std_450_;
+
+  spv::Id type_void_;
+  spv::Id type_float_;
+  spv::Id type_float2_;
+  spv::Id type_float3_;
+  spv::Id type_float4_;
+  spv::Id type_int_;
+  spv::Id type_uint_;
+
+  spv::Id input_vertex_index_;
+  spv::Id input_primitive_id_;
+
+  enum OutputPerVertexMember : unsigned int {
+    kOutputPerVertexMemberPosition,
+    kOutputPerVertexMemberPointSize,
+    kOutputPerVertexMemberClipDistance,
+    kOutputPerVertexMemberCullDistance,
+    kOutputPerVertexMemberCount,
+  };
+  spv::Id output_per_vertex_;
+
+  spv::Id function_main_;
+  spv::Id var_main_registers_;
+};
+
+}  // namespace gpu
+}  // namespace xe
+
+#endif  // XENIA_GPU_SPIRV_SHADER_TRANSLATOR_H_