nullvideo: initial release of null video backend

Source/Core/VideoBackends/Null/ShaderCache.h

@@ -0,0 +1,93 @@
+// Copyright 2015 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <map>
+#include <memory>
+
+#include "VideoCommon/GeometryShaderGen.h"
+#include "VideoCommon/PixelShaderGen.h"
+#include "VideoCommon/VertexShaderGen.h"
+#include "VideoCommon/VideoCommon.h"
+
+namespace Null
+{
+template <typename Uid>
+class ShaderCache
+{
+public:
+  ShaderCache();
+  virtual ~ShaderCache();
+
+  void Clear();
+  bool SetShader(DSTALPHA_MODE dst_alpha_mode, u32 primitive_type);
+
+protected:
+  virtual Uid GetUid(DSTALPHA_MODE dst_alpha_mode, u32 primitive_type, API_TYPE api_type) = 0;
+  virtual ShaderCode GenerateCode(DSTALPHA_MODE dst_alpha_mode, u32 primitive_type,
+                                  API_TYPE api_type) = 0;
+
+private:
+  std::map<Uid, std::string> m_shaders;
+  const std::string* m_last_entry = nullptr;
+  Uid m_last_uid;
+  UidChecker<Uid, ShaderCode> m_uid_checker;
+};
+
+class VertexShaderCache : public ShaderCache<VertexShaderUid>
+{
+public:
+  static std::unique_ptr<VertexShaderCache> s_instance;
+
+protected:
+  VertexShaderUid GetUid(DSTALPHA_MODE dst_alpha_mode, u32 primitive_type,
+                         API_TYPE api_type) override
+  {
+    return GetVertexShaderUid(api_type);
+  }
+  ShaderCode GenerateCode(DSTALPHA_MODE dst_alpha_mode, u32 primitive_type,
+                          API_TYPE api_type) override
+  {
+    return GenerateVertexShaderCode(api_type);
+  }
+};
+
+class GeometryShaderCache : public ShaderCache<GeometryShaderUid>
+{
+public:
+  static std::unique_ptr<GeometryShaderCache> s_instance;
+
+protected:
+  GeometryShaderUid GetUid(DSTALPHA_MODE dst_alpha_mode, u32 primitive_type,
+                           API_TYPE api_type) override
+  {
+    return GetGeometryShaderUid(primitive_type, api_type);
+  }
+  ShaderCode GenerateCode(DSTALPHA_MODE dst_alpha_mode, u32 primitive_type,
+                          API_TYPE api_type) override
+  {
+    return GenerateGeometryShaderCode(primitive_type, api_type);
+  }
+};
+
+class PixelShaderCache : public ShaderCache<PixelShaderUid>
+{
+public:
+  static std::unique_ptr<PixelShaderCache> s_instance;
+
+protected:
+  PixelShaderUid GetUid(DSTALPHA_MODE dst_alpha_mode, u32 primitive_type,
+                        API_TYPE api_type) override
+  {
+    return GetPixelShaderUid(dst_alpha_mode, api_type);
+  }
+  ShaderCode GenerateCode(DSTALPHA_MODE dst_alpha_mode, u32 primitive_type,
+                          API_TYPE api_type) override
+  {
+    return GeneratePixelShaderCode(dst_alpha_mode, api_type);
+  }
+};
+
+}  // namespace NULL