GL4ShaderCache util class - caching to filesystem disabled by default

src/xenia/gpu/gl4/gl4_shader_cache.h

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+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2016 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_GPU_GL4_SHADER_CACHE_H_
+#define XENIA_GPU_GL4_SHADER_CACHE_H_
+
+#include <cstdint>
+#include <unordered_map>
+#include <memory>
+
+#include "xenia/gpu/xenos.h"
+
+namespace xe {
+namespace gpu {
+class GlslShaderTranslator;
+
+namespace gl4 {
+
+class GL4Shader;
+
+class GL4ShaderCache {
+ public:
+  GL4ShaderCache(GlslShaderTranslator* shader_translator);
+  ~GL4ShaderCache();
+
+  void Reset();
+  GL4Shader* LookupOrInsertShader(ShaderType shader_type,
+                                  const uint32_t* dwords, uint32_t dword_count);
+
+ private:
+  // Cached shader file format.
+  struct CachedShader {
+    uint32_t magic;
+    uint32_t version;        // Version of the shader translator used.
+    uint8_t shader_type;     // ShaderType enum
+    uint32_t binary_len;     // Code length
+    uint32_t binary_format;  // Binary format (from OpenGL)
+    uint8_t binary[1];       // Code
+  };
+
+  void CacheShader(GL4Shader* shader);
+  GL4Shader* FindCachedShader(ShaderType shader_type, uint64_t hash,
+                              const uint32_t* dwords, uint32_t dword_count);
+
+  GlslShaderTranslator* shader_translator_ = nullptr;
+  std::vector<std::unique_ptr<GL4Shader>> all_shaders_;
+  std::unordered_map<uint64_t, GL4Shader*> shader_map_;
+};
+
+}  // namespace gl4
+}  // namespace gpu
+}  // namespace xe
+
+#endif  // XENIA_GPU_GL4_SHADER_CACHE_H_