| // Copyright 2017 Google Inc. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #ifndef COBALT_RENDERER_RASTERIZER_EGL_SHADER_PROGRAM_MANAGER_H_ |
| #define COBALT_RENDERER_RASTERIZER_EGL_SHADER_PROGRAM_MANAGER_H_ |
| |
| #include "base/containers/linked_hash_map.h" |
| #include "cobalt/base/polymorphic_downcast.h" |
| #include "cobalt/base/type_id.h" |
| #include "cobalt/renderer/rasterizer/egl/shader_program.h" |
| |
| namespace cobalt { |
| namespace renderer { |
| namespace rasterizer { |
| namespace egl { |
| |
| // This class caches shader programs. This is not thread-safe, and the caller |
| // is expected to ensure access to these shader programs occurs from a single |
| // context. |
| class ShaderProgramManager { |
| public: |
| ShaderProgramManager(); |
| ~ShaderProgramManager(); |
| |
| // Get the specified shader program from the cache or compile the program if |
| // it wasn't cached. |
| // NOTE: If a new program needed to be compiled, then the current |
| // glUseProgram state may be altered as part of the program initialization. |
| template<typename ShaderProgramType> |
| void GetProgram(ShaderProgramType** out_program); |
| |
| protected: |
| ShaderProgramBase* FindProgram(base::TypeId program_type_id); |
| void AddProgram(base::TypeId program_type_id, ShaderProgramBase* program); |
| |
| typedef base::linked_hash_map<base::TypeId, ShaderProgramBase*> ProgramMap; |
| ProgramMap program_map_; |
| }; |
| |
| template<typename ShaderProgramType> |
| inline void ShaderProgramManager::GetProgram(ShaderProgramType** out_program) { |
| base::TypeId program_type_id = base::GetTypeId<ShaderProgramType>(); |
| ShaderProgramBase* program = FindProgram(program_type_id); |
| if (program == NULL) { |
| program = new ShaderProgramType(); |
| AddProgram(program_type_id, program); |
| } |
| *out_program = base::polymorphic_downcast<ShaderProgramType*>(program); |
| } |
| |
| } // namespace egl |
| } // namespace rasterizer |
| } // namespace renderer |
| } // namespace cobalt |
| |
| #endif // COBALT_RENDERER_RASTERIZER_EGL_SHADER_PROGRAM_MANAGER_H_ |