text: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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.
   */
  
  /*!
   * \file codegen_opengl.h
   * \brief Generate OpenGL device code.
   */
  #ifndef TVM_CODEGEN_CODEGEN_OPENGL_H_
  #define TVM_CODEGEN_CODEGEN_OPENGL_H_
  
  #include <tvm/codegen.h>
  #include <tvm/packed_func_ext.h>
  #include <string>
  #include <unordered_set>
  #include <unordered_map>
  #include "codegen_c.h"
  #include "../runtime/opengl/opengl_module.h"
  
  namespace tvm {
  namespace codegen {
  
  class CodeGenOpenGL final : public CodeGenC {
   public:
    CodeGenOpenGL();
    void AddFunction(LoweredFunc f);
    std::unordered_map<std::string, runtime::OpenGLShader> Finish();
  
    void InitFuncState(LoweredFunc f) final;
    void BindThreadIndex(const IterVar& iv) final;
    void VisitStmt_(const Store* op) final;
    std::string TexelFetch(const Variable* buffer, Expr index);
    std::string GetBufferRef(Type t, const Variable* buffer, Expr index) final;
    void PrintType(Type t, std::ostream& os) final; // NOLINT(*)
  
    // Codegen for immediate values
    void VisitExpr_(const IntImm* op, std::ostream& os) final;  // NOLINT(*)
    void VisitExpr_(const UIntImm* op, std::ostream& os) final;  // NOLINT(*)
    void VisitExpr_(const FloatImm* op, std::ostream& os) final;  // NOLINT(*)
    void VisitExpr_(const StringImm* op, std::ostream& os) final;  // NOLINT(*)
  
    // Match glsl_texture_store Call.
    void VisitStmt_(const Evaluate* op) final;  // NOLINT(*)
  
   private:
    const Variable* output_{nullptr};
    std::unordered_set<const Variable*> inputs_;
    const Variable* output_iter_var_{nullptr};
    std::unordered_map<std::string, runtime::OpenGLShader> shaders_;
    std::string thread_extent_var_;
  };
  
  }  // namespace codegen
  }  // namespace tvm
  
  #endif  // TVM_CODEGEN_CODEGEN_OPENGL_H_
  