// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef FLUTTER_SHELL_PLATFORM_WINDOWS_GL_PROC_TABLE_H_
#define FLUTTER_SHELL_PLATFORM_WINDOWS_GL_PROC_TABLE_H_

#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>
#include <functional>
#include <memory>

#include "flutter/fml/macros.h"

namespace flutter {

// Lookup table for GLES functions.
class GlProcTable {
 public:
  static std::shared_ptr<GlProcTable> Create();

  virtual ~GlProcTable();

  virtual void GenTextures(GLsizei n, GLuint* textures) const;
  virtual void DeleteTextures(GLsizei n, const GLuint* textures) const;
  virtual void BindTexture(GLenum target, GLuint texture) const;
  virtual void TexParameteri(GLenum target, GLenum pname, GLint param) const;
  virtual void TexImage2D(GLenum target,
                          GLint level,
                          GLint internalformat,
                          GLsizei width,
                          GLsizei height,
                          GLint border,
                          GLenum format,
                          GLenum type,
                          const void* data) const;

 protected:
  GlProcTable();

 private:
  using GenTexturesProc = void(__stdcall*)(GLsizei n, GLuint* textures);
  using DeleteTexturesProc = void(__stdcall*)(GLsizei n,
                                              const GLuint* textures);
  using BindTextureProc = void(__stdcall*)(GLenum target, GLuint texture);
  using TexParameteriProc = void(__stdcall*)(GLenum target,
                                             GLenum pname,
                                             GLint param);
  using TexImage2DProc = void(__stdcall*)(GLenum target,
                                          GLint level,
                                          GLint internalformat,
                                          GLsizei width,
                                          GLsizei height,
                                          GLint border,
                                          GLenum format,
                                          GLenum type,
                                          const void* data);

  GenTexturesProc gen_textures_;
  DeleteTexturesProc delete_textures_;
  BindTextureProc bind_texture_;
  TexParameteriProc tex_parameteri_;
  TexImage2DProc tex_image_2d_;

  FML_DISALLOW_COPY_AND_ASSIGN(GlProcTable);
};

}  // namespace flutter

#endif  // FLUTTER_SHELL_PLATFORM_WINDOWS_GL_PROC_TABLE_H_