gles.h

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/*
 * Copyright (C) 2021 The Android Open Source Project
 *
 * 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.
 */
 
#pragma once
 
#include <optional>
 
#include "GLES/gl.h"
#include "GLES2/gl2.h"
#include "GLES2/gl2ext.h"
#include "GLES3/gl3.h"
 
#include "cuttlefish/host/graphics_detector/egl.h"
#include "cuttlefish/host/graphics_detector/gles_funcs.h"
#include "cuttlefish/host/graphics_detector/lib.h"
 
namespace gfxstream {
 
#define CHECK_GL_ERROR()                                                      \
  do {                                                                        \
    if (GLenum error = gles->glGetError(); error != GL_NO_ERROR) {            \
      LOG(ERROR) << __FILE__ << ":" << __LINE__ << ":" << __PRETTY_FUNCTION__ \
                 << " found error: " << error;                                \
    }                                                                         \
  } while (0);
 
class Gles {
 public:
  static gfxstream::expected<Gles, std::string> Load();
  static gfxstream::expected<Gles, std::string> LoadFromEgl(Egl* egl);
 
  Gles(const Gles&) = delete;
  Gles& operator=(const Gles&) = delete;
 
  Gles(Gles&&) = default;
  Gles& operator=(Gles&&) = default;
 
  std::optional<GLuint> CreateShader(GLenum shader_type,
                                     const std::string& shader_source);
 
  std::optional<GLuint> CreateProgram(const std::string& vert_shader_source,
                                      const std::string& frag_shader_source);
 
#define DECLARE_GLES_FUNCTION_MEMBER_POINTER(return_type, function_name, \
                                             signature, args)            \
  return_type(*function_name) signature = nullptr;
 
  FOR_EACH_GLES_FUNCTION(DECLARE_GLES_FUNCTION_MEMBER_POINTER);
 
 private:
  Gles() = default;
 
  void Init();
 
  Lib lib_;
};
 
}  // namespace gfxstream