GLContextAndroid.hpp

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/*
 *  Copyright 2019-2021 Diligent Graphics LLC
 *  Copyright 2015-2019 Egor Yusov
 *  
 *  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.
 *
 *  In no event and under no legal theory, whether in tort (including negligence), 
 *  contract, or otherwise, unless required by applicable law (such as deliberate 
 *  and grossly negligent acts) or agreed to in writing, shall any Contributor be
 *  liable for any damages, including any direct, indirect, special, incidental, 
 *  or consequential damages of any character arising as a result of this License or 
 *  out of the use or inability to use the software (including but not limited to damages 
 *  for loss of goodwill, work stoppage, computer failure or malfunction, or any and 
 *  all other commercial damages or losses), even if such Contributor has been advised 
 *  of the possibility of such damages.
 */
 
#pragma once
 
#include <EGL/egl.h>
#include <android/native_window.h>
 
namespace Diligent
{
 
class GLContext
{
public:
    using NativeGLContextType = EGLContext;
 
    GLContext(const struct EngineGLCreateInfo& InitAttribs, struct DeviceCaps& DeviceCaps, const struct SwapChainDesc* pSCDesc);
    ~GLContext();
 
    bool Init(ANativeWindow* window);
 
    void SwapBuffers(int SwapInterval);
 
    void UpdateScreenSize();
 
    bool Invalidate();
 
    void   Suspend();
    EGLint Resume(ANativeWindow* window);
 
    NativeGLContextType GetCurrentNativeGLContext();
 
    int32_t GetScreenWidth() const { return screen_width_; }
    int32_t GetScreenHeight() const { return screen_height_; }
 
private:
    //EGL configurations
    ANativeWindow* window_  = nullptr;
    EGLDisplay     display_ = EGL_NO_DISPLAY;
    EGLSurface     surface_ = EGL_NO_SURFACE;
    EGLContext     context_ = EGL_NO_CONTEXT;
    EGLConfig      config_;
 
    const bool create_debug_context_;
 
    EGLint egl_major_version_ = 0;
    EGLint egl_minor_version_ = 0;
 
    //Screen parameters
    int32_t color_size_    = 0;
    int32_t depth_size_    = 0;
    int32_t major_version_ = 0;
    int32_t minor_version_ = 0;
    int32_t screen_width_  = 0;
    int32_t screen_height_ = 0;
 
    EGLint min_swap_interval_ = 0;
    EGLint max_swap_interval_ = 1;
 
    //Flags
    bool gles_initialized_        = false;
    bool egl_context_initialized_ = false;
    bool context_valid_           = false;
 
    void InitGLES();
    void Terminate();
    bool InitEGLSurface();
    bool InitEGLContext();
    void AttachToCurrentEGLContext();
    void FillDeviceCaps(DeviceCaps& DeviceCaps);
};
 
} // namespace Diligent