video.hpp

Go to the documentation of this file.

/*
    Copyright 2021 natinusala
 
    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 <nanovg.h>
 
#include <cmath>
#include <vector>
 
// A VideoContext is responsible for providing a nanovg context for the app
// (so by extension it manages all the graphics state as well as the window / context).
// The VideoContext implementation must also provide the nanovg implementation. As such, there
// can only be one VideoContext linked at any time in the binary.
// Context creation and teardown can be done in the constructor and destructor.
class VideoContext
{
  public:
    virtual ~VideoContext() = default;
 
    virtual void clear(NVGcolor color) = 0;
 
    virtual void beginFrame() = 0;
 
    virtual void endFrame() = 0;
 
    virtual void resetState() = 0;
 
    /*
     * scale factor between window size and drawable size
     */
    virtual double getScaleFactor() = 0;
 
    /*
     * Full screen window at primary monitor
     */
    virtual void fullScreen(bool fs) { }
 
    virtual NVGcontext* getNVGContext() = 0;
 
    virtual bool readPixels(std::vector<unsigned char>* rgba, int* width, int* height) { return false; }
 
    virtual void setSwapInterval(int interval) = 0;
 
    virtual int getCurrentMonitorIndex() { return 0; }
 
    static inline bool FULLSCREEN = false;
 
    // The position and size of the window in the last non-full-screen mode
    static inline float posX = NAN, posY = NAN;
    static inline uint32_t sizeW = 0, sizeH = 0;
 
    static inline int monitorIndex = 0;
 
    static inline int swapInterval = 1;
};