qt/GLESWindowFramebuffer.h

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/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
 
#ifndef META_OCEAN_RENDERING_GLES_QT_GLES_WINDOW_FRAMEBUFFER_H
#define META_OCEAN_RENDERING_GLES_QT_GLES_WINDOW_FRAMEBUFFER_H
 
#include "ocean/rendering/glescenegraph/GLESceneGraph.h"
#include "ocean/rendering/glescenegraph/GLESEngine.h"
#include "ocean/rendering/glescenegraph/GLESFramebuffer.h"
#include "ocean/rendering/glescenegraph/GLESTraverser.h"
 
#include "ocean/rendering/WindowFramebuffer.h"
 
#include <QtWidgets/QOpenGLWidget>
 
namespace Ocean
{
 
namespace Rendering
{
 
namespace GLESceneGraph
{
 
namespace QT
{
 
/**
 * This class is the base class for all GLESceneGraph window framebuffers for Qt-enabled platforms.
 * @ingroup renderinggles
 */
class GLESWindowFramebuffer :
    virtual public QOpenGLWidget,
    virtual public GLESFramebuffer,
    virtual public WindowFramebuffer
{
    friend class GLESEngineQT;
 
    public:
 
        /**
         * Returns the transformation between display and device.
         * @see Framebuffer::device_T_display().
         */
        HomogenousMatrix4 device_T_display() const override;
 
        /**
         * Sets the transformation between display and device.
         * @see Framebuffer::setDevice_T_display().
         */
        bool setDevice_T_display(const HomogenousMatrix4& device_T_display) override;
 
        /**
         * Renders the next frame into the framebuffer.
         * @see Framebuffer::render().
         */
        void render() override;
 
        /**
         * Sets the platform dependent framebuffer base id or handle and initializes the framebuffer.
         * @see WindowFramebuffer::initializeById().
         */
        bool initializeById(const size_t id, const FramebufferRef& shareFramebuffer) override;
 
    private:
 
        /**
         * Creates a new window framebuffer.
         */
        GLESWindowFramebuffer();
 
        /**
         * Destructs a window framebuffer.
         */
        ~GLESWindowFramebuffer() override;
 
        /**
         * Initialize the OpenGL ES dispaly and context.
         * @return True, if succeeded
         */
        bool initializeContext() override;
 
        /**
         * This virtual function is called whenever the widget needs to be painted.
         * @see QOpenGLWidget::paintGL().
         */
        void paintGL() override;
 
        /**
         * This virtual function is called whenever the widget has been resized.
         * @see QOpenGLWidget::resizeGL().
         */
        void resizeGL(int width, int height) override;
 
        /**
         * This virtual function is called once before the first call to paintGL() or resizeGL().
         * @see QOpenGLWidget::initializeGL().
         */
        void initializeGL() override;
 
    protected:
 
        /// The transformation between display and device.
        HomogenousMatrix4 device_T_display_ = HomogenousMatrix4(true);
 
        /// The previous devicePixelRatio, e.g., is > 1 on Apple's retina desplays.
        int previousDevicePixelRatio_ = 0;
};
 
}
 
}
 
}
 
}
 
#endif // META_OCEAN_RENDERING_GLES_QT_GLES_WINDOW_FRAMEBUFFER_H