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// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#ifndef WINDOW_H
#define WINDOW_H
#include <QWindow>
#include <QOffscreenSurface>
#include <rhi/qrhi.h>
class RhiWindow : public QWindow
{
public:
RhiWindow(QRhi::Implementation graphicsApi);
QString graphicsApiName() const;
void releaseSwapChain();
protected:
virtual void customInit() = 0;
virtual void customRender() = 0;
// destruction order matters to a certain degree: the fallbackSurface must
// outlive the rhi, the rhi must outlive all other resources. The resources
// need no special order when destroying.
#if QT_CONFIG(opengl)
std::unique_ptr<QOffscreenSurface> m_fallbackSurface;
#endif
std::unique_ptr<QRhi> m_rhi;
//! [swapchain-data]
std::unique_ptr<QRhiSwapChain> m_sc;
std::unique_ptr<QRhiRenderBuffer> m_ds;
std::unique_ptr<QRhiRenderPassDescriptor> m_rp;
//! [swapchain-data]
bool m_hasSwapChain = false;
QMatrix4x4 m_viewProjection;
private:
void init();
void resizeSwapChain();
void render();
void exposeEvent(QExposeEvent *) override;
bool event(QEvent *) override;
QRhi::Implementation m_graphicsApi;
bool m_initialized = false;
bool m_notExposed = false;
bool m_newlyExposed = false;
};
class HelloWindow : public RhiWindow
{
public:
HelloWindow(QRhi::Implementation graphicsApi);
void customInit() override;
void customRender() override;
private:
void ensureFullscreenTexture(const QSize &pixelSize, QRhiResourceUpdateBatch *u);
std::unique_ptr<QRhiBuffer> m_vbuf;
std::unique_ptr<QRhiBuffer> m_ubuf;
std::unique_ptr<QRhiTexture> m_texture;
std::unique_ptr<QRhiSampler> m_sampler;
std::unique_ptr<QRhiShaderResourceBindings> m_colorTriSrb;
std::unique_ptr<QRhiGraphicsPipeline> m_colorPipeline;
std::unique_ptr<QRhiShaderResourceBindings> m_fullscreenQuadSrb;
std::unique_ptr<QRhiGraphicsPipeline> m_fullscreenQuadPipeline;
QRhiResourceUpdateBatch *m_initialUpdates = nullptr;
float m_rotation = 0;
float m_opacity = 1;
int m_opacityDir = -1;
};
#endif
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