qt-everywhere-src-5.15.1/qtdeclarative/examples/quick/scenegraph/d3d11underqml/d3d11squircle.cpp - orbit - Git at Google

 /****************************************************************************
 **
 ** Copyright (C) 2019 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the demonstration applications of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** Commercial License Usage
 ** Licensees holding valid commercial Qt licenses may use this file in
 ** accordance with the commercial license agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and The Qt Company. For licensing terms
 ** and conditions see https://www.qt.io/terms-conditions. For further
 ** information use the contact form at https://www.qt.io/contact-us.
 **
 ** BSD License Usage
 ** Alternatively, you may use this file under the terms of the BSD license
 ** as follows:
 **
 ** "Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of The Qt Company Ltd nor the names of its
 **     contributors may be used to endorse or promote products derived
 **     from this software without specific prior written permission.
 **
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include "d3d11squircle.h"
 #include <QtCore/QFile>
 #include <QtCore/QRunnable>
 #include <QtQuick/QQuickWindow>

 #include <d3d11.h>
 #include <d3dcompiler.h>

 class SquircleRenderer : public QObject
 {
     Q_OBJECT
 public:
     SquircleRenderer();
     ~SquircleRenderer();

     void setT(qreal t) { m_t = t; }
     void setViewportSize(const QSize &size) { m_viewportSize = size; }
     void setWindow(QQuickWindow *window) { m_window = window; }

 public slots:
     void frameStart();
     void mainPassRecordingStart();

 private:
     enum Stage {
         VertexStage,
         FragmentStage
     };
     void prepareShader(Stage stage);
     QByteArray compileShader(Stage stage,
                              const QByteArray &source,
                              const QByteArray &entryPoint);
     void init();

     QSize m_viewportSize;
     qreal m_t;
     QQuickWindow *m_window;

     ID3D11Device *m_device = nullptr;
     ID3D11DeviceContext *m_context = nullptr;
     QByteArray m_vert;
     QByteArray m_vertEntryPoint;
     QByteArray m_frag;
     QByteArray m_fragEntryPoint;

     bool m_initialized = false;
     ID3D11Buffer *m_vbuf = nullptr;
     ID3D11Buffer *m_cbuf = nullptr;
     ID3D11VertexShader *m_vs = nullptr;
     ID3D11PixelShader *m_ps = nullptr;
     ID3D11InputLayout *m_inputLayout = nullptr;
     ID3D11RasterizerState *m_rastState = nullptr;
     ID3D11DepthStencilState *m_dsState = nullptr;
     ID3D11BlendState *m_blendState = nullptr;
 };

 D3D11Squircle::D3D11Squircle()
     : m_t(0)
     , m_renderer(nullptr)
 {
     connect(this, &QQuickItem::windowChanged, this, &D3D11Squircle::handleWindowChanged);
 }

 void D3D11Squircle::setT(qreal t)
 {
     if (t == m_t)
         return;
     m_t = t;
     emit tChanged();
     if (window())
         window()->update();
 }

 void D3D11Squircle::handleWindowChanged(QQuickWindow *win)
 {
     if (win) {
         connect(win, &QQuickWindow::beforeSynchronizing, this, &D3D11Squircle::sync, Qt::DirectConnection);
         connect(win, &QQuickWindow::sceneGraphInvalidated, this, &D3D11Squircle::cleanup, Qt::DirectConnection);

         // Ensure we start with cleared to black. The squircle's blend mode relies on this.
         win->setColor(Qt::black);
     }
 }

 SquircleRenderer::SquircleRenderer()
     : m_t(0)
 {
 }

 // The safe way to release custom graphics resources it to both connect to
 // sceneGraphInvalidated() and implement releaseResources(). To support
 // threaded render loops the latter performs the SquircleRenderer destruction
 // via scheduleRenderJob(). Note that the D3D11Squircle may be gone by the time
 // the QRunnable is invoked.

 void D3D11Squircle::cleanup()
 {
     delete m_renderer;
     m_renderer = nullptr;
 }

 class CleanupJob : public QRunnable
 {
 public:
     CleanupJob(SquircleRenderer *renderer) : m_renderer(renderer) { }
     void run() override { delete m_renderer; }
 private:
     SquircleRenderer *m_renderer;
 };

 void D3D11Squircle::releaseResources()
 {
     window()->scheduleRenderJob(new CleanupJob(m_renderer), QQuickWindow::BeforeSynchronizingStage);
     m_renderer = nullptr;
 }

 SquircleRenderer::~SquircleRenderer()
 {
     qDebug("cleanup");

     if (m_vs)
         m_vs->Release();

     if (m_ps)
         m_ps->Release();

     if (m_vbuf)
         m_vbuf->Release();

     if (m_cbuf)
         m_cbuf->Release();

     if (m_inputLayout)
         m_inputLayout->Release();

     if (m_rastState)
         m_rastState->Release();

     if (m_dsState)
         m_dsState->Release();

     if (m_blendState)
         m_blendState->Release();
 }

 void D3D11Squircle::sync()
 {
     if (!m_renderer) {
         m_renderer = new SquircleRenderer;
         connect(window(), &QQuickWindow::beforeRendering, m_renderer, &SquircleRenderer::frameStart, Qt::DirectConnection);
         connect(window(), &QQuickWindow::beforeRenderPassRecording, m_renderer, &SquircleRenderer::mainPassRecordingStart, Qt::DirectConnection);
     }
     m_renderer->setViewportSize(window()->size() * window()->devicePixelRatio());
     m_renderer->setT(m_t);
     m_renderer->setWindow(window());
 }

 void SquircleRenderer::frameStart()
 {
     QSGRendererInterface *rif = m_window->rendererInterface();

     // We are not prepared for anything other than running with the RHI and its D3D11 backend.
     Q_ASSERT(rif->graphicsApi() == QSGRendererInterface::Direct3D11Rhi);

     m_device = reinterpret_cast<ID3D11Device *>(rif->getResource(m_window, QSGRendererInterface::DeviceResource));
     Q_ASSERT(m_device);
     m_context = reinterpret_cast<ID3D11DeviceContext *>(rif->getResource(m_window, QSGRendererInterface::DeviceContextResource));
     Q_ASSERT(m_context);

     if (m_vert.isEmpty())
         prepareShader(VertexStage);
     if (m_frag.isEmpty())
         prepareShader(FragmentStage);

     if (!m_initialized)
         init();
 }

 static const float vertices[] = {
     -1, -1,
     1, -1,
     -1, 1,
     1, 1
 };

 void SquircleRenderer::mainPassRecordingStart()
 {
     m_window->beginExternalCommands();

     D3D11_MAPPED_SUBRESOURCE mp;
     // will copy the entire constant buffer every time -> pass WRITE_DISCARD -> prevent pipeline stalls
     HRESULT hr = m_context->Map(m_cbuf, 0, D3D11_MAP_WRITE_DISCARD, 0, &mp);
     if (SUCCEEDED(hr)) {
         float t = m_t;
         memcpy(mp.pData, &t, 4);
         m_context->Unmap(m_cbuf, 0);
     } else {
         qFatal("Failed to map constant buffer: 0x%x", hr);
     }

     D3D11_VIEWPORT v;
     v.TopLeftX = 0;
     v.TopLeftY = 0;
     v.Width = m_viewportSize.width();
     v.Height = m_viewportSize.height();
     v.MinDepth = 0;
     v.MaxDepth = 1;
     m_context->RSSetViewports(1, &v);

     m_context->VSSetShader(m_vs, nullptr, 0);
     m_context->PSSetShader(m_ps, nullptr, 0);
     m_context->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLESTRIP);
     m_context->IASetInputLayout(m_inputLayout);
     m_context->OMSetDepthStencilState(m_dsState, 0);
     float blendConstants[] = { 1, 1, 1, 1 };
     m_context->OMSetBlendState(m_blendState, blendConstants, 0xFFFFFFFF);
     m_context->RSSetState(m_rastState);

     const UINT stride = 2 * sizeof(float); // vec2
     const UINT offset = 0;
     m_context->IASetVertexBuffers(0, 1, &m_vbuf, &stride, &offset);
     m_context->PSSetConstantBuffers(0, 1, &m_cbuf);

     m_context->Draw(4, 0);

     m_window->endExternalCommands();
 }

 void SquircleRenderer::prepareShader(Stage stage)
 {
     QString filename;
     if (stage == VertexStage) {
         filename = QLatin1String(":/scenegraph/d3d11underqml/squircle.vert");
     } else {
         Q_ASSERT(stage == FragmentStage);
         filename = QLatin1String(":/scenegraph/d3d11underqml/squircle.frag");
     }
     QFile f(filename);
     if (!f.open(QIODevice::ReadOnly))
         qFatal("Failed to read shader %s", qPrintable(filename));

     const QByteArray contents = f.readAll();

     if (stage == VertexStage) {
         m_vert = contents;
         Q_ASSERT(!m_vert.isEmpty());
         m_vertEntryPoint = QByteArrayLiteral("main");
     } else {
         m_frag = contents;
         Q_ASSERT(!m_frag.isEmpty());
         m_fragEntryPoint = QByteArrayLiteral("main");
     }
 }

 QByteArray SquircleRenderer::compileShader(Stage stage,
                                            const QByteArray &source,
                                            const QByteArray &entryPoint)
 {
     const char *target;
     switch (stage) {
     case VertexStage:
         target = "vs_5_0";
         break;
     case FragmentStage:
         target = "ps_5_0";
         break;
     default:
         qFatal("Unknown shader stage %d", stage);
         return QByteArray();
     }

     ID3DBlob *bytecode = nullptr;
     ID3DBlob *errors = nullptr;
     HRESULT hr = D3DCompile(source.constData(), source.size(),
                             nullptr, nullptr, nullptr,
                             entryPoint.constData(), target, 0, 0, &bytecode, &errors);
     if (FAILED(hr) || !bytecode) {
         qWarning("HLSL shader compilation failed: 0x%x", uint(hr));
         if (errors) {
             const QByteArray msg(static_cast<const char *>(errors->GetBufferPointer()),
                                  errors->GetBufferSize());
             errors->Release();
             qWarning("%s", msg.constData());
         }
         return QByteArray();
     }

     QByteArray result;
     result.resize(bytecode->GetBufferSize());
     memcpy(result.data(), bytecode->GetBufferPointer(), result.size());
     bytecode->Release();

     return result;
 }

 void SquircleRenderer::init()
 {
     qDebug("init");
     m_initialized = true;

     const QByteArray vs = compileShader(VertexStage, m_vert, m_vertEntryPoint);
     const QByteArray fs = compileShader(FragmentStage, m_frag, m_fragEntryPoint);

     HRESULT hr = m_device->CreateVertexShader(vs.constData(), vs.size(), nullptr, &m_vs);
     if (FAILED(hr))
         qFatal("Failed to create vertex shader: 0x%x", hr);

     hr = m_device->CreatePixelShader(fs.constData(), fs.size(), nullptr, &m_ps);
     if (FAILED(hr))
         qFatal("Failed to create pixel shader: 0x%x", hr);

     D3D11_BUFFER_DESC bufDesc;
     memset(&bufDesc, 0, sizeof(bufDesc));
     bufDesc.ByteWidth = sizeof(vertices);
     bufDesc.Usage = D3D11_USAGE_DEFAULT;
     bufDesc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
     hr = m_device->CreateBuffer(&bufDesc, nullptr, &m_vbuf);
     if (FAILED(hr))
         qFatal("Failed to create buffer: 0x%x", hr);

     m_context->UpdateSubresource(m_vbuf, 0, nullptr, vertices, 0, 0);

     bufDesc.ByteWidth = 256;
     bufDesc.Usage = D3D11_USAGE_DYNAMIC;
     bufDesc.BindFlags = D3D11_BIND_CONSTANT_BUFFER;
     bufDesc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
     hr = m_device->CreateBuffer(&bufDesc, nullptr, &m_cbuf);
     if (FAILED(hr))
         qFatal("Failed to create buffer: 0x%x", hr);

     D3D11_INPUT_ELEMENT_DESC inputDesc;
     memset(&inputDesc, 0, sizeof(inputDesc));
     // the output from SPIRV-Cross uses TEXCOORD<location> as the semantic
     inputDesc.SemanticName = "TEXCOORD";
     inputDesc.SemanticIndex = 0;
     inputDesc.Format = DXGI_FORMAT_R32G32_FLOAT; // vec2
     inputDesc.InputSlot = 0;
     inputDesc.AlignedByteOffset = 0;
     inputDesc.InputSlotClass = D3D11_INPUT_PER_VERTEX_DATA;
     hr = m_device->CreateInputLayout(&inputDesc, 1, vs.constData(), vs.size(), &m_inputLayout);
     if (FAILED(hr))
         qFatal("Failed to create input layout: 0x%x", hr);

     D3D11_RASTERIZER_DESC rastDesc;
     memset(&rastDesc, 0, sizeof(rastDesc));
     rastDesc.FillMode = D3D11_FILL_SOLID;
     rastDesc.CullMode = D3D11_CULL_NONE;
     hr = m_device->CreateRasterizerState(&rastDesc, &m_rastState);
     if (FAILED(hr))
         qFatal("Failed to create rasterizer state: 0x%x", hr);

     D3D11_DEPTH_STENCIL_DESC dsDesc;
     memset(&dsDesc, 0, sizeof(dsDesc));
     hr = m_device->CreateDepthStencilState(&dsDesc, &m_dsState);
     if (FAILED(hr))
         qFatal("Failed to create depth/stencil state: 0x%x", hr);

     D3D11_BLEND_DESC blendDesc;
     memset(&blendDesc, 0, sizeof(blendDesc));
     blendDesc.IndependentBlendEnable = true;
     D3D11_RENDER_TARGET_BLEND_DESC blend;
     memset(&blend, 0, sizeof(blend));
     blend.BlendEnable = true;
     blend.SrcBlend = D3D11_BLEND_SRC_ALPHA;
     blend.DestBlend = D3D11_BLEND_ONE;
     blend.BlendOp = D3D11_BLEND_OP_ADD;
     blend.SrcBlendAlpha = D3D11_BLEND_SRC_ALPHA;
     blend.DestBlendAlpha = D3D11_BLEND_ONE;
     blend.BlendOpAlpha = D3D11_BLEND_OP_ADD;
     blend.RenderTargetWriteMask = D3D11_COLOR_WRITE_ENABLE_ALL;
     blendDesc.RenderTarget[0] = blend;
     hr = m_device->CreateBlendState(&blendDesc, &m_blendState);
     if (FAILED(hr))
         qFatal("Failed to create blend state: 0x%x", hr);
 }

 #include "d3d11squircle.moc"
	/****************************************************************************
	**
	** Copyright (C) 2019 The Qt Company Ltd.
	** Contact: https://www.qt.io/licensing/
	**
	** This file is part of the demonstration applications of the Qt Toolkit.
	**
	** $QT_BEGIN_LICENSE:BSD$
	** Commercial License Usage
	** Licensees holding valid commercial Qt licenses may use this file in
	** accordance with the commercial license agreement provided with the
	** Software or, alternatively, in accordance with the terms contained in
	** a written agreement between you and The Qt Company. For licensing terms
	** and conditions see https://www.qt.io/terms-conditions. For further
	** information use the contact form at https://www.qt.io/contact-us.
	**
	** BSD License Usage
	** Alternatively, you may use this file under the terms of the BSD license
	** as follows:
	**
	** "Redistribution and use in source and binary forms, with or without
	** modification, are permitted provided that the following conditions are
	** met:
	** * Redistributions of source code must retain the above copyright
	** notice, this list of conditions and the following disclaimer.
	** * Redistributions in binary form must reproduce the above copyright
	** notice, this list of conditions and the following disclaimer in
	** the documentation and/or other materials provided with the
	** distribution.
	** * Neither the name of The Qt Company Ltd nor the names of its
	** contributors may be used to endorse or promote products derived
	** from this software without specific prior written permission.
	**
	**
	** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
	**
	** $QT_END_LICENSE$
	**
	****************************************************************************/

	#include "d3d11squircle.h"
	#include <QtCore/QFile>
	#include <QtCore/QRunnable>
	#include <QtQuick/QQuickWindow>

	#include <d3d11.h>
	#include <d3dcompiler.h>

	class SquircleRenderer : public QObject
	{
	Q_OBJECT
	public:
	SquircleRenderer();
	~SquircleRenderer();

	void setT(qreal t) { m_t = t; }
	void setViewportSize(const QSize &size) { m_viewportSize = size; }
	void setWindow(QQuickWindow *window) { m_window = window; }

	public slots:
	void frameStart();
	void mainPassRecordingStart();

	private:
	enum Stage {
	VertexStage,
	FragmentStage
	};
	void prepareShader(Stage stage);
	QByteArray compileShader(Stage stage,
	const QByteArray &source,
	const QByteArray &entryPoint);
	void init();

	QSize m_viewportSize;
	qreal m_t;
	QQuickWindow *m_window;

	ID3D11Device *m_device = nullptr;
	ID3D11DeviceContext *m_context = nullptr;
	QByteArray m_vert;
	QByteArray m_vertEntryPoint;
	QByteArray m_frag;
	QByteArray m_fragEntryPoint;

	bool m_initialized = false;
	ID3D11Buffer *m_vbuf = nullptr;
	ID3D11Buffer *m_cbuf = nullptr;
	ID3D11VertexShader *m_vs = nullptr;
	ID3D11PixelShader *m_ps = nullptr;
	ID3D11InputLayout *m_inputLayout = nullptr;
	ID3D11RasterizerState *m_rastState = nullptr;
	ID3D11DepthStencilState *m_dsState = nullptr;
	ID3D11BlendState *m_blendState = nullptr;
	};

	D3D11Squircle::D3D11Squircle()
	: m_t(0)
	, m_renderer(nullptr)
	{
	connect(this, &QQuickItem::windowChanged, this, &D3D11Squircle::handleWindowChanged);
	}

	void D3D11Squircle::setT(qreal t)
	{
	if (t == m_t)
	return;
	m_t = t;
	emit tChanged();
	if (window())
	window()->update();
	}

	void D3D11Squircle::handleWindowChanged(QQuickWindow *win)
	{
	if (win) {
	connect(win, &QQuickWindow::beforeSynchronizing, this, &D3D11Squircle::sync, Qt::DirectConnection);
	connect(win, &QQuickWindow::sceneGraphInvalidated, this, &D3D11Squircle::cleanup, Qt::DirectConnection);

	// Ensure we start with cleared to black. The squircle's blend mode relies on this.
	win->setColor(Qt::black);
	}
	}

	SquircleRenderer::SquircleRenderer()
	: m_t(0)
	{
	}

	// The safe way to release custom graphics resources it to both connect to
	// sceneGraphInvalidated() and implement releaseResources(). To support
	// threaded render loops the latter performs the SquircleRenderer destruction
	// via scheduleRenderJob(). Note that the D3D11Squircle may be gone by the time
	// the QRunnable is invoked.

	void D3D11Squircle::cleanup()
	{
	delete m_renderer;
	m_renderer = nullptr;
	}

	class CleanupJob : public QRunnable
	{
	public:
	CleanupJob(SquircleRenderer *renderer) : m_renderer(renderer) { }
	void run() override { delete m_renderer; }
	private:
	SquircleRenderer *m_renderer;
	};

	void D3D11Squircle::releaseResources()
	{
	window()->scheduleRenderJob(new CleanupJob(m_renderer), QQuickWindow::BeforeSynchronizingStage);
	m_renderer = nullptr;
	}

	SquircleRenderer::~SquircleRenderer()
	{
	qDebug("cleanup");

	if (m_vs)
	m_vs->Release();

	if (m_ps)
	m_ps->Release();

	if (m_vbuf)
	m_vbuf->Release();

	if (m_cbuf)
	m_cbuf->Release();

	if (m_inputLayout)
	m_inputLayout->Release();

	if (m_rastState)
	m_rastState->Release();

	if (m_dsState)
	m_dsState->Release();

	if (m_blendState)
	m_blendState->Release();
	}

	void D3D11Squircle::sync()
	{
	if (!m_renderer) {
	m_renderer = new SquircleRenderer;
	connect(window(), &QQuickWindow::beforeRendering, m_renderer, &SquircleRenderer::frameStart, Qt::DirectConnection);
	connect(window(), &QQuickWindow::beforeRenderPassRecording, m_renderer, &SquircleRenderer::mainPassRecordingStart, Qt::DirectConnection);
	}
	m_renderer->setViewportSize(window()->size() * window()->devicePixelRatio());
	m_renderer->setT(m_t);
	m_renderer->setWindow(window());
	}

	void SquircleRenderer::frameStart()
	{
	QSGRendererInterface *rif = m_window->rendererInterface();

	// We are not prepared for anything other than running with the RHI and its D3D11 backend.
	Q_ASSERT(rif->graphicsApi() == QSGRendererInterface::Direct3D11Rhi);

	m_device = reinterpret_cast<ID3D11Device *>(rif->getResource(m_window, QSGRendererInterface::DeviceResource));
	Q_ASSERT(m_device);
	m_context = reinterpret_cast<ID3D11DeviceContext *>(rif->getResource(m_window, QSGRendererInterface::DeviceContextResource));
	Q_ASSERT(m_context);

	if (m_vert.isEmpty())
	prepareShader(VertexStage);
	if (m_frag.isEmpty())
	prepareShader(FragmentStage);

	if (!m_initialized)
	init();
	}

	static const float vertices[] = {
	-1, -1,
	1, -1,
	-1, 1,
	1, 1
	};

	void SquircleRenderer::mainPassRecordingStart()
	{
	m_window->beginExternalCommands();

	D3D11_MAPPED_SUBRESOURCE mp;
	// will copy the entire constant buffer every time -> pass WRITE_DISCARD -> prevent pipeline stalls
	HRESULT hr = m_context->Map(m_cbuf, 0, D3D11_MAP_WRITE_DISCARD, 0, &mp);
	if (SUCCEEDED(hr)) {
	float t = m_t;
	memcpy(mp.pData, &t, 4);
	m_context->Unmap(m_cbuf, 0);
	} else {
	qFatal("Failed to map constant buffer: 0x%x", hr);
	}

	D3D11_VIEWPORT v;
	v.TopLeftX = 0;
	v.TopLeftY = 0;
	v.Width = m_viewportSize.width();
	v.Height = m_viewportSize.height();
	v.MinDepth = 0;
	v.MaxDepth = 1;
	m_context->RSSetViewports(1, &v);

	m_context->VSSetShader(m_vs, nullptr, 0);
	m_context->PSSetShader(m_ps, nullptr, 0);
	m_context->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLESTRIP);
	m_context->IASetInputLayout(m_inputLayout);
	m_context->OMSetDepthStencilState(m_dsState, 0);
	float blendConstants[] = { 1, 1, 1, 1 };
	m_context->OMSetBlendState(m_blendState, blendConstants, 0xFFFFFFFF);
	m_context->RSSetState(m_rastState);

	const UINT stride = 2 * sizeof(float); // vec2
	const UINT offset = 0;
	m_context->IASetVertexBuffers(0, 1, &m_vbuf, &stride, &offset);
	m_context->PSSetConstantBuffers(0, 1, &m_cbuf);

	m_context->Draw(4, 0);

	m_window->endExternalCommands();
	}

	void SquircleRenderer::prepareShader(Stage stage)
	{
	QString filename;
	if (stage == VertexStage) {
	filename = QLatin1String(":/scenegraph/d3d11underqml/squircle.vert");
	} else {
	Q_ASSERT(stage == FragmentStage);
	filename = QLatin1String(":/scenegraph/d3d11underqml/squircle.frag");
	}
	QFile f(filename);
	if (!f.open(QIODevice::ReadOnly))
	qFatal("Failed to read shader %s", qPrintable(filename));

	const QByteArray contents = f.readAll();

	if (stage == VertexStage) {
	m_vert = contents;
	Q_ASSERT(!m_vert.isEmpty());
	m_vertEntryPoint = QByteArrayLiteral("main");
	} else {
	m_frag = contents;
	Q_ASSERT(!m_frag.isEmpty());
	m_fragEntryPoint = QByteArrayLiteral("main");
	}
	}

	QByteArray SquircleRenderer::compileShader(Stage stage,
	const QByteArray &source,
	const QByteArray &entryPoint)
	{
	const char *target;
	switch (stage) {
	case VertexStage:
	target = "vs_5_0";
	break;
	case FragmentStage:
	target = "ps_5_0";
	break;
	default:
	qFatal("Unknown shader stage %d", stage);
	return QByteArray();
	}

	ID3DBlob *bytecode = nullptr;
	ID3DBlob *errors = nullptr;
	HRESULT hr = D3DCompile(source.constData(), source.size(),
	nullptr, nullptr, nullptr,
	entryPoint.constData(), target, 0, 0, &bytecode, &errors);
	if (FAILED(hr) \|\| !bytecode) {
	qWarning("HLSL shader compilation failed: 0x%x", uint(hr));
	if (errors) {
	const QByteArray msg(static_cast<const char *>(errors->GetBufferPointer()),
	errors->GetBufferSize());
	errors->Release();
	qWarning("%s", msg.constData());
	}
	return QByteArray();
	}

	QByteArray result;
	result.resize(bytecode->GetBufferSize());
	memcpy(result.data(), bytecode->GetBufferPointer(), result.size());
	bytecode->Release();

	return result;
	}

	void SquircleRenderer::init()
	{
	qDebug("init");
	m_initialized = true;

	const QByteArray vs = compileShader(VertexStage, m_vert, m_vertEntryPoint);
	const QByteArray fs = compileShader(FragmentStage, m_frag, m_fragEntryPoint);

	HRESULT hr = m_device->CreateVertexShader(vs.constData(), vs.size(), nullptr, &m_vs);
	if (FAILED(hr))
	qFatal("Failed to create vertex shader: 0x%x", hr);

	hr = m_device->CreatePixelShader(fs.constData(), fs.size(), nullptr, &m_ps);
	if (FAILED(hr))
	qFatal("Failed to create pixel shader: 0x%x", hr);

	D3D11_BUFFER_DESC bufDesc;
	memset(&bufDesc, 0, sizeof(bufDesc));
	bufDesc.ByteWidth = sizeof(vertices);
	bufDesc.Usage = D3D11_USAGE_DEFAULT;
	bufDesc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
	hr = m_device->CreateBuffer(&bufDesc, nullptr, &m_vbuf);
	if (FAILED(hr))
	qFatal("Failed to create buffer: 0x%x", hr);

	m_context->UpdateSubresource(m_vbuf, 0, nullptr, vertices, 0, 0);

	bufDesc.ByteWidth = 256;
	bufDesc.Usage = D3D11_USAGE_DYNAMIC;
	bufDesc.BindFlags = D3D11_BIND_CONSTANT_BUFFER;
	bufDesc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
	hr = m_device->CreateBuffer(&bufDesc, nullptr, &m_cbuf);
	if (FAILED(hr))
	qFatal("Failed to create buffer: 0x%x", hr);

	D3D11_INPUT_ELEMENT_DESC inputDesc;
	memset(&inputDesc, 0, sizeof(inputDesc));
	// the output from SPIRV-Cross uses TEXCOORD<location> as the semantic
	inputDesc.SemanticName = "TEXCOORD";
	inputDesc.SemanticIndex = 0;
	inputDesc.Format = DXGI_FORMAT_R32G32_FLOAT; // vec2
	inputDesc.InputSlot = 0;
	inputDesc.AlignedByteOffset = 0;
	inputDesc.InputSlotClass = D3D11_INPUT_PER_VERTEX_DATA;
	hr = m_device->CreateInputLayout(&inputDesc, 1, vs.constData(), vs.size(), &m_inputLayout);
	if (FAILED(hr))
	qFatal("Failed to create input layout: 0x%x", hr);

	D3D11_RASTERIZER_DESC rastDesc;
	memset(&rastDesc, 0, sizeof(rastDesc));
	rastDesc.FillMode = D3D11_FILL_SOLID;
	rastDesc.CullMode = D3D11_CULL_NONE;
	hr = m_device->CreateRasterizerState(&rastDesc, &m_rastState);
	if (FAILED(hr))
	qFatal("Failed to create rasterizer state: 0x%x", hr);

	D3D11_DEPTH_STENCIL_DESC dsDesc;
	memset(&dsDesc, 0, sizeof(dsDesc));
	hr = m_device->CreateDepthStencilState(&dsDesc, &m_dsState);
	if (FAILED(hr))
	qFatal("Failed to create depth/stencil state: 0x%x", hr);

	D3D11_BLEND_DESC blendDesc;
	memset(&blendDesc, 0, sizeof(blendDesc));
	blendDesc.IndependentBlendEnable = true;
	D3D11_RENDER_TARGET_BLEND_DESC blend;
	memset(&blend, 0, sizeof(blend));
	blend.BlendEnable = true;
	blend.SrcBlend = D3D11_BLEND_SRC_ALPHA;
	blend.DestBlend = D3D11_BLEND_ONE;
	blend.BlendOp = D3D11_BLEND_OP_ADD;
	blend.SrcBlendAlpha = D3D11_BLEND_SRC_ALPHA;
	blend.DestBlendAlpha = D3D11_BLEND_ONE;
	blend.BlendOpAlpha = D3D11_BLEND_OP_ADD;
	blend.RenderTargetWriteMask = D3D11_COLOR_WRITE_ENABLE_ALL;
	blendDesc.RenderTarget[0] = blend;
	hr = m_device->CreateBlendState(&blendDesc, &m_blendState);
	if (FAILED(hr))
	qFatal("Failed to create blend state: 0x%x", hr);
	}

	#include "d3d11squircle.moc"