qt-everywhere-src-5.14.1/qtdeclarative/examples/quick/scenegraph/metalunderqml/metalsquircle.mm - 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 "metalsquircle.h"
 #include <QtCore/QRunnable>
 #include <QtQuick/QQuickWindow>

 #include <Metal/Metal.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);
     using FuncAndLib = QPair<id<MTLFunction>, id<MTLLibrary> >;
     FuncAndLib compileShaderFromSource(const QByteArray &src, const QByteArray &entryPoint);
     void init(int framesInFlight);

     QSize m_viewportSize;
     qreal m_t;
     QQuickWindow *m_window;

     QByteArray m_vert;
     QByteArray m_vertEntryPoint;
     QByteArray m_frag;
     QByteArray m_fragEntryPoint;

     bool m_initialized = false;
     id<MTLDevice> m_device;
     id<MTLBuffer> m_vbuf;
     id<MTLBuffer> m_ubuf[3];
     FuncAndLib m_vs;
     FuncAndLib m_fs;
     id<MTLRenderPipelineState> m_pipeline;
 };

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

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

 void MetalSquircle::handleWindowChanged(QQuickWindow *win)
 {
     if (win) {
         connect(win, &QQuickWindow::beforeSynchronizing, this, &MetalSquircle::sync, Qt::DirectConnection);
         connect(win, &QQuickWindow::sceneGraphInvalidated, this, &MetalSquircle::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)
 {
     m_vbuf = nil;

     for (int i = 0; i < 3; ++i)
         m_ubuf[i] = nil;

     m_vs.first = nil;
     m_vs.second = nil;

     m_fs.first = nil;
     m_fs.second = nil;
 }

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

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

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

     [m_vbuf release];
     for (int i = 0; i < 3; ++i)
         [m_ubuf[i] release];

     [m_vs.first release];
     [m_vs.second release];

     [m_fs.first release];
     [m_fs.second release];
 }

 void MetalSquircle::sync()
 {
     if (!m_renderer) {
         m_renderer = new SquircleRenderer;
         // Initializing resources is done before starting to encode render
         // commands, regardless of wanting an underlay or overlay.
         connect(window(), &QQuickWindow::beforeRendering, m_renderer, &SquircleRenderer::frameStart, Qt::DirectConnection);
         // Here we want an underlay and therefore connect to
         // beforeRenderPassRecording. Changing to afterRenderPassRecording
         // would render the squircle on top (overlay).
         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 Metal backend.
     Q_ASSERT(rif->graphicsApi() == QSGRendererInterface::MetalRhi);

     m_device = (id<MTLDevice>) rif->getResource(m_window, QSGRendererInterface::DeviceResource);
     Q_ASSERT(m_device);

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

     if (!m_initialized)
         init(m_window->graphicsStateInfo().framesInFlight);
 }

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

 const int UBUF_SIZE = 4;

 void SquircleRenderer::mainPassRecordingStart()
 {
     // This example demonstrates the simple case: prepending some commands to
     // the scenegraph's main renderpass. It does not create its own passes,
     // rendertargets, etc. so no synchronization is needed.

     const QQuickWindow::GraphicsStateInfo &stateInfo(m_window->graphicsStateInfo());

     QSGRendererInterface *rif = m_window->rendererInterface();
     id<MTLRenderCommandEncoder> encoder = (id<MTLRenderCommandEncoder>) rif->getResource(
                 m_window, QSGRendererInterface::CommandEncoderResource);
     Q_ASSERT(encoder);

     m_window->beginExternalCommands();

     void *p = [m_ubuf[stateInfo.currentFrameSlot] contents];
     float t = m_t;
     memcpy(p, &t, 4);

     MTLViewport vp;
     vp.originX = 0;
     vp.originY = 0;
     vp.width = m_viewportSize.width();
     vp.height = m_viewportSize.height();
     vp.znear = 0;
     vp.zfar = 1;
     [encoder setViewport: vp];

     [encoder setFragmentBuffer: m_ubuf[stateInfo.currentFrameSlot] offset: 0 atIndex: 0];
     [encoder setVertexBuffer: m_vbuf offset: 0 atIndex: 1];
     [encoder setRenderPipelineState: m_pipeline];
     [encoder drawPrimitives: MTLPrimitiveTypeTriangleStrip vertexStart: 0 vertexCount: 4 instanceCount: 1 baseInstance: 0];

     m_window->endExternalCommands();
 }

 void SquircleRenderer::prepareShader(Stage stage)
 {
     QString filename;
     if (stage == VertexStage) {
         filename = QLatin1String(":/scenegraph/metalunderqml/squircle.vert");
     } else {
         Q_ASSERT(stage == FragmentStage);
         filename = QLatin1String(":/scenegraph/metalunderqml/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("main0");
     } else {
         m_frag = contents;
         Q_ASSERT(!m_frag.isEmpty());
         m_fragEntryPoint = QByteArrayLiteral("main0");
     }
 }

 SquircleRenderer::FuncAndLib SquircleRenderer::compileShaderFromSource(const QByteArray &src, const QByteArray &entryPoint)
 {
     FuncAndLib fl;

     NSString *srcstr = [NSString stringWithUTF8String: src.constData()];
     MTLCompileOptions *opts = [[MTLCompileOptions alloc] init];
     opts.languageVersion = MTLLanguageVersion1_2;
     NSError *err = nil;
     fl.second = [m_device newLibraryWithSource: srcstr options: opts error: &err];
     [opts release];
     // srcstr is autoreleased

     if (err) {
         const QString msg = QString::fromNSString(err.localizedDescription);
         qFatal("%s", qPrintable(msg));
         return fl;
     }

     NSString *name = [NSString stringWithUTF8String: entryPoint.constData()];
     fl.first = [fl.second newFunctionWithName: name];
     [name release];

     return fl;
 }

 void SquircleRenderer::init(int framesInFlight)
 {
     qDebug("init");

     Q_ASSERT(framesInFlight <= 3);
     m_initialized = true;

     m_vbuf = [m_device newBufferWithLength: sizeof(vertices) options: MTLResourceStorageModeShared];
     void *p = [m_vbuf contents];
     memcpy(p, vertices, sizeof(vertices));

     for (int i = 0; i < framesInFlight; ++i)
         m_ubuf[i] = [m_device newBufferWithLength: UBUF_SIZE options: MTLResourceStorageModeShared];

     MTLVertexDescriptor *inputLayout = [MTLVertexDescriptor vertexDescriptor];
     inputLayout.attributes[0].format = MTLVertexFormatFloat2;
     inputLayout.attributes[0].offset = 0;
     inputLayout.attributes[0].bufferIndex = 1; // ubuf is 0, vbuf is 1
     inputLayout.layouts[1].stride = 2 * sizeof(float);

     MTLRenderPipelineDescriptor *rpDesc = [[MTLRenderPipelineDescriptor alloc] init];
     rpDesc.vertexDescriptor = inputLayout;

     m_vs = compileShaderFromSource(m_vert, m_vertEntryPoint);
     rpDesc.vertexFunction = m_vs.first;
     m_fs = compileShaderFromSource(m_frag, m_fragEntryPoint);
     rpDesc.fragmentFunction = m_fs.first;

     rpDesc.colorAttachments[0].pixelFormat = MTLPixelFormatBGRA8Unorm;
     rpDesc.colorAttachments[0].blendingEnabled = true;
     rpDesc.colorAttachments[0].sourceRGBBlendFactor = MTLBlendFactorSourceAlpha;
     rpDesc.colorAttachments[0].sourceAlphaBlendFactor = MTLBlendFactorSourceAlpha;
     rpDesc.colorAttachments[0].destinationRGBBlendFactor = MTLBlendFactorOne;
     rpDesc.colorAttachments[0].destinationAlphaBlendFactor = MTLBlendFactorOne;

     if (m_device.depth24Stencil8PixelFormatSupported) {
         rpDesc.depthAttachmentPixelFormat = MTLPixelFormatDepth24Unorm_Stencil8;
         rpDesc.stencilAttachmentPixelFormat = MTLPixelFormatDepth24Unorm_Stencil8;
     } else {
         rpDesc.depthAttachmentPixelFormat = MTLPixelFormatDepth32Float_Stencil8;
         rpDesc.stencilAttachmentPixelFormat = MTLPixelFormatDepth32Float_Stencil8;
     }

     NSError *err = nil;
     m_pipeline = [m_device newRenderPipelineStateWithDescriptor: rpDesc error: &err];
     if (!m_pipeline) {
         const QString msg = QString::fromNSString(err.localizedDescription);
         qFatal("Failed to create render pipeline state: %s", qPrintable(msg));
     }
     [rpDesc release];
 }

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

	#include <Metal/Metal.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);
	using FuncAndLib = QPair<id<MTLFunction>, id<MTLLibrary> >;
	FuncAndLib compileShaderFromSource(const QByteArray &src, const QByteArray &entryPoint);
	void init(int framesInFlight);

	QSize m_viewportSize;
	qreal m_t;
	QQuickWindow *m_window;

	QByteArray m_vert;
	QByteArray m_vertEntryPoint;
	QByteArray m_frag;
	QByteArray m_fragEntryPoint;

	bool m_initialized = false;
	id<MTLDevice> m_device;
	id<MTLBuffer> m_vbuf;
	id<MTLBuffer> m_ubuf[3];
	FuncAndLib m_vs;
	FuncAndLib m_fs;
	id<MTLRenderPipelineState> m_pipeline;
	};

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

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

	void MetalSquircle::handleWindowChanged(QQuickWindow *win)
	{
	if (win) {
	connect(win, &QQuickWindow::beforeSynchronizing, this, &MetalSquircle::sync, Qt::DirectConnection);
	connect(win, &QQuickWindow::sceneGraphInvalidated, this, &MetalSquircle::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)
	{
	m_vbuf = nil;

	for (int i = 0; i < 3; ++i)
	m_ubuf[i] = nil;

	m_vs.first = nil;
	m_vs.second = nil;

	m_fs.first = nil;
	m_fs.second = nil;
	}

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

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

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

	[m_vbuf release];
	for (int i = 0; i < 3; ++i)
	[m_ubuf[i] release];

	[m_vs.first release];
	[m_vs.second release];

	[m_fs.first release];
	[m_fs.second release];
	}

	void MetalSquircle::sync()
	{
	if (!m_renderer) {
	m_renderer = new SquircleRenderer;
	// Initializing resources is done before starting to encode render
	// commands, regardless of wanting an underlay or overlay.
	connect(window(), &QQuickWindow::beforeRendering, m_renderer, &SquircleRenderer::frameStart, Qt::DirectConnection);
	// Here we want an underlay and therefore connect to
	// beforeRenderPassRecording. Changing to afterRenderPassRecording
	// would render the squircle on top (overlay).
	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 Metal backend.
	Q_ASSERT(rif->graphicsApi() == QSGRendererInterface::MetalRhi);

	m_device = (id<MTLDevice>) rif->getResource(m_window, QSGRendererInterface::DeviceResource);
	Q_ASSERT(m_device);

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

	if (!m_initialized)
	init(m_window->graphicsStateInfo().framesInFlight);
	}

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

	const int UBUF_SIZE = 4;

	void SquircleRenderer::mainPassRecordingStart()
	{
	// This example demonstrates the simple case: prepending some commands to
	// the scenegraph's main renderpass. It does not create its own passes,
	// rendertargets, etc. so no synchronization is needed.

	const QQuickWindow::GraphicsStateInfo &stateInfo(m_window->graphicsStateInfo());

	QSGRendererInterface *rif = m_window->rendererInterface();
	id<MTLRenderCommandEncoder> encoder = (id<MTLRenderCommandEncoder>) rif->getResource(
	m_window, QSGRendererInterface::CommandEncoderResource);
	Q_ASSERT(encoder);

	m_window->beginExternalCommands();

	void *p = [m_ubuf[stateInfo.currentFrameSlot] contents];
	float t = m_t;
	memcpy(p, &t, 4);

	MTLViewport vp;
	vp.originX = 0;
	vp.originY = 0;
	vp.width = m_viewportSize.width();
	vp.height = m_viewportSize.height();
	vp.znear = 0;
	vp.zfar = 1;
	[encoder setViewport: vp];

	[encoder setFragmentBuffer: m_ubuf[stateInfo.currentFrameSlot] offset: 0 atIndex: 0];
	[encoder setVertexBuffer: m_vbuf offset: 0 atIndex: 1];
	[encoder setRenderPipelineState: m_pipeline];
	[encoder drawPrimitives: MTLPrimitiveTypeTriangleStrip vertexStart: 0 vertexCount: 4 instanceCount: 1 baseInstance: 0];

	m_window->endExternalCommands();
	}

	void SquircleRenderer::prepareShader(Stage stage)
	{
	QString filename;
	if (stage == VertexStage) {
	filename = QLatin1String(":/scenegraph/metalunderqml/squircle.vert");
	} else {
	Q_ASSERT(stage == FragmentStage);
	filename = QLatin1String(":/scenegraph/metalunderqml/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("main0");
	} else {
	m_frag = contents;
	Q_ASSERT(!m_frag.isEmpty());
	m_fragEntryPoint = QByteArrayLiteral("main0");
	}
	}

	SquircleRenderer::FuncAndLib SquircleRenderer::compileShaderFromSource(const QByteArray &src, const QByteArray &entryPoint)
	{
	FuncAndLib fl;

	NSString *srcstr = [NSString stringWithUTF8String: src.constData()];
	MTLCompileOptions *opts = [[MTLCompileOptions alloc] init];
	opts.languageVersion = MTLLanguageVersion1_2;
	NSError *err = nil;
	fl.second = [m_device newLibraryWithSource: srcstr options: opts error: &err];
	[opts release];
	// srcstr is autoreleased

	if (err) {
	const QString msg = QString::fromNSString(err.localizedDescription);
	qFatal("%s", qPrintable(msg));
	return fl;
	}

	NSString *name = [NSString stringWithUTF8String: entryPoint.constData()];
	fl.first = [fl.second newFunctionWithName: name];
	[name release];

	return fl;
	}

	void SquircleRenderer::init(int framesInFlight)
	{
	qDebug("init");

	Q_ASSERT(framesInFlight <= 3);
	m_initialized = true;

	m_vbuf = [m_device newBufferWithLength: sizeof(vertices) options: MTLResourceStorageModeShared];
	void *p = [m_vbuf contents];
	memcpy(p, vertices, sizeof(vertices));

	for (int i = 0; i < framesInFlight; ++i)
	m_ubuf[i] = [m_device newBufferWithLength: UBUF_SIZE options: MTLResourceStorageModeShared];

	MTLVertexDescriptor *inputLayout = [MTLVertexDescriptor vertexDescriptor];
	inputLayout.attributes[0].format = MTLVertexFormatFloat2;
	inputLayout.attributes[0].offset = 0;
	inputLayout.attributes[0].bufferIndex = 1; // ubuf is 0, vbuf is 1
	inputLayout.layouts[1].stride = 2 * sizeof(float);

	MTLRenderPipelineDescriptor *rpDesc = [[MTLRenderPipelineDescriptor alloc] init];
	rpDesc.vertexDescriptor = inputLayout;

	m_vs = compileShaderFromSource(m_vert, m_vertEntryPoint);
	rpDesc.vertexFunction = m_vs.first;
	m_fs = compileShaderFromSource(m_frag, m_fragEntryPoint);
	rpDesc.fragmentFunction = m_fs.first;

	rpDesc.colorAttachments[0].pixelFormat = MTLPixelFormatBGRA8Unorm;
	rpDesc.colorAttachments[0].blendingEnabled = true;
	rpDesc.colorAttachments[0].sourceRGBBlendFactor = MTLBlendFactorSourceAlpha;
	rpDesc.colorAttachments[0].sourceAlphaBlendFactor = MTLBlendFactorSourceAlpha;
	rpDesc.colorAttachments[0].destinationRGBBlendFactor = MTLBlendFactorOne;
	rpDesc.colorAttachments[0].destinationAlphaBlendFactor = MTLBlendFactorOne;

	if (m_device.depth24Stencil8PixelFormatSupported) {
	rpDesc.depthAttachmentPixelFormat = MTLPixelFormatDepth24Unorm_Stencil8;
	rpDesc.stencilAttachmentPixelFormat = MTLPixelFormatDepth24Unorm_Stencil8;
	} else {
	rpDesc.depthAttachmentPixelFormat = MTLPixelFormatDepth32Float_Stencil8;
	rpDesc.stencilAttachmentPixelFormat = MTLPixelFormatDepth32Float_Stencil8;
	}

	NSError *err = nil;
	m_pipeline = [m_device newRenderPipelineStateWithDescriptor: rpDesc error: &err];
	if (!m_pipeline) {
	const QString msg = QString::fromNSString(err.localizedDescription);
	qFatal("Failed to create render pipeline state: %s", qPrintable(msg));
	}
	[rpDesc release];
	}

	#include "metalsquircle.moc"