qt-everywhere-src-5.15.1/qtbase/tests/manual/rhi/cubemap_scissor/cubemap_scissor.cpp - orbit - Git at Google

 /****************************************************************************
 **
 ** Copyright (C) 2018 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the examples 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."
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 // This is a test for scissoring. Based on the cubemap test (because there the
 // rendering covers the entire viewport which is what we need here). The
 // scissor rectangle moves first up, then down, then from the center to the
 // left and then to right. The important part is to ensure that the behavior
 // identical between all backends, especially when the rectangle is partly or
 // fully off window.

 #include "../shared/examplefw.h"
 #include "../shared/cube.h"

 struct {
     QVector<QRhiResource *> releasePool;
     QRhiBuffer *vbuf = nullptr;
     QRhiBuffer *ubuf = nullptr;
     QRhiTexture *tex = nullptr;
     QRhiSampler *sampler = nullptr;
     QRhiShaderResourceBindings *srb = nullptr;
     QRhiGraphicsPipeline *ps = nullptr;
     QRhiResourceUpdateBatch *initialUpdates = nullptr;

     QPoint scissorBottomLeft;
     QSize scissorSize;
     int scissorAnimState = 0;
     QSize outputSize;
 } d;

 void Window::customInit()
 {
     d.vbuf = m_r->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, sizeof(cube));
     d.vbuf->build();
     d.releasePool << d.vbuf;

     d.ubuf = m_r->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, 64);
     d.ubuf->build();
     d.releasePool << d.ubuf;

     const QSize cubeMapSize(512, 512);
     d.tex = m_r->newTexture(QRhiTexture::RGBA8, cubeMapSize, 1, QRhiTexture::CubeMap);
     d.releasePool << d.tex;
     d.tex->build();

     d.initialUpdates = m_r->nextResourceUpdateBatch();
     d.initialUpdates->uploadStaticBuffer(d.vbuf, cube);

     QImage img = QImage(":/c.png").mirrored().convertToFormat(QImage::Format_RGBA8888);
     // just use the same image for all faces for now
     QRhiTextureSubresourceUploadDescription subresDesc(img);
     QRhiTextureUploadDescription desc({
                                           { 0, 0, subresDesc },  // +X
                                           { 1, 0, subresDesc },  // -X
                                           { 2, 0, subresDesc },  // +Y
                                           { 3, 0, subresDesc },  // -Y
                                           { 4, 0, subresDesc },  // +Z
                                           { 5, 0, subresDesc }   // -Z
                                       });
     d.initialUpdates->uploadTexture(d.tex, desc);

     d.sampler = m_r->newSampler(QRhiSampler::Linear, QRhiSampler::Linear, QRhiSampler::None,
                                 QRhiSampler::Repeat, QRhiSampler::Repeat);
     d.releasePool << d.sampler;
     d.sampler->build();

     d.srb = m_r->newShaderResourceBindings();
     d.releasePool << d.srb;
     d.srb->setBindings({
         QRhiShaderResourceBinding::uniformBuffer(0, QRhiShaderResourceBinding::VertexStage | QRhiShaderResourceBinding::FragmentStage, d.ubuf),
         QRhiShaderResourceBinding::sampledTexture(1, QRhiShaderResourceBinding::FragmentStage, d.tex, d.sampler)
     });
     d.srb->build();

     d.ps = m_r->newGraphicsPipeline();
     d.releasePool << d.ps;

     d.ps->setFlags(QRhiGraphicsPipeline::UsesScissor);

     d.ps->setDepthTest(true);
     d.ps->setDepthWrite(true);
     d.ps->setDepthOp(QRhiGraphicsPipeline::LessOrEqual);

     d.ps->setCullMode(QRhiGraphicsPipeline::Front); // we are inside the cube so cull front, not back
     d.ps->setFrontFace(QRhiGraphicsPipeline::CCW); // front is ccw in the cube data

     QShader vs = getShader(QLatin1String(":/cubemap.vert.qsb"));
     Q_ASSERT(vs.isValid());
     QShader fs = getShader(QLatin1String(":/cubemap.frag.qsb"));
     Q_ASSERT(fs.isValid());
     d.ps->setShaderStages({
         { QRhiShaderStage::Vertex, vs },
         { QRhiShaderStage::Fragment, fs }
     });

     QRhiVertexInputLayout inputLayout;
     inputLayout.setBindings({
         { 3 * sizeof(float) }
     });
     inputLayout.setAttributes({
         { 0, 0, QRhiVertexInputAttribute::Float3, 0 }
     });

     d.ps->setVertexInputLayout(inputLayout);
     d.ps->setShaderResourceBindings(d.srb);
     d.ps->setRenderPassDescriptor(m_rp);

     d.ps->build();

     d.scissorAnimState = 0;
 }

 void Window::customRelease()
 {
     qDeleteAll(d.releasePool);
     d.releasePool.clear();
 }

 static void advanceScissor()
 {
     switch (d.scissorAnimState) {
     case 1: // up
         d.scissorBottomLeft.setX(d.outputSize.width() / 4);
         d.scissorBottomLeft.ry() += 1;
         if (d.scissorBottomLeft.y() > d.outputSize.height() + 100)
             d.scissorAnimState = 2;
         break;
     case 2: // down
         d.scissorBottomLeft.ry() -= 1;
         if (d.scissorBottomLeft.y() < -d.scissorSize.height() - 100)
             d.scissorAnimState = 3;
         break;
     case 3: // left
         d.scissorBottomLeft.setY(d.outputSize.height() / 4);
         d.scissorBottomLeft.rx() += 1;
         if (d.scissorBottomLeft.x() > d.outputSize.width() + 100)
             d.scissorAnimState = 4;
         break;
     case 4: // right
         d.scissorBottomLeft.rx() -= 1;
         if (d.scissorBottomLeft.x() < -d.scissorSize.width() - 100)
             d.scissorAnimState = 1;
         break;
     }

     qDebug() << "scissor bottom-left" << d.scissorBottomLeft << "size" << d.scissorSize;
 }

 void Window::customRender()
 {
     const QSize outputSizeInPixels = m_sc->currentPixelSize();
     QRhiCommandBuffer *cb = m_sc->currentFrameCommandBuffer();
     QRhiResourceUpdateBatch *u = m_r->nextResourceUpdateBatch();

     if (d.initialUpdates) {
         u->merge(d.initialUpdates);
         d.initialUpdates->release();
         d.initialUpdates = nullptr;
     }

     d.outputSize = outputSizeInPixels;
     if (d.scissorAnimState == 0) {
         d.scissorBottomLeft = QPoint(outputSizeInPixels.width() / 4, 0);
         d.scissorSize = QSize(outputSizeInPixels.width() / 2, outputSizeInPixels.height() / 2);
         d.scissorAnimState = 1;
     }

     QMatrix4x4 mvp = m_r->clipSpaceCorrMatrix();
     mvp.perspective(90.0f, outputSizeInPixels.width() / (float) outputSizeInPixels.height(), 0.01f, 1000.0f);
     // cube vertices go from -1..1
     mvp.scale(10);
     static float rx = 0;
     mvp.rotate(rx, 1, 0, 0);
     rx += 0.5f;
     // no translation
     u->updateDynamicBuffer(d.ubuf, 0, 64, mvp.constData());

     cb->beginPass(m_sc->currentFrameRenderTarget(), m_clearColor, { 1.0f, 0 }, u);
     cb->setGraphicsPipeline(d.ps);
     cb->setViewport(QRhiViewport(0, 0, outputSizeInPixels.width(), outputSizeInPixels.height()));

     // Apply a scissor rectangle that moves around on the screen, also
     // exercising the out of screen (negative x or y) case.
     cb->setScissor(QRhiScissor(d.scissorBottomLeft.x(), d.scissorBottomLeft.y(),
                                d.scissorSize.width(), d.scissorSize.height()));

     cb->setShaderResources();

     const QRhiCommandBuffer::VertexInput vbufBinding(d.vbuf, 0);
     cb->setVertexInput(0, 1, &vbufBinding);
     cb->draw(36);
     cb->endPass();

     advanceScissor();
 }
	/****************************************************************************
	**
	** Copyright (C) 2018 The Qt Company Ltd.
	** Contact: https://www.qt.io/licensing/
	**
	** This file is part of the examples 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."
	**
	** $QT_END_LICENSE$
	**
	****************************************************************************/

	// This is a test for scissoring. Based on the cubemap test (because there the
	// rendering covers the entire viewport which is what we need here). The
	// scissor rectangle moves first up, then down, then from the center to the
	// left and then to right. The important part is to ensure that the behavior
	// identical between all backends, especially when the rectangle is partly or
	// fully off window.

	#include "../shared/examplefw.h"
	#include "../shared/cube.h"

	struct {
	QVector<QRhiResource *> releasePool;
	QRhiBuffer *vbuf = nullptr;
	QRhiBuffer *ubuf = nullptr;
	QRhiTexture *tex = nullptr;
	QRhiSampler *sampler = nullptr;
	QRhiShaderResourceBindings *srb = nullptr;
	QRhiGraphicsPipeline *ps = nullptr;
	QRhiResourceUpdateBatch *initialUpdates = nullptr;

	QPoint scissorBottomLeft;
	QSize scissorSize;
	int scissorAnimState = 0;
	QSize outputSize;
	} d;

	void Window::customInit()
	{
	d.vbuf = m_r->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, sizeof(cube));
	d.vbuf->build();
	d.releasePool << d.vbuf;

	d.ubuf = m_r->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, 64);
	d.ubuf->build();
	d.releasePool << d.ubuf;

	const QSize cubeMapSize(512, 512);
	d.tex = m_r->newTexture(QRhiTexture::RGBA8, cubeMapSize, 1, QRhiTexture::CubeMap);
	d.releasePool << d.tex;
	d.tex->build();

	d.initialUpdates = m_r->nextResourceUpdateBatch();
	d.initialUpdates->uploadStaticBuffer(d.vbuf, cube);

	QImage img = QImage(":/c.png").mirrored().convertToFormat(QImage::Format_RGBA8888);
	// just use the same image for all faces for now
	QRhiTextureSubresourceUploadDescription subresDesc(img);
	QRhiTextureUploadDescription desc({
	{ 0, 0, subresDesc }, // +X
	{ 1, 0, subresDesc }, // -X
	{ 2, 0, subresDesc }, // +Y
	{ 3, 0, subresDesc }, // -Y
	{ 4, 0, subresDesc }, // +Z
	{ 5, 0, subresDesc } // -Z
	});
	d.initialUpdates->uploadTexture(d.tex, desc);

	d.sampler = m_r->newSampler(QRhiSampler::Linear, QRhiSampler::Linear, QRhiSampler::None,
	QRhiSampler::Repeat, QRhiSampler::Repeat);
	d.releasePool << d.sampler;
	d.sampler->build();

	d.srb = m_r->newShaderResourceBindings();
	d.releasePool << d.srb;
	d.srb->setBindings({
	QRhiShaderResourceBinding::uniformBuffer(0, QRhiShaderResourceBinding::VertexStage \| QRhiShaderResourceBinding::FragmentStage, d.ubuf),
	QRhiShaderResourceBinding::sampledTexture(1, QRhiShaderResourceBinding::FragmentStage, d.tex, d.sampler)
	});
	d.srb->build();

	d.ps = m_r->newGraphicsPipeline();
	d.releasePool << d.ps;

	d.ps->setFlags(QRhiGraphicsPipeline::UsesScissor);

	d.ps->setDepthTest(true);
	d.ps->setDepthWrite(true);
	d.ps->setDepthOp(QRhiGraphicsPipeline::LessOrEqual);

	d.ps->setCullMode(QRhiGraphicsPipeline::Front); // we are inside the cube so cull front, not back
	d.ps->setFrontFace(QRhiGraphicsPipeline::CCW); // front is ccw in the cube data

	QShader vs = getShader(QLatin1String(":/cubemap.vert.qsb"));
	Q_ASSERT(vs.isValid());
	QShader fs = getShader(QLatin1String(":/cubemap.frag.qsb"));
	Q_ASSERT(fs.isValid());
	d.ps->setShaderStages({
	{ QRhiShaderStage::Vertex, vs },
	{ QRhiShaderStage::Fragment, fs }
	});

	QRhiVertexInputLayout inputLayout;
	inputLayout.setBindings({
	{ 3 * sizeof(float) }
	});
	inputLayout.setAttributes({
	{ 0, 0, QRhiVertexInputAttribute::Float3, 0 }
	});

	d.ps->setVertexInputLayout(inputLayout);
	d.ps->setShaderResourceBindings(d.srb);
	d.ps->setRenderPassDescriptor(m_rp);

	d.ps->build();

	d.scissorAnimState = 0;
	}

	void Window::customRelease()
	{
	qDeleteAll(d.releasePool);
	d.releasePool.clear();
	}

	static void advanceScissor()
	{
	switch (d.scissorAnimState) {
	case 1: // up
	d.scissorBottomLeft.setX(d.outputSize.width() / 4);
	d.scissorBottomLeft.ry() += 1;
	if (d.scissorBottomLeft.y() > d.outputSize.height() + 100)
	d.scissorAnimState = 2;
	break;
	case 2: // down
	d.scissorBottomLeft.ry() -= 1;
	if (d.scissorBottomLeft.y() < -d.scissorSize.height() - 100)
	d.scissorAnimState = 3;
	break;
	case 3: // left
	d.scissorBottomLeft.setY(d.outputSize.height() / 4);
	d.scissorBottomLeft.rx() += 1;
	if (d.scissorBottomLeft.x() > d.outputSize.width() + 100)
	d.scissorAnimState = 4;
	break;
	case 4: // right
	d.scissorBottomLeft.rx() -= 1;
	if (d.scissorBottomLeft.x() < -d.scissorSize.width() - 100)
	d.scissorAnimState = 1;
	break;
	}

	qDebug() << "scissor bottom-left" << d.scissorBottomLeft << "size" << d.scissorSize;
	}

	void Window::customRender()
	{
	const QSize outputSizeInPixels = m_sc->currentPixelSize();
	QRhiCommandBuffer *cb = m_sc->currentFrameCommandBuffer();
	QRhiResourceUpdateBatch *u = m_r->nextResourceUpdateBatch();

	if (d.initialUpdates) {
	u->merge(d.initialUpdates);
	d.initialUpdates->release();
	d.initialUpdates = nullptr;
	}

	d.outputSize = outputSizeInPixels;
	if (d.scissorAnimState == 0) {
	d.scissorBottomLeft = QPoint(outputSizeInPixels.width() / 4, 0);
	d.scissorSize = QSize(outputSizeInPixels.width() / 2, outputSizeInPixels.height() / 2);
	d.scissorAnimState = 1;
	}

	QMatrix4x4 mvp = m_r->clipSpaceCorrMatrix();
	mvp.perspective(90.0f, outputSizeInPixels.width() / (float) outputSizeInPixels.height(), 0.01f, 1000.0f);
	// cube vertices go from -1..1
	mvp.scale(10);
	static float rx = 0;
	mvp.rotate(rx, 1, 0, 0);
	rx += 0.5f;
	// no translation
	u->updateDynamicBuffer(d.ubuf, 0, 64, mvp.constData());

	cb->beginPass(m_sc->currentFrameRenderTarget(), m_clearColor, { 1.0f, 0 }, u);
	cb->setGraphicsPipeline(d.ps);
	cb->setViewport(QRhiViewport(0, 0, outputSizeInPixels.width(), outputSizeInPixels.height()));

	// Apply a scissor rectangle that moves around on the screen, also
	// exercising the out of screen (negative x or y) case.
	cb->setScissor(QRhiScissor(d.scissorBottomLeft.x(), d.scissorBottomLeft.y(),
	d.scissorSize.width(), d.scissorSize.height()));

	cb->setShaderResources();

	const QRhiCommandBuffer::VertexInput vbufBinding(d.vbuf, 0);
	cb->setVertexInput(0, 1, &vbufBinding);
	cb->draw(36);
	cb->endPass();

	advanceScissor();
	}