9452c963c8
Draws 1024 cubes at random x,y positions with varying color with a single instanced draw call. Change-Id: I8737503acf23866ad4734b1d88753415a3b93445 Reviewed-by: Lars Knoll <lars.knoll@qt.io>
176 lines
6.5 KiB
C++
176 lines
6.5 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2019 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** BSD License Usage
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** Alternatively, you may use this file under the terms of the BSD license
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** as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "../shared/examplefw.h"
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#include "../shared/cube.h"
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#include <QRandomGenerator>
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// Instanced draw example. When running with OpenGL, at least 3.3 or ES 3.0 is
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// needed.
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const int INSTANCE_COUNT = 1024;
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struct {
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QVector<QRhiResource *> releasePool;
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QRhiBuffer *vbuf = nullptr;
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QRhiBuffer *instBuf = nullptr;
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QRhiBuffer *ubuf = nullptr;
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QRhiShaderResourceBindings *srb = nullptr;
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QRhiGraphicsPipeline *ps = nullptr;
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QRhiResourceUpdateBatch *initialUpdates = nullptr;
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QMatrix4x4 winProj;
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} d;
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void Window::customInit()
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{
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if (!m_r->isFeatureSupported(QRhi::Instancing))
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qFatal("Instanced drawing is not supported");
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d.initialUpdates = m_r->nextResourceUpdateBatch();
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d.vbuf = m_r->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, sizeof(cube));
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d.vbuf->build();
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d.releasePool << d.vbuf;
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d.initialUpdates->uploadStaticBuffer(d.vbuf, cube);
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// translation + color (vec3 + vec3), interleaved, for each instance
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d.instBuf = m_r->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, INSTANCE_COUNT * 6 * sizeof(float));
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d.instBuf->build();
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d.releasePool << d.instBuf;
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d.ubuf = m_r->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, 64 + 12);
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d.ubuf->build();
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d.releasePool << d.ubuf;
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d.srb = m_r->newShaderResourceBindings();
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d.releasePool << d.srb;
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d.srb->setBindings({
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QRhiShaderResourceBinding::uniformBuffer(0, QRhiShaderResourceBinding::VertexStage, d.ubuf)
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});
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d.srb->build();
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d.ps = m_r->newGraphicsPipeline();
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d.releasePool << d.ps;
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d.ps->setShaderStages({
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{ QRhiShaderStage::Vertex, getShader(QLatin1String(":/inst.vert.qsb")) },
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{ QRhiShaderStage::Fragment, getShader(QLatin1String(":/inst.frag.qsb")) }
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});
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QRhiVertexInputLayout inputLayout;
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inputLayout.setBindings({
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{ 3 * sizeof(float) }, // cube vertices
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{ 6 * sizeof(float), QRhiVertexInputBinding::PerInstance } // per-instance translation and color
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});
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inputLayout.setAttributes({
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{ 0, 0, QRhiVertexInputAttribute::Float3, 0 }, // position
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{ 1, 1, QRhiVertexInputAttribute::Float3, 0 }, // instTranslate
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{ 1, 2, QRhiVertexInputAttribute::Float3, 3 * sizeof(float) } // instColor
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});
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d.ps->setVertexInputLayout(inputLayout);
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d.ps->setShaderResourceBindings(d.srb);
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d.ps->setRenderPassDescriptor(m_rp);
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d.ps->build();
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QByteArray instData;
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instData.resize(INSTANCE_COUNT * 6 * sizeof(float));
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float *p = reinterpret_cast<float *>(instData.data());
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QRandomGenerator *rgen = QRandomGenerator::global();
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for (int i = 0; i < INSTANCE_COUNT; ++i) {
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// translation
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*p++ = rgen->bounded(8000) / 100.0f - 40.0f;
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*p++ = rgen->bounded(8000) / 100.0f - 40.0f;
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*p++ = 0.0f;
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// color
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*p++ = i / float(INSTANCE_COUNT);
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*p++ = 0.0f;
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*p++ = 0.0f;
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}
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d.initialUpdates->uploadStaticBuffer(d.instBuf, instData.constData());
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}
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void Window::customRelease()
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{
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qDeleteAll(d.releasePool);
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d.releasePool.clear();
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}
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void Window::customRender()
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{
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const QSize outputSizeInPixels = m_sc->currentPixelSize();
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QRhiCommandBuffer *cb = m_sc->currentFrameCommandBuffer();
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QRhiResourceUpdateBatch *u = m_r->nextResourceUpdateBatch();
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if (d.initialUpdates) {
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u->merge(d.initialUpdates);
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d.initialUpdates->release();
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d.initialUpdates = nullptr;
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}
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if (d.winProj != m_proj) {
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d.winProj = m_proj;
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QMatrix4x4 mvp = m_proj;
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mvp.scale(0.05f);
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u->updateDynamicBuffer(d.ubuf, 0, 64, mvp.constData());
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}
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cb->beginPass(m_sc->currentFrameRenderTarget(), QColor::fromRgbF(0.4f, 0.7f, 0.0f, 1.0f), { 1.0f, 0 }, u);
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cb->setGraphicsPipeline(d.ps);
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cb->setViewport({ 0, 0, float(outputSizeInPixels.width()), float(outputSizeInPixels.height()) });
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cb->setShaderResources();
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const QRhiCommandBuffer::VertexInput vbufBinding[] = {
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{ d.vbuf, 0 },
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{ d.instBuf, 0 }
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};
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cb->setVertexInput(0, 2, vbufBinding);
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cb->draw(36, INSTANCE_COUNT);
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cb->endPass();
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}
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