467 lines
17 KiB
C++
467 lines
17 KiB
C++
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/****************************************************************************
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**
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** Copyright (C) 2020 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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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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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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// Demonstrates rendering to two cubemaps in two different ways:
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// - one by one, to each face,
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// - if the supported max number of color attachments is greater than 4: in
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// one go with all 6 faces attached as render targets.
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//
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// Finally, show what we got in a skybox-ish thing. Press the arrow keys to
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// switch between the two cubemaps. (the only difference should be their
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// background clear color)
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#define EXAMPLEFW_KEYPRESS_EVENTS
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#include "../shared/examplefw.h"
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#include "../shared/cube.h"
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// each face is 512x512
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static const QSize cubemapSize(512, 512);
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// each cubemap face gets a 256x256 quad in the center
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static float halfQuadVertexData[] =
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{ // Y up, CCW
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-0.5f, 0.5f,
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-0.5f, -0.5f,
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0.5f, -0.5f,
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0.5f, 0.5f,
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};
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static quint16 halfQuadIndexData[] =
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{
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0, 1, 2, 0, 2, 3
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};
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struct {
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QVector<QRhiResource *> releasePool;
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QRhiTexture *cubemap1 = nullptr;
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QRhiTexture *cubemap2 = nullptr;
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bool canDoMrt = false;
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QRhiBuffer *half_quad_vbuf = nullptr;
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QRhiBuffer *half_quad_ibuf = nullptr;
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QRhiBuffer *oneface_ubuf = nullptr;
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int ubufSizePerFace;
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QRhiTextureRenderTarget *oneface_rt[6];
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QRhiRenderPassDescriptor *oneface_rp = nullptr;
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QRhiShaderResourceBindings *oneface_srb = nullptr;
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QRhiGraphicsPipeline *oneface_ps = nullptr;
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QRhiBuffer *mrt_ubuf = nullptr;
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QRhiTextureRenderTarget *mrt_rt = nullptr;
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QRhiRenderPassDescriptor *mrt_rp = nullptr;
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QRhiShaderResourceBindings *mrt_srb = nullptr;
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QRhiGraphicsPipeline *mrt_ps = nullptr;
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QRhiBuffer *vbuf = nullptr;
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QRhiBuffer *ubuf = nullptr;
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QRhiSampler *sampler = 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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float rx = 0;
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} d;
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void initializePerFaceRendering(QRhi *rhi)
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{
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d.cubemap1 = rhi->newTexture(QRhiTexture::RGBA8, cubemapSize, 1, QRhiTexture::CubeMap | QRhiTexture::RenderTarget);
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d.cubemap1->build();
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d.releasePool << d.cubemap1;
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d.ubufSizePerFace = rhi->ubufAligned(64 + 12);
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d.oneface_ubuf = rhi->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, d.ubufSizePerFace * 6);
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d.oneface_ubuf->build();
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d.releasePool << d.oneface_ubuf;
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for (int face = 0; face < 6; ++face) {
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QRhiColorAttachment att(d.cubemap1);
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att.setLayer(face);
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QRhiTextureRenderTargetDescription rtDesc(att);
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d.oneface_rt[face] = rhi->newTextureRenderTarget(rtDesc);
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if (face == 0) {
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d.oneface_rp = d.oneface_rt[0]->newCompatibleRenderPassDescriptor();
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d.releasePool << d.oneface_rp;
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}
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d.oneface_rt[face]->setRenderPassDescriptor(d.oneface_rp);
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d.oneface_rt[face]->build();
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d.releasePool << d.oneface_rt[face];
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}
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d.oneface_srb = rhi->newShaderResourceBindings();
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const QRhiShaderResourceBinding::StageFlags visibility =
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QRhiShaderResourceBinding::VertexStage | QRhiShaderResourceBinding::FragmentStage;
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d.oneface_srb->setBindings({
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QRhiShaderResourceBinding::uniformBufferWithDynamicOffset(0, visibility, d.oneface_ubuf, 64 + 12)
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});
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d.oneface_srb->build();
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d.releasePool << d.oneface_srb;
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d.oneface_ps = rhi->newGraphicsPipeline();
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d.oneface_ps->setShaderStages({
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{ QRhiShaderStage::Vertex, getShader(QLatin1String(":/cubemap_oneface.vert.qsb")) },
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{ QRhiShaderStage::Fragment, getShader(QLatin1String(":/cubemap_oneface.frag.qsb")) }
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});
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QRhiVertexInputLayout inputLayout;
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inputLayout.setBindings({
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{ 2 * sizeof(float) }
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});
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inputLayout.setAttributes({
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{ 0, 0, QRhiVertexInputAttribute::Float2, 0 },
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});
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d.oneface_ps->setVertexInputLayout(inputLayout);
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d.oneface_ps->setShaderResourceBindings(d.oneface_srb);
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d.oneface_ps->setRenderPassDescriptor(d.oneface_rp);
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d.oneface_ps->build();
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d.releasePool << d.oneface_ps;
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// wasteful to duplicate the mvp as well but will do for now
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for (int face = 0; face < 6; ++face) {
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const int offset = d.ubufSizePerFace * face;
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QMatrix4x4 identity;
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d.initialUpdates->updateDynamicBuffer(d.oneface_ubuf, offset, 64, identity.constData());
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// will use a different color for each face
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QColor c;
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switch (face) {
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case 0:
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c = Qt::red;
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break;
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case 1:
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c = Qt::green;
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break;
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case 2:
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c = Qt::blue;
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break;
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case 3:
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c = Qt::yellow;
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break;
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case 4:
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c = Qt::lightGray;
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break;
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case 5:
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c = Qt::cyan;
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break;
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}
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float color[] = { float(c.redF()), float(c.greenF()), float(c.blueF()) };
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d.initialUpdates->updateDynamicBuffer(d.oneface_ubuf, offset + 64, 12, color);
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}
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}
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// 6 render passes, 1 draw call each, targeting one cubemap face at a time
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void renderPerFace(QRhiCommandBuffer *cb)
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{
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for (int face = 0; face < 6; ++face) {
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cb->beginPass(d.oneface_rt[face], Qt::black, { 1.0f, 0 });
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cb->setGraphicsPipeline(d.oneface_ps);
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cb->setViewport({ 0, 0,
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float(d.oneface_rt[face]->pixelSize().width()),
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float(d.oneface_rt[face]->pixelSize().height()) });
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const QRhiCommandBuffer::DynamicOffset dynamicOffset(0, face * d.ubufSizePerFace);
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cb->setShaderResources(nullptr, 1, &dynamicOffset);
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QRhiCommandBuffer::VertexInput vbufBinding(d.half_quad_vbuf, 0);
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cb->setVertexInput(0, 1, &vbufBinding, d.half_quad_ibuf, 0, QRhiCommandBuffer::IndexUInt16);
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cb->drawIndexed(6);
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cb->endPass();
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}
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}
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void initializeMrtRendering(QRhi *rhi)
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{
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d.cubemap2 = rhi->newTexture(QRhiTexture::RGBA8, cubemapSize, 1, QRhiTexture::CubeMap | QRhiTexture::RenderTarget);
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d.cubemap2->build();
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d.releasePool << d.cubemap2;
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d.mrt_ubuf = rhi->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, 64 + 6 * 16); // note that vec3 is aligned to 16 bytes
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d.mrt_ubuf->build();
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d.releasePool << d.mrt_ubuf;
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QVarLengthArray<QRhiColorAttachment, 6> attachments;
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for (int face = 0; face < 6; ++face) {
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QRhiColorAttachment att(d.cubemap2);
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att.setLayer(face);
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attachments.append(att);
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}
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QRhiTextureRenderTargetDescription rtDesc;
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rtDesc.setColorAttachments(attachments.cbegin(), attachments.cend());
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d.mrt_rt = rhi->newTextureRenderTarget(rtDesc);
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d.mrt_rp = d.mrt_rt->newCompatibleRenderPassDescriptor();
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d.releasePool << d.mrt_rp;
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d.mrt_rt->setRenderPassDescriptor(d.mrt_rp);
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d.mrt_rt->build();
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d.releasePool << d.mrt_rt;
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d.mrt_srb = rhi->newShaderResourceBindings();
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const QRhiShaderResourceBinding::StageFlags visibility =
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QRhiShaderResourceBinding::VertexStage | QRhiShaderResourceBinding::FragmentStage;
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d.mrt_srb->setBindings({
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QRhiShaderResourceBinding::uniformBuffer(0, visibility, d.mrt_ubuf)
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});
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d.mrt_srb->build();
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d.releasePool << d.mrt_srb;
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d.mrt_ps = rhi->newGraphicsPipeline();
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d.mrt_ps->setShaderStages({
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{ QRhiShaderStage::Vertex, getShader(QLatin1String(":/cubemap_mrt.vert.qsb")) },
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{ QRhiShaderStage::Fragment, getShader(QLatin1String(":/cubemap_mrt.frag.qsb")) }
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});
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QVarLengthArray<QRhiGraphicsPipeline::TargetBlend, 6> targetBlends;
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for (int face = 0; face < 6; ++face)
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targetBlends.append({}); // default to blend = false, color write = all, which is good
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d.mrt_ps->setTargetBlends(targetBlends.cbegin(), targetBlends.cend());
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QRhiVertexInputLayout inputLayout;
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inputLayout.setBindings({
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{ 2 * sizeof(float) }
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});
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inputLayout.setAttributes({
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{ 0, 0, QRhiVertexInputAttribute::Float2, 0 },
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});
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d.mrt_ps->setVertexInputLayout(inputLayout);
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d.mrt_ps->setShaderResourceBindings(d.mrt_srb);
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d.mrt_ps->setRenderPassDescriptor(d.mrt_rp);
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d.mrt_ps->build();
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d.releasePool << d.mrt_ps;
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QMatrix4x4 identity;
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d.initialUpdates->updateDynamicBuffer(d.mrt_ubuf, 0, 64, identity.constData());
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for (int face = 0; face < 6; ++face) {
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const int offset = 64 + face * 16;
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// will use a different color for each face
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QColor c;
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switch (face) {
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case 0:
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c = Qt::red;
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break;
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case 1:
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c = Qt::green;
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break;
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case 2:
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c = Qt::blue;
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break;
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case 3:
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c = Qt::yellow;
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break;
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case 4:
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c = Qt::lightGray;
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break;
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case 5:
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c = Qt::cyan;
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break;
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}
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float color[] = { float(c.redF()), float(c.greenF()), float(c.blueF()) };
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d.initialUpdates->updateDynamicBuffer(d.mrt_ubuf, offset, 12, color);
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}
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}
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// 1 render pass, 1 draw call, with all 6 faces attached and written to
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void renderWithMrt(QRhiCommandBuffer *cb)
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{
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// use a different clear color to differentiate from cubemap1 (because the
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// results are expected to be identical otherwise)
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cb->beginPass(d.mrt_rt, Qt::magenta, { 1.0f, 0 });
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cb->setGraphicsPipeline(d.mrt_ps);
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cb->setViewport({ 0, 0,
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float(d.mrt_rt->pixelSize().width()),
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float(d.mrt_rt->pixelSize().height()) });
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cb->setShaderResources();
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QRhiCommandBuffer::VertexInput vbufBinding(d.half_quad_vbuf, 0);
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cb->setVertexInput(0, 1, &vbufBinding, d.half_quad_ibuf, 0, QRhiCommandBuffer::IndexUInt16);
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cb->drawIndexed(6);
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cb->endPass();
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}
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void Window::customInit()
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{
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d.half_quad_vbuf = m_r->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, sizeof(halfQuadVertexData));
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d.half_quad_vbuf->build();
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d.releasePool << d.half_quad_vbuf;
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d.half_quad_ibuf = m_r->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::IndexBuffer, sizeof(halfQuadIndexData));
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d.half_quad_ibuf->build();
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d.releasePool << d.half_quad_ibuf;
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d.initialUpdates = m_r->nextResourceUpdateBatch();
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d.initialUpdates->uploadStaticBuffer(d.half_quad_vbuf, 0, sizeof(halfQuadVertexData), halfQuadVertexData);
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d.initialUpdates->uploadStaticBuffer(d.half_quad_ibuf, halfQuadIndexData);
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initializePerFaceRendering(m_r);
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d.canDoMrt = m_r->resourceLimit(QRhi::MaxColorAttachments) >= 6;
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if (d.canDoMrt)
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||
|
|
initializeMrtRendering(m_r);
|
||
|
|
else
|
||
|
|
qWarning("Not enough color attachments (need 6, supports %d)", m_r->resourceLimit(QRhi::MaxColorAttachments));
|
||
|
|
|
||
|
|
|
||
|
|
// onscreen stuff
|
||
|
|
d.vbuf = m_r->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, sizeof(cube));
|
||
|
|
d.vbuf->build();
|
||
|
|
d.releasePool << d.vbuf;
|
||
|
|
d.initialUpdates->uploadStaticBuffer(d.vbuf, cube);
|
||
|
|
|
||
|
|
d.ubuf = m_r->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, 64);
|
||
|
|
d.ubuf->build();
|
||
|
|
d.releasePool << d.ubuf;
|
||
|
|
|
||
|
|
d.sampler = m_r->newSampler(QRhiSampler::Linear, QRhiSampler::Linear, QRhiSampler::None,
|
||
|
|
QRhiSampler::Repeat, QRhiSampler::Repeat);
|
||
|
|
d.sampler->build();
|
||
|
|
d.releasePool << d.sampler;
|
||
|
|
|
||
|
|
d.srb = m_r->newShaderResourceBindings();
|
||
|
|
d.srb->setBindings({
|
||
|
|
QRhiShaderResourceBinding::uniformBuffer(0, QRhiShaderResourceBinding::VertexStage | QRhiShaderResourceBinding::FragmentStage, d.ubuf),
|
||
|
|
QRhiShaderResourceBinding::sampledTexture(1, QRhiShaderResourceBinding::FragmentStage, d.cubemap1, d.sampler)
|
||
|
|
});
|
||
|
|
d.srb->build();
|
||
|
|
d.releasePool << d.srb;
|
||
|
|
|
||
|
|
d.ps = m_r->newGraphicsPipeline();
|
||
|
|
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_sample.vert.qsb"));
|
||
|
|
Q_ASSERT(vs.isValid());
|
||
|
|
QShader fs = getShader(QLatin1String(":/cubemap_sample.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.releasePool << d.ps;
|
||
|
|
|
||
|
|
if (d.canDoMrt)
|
||
|
|
qDebug("Use the arrow keys to switch between the two generated cubemaps");
|
||
|
|
}
|
||
|
|
|
||
|
|
void Window::customRelease()
|
||
|
|
{
|
||
|
|
qDeleteAll(d.releasePool);
|
||
|
|
d.releasePool.clear();
|
||
|
|
}
|
||
|
|
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
|
||
|
|
QMatrix4x4 mvp = m_r->clipSpaceCorrMatrix();
|
||
|
|
mvp.perspective(90.0f, outputSizeInPixels.width() / (float) outputSizeInPixels.height(), 0.01f, 1000.0f);
|
||
|
|
mvp.scale(10);
|
||
|
|
mvp.rotate(d.rx, 1, 0, 0);
|
||
|
|
d.rx += 0.5f;
|
||
|
|
u->updateDynamicBuffer(d.ubuf, 0, 64, mvp.constData());
|
||
|
|
|
||
|
|
cb->resourceUpdate(u);
|
||
|
|
|
||
|
|
renderPerFace(cb);
|
||
|
|
|
||
|
|
if (d.canDoMrt)
|
||
|
|
renderWithMrt(cb);
|
||
|
|
|
||
|
|
cb->beginPass(m_sc->currentFrameRenderTarget(), m_clearColor, { 1.0f, 0 });
|
||
|
|
cb->setGraphicsPipeline(d.ps);
|
||
|
|
cb->setViewport(QRhiViewport(0, 0, outputSizeInPixels.width(), outputSizeInPixels.height()));
|
||
|
|
cb->setShaderResources();
|
||
|
|
const QRhiCommandBuffer::VertexInput vbufBinding(d.vbuf, 0);
|
||
|
|
cb->setVertexInput(0, 1, &vbufBinding);
|
||
|
|
cb->draw(36);
|
||
|
|
cb->endPass();
|
||
|
|
}
|
||
|
|
|
||
|
|
void Window::keyPressEvent(QKeyEvent *e)
|
||
|
|
{
|
||
|
|
switch (e->key()) {
|
||
|
|
case Qt::Key_Left:
|
||
|
|
case Qt::Key_Up:
|
||
|
|
qDebug("Showing first cubemap (generated by rendering to the faces one by one; black background)");
|
||
|
|
d.srb->setBindings({
|
||
|
|
QRhiShaderResourceBinding::uniformBuffer(0, QRhiShaderResourceBinding::VertexStage | QRhiShaderResourceBinding::FragmentStage, d.ubuf),
|
||
|
|
QRhiShaderResourceBinding::sampledTexture(1, QRhiShaderResourceBinding::FragmentStage, d.cubemap1, d.sampler)
|
||
|
|
});
|
||
|
|
d.srb->build();
|
||
|
|
break;
|
||
|
|
case Qt::Key_Right:
|
||
|
|
case Qt::Key_Down:
|
||
|
|
if (d.canDoMrt) {
|
||
|
|
qDebug("Showing second cubemap (generated with multiple render targets; magenta background)");
|
||
|
|
d.srb->setBindings({
|
||
|
|
QRhiShaderResourceBinding::uniformBuffer(0, QRhiShaderResourceBinding::VertexStage | QRhiShaderResourceBinding::FragmentStage, d.ubuf),
|
||
|
|
QRhiShaderResourceBinding::sampledTexture(1, QRhiShaderResourceBinding::FragmentStage, d.cubemap2, d.sampler)
|
||
|
|
});
|
||
|
|
d.srb->build();
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
e->ignore();
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|