22d22eb282
This will also cause clearing to 0,0,0,0. Essential in order to allow fast testing of window transparency issues in combination with QRhi and the various backends. Change-Id: Iee2763c1d06f1d3e5d59a9142abaf30fab1dc543 Reviewed-by: Christian Strømme <christian.stromme@qt.io>
260 lines
9.7 KiB
C++
260 lines
9.7 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2018 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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** 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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// Uses a multisample renderbuffer (whatever that may be on a given backend) to
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// render to and then resolves the samples into a non-multisample texture.
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static float vertexData[] =
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{ // Y up, CCW
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-0.5f, 0.5f, 0.0f, 0.0f,
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-0.5f, -0.5f, 0.0f, 1.0f,
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0.5f, -0.5f, 1.0f, 1.0f,
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0.5f, 0.5f, 1.0f, 0.0f
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};
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static quint16 indexData[] =
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{
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0, 1, 2, 0, 2, 3
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};
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static float triangleData[] =
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{ // Y up, CCW
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0.0f, 0.5f, 1.0f, 0.0f, 0.0f,
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-0.5f, -0.5f, 0.0f, 1.0f, 0.0f,
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0.5f, -0.5f, 0.0f, 0.0f, 1.0f,
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};
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struct {
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QVector<QRhiResource *> releasePool;
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QRhiBuffer *vbuf = nullptr;
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QRhiBuffer *ibuf = nullptr;
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QRhiBuffer *ubuf = nullptr;
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QRhiRenderBuffer *rb = nullptr;
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QRhiTextureRenderTarget *rt = nullptr;
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QRhiRenderPassDescriptor *rtRp = nullptr;
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QRhiTexture *tex = nullptr;
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QRhiSampler *sampler = nullptr;
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QRhiBuffer *triUbuf = nullptr;
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QRhiShaderResourceBindings *triSrb = nullptr;
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QRhiGraphicsPipeline *triPs = 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 triBaseMvp;
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float triRot = 0;
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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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d.vbuf = m_r->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, sizeof(vertexData) + sizeof(triangleData));
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d.vbuf->build();
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d.releasePool << d.vbuf;
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d.ibuf = m_r->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::IndexBuffer, sizeof(indexData));
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d.ibuf->build();
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d.releasePool << d.ibuf;
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d.ubuf = m_r->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, 68);
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d.ubuf->build();
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d.releasePool << d.ubuf;
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d.rb = m_r->newRenderBuffer(QRhiRenderBuffer::Color, QSize(512, 512), 4); // 4x MSAA
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d.rb->build();
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d.releasePool << d.rb;
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// the non-msaa texture that will be the destination in the resolve
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d.tex = m_r->newTexture(QRhiTexture::RGBA8, d.rb->pixelSize(), 1, QRhiTexture::RenderTarget);
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d.releasePool << d.tex;
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d.tex->build();
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// rb is multisample, instead of writing out the msaa data into it,
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// resolve into d.tex at the end of each render pass
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QRhiTextureRenderTargetDescription rtDesc;
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QRhiColorAttachment rtAtt(d.rb);
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rtAtt.setResolveTexture(d.tex);
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rtDesc.setColorAttachments({ rtAtt });
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d.rt = m_r->newTextureRenderTarget(rtDesc);
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d.releasePool << d.rt;
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d.rtRp = d.rt->newCompatibleRenderPassDescriptor();
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d.releasePool << d.rtRp;
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d.rt->setRenderPassDescriptor(d.rtRp);
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d.rt->build();
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d.triUbuf = m_r->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, 68);
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d.releasePool << d.triUbuf;
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d.triUbuf->build();
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d.triSrb = m_r->newShaderResourceBindings();
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d.releasePool << d.triSrb;
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d.triSrb->setBindings({
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QRhiShaderResourceBinding::uniformBuffer(0, QRhiShaderResourceBinding::VertexStage | QRhiShaderResourceBinding::FragmentStage, d.triUbuf)
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});
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d.triSrb->build();
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d.triPs = m_r->newGraphicsPipeline();
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d.releasePool << d.triPs;
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d.triPs->setSampleCount(4); // must match the render target
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d.triPs->setShaderStages({
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{ QRhiShaderStage::Vertex, getShader(QLatin1String(":/color.vert.qsb")) },
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{ QRhiShaderStage::Fragment, getShader(QLatin1String(":/color.frag.qsb")) }
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});
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QRhiVertexInputLayout inputLayout;
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inputLayout.setBindings({
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{ 5 * 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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{ 0, 1, QRhiVertexInputAttribute::Float3, 2 * sizeof(float) }
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});
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d.triPs->setVertexInputLayout(inputLayout);
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d.triPs->setShaderResourceBindings(d.triSrb);
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d.triPs->setRenderPassDescriptor(d.rtRp);
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d.triPs->build();
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d.sampler = m_r->newSampler(QRhiSampler::Linear, QRhiSampler::Linear, QRhiSampler::None,
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QRhiSampler::ClampToEdge, QRhiSampler::ClampToEdge);
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d.releasePool << d.sampler;
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d.sampler->build();
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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 | QRhiShaderResourceBinding::FragmentStage, d.ubuf),
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QRhiShaderResourceBinding::sampledTexture(1, QRhiShaderResourceBinding::FragmentStage, d.tex, d.sampler)
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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(":/texture.vert.qsb")) },
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{ QRhiShaderStage::Fragment, getShader(QLatin1String(":/texture.frag.qsb")) }
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});
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inputLayout.setBindings({
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{ 4 * 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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{ 0, 1, QRhiVertexInputAttribute::Float2, 2 * sizeof(float) }
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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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d.initialUpdates = m_r->nextResourceUpdateBatch();
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d.initialUpdates->uploadStaticBuffer(d.vbuf, 0, sizeof(vertexData), vertexData);
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d.initialUpdates->uploadStaticBuffer(d.vbuf, sizeof(vertexData), sizeof(triangleData), triangleData);
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d.initialUpdates->uploadStaticBuffer(d.ibuf, indexData);
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d.triBaseMvp = m_r->clipSpaceCorrMatrix();
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d.triBaseMvp.perspective(45.0f, d.rb->pixelSize().width() / float(d.rb->pixelSize().height()), 0.01f, 1000.0f);
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d.triBaseMvp.translate(0, 0, -2);
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float opacity = 1.0f;
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d.initialUpdates->updateDynamicBuffer(d.triUbuf, 64, 4, &opacity);
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qint32 flip = m_r->isYUpInFramebuffer() ? 1 : 0;
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d.initialUpdates->updateDynamicBuffer(d.ubuf, 64, 4, &flip);
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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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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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QMatrix4x4 triMvp = d.triBaseMvp;
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triMvp.rotate(d.triRot, 0, 1, 0);
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d.triRot += 1;
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u->updateDynamicBuffer(d.triUbuf, 0, 64, triMvp.constData());
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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(2.5f);
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u->updateDynamicBuffer(d.ubuf, 0, 64, mvp.constData());
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}
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// offscreen (triangle, msaa)
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cb->beginPass(d.rt, QColor::fromRgbF(0.5f, 0.2f, 0.0f, 1.0f), { 1.0f, 0 }, u);
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cb->setGraphicsPipeline(d.triPs);
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cb->setViewport({ 0, 0, float(d.rb->pixelSize().width()), float(d.rb->pixelSize().height()) });
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cb->setShaderResources();
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QRhiCommandBuffer::VertexInput vbufBinding(d.vbuf, sizeof(vertexData));
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cb->setVertexInput(0, 1, &vbufBinding);
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cb->draw(3);
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cb->endPass();
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// onscreen (quad)
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const QSize outputSizeInPixels = m_sc->currentPixelSize();
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cb->beginPass(m_sc->currentFrameRenderTarget(), m_clearColor, { 1.0f, 0 });
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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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vbufBinding.second = 0;
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cb->setVertexInput(0, 1, &vbufBinding, d.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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