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// Copyright (C) 2019 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "../shared/examplefw.h"
// Compute shader example with image load/store. The texture sampled in the
// fragment shader is generated by the compute shader.
struct {
QList<QRhiResource *> releasePool;
QRhiTexture *texIn = nullptr;
QRhiTexture *texOut = nullptr;
QRhiBuffer *computeUBuf = nullptr;
QRhiShaderResourceBindings *computeBindings = nullptr;
QRhiComputePipeline *computePipeline = nullptr;
QRhiBuffer *vbuf = nullptr;
QRhiBuffer *ibuf = nullptr;
QRhiBuffer *ubuf = nullptr;
QRhiSampler *sampler = nullptr;
QRhiShaderResourceBindings *srb = nullptr;
QRhiGraphicsPipeline *ps = nullptr;
QRhiResourceUpdateBatch *initialUpdates = nullptr;
QSize imageSize;
QMatrix4x4 winProj;
float factor = 1.0f;
} d;
static float quadVertexData[] =
{ // Y up, CCW
-0.5f, 0.5f, 0.0f, 0.0f,
-0.5f, -0.5f, 0.0f, 1.0f,
0.5f, -0.5f, 1.0f, 1.0f,
0.5f, 0.5f, 1.0f, 0.0f
};
static quint16 quadIndexData[] =
{
0, 1, 2, 0, 2, 3
};
void Window::customInit()
{
if (!m_r->isFeatureSupported(QRhi::Compute))
qFatal("Compute is not supported");
d.initialUpdates = m_r->nextResourceUpdateBatch();
// compute pass
const QImage image = QImage(QLatin1String(":/qt256.png")).convertToFormat(QImage::Format_RGBA8888);
d.imageSize = image.size();
d.texIn = m_r->newTexture(QRhiTexture::RGBA8, d.imageSize, 1, QRhiTexture::UsedWithLoadStore);
d.texIn->create();
d.releasePool << d.texIn;
d.texOut = m_r->newTexture(QRhiTexture::RGBA8, d.imageSize, 1, QRhiTexture::UsedWithLoadStore);
d.texOut->create();
d.releasePool << d.texOut;
d.initialUpdates->uploadTexture(d.texIn, image);
d.computeUBuf = m_r->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, 4);
d.computeUBuf->create();
d.releasePool << d.computeUBuf;
d.computeBindings = m_r->newShaderResourceBindings();
d.computeBindings->setBindings({
QRhiShaderResourceBinding::uniformBuffer(0, QRhiShaderResourceBinding::ComputeStage, d.computeUBuf),
QRhiShaderResourceBinding::imageLoad(1, QRhiShaderResourceBinding::ComputeStage, d.texIn, 0),
QRhiShaderResourceBinding::imageStore(2, QRhiShaderResourceBinding::ComputeStage, d.texOut, 0)
});
d.computeBindings->create();
d.releasePool << d.computeBindings;
d.computePipeline = m_r->newComputePipeline();
d.computePipeline->setShaderResourceBindings(d.computeBindings);
d.computePipeline->setShaderStage({ QRhiShaderStage::Compute, getShader(QLatin1String(":/image.comp.qsb")) });
d.computePipeline->create();
d.releasePool << d.computePipeline;
// graphics pass
d.vbuf = m_r->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, sizeof(quadVertexData));
d.vbuf->create();
d.releasePool << d.vbuf;
d.initialUpdates->uploadStaticBuffer(d.vbuf, quadVertexData);
d.ibuf = m_r->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::IndexBuffer, sizeof(quadIndexData));
d.ibuf->create();
d.releasePool << d.ibuf;
d.initialUpdates->uploadStaticBuffer(d.ibuf, quadIndexData);
d.ubuf = m_r->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, 68);
d.ubuf->create();
d.releasePool << d.ubuf;
qint32 flip = 0; // regardless of isYUpInFramebuffer() since the input is not flipped so the end result is good for GL too
d.initialUpdates->updateDynamicBuffer(d.ubuf, 64, 4, &flip);
d.sampler = m_r->newSampler(QRhiSampler::Linear, QRhiSampler::Linear, QRhiSampler::None,
QRhiSampler::ClampToEdge, QRhiSampler::ClampToEdge);
d.releasePool << d.sampler;
d.sampler->create();
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.texOut, d.sampler)
});
d.srb->create();
d.ps = m_r->newGraphicsPipeline();
d.releasePool << d.ps;
d.ps->setShaderStages({
{ QRhiShaderStage::Vertex, getShader(QLatin1String(":/texture.vert.qsb")) },
{ QRhiShaderStage::Fragment, getShader(QLatin1String(":/texture.frag.qsb")) }
});
QRhiVertexInputLayout inputLayout;
inputLayout.setBindings({
{ 4 * sizeof(float) }
});
inputLayout.setAttributes({
{ 0, 0, QRhiVertexInputAttribute::Float2, 0 },
{ 0, 1, QRhiVertexInputAttribute::Float2, 2 * sizeof(float) }
});
d.ps->setVertexInputLayout(inputLayout);
d.ps->setShaderResourceBindings(d.srb);
d.ps->setRenderPassDescriptor(m_rp);
d.ps->create();
}
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;
}
if (d.winProj != m_proj) {
d.winProj = m_proj;
QMatrix4x4 mvp = m_proj;
mvp.scale(2.5f);
u->updateDynamicBuffer(d.ubuf, 0, 64, mvp.constData());
}
u->updateDynamicBuffer(d.computeUBuf, 0, 4, &d.factor);
d.factor += 0.1f;
if (d.factor >= 50.0f)
d.factor = 1.0f;
cb->beginComputePass(u);
cb->setComputePipeline(d.computePipeline);
cb->setShaderResources();
cb->dispatch(d.imageSize.width() / 16, d.imageSize.height() / 16, 1);
cb->endComputePass();
cb->beginPass(m_sc->currentFrameRenderTarget(), m_clearColor, { 1.0f, 0 });
cb->setGraphicsPipeline(d.ps);
cb->setViewport({ 0, 0, float(outputSizeInPixels.width()), float(outputSizeInPixels.height()) });
cb->setShaderResources();
QRhiCommandBuffer::VertexInput vbufBinding(d.vbuf, 0);
cb->setVertexInput(0, 1, &vbufBinding, d.ibuf, 0, QRhiCommandBuffer::IndexUInt16);
cb->drawIndexed(6);
cb->endPass();
}
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