qt 6.5.1 original

tests/manual/rhi/computeimage/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+#####################################################################
+## computeimage Binary:
+#####################################################################
+
+qt_internal_add_manual_test(computeimage
+    GUI
+    SOURCES
+        computeimage.cpp
+    LIBRARIES
+        Qt::Gui
+        Qt::GuiPrivate
+)
+
+# Resources:
+set_source_files_properties("../shared/qt256.png"
+    PROPERTIES QT_RESOURCE_ALIAS "qt256.png"
+)
+set_source_files_properties("../shared/texture.frag.qsb"
+    PROPERTIES QT_RESOURCE_ALIAS "texture.frag.qsb"
+)
+set_source_files_properties("../shared/texture.vert.qsb"
+    PROPERTIES QT_RESOURCE_ALIAS "texture.vert.qsb"
+)
+set(computeimage_resource_files
+    "../shared/qt256.png"
+    "../shared/texture.frag.qsb"
+    "../shared/texture.vert.qsb"
+    "image.comp.qsb"
+)
+
+qt_internal_add_resource(computeimage "computeimage"
+    PREFIX
+        "/"
+    FILES
+        ${computeimage_resource_files}
+)

tests/manual/rhi/computeimage/buildshaders.bat

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+qsb --glsl "310 es,430" --hlsl 50 --msl 12 image.comp -o image.comp.qsb

tests/manual/rhi/computeimage/computeimage.cpp

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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();
+}

tests/manual/rhi/computeimage/computeimage.pro

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+TEMPLATE = app
+
+QT += gui-private
+
+SOURCES = \
+    computeimage.cpp
+
+RESOURCES = computeimage.qrc

tests/manual/rhi/computeimage/computeimage.qrc

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+<!DOCTYPE RCC><RCC version="1.0">
+  <qresource>
+    <file>image.comp.qsb</file>
+    <file alias="texture.vert.qsb">../shared/texture.vert.qsb</file>
+    <file alias="texture.frag.qsb">../shared/texture.frag.qsb</file>
+    <file alias="qt256.png">../shared/qt256.png</file>
+</qresource>
+</RCC>

tests/manual/rhi/computeimage/image.comp

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+#version 440
+
+layout (local_size_x = 16, local_size_y = 16) in;
+
+layout(std140, binding = 0) uniform UniformBuffer
+{
+    float factor;
+} ubuf;
+
+layout (binding = 1, rgba8) uniform readonly image2D texIn;
+layout (binding = 2, rgba8) uniform writeonly image2D texOut;
+
+void main()
+{
+    ivec2 pos = ivec2(gl_GlobalInvocationID.xy);
+    ivec2 d = ivec2(1, 1);
+    vec4 diff = imageLoad(texIn, pos + d) - imageLoad(texIn, pos - d);
+    float c = (diff.x + diff.y + diff.z) / ubuf.factor + 0.5f;
+    imageStore(texOut, pos, vec4(c, c, c, 1.0));
+}