qt 6.5.1 original

tests/manual/rhi/computebuffer/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+#####################################################################
+## computebuffer Binary:
+#####################################################################
+
+qt_internal_add_manual_test(computebuffer
+    GUI
+    SOURCES
+        computebuffer.cpp
+    LIBRARIES
+        Qt::Gui
+        Qt::GuiPrivate
+)
+
+# Resources:
+set(computebuffer_resource_files
+    "buffer.comp.qsb"
+    "main.frag.qsb"
+    "main.vert.qsb"
+)
+
+qt_internal_add_resource(computebuffer "computebuffer"
+    PREFIX
+        "/"
+    FILES
+        ${computebuffer_resource_files}
+)
+
+
+# TEMPLATE = "app"

tests/manual/rhi/computebuffer/buffer.comp

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+#version 440
+
+layout (local_size_x = 256) in;
+
+struct Data
+{
+    vec2 pos;
+    float dir;
+};
+
+layout(std140, binding = 0) buffer StorageBuffer
+{
+    Data d[];
+} buf;
+
+layout(std140, binding = 1) uniform UniformBuffer
+{
+    float step;
+    uint count;
+} ubuf;
+
+void main()
+{
+    uint index = gl_GlobalInvocationID.x;
+    if (index < ubuf.count) {
+        vec2 p = buf.d[index].pos;
+        float dir = buf.d[index].dir;
+
+        p.x += dir * ubuf.step * 0.01;
+        if (p.x > 1.0) {
+            p.x = 1.0;
+            buf.d[index].dir *= -1.0;
+        }
+        if (p.x < -1.0) {
+            p.x = -1.0;
+            buf.d[index].dir *= -1.0;
+        }
+
+        buf.d[index].pos = p;
+    }
+}

tests/manual/rhi/computebuffer/buildshaders.bat

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+qsb --glsl "310 es,430" --hlsl 50 --msl 12 buffer.comp -o buffer.comp.qsb
+qsb --glsl "310 es,430" --hlsl 50 --msl 12 main.vert -o main.vert.qsb
+qsb --glsl "310 es,430" --hlsl 50 --msl 12 main.frag -o main.frag.qsb

tests/manual/rhi/computebuffer/computebuffer.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"
+#include <QRandomGenerator>
+
+// Compute shader example. Writes to a storage buffer from a compute shader,
+// then uses the same buffer as vertex buffer in the vertex stage. This would
+// be typical when implementing particles for example. Here we just simply move
+// the positions back and forth along the X axis.
+
+// Note that the example relies on gl_PointSize which is not supported
+// everywhere. So in some cases the points will be of size 1.
+
+struct {
+    QList<QRhiResource *> releasePool;
+    QRhiBuffer *sbuf = nullptr;
+    QRhiBuffer *computeUniBuf = nullptr;
+    QRhiShaderResourceBindings *computeBindings = nullptr;
+    QRhiComputePipeline *computePipeline = nullptr;
+    QRhiShaderResourceBindings *graphicsBindings = nullptr;
+    QRhiGraphicsPipeline *graphicsPipeline = nullptr;
+    QRhiResourceUpdateBatch *initialUpdates = nullptr;
+    float step = 0.2f;
+} d;
+
+// these struct must match the std140 packing rules
+struct Data {
+    float pos[2];
+    float dir;
+    quint32 pad[1];
+};
+struct ComputeUBuf {
+    float step;
+    quint32 count;
+};
+
+const int DATA_COUNT = 256 * 128;
+
+const int COMPUTE_UBUF_SIZE = 8;
+
+void Window::customInit()
+{
+    if (!m_r->isFeatureSupported(QRhi::Compute))
+        qFatal("Compute is not supported");
+
+    if (!m_r->isFeatureSupported(QRhi::VertexShaderPointSize))
+        qWarning("Point sizes other than 1 not supported");
+
+    // compute pass
+
+    d.sbuf = m_r->newBuffer(QRhiBuffer::Immutable,
+                            QRhiBuffer::StorageBuffer | QRhiBuffer::VertexBuffer,
+                            sizeof(Data) * DATA_COUNT);
+    d.sbuf->create();
+    d.releasePool << d.sbuf;
+
+    d.computeUniBuf = m_r->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, COMPUTE_UBUF_SIZE);
+    d.computeUniBuf->create();
+    d.releasePool << d.computeUniBuf;
+
+    d.initialUpdates = m_r->nextResourceUpdateBatch();
+
+    QByteArray data;
+    data.resize(sizeof(Data) * DATA_COUNT);
+    Data *p = reinterpret_cast<Data *>(data.data());
+    QRandomGenerator *rgen = QRandomGenerator::global();
+    for (int i = 0; i < DATA_COUNT; ++i) {
+        p->pos[0] = rgen->bounded(1000) / 500.0f - 1.0f;
+        p->pos[1] = rgen->bounded(1000) / 500.0f - 1.0f;
+        p->dir = rgen->bounded(2) ? 1 : -1;
+        ++p;
+    }
+    d.initialUpdates->uploadStaticBuffer(d.sbuf, data.constData());
+
+    ComputeUBuf ud;
+    ud.step = d.step;
+    ud.count = DATA_COUNT;
+    d.initialUpdates->updateDynamicBuffer(d.computeUniBuf, 0, COMPUTE_UBUF_SIZE, &ud);
+
+    d.computeBindings = m_r->newShaderResourceBindings();
+    d.computeBindings->setBindings({
+                                       QRhiShaderResourceBinding::bufferLoadStore(0, QRhiShaderResourceBinding::ComputeStage, d.sbuf),
+                                       QRhiShaderResourceBinding::uniformBuffer(1, QRhiShaderResourceBinding::ComputeStage, d.computeUniBuf)
+                                   });
+    d.computeBindings->create();
+    d.releasePool << d.computeBindings;
+
+    d.computePipeline = m_r->newComputePipeline();
+    d.computePipeline->setShaderResourceBindings(d.computeBindings);
+    d.computePipeline->setShaderStage({ QRhiShaderStage::Compute, getShader(QLatin1String(":/buffer.comp.qsb")) });
+    d.computePipeline->create();
+    d.releasePool << d.computePipeline;
+
+    // graphics pass
+
+    d.graphicsBindings = m_r->newShaderResourceBindings();
+    d.graphicsBindings->create();
+    d.releasePool << d.graphicsBindings;
+
+    d.graphicsPipeline = m_r->newGraphicsPipeline();
+    d.graphicsPipeline->setTopology(QRhiGraphicsPipeline::Points);
+    d.graphicsPipeline->setShaderStages({
+        { QRhiShaderStage::Vertex, getShader(QLatin1String(":/main.vert.qsb")) },
+        { QRhiShaderStage::Fragment, getShader(QLatin1String(":/main.frag.qsb")) }
+    });
+    QRhiVertexInputLayout inputLayout;
+    inputLayout.setBindings({
+        { 2 * sizeof(float) }
+    });
+    inputLayout.setAttributes({
+        { 0, 0, QRhiVertexInputAttribute::Float2, 0 },
+    });
+    d.graphicsPipeline->setVertexInputLayout(inputLayout);
+    d.graphicsPipeline->setShaderResourceBindings(d.graphicsBindings);
+    d.graphicsPipeline->setRenderPassDescriptor(m_rp);
+    d.graphicsPipeline->create();
+    d.releasePool << d.graphicsPipeline;
+}
+
+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 0
+    u->updateDynamicBuffer(d.computeUniBuf, 0, sizeof(float), &d.step);
+    d.step += 0.01f;
+#endif
+
+    // compute pass
+    cb->beginComputePass(u);
+    cb->setComputePipeline(d.computePipeline);
+    cb->setShaderResources();
+    cb->dispatch(DATA_COUNT / 256, 1, 1);
+    cb->endComputePass();
+
+    // graphics pass
+    cb->beginPass(m_sc->currentFrameRenderTarget(), m_clearColor, { 1.0f, 0 });
+    cb->setGraphicsPipeline(d.graphicsPipeline);
+    cb->setViewport({ 0, 0, float(outputSizeInPixels.width()), float(outputSizeInPixels.height()) });
+    QRhiCommandBuffer::VertexInput vbufBinding(d.sbuf, 0);
+    cb->setVertexInput(0, 1, &vbufBinding);
+    cb->draw(DATA_COUNT);
+    cb->endPass();
+}

tests/manual/rhi/computebuffer/computebuffer.pro

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

tests/manual/rhi/computebuffer/computebuffer.qrc

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+<!DOCTYPE RCC><RCC version="1.0">
+  <qresource>
+    <file>buffer.comp.qsb</file>
+    <file>main.vert.qsb</file>
+    <file>main.frag.qsb</file>
+</qresource>
+</RCC>

tests/manual/rhi/computebuffer/main.frag

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+#version 440
+
+layout(location = 0) out vec4 fragColor;
+
+void main()
+{
+    fragColor = vec4(1.0);
+}

tests/manual/rhi/computebuffer/main.vert

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+#version 440
+
+layout(location = 0) in vec4 position;
+
+out gl_PerVertex { vec4 gl_Position; float gl_PointSize; };
+
+void main()
+{
+    gl_PointSize = 4.0; // required with Vulkan when drawing points
+    gl_Position = position;
+}