qt 6.5.1 original

tests/manual/rhi/instancing/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+#####################################################################
+## instancing Binary:
+#####################################################################
+
+qt_internal_add_manual_test(tst_manual_instancing
+    GUI
+    SOURCES
+        instancing.cpp
+    LIBRARIES
+        Qt::Gui
+        Qt::GuiPrivate
+)
+
+# Resources:
+set(instancing_resource_files
+    "inst.frag.qsb"
+    "inst.vert.qsb"
+)
+
+qt_internal_add_resource(tst_manual_instancing "instancing"
+    PREFIX
+        "/"
+    FILES
+        ${instancing_resource_files}
+)

tests/manual/rhi/instancing/buildshaders.bat

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+qsb --glsl "330,300 es" --hlsl 50 --msl 12 inst.vert -o inst.vert.qsb
+qsb --glsl "330,300 es" --hlsl 50 --msl 12 inst.frag -o inst.frag.qsb

tests/manual/rhi/instancing/inst.frag

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+#version 440
+
+layout(location = 0) in vec3 vColor;
+layout(location = 0) out vec4 fragColor;
+
+void main()
+{
+    fragColor = vec4(vColor, 1.0);
+}

tests/manual/rhi/instancing/inst.vert

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+#version 440
+
+layout(location = 0) in vec4 position;
+
+// Instanced attributes to variate the transform and color of the cube
+layout(location = 1) in mat4 instMat;
+layout(location = 5) in vec3 instColor;
+
+layout(location = 0) out vec3 vColor;
+
+out gl_PerVertex { vec4 gl_Position; };
+
+layout(std140, binding = 0) uniform buf {
+    mat4 mvp;
+} ubuf;
+
+void main()
+{
+    vColor = instColor;
+    gl_Position = ubuf.mvp * instMat * position;
+}

tests/manual/rhi/instancing/instancing.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 "../shared/cube.h"
+#include <QRandomGenerator>
+
+// Instanced draw example. When running with OpenGL, at least 3.3 or ES 3.0 is
+// needed.
+
+const int INSTANCE_COUNT = 1024;
+
+struct {
+    QList<QRhiResource *> releasePool;
+
+    QRhiBuffer *vbuf = nullptr;
+    QRhiBuffer *instBuf = nullptr;
+    QRhiBuffer *ubuf = nullptr;
+    QRhiShaderResourceBindings *srb = nullptr;
+    QRhiGraphicsPipeline *ps = nullptr;
+
+    QRhiResourceUpdateBatch *initialUpdates = nullptr;
+    QMatrix4x4 winProj;
+} d;
+
+void Window::customInit()
+{
+    if (!m_r->isFeatureSupported(QRhi::Instancing))
+        qFatal("Instanced drawing is not supported");
+
+    d.initialUpdates = m_r->nextResourceUpdateBatch();
+
+    d.vbuf = m_r->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, sizeof(cube));
+    d.vbuf->create();
+    d.releasePool << d.vbuf;
+
+    d.initialUpdates->uploadStaticBuffer(d.vbuf, cube);
+
+    // transform + color (mat4 + vec3), interleaved, for each instance
+    d.instBuf = m_r->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, INSTANCE_COUNT * 19 * sizeof(float));
+    d.instBuf->create();
+    d.releasePool << d.instBuf;
+
+    d.ubuf = m_r->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, 64 + 12);
+    d.ubuf->create();
+    d.releasePool << d.ubuf;
+
+    d.srb = m_r->newShaderResourceBindings();
+    d.releasePool << d.srb;
+    d.srb->setBindings({
+        QRhiShaderResourceBinding::uniformBuffer(0, QRhiShaderResourceBinding::VertexStage, d.ubuf)
+    });
+    d.srb->create();
+
+    d.ps = m_r->newGraphicsPipeline();
+    d.releasePool << d.ps;
+    d.ps->setShaderStages({
+        { QRhiShaderStage::Vertex, getShader(QLatin1String(":/inst.vert.qsb")) },
+        { QRhiShaderStage::Fragment, getShader(QLatin1String(":/inst.frag.qsb")) }
+    });
+    QRhiVertexInputLayout inputLayout;
+    inputLayout.setBindings({
+        { 3 * sizeof(float) },                                        // cube vertices
+        { 19 * sizeof(float), QRhiVertexInputBinding::PerInstance },  // per-instance transform and color
+    });
+    inputLayout.setAttributes({
+        { 0, 0, QRhiVertexInputAttribute::Float3, 0 },                     // position
+        { 1, 1, QRhiVertexInputAttribute::Float4, 0, 0 },                  // instMat
+        { 1, 2, QRhiVertexInputAttribute::Float4, 4 * sizeof(float), 1 },
+        { 1, 3, QRhiVertexInputAttribute::Float4, 8 * sizeof(float), 2 },
+        { 1, 4, QRhiVertexInputAttribute::Float4, 12 * sizeof(float), 3 },
+        { 1, 5, QRhiVertexInputAttribute::Float3, 16 * sizeof(float) },     // instColor
+    });
+    d.ps->setVertexInputLayout(inputLayout);
+    d.ps->setShaderResourceBindings(d.srb);
+    d.ps->setRenderPassDescriptor(m_rp);
+    d.ps->create();
+
+    QByteArray instData;
+    instData.resize(INSTANCE_COUNT * 19 * sizeof(float));
+    float *p = reinterpret_cast<float *>(instData.data());
+    QRandomGenerator *rgen = QRandomGenerator::global();
+    for (int i = 0; i < INSTANCE_COUNT; ++i) {
+        QMatrix4x4 m;
+        m.translate(rgen->bounded(8000) / 100.0f - 40.0f,
+                    rgen->bounded(8000) / 100.0f - 40.0f,
+                    0.0f);
+        memcpy(p, m.constData(), 16 * sizeof(float));
+        p += 16;
+        // color
+        *p++ = i / float(INSTANCE_COUNT);
+        *p++ = 0.0f;
+        *p++ = 0.0f;
+    }
+    d.initialUpdates->uploadStaticBuffer(d.instBuf, instData.constData());
+}
+
+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(0.05f);
+        u->updateDynamicBuffer(d.ubuf, 0, 64, mvp.constData());
+    }
+
+    cb->beginPass(m_sc->currentFrameRenderTarget(), m_clearColor, { 1.0f, 0 }, u);
+    cb->setGraphicsPipeline(d.ps);
+    cb->setViewport({ 0, 0, float(outputSizeInPixels.width()), float(outputSizeInPixels.height()) });
+    cb->setShaderResources();
+    const QRhiCommandBuffer::VertexInput vbufBinding[] = {
+        { d.vbuf, 0 },
+        { d.instBuf, 0 }
+    };
+    cb->setVertexInput(0, 2, vbufBinding);
+    cb->draw(36, INSTANCE_COUNT);
+    cb->endPass();
+}

tests/manual/rhi/instancing/instancing.pro

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

tests/manual/rhi/instancing/instancing.qrc

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