qt 6.5.1 original

tests/manual/rhi/mrt/CMakeLists.txt

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

tests/manual/rhi/mrt/buildshaders.bat

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+qsb --glsl "100 es,120" --hlsl 50 --msl 12 -c mrt.vert -o mrt.vert.qsb
+qsb --glsl "100 es,120" --hlsl 50 --msl 12 -c mrt.frag -o mrt.frag.qsb

tests/manual/rhi/mrt/mrt.cpp

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+// Copyright (C) 2018 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "../shared/examplefw.h"
+
+// Exercises MRT, by attaching 4 textures to a single QRhiTextureRenderTarget.
+// The fragment shader outputs to all four targets.
+// The textures are then used to render 4 quads, so their contents can be confirmed.
+
+const int ATTCOUNT = 4;
+
+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
+};
+
+static float triangleData[] =
+{ // Y up, CCW
+     0.0f,   0.5f,   1.0f, 0.0f, 0.0f,
+    -0.5f,  -0.5f,   0.0f, 1.0f, 0.0f,
+     0.5f,  -0.5f,   0.0f, 0.0f, 1.0f,
+};
+
+struct {
+    QList<QRhiResource *> releasePool;
+    QRhiBuffer *vbuf = nullptr;
+    QRhiBuffer *ibuf = nullptr;
+    QRhiBuffer *ubuf = nullptr;
+    QRhiTextureRenderTarget *rt = nullptr;
+    QRhiRenderPassDescriptor *rtRp = nullptr;
+    QRhiSampler *sampler = nullptr;
+    QRhiGraphicsPipeline *ps = nullptr;
+    QRhiResourceUpdateBatch *initialUpdates = nullptr;
+    QMatrix4x4 winProj;
+    struct PerColorBuffer {
+        QRhiTexture *tex = nullptr;
+        QRhiShaderResourceBindings *srb = nullptr;
+    };
+    PerColorBuffer colData[ATTCOUNT];
+
+    QRhiBuffer *triUbuf = nullptr;
+    QRhiShaderResourceBindings *triSrb = nullptr;
+    QRhiGraphicsPipeline *triPs = nullptr;
+    float triRot = 0;
+    QMatrix4x4 triBaseMvp;
+} d;
+
+void Window::customInit()
+{
+    qDebug("Max color attachments: %d", m_r->resourceLimit(QRhi::MaxColorAttachments));
+    if (m_r->resourceLimit(QRhi::MaxColorAttachments) < 4)
+        qWarning("MRT is not supported");
+
+    d.vbuf = m_r->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, sizeof(quadVertexData) + sizeof(triangleData));
+    d.vbuf->create();
+    d.releasePool << d.vbuf;
+
+    d.ibuf = m_r->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::IndexBuffer, sizeof(quadIndexData));
+    d.ibuf->create();
+    d.releasePool << d.ibuf;
+
+    const int oneRoundedUniformBlockSize = m_r->ubufAligned(68);
+    d.ubuf = m_r->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, oneRoundedUniformBlockSize * ATTCOUNT);
+    d.ubuf->create();
+    d.releasePool << d.ubuf;
+
+    d.sampler = m_r->newSampler(QRhiSampler::Linear, QRhiSampler::Linear, QRhiSampler::None,
+                                QRhiSampler::ClampToEdge, QRhiSampler::ClampToEdge);
+    d.releasePool << d.sampler;
+    d.sampler->create();
+
+    for (int i = 0; i < ATTCOUNT; ++i) {
+        QRhiTexture *tex = m_r->newTexture(QRhiTexture::RGBA8, QSize(512, 512), 1, QRhiTexture::RenderTarget);
+        d.releasePool << tex;
+        tex->create();
+
+        QRhiShaderResourceBindings *srb = m_r->newShaderResourceBindings();
+        d.releasePool << srb;
+        srb->setBindings({
+            QRhiShaderResourceBinding::uniformBuffer(0, QRhiShaderResourceBinding::VertexStage | QRhiShaderResourceBinding::FragmentStage,
+                             d.ubuf, i * oneRoundedUniformBlockSize, 68),
+            QRhiShaderResourceBinding::sampledTexture(1, QRhiShaderResourceBinding::FragmentStage, tex, d.sampler)
+        });
+        srb->create();
+
+        d.colData[i].tex = tex;
+        d.colData[i].srb = srb;
+    }
+
+    QRhiTextureRenderTargetDescription rtDesc;
+    QRhiColorAttachment att[ATTCOUNT];
+    for (int i = 0; i < ATTCOUNT; ++i)
+        att[i] = QRhiColorAttachment(d.colData[i].tex);
+    rtDesc.setColorAttachments(att, att + ATTCOUNT);
+    d.rt = m_r->newTextureRenderTarget(rtDesc);
+    d.releasePool << d.rt;
+    d.rtRp = d.rt->newCompatibleRenderPassDescriptor();
+    d.releasePool << d.rtRp;
+    d.rt->setRenderPassDescriptor(d.rtRp);
+    d.rt->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, quint32(2 * sizeof(float)) }
+    });
+    d.ps->setVertexInputLayout(inputLayout);
+    d.ps->setShaderResourceBindings(d.colData[0].srb); // all of them are layout-compatible
+    d.ps->setRenderPassDescriptor(m_rp);
+    d.ps->create();
+
+    d.initialUpdates = m_r->nextResourceUpdateBatch();
+    d.initialUpdates->uploadStaticBuffer(d.vbuf, 0, sizeof(quadVertexData), quadVertexData);
+    d.initialUpdates->uploadStaticBuffer(d.vbuf, sizeof(quadVertexData), sizeof(triangleData), triangleData);
+    d.initialUpdates->uploadStaticBuffer(d.ibuf, quadIndexData);
+
+    qint32 flip = m_r->isYUpInFramebuffer() ? 1 : 0;
+    for (int i = 0; i < ATTCOUNT; ++i)
+        d.initialUpdates->updateDynamicBuffer(d.ubuf, i * oneRoundedUniformBlockSize + 64, 4, &flip);
+
+    // triangle
+    d.triUbuf = m_r->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, 68);
+    d.releasePool << d.triUbuf;
+    d.triUbuf->create();
+
+    d.triSrb = m_r->newShaderResourceBindings();
+    d.releasePool << d.triSrb;
+    d.triSrb->setBindings({
+        QRhiShaderResourceBinding::uniformBuffer(0, QRhiShaderResourceBinding::VertexStage | QRhiShaderResourceBinding::FragmentStage, d.triUbuf)
+    });
+    d.triSrb->create();
+
+    d.triPs = m_r->newGraphicsPipeline();
+    d.releasePool << d.triPs;
+    d.triPs->setShaderStages({
+        { QRhiShaderStage::Vertex, getShader(QLatin1String(":/mrt.vert.qsb")) },
+        { QRhiShaderStage::Fragment, getShader(QLatin1String(":/mrt.frag.qsb")) }
+    });
+
+    QRhiGraphicsPipeline::TargetBlend blends[ATTCOUNT]; // defaults to blending == false
+    d.triPs->setTargetBlends(blends, blends + ATTCOUNT);
+
+    inputLayout.setBindings({
+        { 5 * sizeof(float) }
+    });
+    inputLayout.setAttributes({
+        { 0, 0, QRhiVertexInputAttribute::Float2, 0 },
+        { 0, 1, QRhiVertexInputAttribute::Float3, quint32(2 * sizeof(float)) }
+    });
+    d.triPs->setVertexInputLayout(inputLayout);
+    d.triPs->setShaderResourceBindings(d.triSrb);
+    d.triPs->setRenderPassDescriptor(d.rtRp);
+    d.triPs->create();
+
+    d.triBaseMvp = m_r->clipSpaceCorrMatrix();
+    d.triBaseMvp.perspective(45.0f, d.rt->pixelSize().width() / float(d.rt->pixelSize().height()), 0.01f, 1000.0f);
+    d.triBaseMvp.translate(0, 0, -2);
+    float opacity = 1.0f;
+    d.initialUpdates->updateDynamicBuffer(d.triUbuf, 64, 4, &opacity);
+}
+
+void Window::customRelease()
+{
+    qDeleteAll(d.releasePool);
+    d.releasePool.clear();
+}
+
+void Window::customRender()
+{
+    QRhiCommandBuffer *cb = m_sc->currentFrameCommandBuffer();
+    QRhiResourceUpdateBatch *u = m_r->nextResourceUpdateBatch();
+    if (d.initialUpdates) {
+        u->merge(d.initialUpdates);
+        d.initialUpdates->release();
+        d.initialUpdates = nullptr;
+    }
+
+    QMatrix4x4 triMvp = d.triBaseMvp;
+    triMvp.rotate(d.triRot, 0, 1, 0);
+    d.triRot += 1;
+    u->updateDynamicBuffer(d.triUbuf, 0, 64, triMvp.constData());
+
+    cb->beginPass(d.rt, QColor::fromRgbF(0.5f, 0.2f, 0.0f, 1.0f), { 1.0f, 0 }, u);
+    cb->setGraphicsPipeline(d.triPs);
+    cb->setViewport({ 0, 0, float(d.rt->pixelSize().width()), float(d.rt->pixelSize().height()) });
+    cb->setShaderResources();
+    QRhiCommandBuffer::VertexInput vbufBinding(d.vbuf, quint32(sizeof(quadVertexData)));
+    cb->setVertexInput(0, 1, &vbufBinding);
+    cb->draw(3);
+    cb->endPass();
+
+    u = m_r->nextResourceUpdateBatch();
+    if (d.winProj != m_proj) {
+        d.winProj = m_proj;
+        const int oneRoundedUniformBlockSize = m_r->ubufAligned(68);
+        for (int i = 0; i < ATTCOUNT; ++i) {
+            QMatrix4x4 mvp = m_proj;
+            switch (i) {
+            case 0:
+                mvp.translate(-2.0f, 0, 0);
+                break;
+            case 1:
+                mvp.translate(-0.8f, 0, 0);
+                break;
+            case 2:
+                mvp.translate(0.4f, 0, 0);
+                break;
+            case 3:
+                mvp.translate(1.6f, 0, 0);
+                break;
+            default:
+                Q_UNREACHABLE();
+                break;
+            }
+            u->updateDynamicBuffer(d.ubuf, i * oneRoundedUniformBlockSize, 64, mvp.constData());
+        }
+    }
+
+    const QSize outputSizeInPixels = m_sc->currentPixelSize();
+    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()) });
+    vbufBinding.second = 0;
+    cb->setVertexInput(0, 1, &vbufBinding, d.ibuf, 0, QRhiCommandBuffer::IndexUInt16);
+    for (int i = 0; i < ATTCOUNT; ++i) {
+        cb->setShaderResources(d.colData[i].srb);
+        cb->drawIndexed(6);
+    }
+    cb->endPass();
+}

tests/manual/rhi/mrt/mrt.frag

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+#version 440
+
+layout(location = 0) in vec3 v_color;
+
+layout(location = 0) out vec4 c0;
+layout(location = 1) out vec4 c1;
+layout(location = 2) out vec4 c2;
+layout(location = 3) out vec4 c3;
+
+layout(std140, binding = 0) uniform buf {
+    mat4 mvp;
+    float opacity;
+} ubuf;
+
+void main()
+{
+    vec4 c = vec4(v_color * ubuf.opacity, ubuf.opacity);
+    c0 = vec4(c.r, 0, 0, c.a);
+    c1 = vec4(0, c.g, 0, c.a);
+    c2 = vec4(0, 0, c.b, c.a);
+    c3 = c;
+}

tests/manual/rhi/mrt/mrt.pro

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

tests/manual/rhi/mrt/mrt.qrc

@@ -0,0 +1,8 @@
+<!DOCTYPE RCC><RCC version="1.0">
+  <qresource>
+    <file>mrt.vert.qsb</file>
+    <file>mrt.frag.qsb</file>
+    <file alias="texture.vert.qsb">../shared/texture.vert.qsb</file>
+    <file alias="texture.frag.qsb">../shared/texture.frag.qsb</file>
+</qresource>
+</RCC>

tests/manual/rhi/mrt/mrt.vert

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+#version 440
+
+layout(location = 0) in vec4 position;
+layout(location = 1) in vec3 color;
+
+layout(location = 0) out vec3 v_color;
+
+layout(std140, binding = 0) uniform buf {
+    mat4 mvp;
+    float opacity;
+} ubuf;
+
+out gl_PerVertex { vec4 gl_Position; };
+
+void main()
+{
+    v_color = color;
+    gl_Position = ubuf.mvp * position;
+}