10 files changed, 250 insertions, 0 deletions
diff --git a/examples/widgets/rhi/simplerhiwidget/CMakeLists.txt b/examples/widgets/rhi/simplerhiwidget/CMakeLists.txt
new file mode 100644
index 0000000000..cf471f1f8a
--- /dev/null
+++ b/examples/widgets/rhi/simplerhiwidget/CMakeLists.txt
@@ -0,0 +1,48 @@
+# Copyright (C) 2023 The Qt Company Ltd.
+# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+cmake_minimum_required(VERSION 3.16)
+project(simplerhiwidget LANGUAGES CXX)
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets)
+
+qt_standard_project_setup()
+
+qt_add_executable(simplerhiwidget
+    examplewidget.cpp examplewidget.h
+    main.cpp
+)
+
+set_target_properties(simplerhiwidget PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+# needs GuiPrivate to be able to include <rhi/qrhi.h>
+target_link_libraries(simplerhiwidget PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::GuiPrivate
+    Qt6::Widgets
+)
+
+qt_add_resources(simplerhiwidget "simplerhiwidget"
+    PREFIX
+        "/"
+    FILES
+        "shader_assets/color.vert.qsb"
+        "shader_assets/color.frag.qsb"
+)
+
+install(TARGETS simplerhiwidget
+    BUNDLE  DESTINATION .
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+)
+
+qt_generate_deploy_app_script(
+    TARGET simplerhiwidget
+    OUTPUT_SCRIPT deploy_script
+    NO_UNSUPPORTED_PLATFORM_ERROR
+)
+install(SCRIPT ${deploy_script})
diff --git a/examples/widgets/rhi/simplerhiwidget/examplewidget.cpp b/examples/widgets/rhi/simplerhiwidget/examplewidget.cpp
new file mode 100644
index 0000000000..7de33059a3
--- /dev/null
+++ b/examples/widgets/rhi/simplerhiwidget/examplewidget.cpp
@@ -0,0 +1,102 @@
+// Copyright (C) 2023 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "examplewidget.h"
+#include <QFile>
+
+static float vertexData[] = {
+     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,
+};
+
+//![get-shader]
+static QShader getShader(const QString &name)
+{
+    QFile f(name);
+    return f.open(QIODevice::ReadOnly) ? QShader::fromSerialized(f.readAll()) : QShader();
+}
+//![get-shader]
+
+//![init-1]
+void ExampleRhiWidget::initialize(QRhiCommandBuffer *cb)
+{
+    if (m_rhi != rhi()) {
+        m_pipeline.reset();
+        m_rhi = rhi();
+    }
+//![init-1]
+//![init-pipeline]
+    if (!m_pipeline) {
+        m_vbuf.reset(m_rhi->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, sizeof(vertexData)));
+        m_vbuf->create();
+
+        m_ubuf.reset(m_rhi->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, 64));
+        m_ubuf->create();
+
+        m_srb.reset(m_rhi->newShaderResourceBindings());
+        m_srb->setBindings({
+            QRhiShaderResourceBinding::uniformBuffer(0, QRhiShaderResourceBinding::VertexStage, m_ubuf.get()),
+        });
+        m_srb->create();
+
+        m_pipeline.reset(m_rhi->newGraphicsPipeline());
+        m_pipeline->setShaderStages({
+            { QRhiShaderStage::Vertex, getShader(QLatin1String(":/shader_assets/color.vert.qsb")) },
+            { QRhiShaderStage::Fragment, getShader(QLatin1String(":/shader_assets/color.frag.qsb")) }
+        });
+        QRhiVertexInputLayout inputLayout;
+        inputLayout.setBindings({
+            { 5 * sizeof(float) }
+        });
+        inputLayout.setAttributes({
+            { 0, 0, QRhiVertexInputAttribute::Float2, 0 },
+            { 0, 1, QRhiVertexInputAttribute::Float3, 2 * sizeof(float) }
+        });
+        m_pipeline->setVertexInputLayout(inputLayout);
+        m_pipeline->setShaderResourceBindings(m_srb.get());
+        m_pipeline->setRenderPassDescriptor(renderTarget()->renderPassDescriptor());
+        m_pipeline->create();
+
+        QRhiResourceUpdateBatch *resourceUpdates = m_rhi->nextResourceUpdateBatch();
+        resourceUpdates->uploadStaticBuffer(m_vbuf.get(), vertexData);
+        cb->resourceUpdate(resourceUpdates);
+    }
+//![init-pipeline]
+
+//![init-matrix]
+    const QSize outputSize = renderTarget()->pixelSize();
+    m_viewProjection = m_rhi->clipSpaceCorrMatrix();
+    m_viewProjection.perspective(45.0f, outputSize.width() / (float) outputSize.height(), 0.01f, 1000.0f);
+    m_viewProjection.translate(0, 0, -4);
+}
+//![init-matrix]
+
+//![render-1]
+void ExampleRhiWidget::render(QRhiCommandBuffer *cb)
+{
+    QRhiResourceUpdateBatch *resourceUpdates = m_rhi->nextResourceUpdateBatch();
+    m_rotation += 1.0f;
+    QMatrix4x4 modelViewProjection = m_viewProjection;
+    modelViewProjection.rotate(m_rotation, 0, 1, 0);
+    resourceUpdates->updateDynamicBuffer(m_ubuf.get(), 0, 64, modelViewProjection.constData());
+//![render-1]
+//![render-pass]
+    const QColor clearColor = QColor::fromRgbF(0.4f, 0.7f, 0.0f, 1.0f);
+    cb->beginPass(renderTarget(), clearColor, { 1.0f, 0 }, resourceUpdates);
+
+    cb->setGraphicsPipeline(m_pipeline.get());
+    const QSize outputSize = renderTarget()->pixelSize();
+    cb->setViewport(QRhiViewport(0, 0, outputSize.width(), outputSize.height()));
+    cb->setShaderResources();
+    const QRhiCommandBuffer::VertexInput vbufBinding(m_vbuf.get(), 0);
+    cb->setVertexInput(0, 1, &vbufBinding);
+    cb->draw(3);
+
+    cb->endPass();
+//![render-pass]
+
+//![render-2]
+    update();
+}
+//![render-2]
diff --git a/examples/widgets/rhi/simplerhiwidget/examplewidget.h b/examples/widgets/rhi/simplerhiwidget/examplewidget.h
new file mode 100644
index 0000000000..efd3b90d91
--- /dev/null
+++ b/examples/widgets/rhi/simplerhiwidget/examplewidget.h
@@ -0,0 +1,30 @@
+// Copyright (C) 2023 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef EXAMPLEWIDGET_H
+#define EXAMPLEWIDGET_H
+
+//![0]
+#include <QRhiWidget>
+#include <rhi/qrhi.h>
+
+class ExampleRhiWidget : public QRhiWidget
+{
+public:
+    ExampleRhiWidget(QWidget *parent = nullptr) : QRhiWidget(parent) { }
+
+    void initialize(QRhiCommandBuffer *cb) override;
+    void render(QRhiCommandBuffer *cb) override;
+
+private:
+    QRhi *m_rhi = nullptr;
+    std::unique_ptr<QRhiBuffer> m_vbuf;
+    std::unique_ptr<QRhiBuffer> m_ubuf;
+    std::unique_ptr<QRhiShaderResourceBindings> m_srb;
+    std::unique_ptr<QRhiGraphicsPipeline> m_pipeline;
+    QMatrix4x4 m_viewProjection;
+    float m_rotation = 0.0f;
+};
+//![0]
+
+#endif
diff --git a/examples/widgets/rhi/simplerhiwidget/main.cpp b/examples/widgets/rhi/simplerhiwidget/main.cpp
new file mode 100644
index 0000000000..b9cf848125
--- /dev/null
+++ b/examples/widgets/rhi/simplerhiwidget/main.cpp
@@ -0,0 +1,26 @@
+// Copyright (C) 2023 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QApplication>
+#include <QVBoxLayout>
+#include <QHBoxLayout>
+#include "examplewidget.h"
+
+//![0]
+int main(int argc, char **argv)
+{
+    QApplication app(argc, argv);
+
+    ExampleRhiWidget *rhiWidget = new ExampleRhiWidget;
+
+    QVBoxLayout *layout = new QVBoxLayout;
+    layout->addWidget(rhiWidget);
+
+    QWidget w;
+    w.setLayout(layout);
+    w.resize(1280, 720);
+    w.show();
+
+    return app.exec();
+}
+//![0]
diff --git a/examples/widgets/rhi/simplerhiwidget/shader_assets/color.frag.qsb b/examples/widgets/rhi/simplerhiwidget/shader_assets/color.frag.qsb
new file mode 100644
index 0000000000..32bd2d5953
--- /dev/null
+++ b/examples/widgets/rhi/simplerhiwidget/shader_assets/color.frag.qsb
diff --git a/examples/widgets/rhi/simplerhiwidget/shader_assets/color.vert.qsb b/examples/widgets/rhi/simplerhiwidget/shader_assets/color.vert.qsb
new file mode 100644
index 0000000000..bf97035d7e
--- /dev/null
+++ b/examples/widgets/rhi/simplerhiwidget/shader_assets/color.vert.qsb
diff --git a/examples/widgets/rhi/simplerhiwidget/shaders/color.frag b/examples/widgets/rhi/simplerhiwidget/shaders/color.frag
new file mode 100644
index 0000000000..375587662f
--- /dev/null
+++ b/examples/widgets/rhi/simplerhiwidget/shaders/color.frag
@@ -0,0 +1,10 @@
+#version 440
+
+layout(location = 0) in vec3 v_color;
+
+layout(location = 0) out vec4 fragColor;
+
+void main()
+{
+    fragColor = vec4(v_color, 1.0);
+}
diff --git a/examples/widgets/rhi/simplerhiwidget/shaders/color.vert b/examples/widgets/rhi/simplerhiwidget/shaders/color.vert
new file mode 100644
index 0000000000..e876f290e7
--- /dev/null
+++ b/examples/widgets/rhi/simplerhiwidget/shaders/color.vert
@@ -0,0 +1,16 @@
+#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;
+};
+
+void main()
+{
+    v_color = color;
+    gl_Position = mvp * position;
+}
diff --git a/examples/widgets/rhi/simplerhiwidget/simplerhiwidget.pro b/examples/widgets/rhi/simplerhiwidget/simplerhiwidget.pro
new file mode 100644
index 0000000000..2477d7f368
--- /dev/null
+++ b/examples/widgets/rhi/simplerhiwidget/simplerhiwidget.pro
@@ -0,0 +1,12 @@
+TEMPLATE = app
+
+# needs gui-private to be able to include <rhi/qrhi.h>
+QT += gui-private widgets
+
+HEADERS += examplewidget.h
+SOURCES += examplewidget.cpp main.cpp
+
+RESOURCES += simplerhiwidget.qrc
+
+target.path = $$[QT_INSTALL_EXAMPLES]/widgets/rhi/simplerhiwidget
+INSTALLS += target
diff --git a/examples/widgets/rhi/simplerhiwidget/simplerhiwidget.qrc b/examples/widgets/rhi/simplerhiwidget/simplerhiwidget.qrc
new file mode 100644
index 0000000000..ddc6dfbe5a
--- /dev/null
+++ b/examples/widgets/rhi/simplerhiwidget/simplerhiwidget.qrc
@@ -0,0 +1,6 @@
+<!DOCTYPE RCC><RCC version="1.0">
+<qresource prefix="/">
+   <file>shader_assets/color.vert.qsb</file>
+   <file>shader_assets/color.frag.qsb</file>
+</qresource>
+</RCC>