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// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include <QtQuick/QQuickRhiItem>
#include <rhi/qrhi.h>
//![0]
class ExampleRhiItemRenderer : public QQuickRhiItemRenderer
{
public:
void initialize(QRhiCommandBuffer *cb) override;
void synchronize(QQuickRhiItem *item) 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_angle = 0.0f;
};
class ExampleRhiItem : public QQuickRhiItem
{
Q_OBJECT
QML_NAMED_ELEMENT(ExampleRhiItem)
Q_PROPERTY(float angle READ angle WRITE setAngle NOTIFY angleChanged)
public:
QQuickRhiItemRenderer *createRenderer() override;
float angle() const { return m_angle; }
void setAngle(float a);
signals:
void angleChanged();
private:
float m_angle = 0.0f;
};
QQuickRhiItemRenderer *ExampleRhiItem::createRenderer()
{
return new ExampleRhiItemRenderer;
}
void ExampleRhiItem::setAngle(float a)
{
if (m_angle == a)
return;
m_angle = a;
emit angleChanged();
update();
}
void ExampleRhiItemRenderer::synchronize(QQuickRhiItem *rhiItem)
{
ExampleRhiItem *item = static_cast<ExampleRhiItem *>(rhiItem);
if (item->angle() != m_angle)
m_angle = item->angle();
}
static QShader getShader(const QString &name)
{
QFile f(name);
return f.open(QIODevice::ReadOnly) ? QShader::fromSerialized(f.readAll()) : QShader();
}
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,
};
void ExampleRhiItemRenderer::initialize(QRhiCommandBuffer *cb)
{
if (m_rhi != rhi()) {
m_pipeline.reset();
m_rhi = rhi();
}
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(":/shaders/color.vert.qsb")) },
{ QRhiShaderStage::Fragment, getShader(QLatin1String(":/shaders/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);
}
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);
}
void ExampleRhiItemRenderer::render(QRhiCommandBuffer *cb)
{
QRhiResourceUpdateBatch *resourceUpdates = m_rhi->nextResourceUpdateBatch();
QMatrix4x4 modelViewProjection = m_viewProjection;
modelViewProjection.rotate(m_angle, 0, 1, 0);
resourceUpdates->updateDynamicBuffer(m_ubuf.get(), 0, 64, modelViewProjection.constData());
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();
}
//![0]
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