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// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "examplewidget.h"
#include "cube.h"
#include <QFile>
#include <QPainter>
static const QSize CUBE_TEX_SIZE(512, 512);
ExampleRhiWidget::ExampleRhiWidget(QWidget *parent)
: QRhiWidget(parent)
{
}
//![init-1]
void ExampleRhiWidget::initialize(QRhiCommandBuffer *)
{
if (m_rhi != rhi()) {
m_rhi = rhi();
scene = {};
emit rhiChanged(QString::fromUtf8(m_rhi->backendName()));
}
if (m_pixelSize != renderTarget()->pixelSize()) {
m_pixelSize = renderTarget()->pixelSize();
emit resized();
}
if (m_sampleCount != renderTarget()->sampleCount()) {
m_sampleCount = renderTarget()->sampleCount();
scene = {};
}
//![init-1]
//![init-2]
if (!scene.vbuf) {
initScene();
updateCubeTexture();
}
scene.mvp = m_rhi->clipSpaceCorrMatrix();
scene.mvp.perspective(45.0f, m_pixelSize.width() / (float) m_pixelSize.height(), 0.01f, 1000.0f);
scene.mvp.translate(0, 0, -4);
updateMvp();
}
//![init-2]
//![rotation-update]
void ExampleRhiWidget::updateMvp()
{
QMatrix4x4 mvp = scene.mvp * QMatrix4x4(QQuaternion::fromEulerAngles(QVector3D(30, itemData.cubeRotation, 0)).toRotationMatrix());
if (!scene.resourceUpdates)
scene.resourceUpdates = m_rhi->nextResourceUpdateBatch();
scene.resourceUpdates->updateDynamicBuffer(scene.ubuf.get(), 0, 64, mvp.constData());
}
//![rotation-update]
//![texture-update]
void ExampleRhiWidget::updateCubeTexture()
{
QImage image(CUBE_TEX_SIZE, QImage::Format_RGBA8888);
const QRect r(QPoint(0, 0), CUBE_TEX_SIZE);
QPainter p(&image);
p.fillRect(r, QGradient::DeepBlue);
QFont font;
font.setPointSize(24);
p.setFont(font);
p.drawText(r, itemData.cubeText);
p.end();
if (!scene.resourceUpdates)
scene.resourceUpdates = m_rhi->nextResourceUpdateBatch();
scene.resourceUpdates->uploadTexture(scene.cubeTex.get(), image);
}
//![texture-update]
static QShader getShader(const QString &name)
{
QFile f(name);
return f.open(QIODevice::ReadOnly) ? QShader::fromSerialized(f.readAll()) : QShader();
}
void ExampleRhiWidget::initScene()
{
//![setup-scene]
scene.vbuf.reset(m_rhi->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, sizeof(cube)));
scene.vbuf->create();
scene.resourceUpdates = m_rhi->nextResourceUpdateBatch();
scene.resourceUpdates->uploadStaticBuffer(scene.vbuf.get(), cube);
scene.ubuf.reset(m_rhi->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, 64));
scene.ubuf->create();
scene.cubeTex.reset(m_rhi->newTexture(QRhiTexture::RGBA8, CUBE_TEX_SIZE));
scene.cubeTex->create();
scene.sampler.reset(m_rhi->newSampler(QRhiSampler::Linear, QRhiSampler::Linear, QRhiSampler::None,
QRhiSampler::ClampToEdge, QRhiSampler::ClampToEdge));
scene.sampler->create();
scene.srb.reset(m_rhi->newShaderResourceBindings());
scene.srb->setBindings({
QRhiShaderResourceBinding::uniformBuffer(0, QRhiShaderResourceBinding::VertexStage, scene.ubuf.get()),
QRhiShaderResourceBinding::sampledTexture(1, QRhiShaderResourceBinding::FragmentStage, scene.cubeTex.get(), scene.sampler.get())
});
scene.srb->create();
scene.ps.reset(m_rhi->newGraphicsPipeline());
scene.ps->setDepthTest(true);
scene.ps->setDepthWrite(true);
scene.ps->setCullMode(QRhiGraphicsPipeline::Back);
scene.ps->setShaderStages({
{ QRhiShaderStage::Vertex, getShader(QLatin1String(":/shader_assets/texture.vert.qsb")) },
{ QRhiShaderStage::Fragment, getShader(QLatin1String(":/shader_assets/texture.frag.qsb")) }
});
QRhiVertexInputLayout inputLayout;
// The cube is provided as non-interleaved sets of positions, UVs, normals.
// Normals are not interesting here, only need the positions and UVs.
inputLayout.setBindings({
{ 3 * sizeof(float) },
{ 2 * sizeof(float) }
});
inputLayout.setAttributes({
{ 0, 0, QRhiVertexInputAttribute::Float3, 0 },
{ 1, 1, QRhiVertexInputAttribute::Float2, 0 }
});
scene.ps->setSampleCount(m_sampleCount);
scene.ps->setVertexInputLayout(inputLayout);
scene.ps->setShaderResourceBindings(scene.srb.get());
scene.ps->setRenderPassDescriptor(renderTarget()->renderPassDescriptor());
scene.ps->create();
//![setup-scene]
}
//![render]
void ExampleRhiWidget::render(QRhiCommandBuffer *cb)
{
if (itemData.cubeRotationDirty) {
itemData.cubeRotationDirty = false;
updateMvp();
}
if (itemData.cubeTextDirty) {
itemData.cubeTextDirty = false;
updateCubeTexture();
}
QRhiResourceUpdateBatch *resourceUpdates = scene.resourceUpdates;
if (resourceUpdates)
scene.resourceUpdates = nullptr;
const QColor clearColor = QColor::fromRgbF(0.4f, 0.7f, 0.0f, 1.0f);
cb->beginPass(renderTarget(), clearColor, { 1.0f, 0 }, resourceUpdates);
cb->setGraphicsPipeline(scene.ps.get());
cb->setViewport(QRhiViewport(0, 0, m_pixelSize.width(), m_pixelSize.height()));
cb->setShaderResources();
const QRhiCommandBuffer::VertexInput vbufBindings[] = {
{ scene.vbuf.get(), 0 },
{ scene.vbuf.get(), quint32(36 * 3 * sizeof(float)) }
};
cb->setVertexInput(0, 2, vbufBindings);
cb->draw(36);
cb->endPass();
}
//![render]
void ExampleRhiWidget::releaseResources()
{
scene = {}; // a subsequent initialize() will recreate everything
}
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