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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include "examplewidget.h"
#include "../shared/cube.h"
#include <QFile>
#include <QPainter>
static const QSize CUBE_TEX_SIZE(512, 512);
ExampleRhiWidget::ExampleRhiWidget(QWidget *parent, Qt::WindowFlags f)
: QRhiWidget(parent, f)
{
setDebugLayer(true);
}
void ExampleRhiWidget::initialize(QRhi *rhi, QRhiTexture *outputTexture)
{
if (m_rhi != rhi) {
m_rt.reset();
m_rp.reset();
m_ds.reset();
scene.vbuf.reset();
} else if (m_output != outputTexture) {
m_rt.reset();
m_rp.reset();
}
m_rhi = rhi;
m_output = outputTexture;
if (!m_ds) {
m_ds.reset(m_rhi->newRenderBuffer(QRhiRenderBuffer::DepthStencil, m_output->pixelSize()));
m_ds->create();
} else if (m_ds->pixelSize() != m_output->pixelSize()) {
m_ds->setPixelSize(m_output->pixelSize());
m_ds->create();
}
if (!m_rt) {
m_rt.reset(m_rhi->newTextureRenderTarget({ { m_output }, m_ds.data() }));
m_rp.reset(m_rt->newCompatibleRenderPassDescriptor());
m_rt->setRenderPassDescriptor(m_rp.data());
m_rt->create();
}
if (!scene.vbuf) {
initScene();
updateCubeTexture();
}
const QSize outputSize = m_output->pixelSize();
scene.mvp = m_rhi->clipSpaceCorrMatrix();
scene.mvp.perspective(45.0f, outputSize.width() / (float) outputSize.height(), 0.01f, 1000.0f);
scene.mvp.translate(0, 0, -4);
updateMvp();
}
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.data(), 0, 64, mvp.constData());
}
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.data(), image);
}
static QShader getShader(const QString &name)
{
QFile f(name);
if (f.open(QIODevice::ReadOnly))
return QShader::fromSerialized(f.readAll());
return QShader();
}
void ExampleRhiWidget::initScene()
{
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.data(), cube);
scene.ubuf.reset(m_rhi->newBuffer(QRhiBuffer::Dynamic, QRhiBuffer::UniformBuffer, 68));
scene.ubuf->create();
const qint32 flip = 0;
scene.resourceUpdates->updateDynamicBuffer(scene.ubuf.data(), 64, 4, &flip);
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 | QRhiShaderResourceBinding::FragmentStage, scene.ubuf.data()),
QRhiShaderResourceBinding::sampledTexture(1, QRhiShaderResourceBinding::FragmentStage, scene.cubeTex.data(), scene.sampler.data())
});
scene.srb->create();
scene.ps.reset(m_rhi->newGraphicsPipeline());
scene.ps->setDepthTest(true);
scene.ps->setDepthWrite(true);
scene.ps->setDepthOp(QRhiGraphicsPipeline::Less);
scene.ps->setCullMode(QRhiGraphicsPipeline::Back);
scene.ps->setFrontFace(QRhiGraphicsPipeline::CCW);
QShader vs = getShader(QLatin1String(":/texture.vert.qsb"));
Q_ASSERT(vs.isValid());
QShader fs = getShader(QLatin1String(":/texture.frag.qsb"));
Q_ASSERT(fs.isValid());
scene.ps->setShaderStages({
{ QRhiShaderStage::Vertex, vs },
{ QRhiShaderStage::Fragment, fs }
});
QRhiVertexInputLayout inputLayout;
inputLayout.setBindings({
{ 3 * sizeof(float) },
{ 2 * sizeof(float) }
});
inputLayout.setAttributes({
{ 0, 0, QRhiVertexInputAttribute::Float3, 0 },
{ 1, 1, QRhiVertexInputAttribute::Float2, 0 }
});
scene.ps->setVertexInputLayout(inputLayout);
scene.ps->setShaderResourceBindings(scene.srb.data());
scene.ps->setRenderPassDescriptor(m_rp.data());
scene.ps->create();
}
void ExampleRhiWidget::render(QRhiCommandBuffer *cb)
{
if (itemData.cubeRotationDirty) {
itemData.cubeRotationDirty = false;
updateMvp();
}
if (itemData.cubeTextDirty) {
itemData.cubeTextDirty = false;
updateCubeTexture();
}
QRhiResourceUpdateBatch *rub = scene.resourceUpdates;
if (rub)
scene.resourceUpdates = nullptr;
const QColor clearColor = QColor::fromRgbF(0.4f, 0.7f, 0.0f, 1.0f);
cb->beginPass(m_rt.data(), clearColor, { 1.0f, 0 }, rub);
cb->setGraphicsPipeline(scene.ps.data());
const QSize outputSize = m_output->pixelSize();
cb->setViewport(QRhiViewport(0, 0, outputSize.width(), outputSize.height()));
cb->setShaderResources();
const QRhiCommandBuffer::VertexInput vbufBindings[] = {
{ scene.vbuf.data(), 0 },
{ scene.vbuf.data(), quint32(36 * 3 * sizeof(float)) }
};
cb->setVertexInput(0, 2, vbufBindings);
cb->draw(36);
cb->endPass();
}
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