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// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "customitem.h"
#include <QtCore/QPointer>
#include <QtQuick/QSGMaterial>
#include <QtQuick/QSGTexture>
#include <QtQuick/QSGGeometryNode>
#include <QtQuick/QSGTextureProvider>
//! [2]
class CustomShader : public QSGMaterialShader
{
public:
CustomShader()
{
setShaderFileName(VertexStage, QLatin1String(":/scenegraph/custommaterial/shaders/mandelbrot.vert.qsb"));
setShaderFileName(FragmentStage, QLatin1String(":/scenegraph/custommaterial/shaders/mandelbrot.frag.qsb"));
}
bool updateUniformData(RenderState &state,
QSGMaterial *newMaterial, QSGMaterial *oldMaterial) override;
};
//! [2]
//! [1]
class CustomMaterial : public QSGMaterial
{
public:
CustomMaterial();
QSGMaterialType *type() const override;
int compare(const QSGMaterial *other) const override;
QSGMaterialShader *createShader(QSGRendererInterface::RenderMode) const override
{
return new CustomShader;
}
struct {
float center[2];
float zoom;
int limit;
bool dirty;
} uniforms;
};
//! [1]
CustomMaterial::CustomMaterial()
{
}
QSGMaterialType *CustomMaterial::type() const
{
static QSGMaterialType type;
return &type;
}
int CustomMaterial::compare(const QSGMaterial *o) const
{
Q_ASSERT(o && type() == o->type());
const auto *other = static_cast<const CustomMaterial *>(o);
return other == this ? 0 : 1; // ### TODO: compare state???
}
//! [3]
bool CustomShader::updateUniformData(RenderState &state, QSGMaterial *newMaterial, QSGMaterial *oldMaterial)
{
bool changed = false;
QByteArray *buf = state.uniformData();
Q_ASSERT(buf->size() >= 84);
if (state.isMatrixDirty()) {
const QMatrix4x4 m = state.combinedMatrix();
memcpy(buf->data(), m.constData(), 64);
changed = true;
}
if (state.isOpacityDirty()) {
const float opacity = state.opacity();
memcpy(buf->data() + 64, &opacity, 4);
changed = true;
}
auto *customMaterial = static_cast<CustomMaterial *>(newMaterial);
if (oldMaterial != newMaterial || customMaterial->uniforms.dirty) {
memcpy(buf->data() + 68, &customMaterial->uniforms.zoom, 4);
memcpy(buf->data() + 72, &customMaterial->uniforms.center, 8);
memcpy(buf->data() + 80, &customMaterial->uniforms.limit, 4);
customMaterial->uniforms.dirty = false;
changed = true;
}
return changed;
}
//! [3]
//! [4]
class CustomNode : public QSGGeometryNode
{
public:
CustomNode()
{
auto *m = new CustomMaterial;
setMaterial(m);
setFlag(OwnsMaterial, true);
QSGGeometry *g = new QSGGeometry(QSGGeometry::defaultAttributes_TexturedPoint2D(), 4);
QSGGeometry::updateTexturedRectGeometry(g, QRect(), QRect());
setGeometry(g);
setFlag(OwnsGeometry, true);
}
void setRect(const QRectF &bounds)
{
QSGGeometry::updateTexturedRectGeometry(geometry(), bounds, QRectF(0, 0, 1, 1));
markDirty(QSGNode::DirtyGeometry);
}
void setZoom(qreal zoom)
{
auto *m = static_cast<CustomMaterial *>(material());
m->uniforms.zoom = zoom;
m->uniforms.dirty = true;
markDirty(DirtyMaterial);
}
void setLimit(int limit)
{
auto *m = static_cast<CustomMaterial *>(material());
m->uniforms.limit = limit;
m->uniforms.dirty = true;
markDirty(DirtyMaterial);
}
void setCenter(const QPointF ¢er)
{
auto *m = static_cast<CustomMaterial *>(material());
m->uniforms.center[0] = center.x();
m->uniforms.center[1] = center.y();
m->uniforms.dirty = true;
markDirty(DirtyMaterial);
}
};
//! [4]
CustomItem::CustomItem(QQuickItem *parent)
: QQuickItem(parent)
{
setFlag(ItemHasContents, true);
}
//! [5]
void CustomItem::setZoom(qreal zoom)
{
if (qFuzzyCompare(m_zoom, zoom))
return;
m_zoom = zoom;
m_zoomChanged = true;
emit zoomChanged(m_zoom);
update();
}
void CustomItem::setIterationLimit(int limit)
{
if (m_limit == limit)
return;
m_limit = limit;
m_limitChanged = true;
emit iterationLimitChanged(m_limit);
update();
}
void CustomItem::setCenter(QPointF center)
{
if (m_center == center)
return;
m_center = center;
m_centerChanged = true;
emit centerChanged(m_center);
update();
}
//! [5]
void CustomItem::geometryChange(const QRectF &newGeometry, const QRectF &oldGeometry)
{
m_geometryChanged = true;
update();
QQuickItem::geometryChange(newGeometry, oldGeometry);
}
//! [6]
QSGNode *CustomItem::updatePaintNode(QSGNode *old, UpdatePaintNodeData *)
{
auto *node = static_cast<CustomNode *>(old);
if (!node)
node = new CustomNode;
if (m_geometryChanged)
node->setRect(boundingRect());
m_geometryChanged = false;
if (m_zoomChanged)
node->setZoom(m_zoom);
m_zoomChanged = false;
if (m_limitChanged)
node->setLimit(m_limit);
m_limitChanged = false;
if (m_centerChanged)
node->setCenter(m_center);
m_centerChanged = false;
return node;
}
//! [6]
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