147 lines
3.9 KiB
C++
147 lines
3.9 KiB
C++
// Copyright (C) 2017 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#include "linenode.h"
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#include <QtGui/QColor>
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#include <QtQuick/QSGMaterial>
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class LineShader : public QSGMaterialShader
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{
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public:
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LineShader() {
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setShaderFileName(VertexStage, QLatin1String(":/scenegraph/graph/shaders/line.vert.qsb"));
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setShaderFileName(FragmentStage, QLatin1String(":/scenegraph/graph/shaders/line.frag.qsb"));
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}
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bool updateUniformData(RenderState &state, QSGMaterial *newMaterial, QSGMaterial *oldMaterial) override;
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};
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class LineMaterial : public QSGMaterial
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{
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public:
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LineMaterial()
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{
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setFlag(Blending);
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}
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QSGMaterialType *type() const override
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{
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static QSGMaterialType type;
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return &type;
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}
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QSGMaterialShader *createShader(QSGRendererInterface::RenderMode) const override
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{
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return new LineShader;
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}
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int compare(const QSGMaterial *m) const override
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{
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const LineMaterial *other = static_cast<const LineMaterial *>(m);
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if (int diff = int(state.color.rgb()) - int(other->state.color.rgb()))
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return diff;
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if (int diff = state.size - other->state.size)
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return diff;
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if (int diff = state.spread - other->state.spread)
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return diff;
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return 0;
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}
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struct {
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QColor color;
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float size;
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float spread;
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} state;
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};
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bool LineShader::updateUniformData(RenderState &state, QSGMaterial *newMaterial, QSGMaterial *)
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{
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QByteArray *buf = state.uniformData();
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Q_ASSERT(buf->size() >= 92);
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if (state.isMatrixDirty()) {
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const QMatrix4x4 m = state.combinedMatrix();
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memcpy(buf->data(), m.constData(), 64);
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}
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if (state.isOpacityDirty()) {
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const float opacity = state.opacity();
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memcpy(buf->data() + 80, &opacity, 4);
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}
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LineMaterial *mat = static_cast<LineMaterial *>(newMaterial);
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float c[4];
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mat->state.color.getRgbF(&c[0], &c[1], &c[2], &c[3]);
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memcpy(buf->data() + 64, c, 16);
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memcpy(buf->data() + 84, &mat->state.size, 4);
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memcpy(buf->data() + 88, &mat->state.spread, 4);
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return true;
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}
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struct LineVertex {
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float x;
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float y;
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float t;
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inline void set(float xx, float yy, float tt) { x = xx; y = yy; t = tt; }
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};
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static const QSGGeometry::AttributeSet &attributes()
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{
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static QSGGeometry::Attribute attr[] = {
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QSGGeometry::Attribute::create(0, 2, QSGGeometry::FloatType, true),
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QSGGeometry::Attribute::create(1, 1, QSGGeometry::FloatType)
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};
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static QSGGeometry::AttributeSet set = { 2, 3 * sizeof(float), attr };
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return set;
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}
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LineNode::LineNode(float size, float spread, const QColor &color)
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: m_geometry(attributes(), 0)
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{
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setGeometry(&m_geometry);
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m_geometry.setDrawingMode(QSGGeometry::DrawTriangleStrip);
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LineMaterial *m = new LineMaterial;
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m->state.color = color;
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m->state.size = size;
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m->state.spread = spread;
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setMaterial(m);
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setFlag(OwnsMaterial);
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}
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/*
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* Assumes that samples have values in the range of 0 to 1 and scales them to
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* the height of bounds. The samples are stretched out horizontally along the
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* width of the bounds.
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*
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* The position of each pair of points is identical, but we use the third value
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* "t" to shift the point up or down and to add antialiasing.
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*/
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void LineNode::updateGeometry(const QRectF &bounds, const QList<qreal> &samples)
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{
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m_geometry.allocate(samples.size() * 2);
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float x = bounds.x();
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float y = bounds.y();
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float w = bounds.width();
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float h = bounds.height();
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float dx = w / (samples.size() - 1);
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LineVertex *v = (LineVertex *) m_geometry.vertexData();
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for (int i=0; i<samples.size(); ++i) {
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v[i*2+0].set(x + dx * i, y + samples.at(i) * h, 0);
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v[i*2+1].set(x + dx * i, y + samples.at(i) * h, 1);
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}
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markDirty(QSGNode::DirtyGeometry);
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}
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