| /**************************************************************************** |
| ** |
| ** Copyright (C) 2017 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the examples of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:BSD$ |
| ** Commercial License Usage |
| ** Licensees holding valid commercial Qt licenses may use this file in |
| ** accordance with the commercial license agreement provided with the |
| ** Software or, alternatively, in accordance with the terms contained in |
| ** a written agreement between you and The Qt Company. For licensing terms |
| ** and conditions see https://www.qt.io/terms-conditions. For further |
| ** information use the contact form at https://www.qt.io/contact-us. |
| ** |
| ** BSD License Usage |
| ** Alternatively, you may use this file under the terms of the BSD license |
| ** as follows: |
| ** |
| ** "Redistribution and use in source and binary forms, with or without |
| ** modification, are permitted provided that the following conditions are |
| ** met: |
| ** * Redistributions of source code must retain the above copyright |
| ** notice, this list of conditions and the following disclaimer. |
| ** * Redistributions in binary form must reproduce the above copyright |
| ** notice, this list of conditions and the following disclaimer in |
| ** the documentation and/or other materials provided with the |
| ** distribution. |
| ** * Neither the name of The Qt Company Ltd nor the names of its |
| ** contributors may be used to endorse or promote products derived |
| ** from this software without specific prior written permission. |
| ** |
| ** |
| ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." |
| ** |
| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #include "linenode.h" |
| |
| #include <QtGui/QColor> |
| |
| #include <QtQuick/QSGSimpleMaterial> |
| |
| struct LineMaterial |
| { |
| QColor color; |
| float spread; |
| float size; |
| }; |
| |
| class LineShader : public QSGSimpleMaterialShader<LineMaterial> |
| { |
| QSG_DECLARE_SIMPLE_SHADER(LineShader, LineMaterial) |
| |
| public: |
| LineShader() { |
| setShaderSourceFile(QOpenGLShader::Vertex, ":/scenegraph/graph/shaders/line.vsh"); |
| setShaderSourceFile(QOpenGLShader::Fragment, ":/scenegraph/graph/shaders/line.fsh"); |
| } |
| |
| QList<QByteArray> attributes() const override { return QList<QByteArray>() << "pos" << "t"; } |
| |
| void updateState(const LineMaterial *m, const LineMaterial *) override { |
| program()->setUniformValue(id_color, m->color); |
| program()->setUniformValue(id_spread, m->spread); |
| program()->setUniformValue(id_size, m->size); |
| } |
| |
| void resolveUniforms() override { |
| id_spread = program()->uniformLocation("spread"); |
| id_size = program()->uniformLocation("size"); |
| id_color = program()->uniformLocation("color"); |
| } |
| |
| private: |
| int id_color = -1; |
| int id_spread = -1; |
| int id_size = -1; |
| }; |
| |
| struct LineVertex { |
| float x; |
| float y; |
| float t; |
| inline void set(float xx, float yy, float tt) { x = xx; y = yy; t = tt; } |
| }; |
| |
| static const QSGGeometry::AttributeSet &attributes() |
| { |
| static QSGGeometry::Attribute attr[] = { |
| QSGGeometry::Attribute::create(0, 2, GL_FLOAT, true), |
| QSGGeometry::Attribute::create(1, 1, GL_FLOAT) |
| }; |
| static QSGGeometry::AttributeSet set = { 2, 3 * sizeof(float), attr }; |
| return set; |
| } |
| |
| LineNode::LineNode(float size, float spread, const QColor &color) |
| : m_geometry(attributes(), 0) |
| { |
| setGeometry(&m_geometry); |
| m_geometry.setDrawingMode(GL_TRIANGLE_STRIP); |
| |
| QSGSimpleMaterial<LineMaterial> *m = LineShader::createMaterial(); |
| m->state()->color = color; |
| m->state()->size = size; |
| m->state()->spread = spread; |
| m->setFlag(QSGMaterial::Blending); |
| setMaterial(m); |
| setFlag(OwnsMaterial); |
| } |
| |
| /* |
| * Assumes that samples have values in the range of 0 to 1 and scales them to |
| * the height of bounds. The samples are stretched out horizontally along the |
| * width of the bounds. |
| * |
| * The position of each pair of points is identical, but we use the third value |
| * "t" to shift the point up or down and to add antialiasing. |
| */ |
| void LineNode::updateGeometry(const QRectF &bounds, const QList<qreal> &samples) |
| { |
| m_geometry.allocate(samples.size() * 2); |
| |
| float x = bounds.x(); |
| float y = bounds.y(); |
| float w = bounds.width(); |
| float h = bounds.height(); |
| |
| float dx = w / (samples.size() - 1); |
| |
| LineVertex *v = (LineVertex *) m_geometry.vertexData(); |
| for (int i=0; i<samples.size(); ++i) { |
| v[i*2+0].set(x + dx * i, y + samples.at(i) * h, 0); |
| v[i*2+1].set(x + dx * i, y + samples.at(i) * h, 1); |
| } |
| |
| markDirty(QSGNode::DirtyGeometry); |
| } |