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/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd
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** All rights reserved.
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** For any questions to The Qt Company, please use contact form at http://qt.io
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**
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** This file is part of the Qt Charts module.
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**
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** Licensees holding valid commercial license for Qt may use this file in
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** accordance with the Qt License Agreement provided with the Software
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** or, alternatively, in accordance with the terms contained in a written
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** agreement between you and The Qt Company.
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**
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** If you have questions regarding the use of this file, please use
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** contact form at http://qt.io
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**
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****************************************************************************/
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#ifndef QT_NO_OPENGL
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#include "private/glwidget_p.h"
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#include "private/glxyseriesdata_p.h"
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#include <QtGui/QOpenGLShaderProgram>
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#include <QtGui/QOpenGLContext>
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#include <QtGui/QOpenGLBuffer>
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//#define QDEBUG_TRACE_GL_FPS
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#ifdef QDEBUG_TRACE_GL_FPS
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# include <QElapsedTimer>
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#endif
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QT_CHARTS_BEGIN_NAMESPACE
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GLWidget::GLWidget(GLXYSeriesDataManager *xyDataManager, QWidget *parent)
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: QOpenGLWidget(parent),
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m_program(0),
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m_shaderAttribLoc(-1),
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m_colorUniformLoc(-1),
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m_minUniformLoc(-1),
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m_deltaUniformLoc(-1),
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m_pointSizeUniformLoc(-1),
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m_xyDataManager(xyDataManager)
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{
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setAttribute(Qt::WA_TranslucentBackground);
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setAttribute(Qt::WA_AlwaysStackOnTop);
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setAttribute(Qt::WA_TransparentForMouseEvents);
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QSurfaceFormat surfaceFormat;
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surfaceFormat.setDepthBufferSize(0);
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surfaceFormat.setStencilBufferSize(0);
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surfaceFormat.setRedBufferSize(8);
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surfaceFormat.setGreenBufferSize(8);
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surfaceFormat.setBlueBufferSize(8);
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surfaceFormat.setAlphaBufferSize(8);
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surfaceFormat.setSwapBehavior(QSurfaceFormat::DoubleBuffer);
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surfaceFormat.setRenderableType(QSurfaceFormat::DefaultRenderableType);
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setFormat(surfaceFormat);
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connect(xyDataManager, &GLXYSeriesDataManager::seriesRemoved,
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this, &GLWidget::cleanXYSeriesResources);
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}
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GLWidget::~GLWidget()
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{
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cleanup();
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}
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void GLWidget::cleanup()
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{
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makeCurrent();
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delete m_program;
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m_program = 0;
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foreach (QOpenGLBuffer *buffer, m_seriesBufferMap.values())
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delete buffer;
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m_seriesBufferMap.clear();
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doneCurrent();
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}
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void GLWidget::cleanXYSeriesResources(const QXYSeries *series)
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{
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makeCurrent();
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if (series) {
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delete m_seriesBufferMap.take(series);
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} else {
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// Null series means all series were removed
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foreach (QOpenGLBuffer *buffer, m_seriesBufferMap.values())
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delete buffer;
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m_seriesBufferMap.clear();
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}
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doneCurrent();
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}
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static const char *vertexSource =
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"attribute highp vec2 points;\n"
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"uniform highp vec2 min;\n"
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"uniform highp vec2 delta;\n"
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"uniform highp float pointSize;\n"
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"void main() {\n"
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" vec2 normalPoint = vec2(-1, -1) + ((points - min) / delta);\n"
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" gl_Position = vec4(normalPoint, 0, 1);\n"
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" gl_PointSize = pointSize;\n"
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"}";
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static const char *fragmentSource =
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"uniform highp vec3 color;\n"
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"void main() {\n"
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" gl_FragColor = vec4(color,1);\n"
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"}\n";
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void GLWidget::initializeGL()
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{
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connect(context(), &QOpenGLContext::aboutToBeDestroyed, this, &GLWidget::cleanup);
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initializeOpenGLFunctions();
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glClearColor(0, 0, 0, 0);
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m_program = new QOpenGLShaderProgram;
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m_program->addShaderFromSourceCode(QOpenGLShader::Vertex, vertexSource);
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m_program->addShaderFromSourceCode(QOpenGLShader::Fragment, fragmentSource);
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m_program->bindAttributeLocation("points", 0);
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m_program->link();
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m_program->bind();
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m_colorUniformLoc = m_program->uniformLocation("color");
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m_minUniformLoc = m_program->uniformLocation("min");
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m_deltaUniformLoc = m_program->uniformLocation("delta");
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m_pointSizeUniformLoc = m_program->uniformLocation("pointSize");
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// Create a vertex array object. In OpenGL ES 2.0 and OpenGL 2.x
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// implementations this is optional and support may not be present
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// at all. Nonetheless the below code works in all cases and makes
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// sure there is a VAO when one is needed.
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m_vao.create();
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QOpenGLVertexArrayObject::Binder vaoBinder(&m_vao);
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glEnableVertexAttribArray(0);
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glDisable(GL_DEPTH_TEST);
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glDisable(GL_STENCIL_TEST);
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#if !defined(QT_OPENGL_ES_2)
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if (!QOpenGLContext::currentContext()->isOpenGLES()) {
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// Make it possible to change point primitive size and use textures with them in
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// the shaders. These are implicitly enabled in ES2.
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glEnable(GL_PROGRAM_POINT_SIZE);
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}
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#endif
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m_program->release();
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}
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void GLWidget::paintGL()
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{
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glClear(GL_COLOR_BUFFER_BIT);
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QOpenGLVertexArrayObject::Binder vaoBinder(&m_vao);
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m_program->bind();
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GLXYDataMapIterator i(m_xyDataManager->dataMap());
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while (i.hasNext()) {
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i.next();
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QOpenGLBuffer *vbo = m_seriesBufferMap.value(i.key());
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GLXYSeriesData *data = i.value();
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m_program->setUniformValue(m_colorUniformLoc, data->color);
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m_program->setUniformValue(m_minUniformLoc, data->min);
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m_program->setUniformValue(m_deltaUniformLoc, data->delta);
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if (!vbo) {
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vbo = new QOpenGLBuffer;
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m_seriesBufferMap.insert(i.key(), vbo);
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vbo->create();
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}
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vbo->bind();
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if (data->dirty) {
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vbo->allocate(data->array.constData(), data->array.count() * sizeof(GLfloat));
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data->dirty = false;
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}
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glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, 0);
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if (data->type == QAbstractSeries::SeriesTypeLine) {
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glLineWidth(data->width);
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glDrawArrays(GL_LINE_STRIP, 0, data->array.size() / 2);
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} else { // Scatter
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m_program->setUniformValue(m_pointSizeUniformLoc, data->width);
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glDrawArrays(GL_POINTS, 0, data->array.size() / 2);
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}
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vbo->release();
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}
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#ifdef QDEBUG_TRACE_GL_FPS
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static QElapsedTimer stopWatch;
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static int frameCount = -1;
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if (frameCount == -1) {
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stopWatch.start();
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frameCount = 0;
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}
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frameCount++;
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int elapsed = stopWatch.elapsed();
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if (elapsed >= 1000) {
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elapsed = stopWatch.restart();
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qreal fps = qreal(0.1 * int(10000.0 * (qreal(frameCount) / qreal(elapsed))));
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qDebug() << "FPS:" << fps;
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frameCount = 0;
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}
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#endif
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m_program->release();
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}
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void GLWidget::resizeGL(int w, int h)
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{
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Q_UNUSED(w)
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Q_UNUSED(h)
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}
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QT_CHARTS_END_NAMESPACE
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#endif
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