|
|
/****************************************************************************
|
|
|
**
|
|
|
** Copyright (C) 2015 The Qt Company Ltd
|
|
|
** All rights reserved.
|
|
|
** For any questions to The Qt Company, please use contact form at http://qt.io
|
|
|
**
|
|
|
** This file is part of the Qt Charts module.
|
|
|
**
|
|
|
** Licensees holding valid commercial license for Qt may use this file in
|
|
|
** accordance with the Qt License Agreement provided with the Software
|
|
|
** or, alternatively, in accordance with the terms contained in a written
|
|
|
** agreement between you and The Qt Company.
|
|
|
**
|
|
|
** If you have questions regarding the use of this file, please use
|
|
|
** contact form at http://qt.io
|
|
|
**
|
|
|
****************************************************************************/
|
|
|
|
|
|
#include "declarativerendernode.h"
|
|
|
|
|
|
#include <QtGui/QOpenGLContext>
|
|
|
#include <QtGui/QOpenGLFunctions>
|
|
|
#include <QtGui/QOpenGLFramebufferObjectFormat>
|
|
|
#include <QtGui/QOpenGLFramebufferObject>
|
|
|
#include <QOpenGLShaderProgram>
|
|
|
#include <QtGui/QOpenGLBuffer>
|
|
|
|
|
|
//#define QDEBUG_TRACE_GL_FPS
|
|
|
#ifdef QDEBUG_TRACE_GL_FPS
|
|
|
# include <QElapsedTimer>
|
|
|
#endif
|
|
|
|
|
|
QT_CHARTS_BEGIN_NAMESPACE
|
|
|
|
|
|
// This node draws the xy series data on a transparent background using OpenGL.
|
|
|
// It is used as a child node of the chart node.
|
|
|
DeclarativeRenderNode::DeclarativeRenderNode(QQuickWindow *window) :
|
|
|
QObject(),
|
|
|
QSGSimpleTextureNode(),
|
|
|
m_texture(0),
|
|
|
m_window(window),
|
|
|
m_textureOptions(QQuickWindow::TextureHasAlphaChannel),
|
|
|
m_textureSize(1, 1),
|
|
|
m_recreateFbo(false),
|
|
|
m_fbo(0),
|
|
|
m_program(0),
|
|
|
m_shaderAttribLoc(-1),
|
|
|
m_colorUniformLoc(-1),
|
|
|
m_minUniformLoc(-1),
|
|
|
m_deltaUniformLoc(-1),
|
|
|
m_pointSizeUniformLoc(-1),
|
|
|
m_renderNeeded(true)
|
|
|
{
|
|
|
initializeOpenGLFunctions();
|
|
|
|
|
|
// Our texture node must have a texture, so use a default one pixel texture
|
|
|
GLuint defaultTexture = 0;
|
|
|
glGenTextures(1, &defaultTexture);
|
|
|
glBindTexture(GL_TEXTURE_2D, defaultTexture);
|
|
|
uchar buf[4] = { 0, 0, 0, 0 };
|
|
|
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, &buf);
|
|
|
|
|
|
QQuickWindow::CreateTextureOptions defaultTextureOptions = QQuickWindow::CreateTextureOptions(
|
|
|
QQuickWindow::TextureHasAlphaChannel | QQuickWindow::TextureOwnsGLTexture);
|
|
|
m_texture = m_window->createTextureFromId(defaultTexture, QSize(1, 1), defaultTextureOptions);
|
|
|
|
|
|
setTexture(m_texture);
|
|
|
setFiltering(QSGTexture::Linear);
|
|
|
setTextureCoordinatesTransform(QSGSimpleTextureNode::MirrorVertically);
|
|
|
}
|
|
|
|
|
|
DeclarativeRenderNode::~DeclarativeRenderNode()
|
|
|
{
|
|
|
delete m_texture;
|
|
|
delete m_fbo;
|
|
|
|
|
|
delete m_program;
|
|
|
m_program = 0;
|
|
|
|
|
|
cleanXYSeriesResources(0);
|
|
|
}
|
|
|
|
|
|
static const char *vertexSource =
|
|
|
"attribute highp vec2 points;\n"
|
|
|
"uniform highp vec2 min;\n"
|
|
|
"uniform highp vec2 delta;\n"
|
|
|
"uniform highp float pointSize;\n"
|
|
|
"void main() {\n"
|
|
|
" vec2 normalPoint = vec2(-1, -1) + ((points - min) / delta);\n"
|
|
|
" gl_Position = vec4(normalPoint, 0, 1);\n"
|
|
|
" gl_PointSize = pointSize;\n"
|
|
|
"}";
|
|
|
static const char *fragmentSource =
|
|
|
"uniform highp vec3 color;\n"
|
|
|
"void main() {\n"
|
|
|
" gl_FragColor = vec4(color,1);\n"
|
|
|
"}\n";
|
|
|
|
|
|
// Must be called on render thread and in context
|
|
|
void DeclarativeRenderNode::initGL()
|
|
|
{
|
|
|
recreateFBO();
|
|
|
|
|
|
m_program = new QOpenGLShaderProgram;
|
|
|
m_program->addShaderFromSourceCode(QOpenGLShader::Vertex, vertexSource);
|
|
|
m_program->addShaderFromSourceCode(QOpenGLShader::Fragment, fragmentSource);
|
|
|
m_program->bindAttributeLocation("points", 0);
|
|
|
m_program->link();
|
|
|
|
|
|
m_program->bind();
|
|
|
m_colorUniformLoc = m_program->uniformLocation("color");
|
|
|
m_minUniformLoc = m_program->uniformLocation("min");
|
|
|
m_deltaUniformLoc = m_program->uniformLocation("delta");
|
|
|
m_pointSizeUniformLoc = m_program->uniformLocation("pointSize");
|
|
|
|
|
|
// Create a vertex array object. In OpenGL ES 2.0 and OpenGL 2.x
|
|
|
// implementations this is optional and support may not be present
|
|
|
// at all. Nonetheless the below code works in all cases and makes
|
|
|
// sure there is a VAO when one is needed.
|
|
|
m_vao.create();
|
|
|
QOpenGLVertexArrayObject::Binder vaoBinder(&m_vao);
|
|
|
|
|
|
#if !defined(QT_OPENGL_ES_2)
|
|
|
if (!QOpenGLContext::currentContext()->isOpenGLES()) {
|
|
|
// Make it possible to change point primitive size and use textures with them in
|
|
|
// the shaders. These are implicitly enabled in ES2.
|
|
|
// Qt Quick doesn't change these flags, so it should be safe to just enable them
|
|
|
// at initialization.
|
|
|
glEnable(GL_PROGRAM_POINT_SIZE);
|
|
|
}
|
|
|
#endif
|
|
|
|
|
|
m_program->release();
|
|
|
}
|
|
|
|
|
|
void DeclarativeRenderNode::recreateFBO()
|
|
|
{
|
|
|
QOpenGLFramebufferObjectFormat fboFormat;
|
|
|
fboFormat.setAttachment(QOpenGLFramebufferObject::NoAttachment);
|
|
|
delete m_fbo;
|
|
|
m_fbo = new QOpenGLFramebufferObject(m_textureSize.width(),
|
|
|
m_textureSize.height(),
|
|
|
fboFormat);
|
|
|
|
|
|
delete m_texture;
|
|
|
m_texture = m_window->createTextureFromId(m_fbo->texture(), m_textureSize, m_textureOptions);
|
|
|
setTexture(m_texture);
|
|
|
|
|
|
m_recreateFbo = false;
|
|
|
}
|
|
|
|
|
|
// Must be called on render thread and in context
|
|
|
void DeclarativeRenderNode::setTextureSize(const QSize &size)
|
|
|
{
|
|
|
m_textureSize = size;
|
|
|
m_recreateFbo = true;
|
|
|
m_renderNeeded = true;
|
|
|
}
|
|
|
|
|
|
// Must be called on render thread while gui thread is blocked, and in context
|
|
|
void DeclarativeRenderNode::setSeriesData(bool mapDirty, const GLXYDataMap &dataMap)
|
|
|
{
|
|
|
if (mapDirty) {
|
|
|
// Series have changed, recreate map, but utilize old data where feasible
|
|
|
GLXYDataMap oldMap = m_xyDataMap;
|
|
|
m_xyDataMap.clear();
|
|
|
|
|
|
GLXYDataMapIterator i(dataMap);
|
|
|
while (i.hasNext()) {
|
|
|
i.next();
|
|
|
GLXYSeriesData *data = oldMap.take(i.key());
|
|
|
const GLXYSeriesData *newData = i.value();
|
|
|
if (!data || newData->dirty) {
|
|
|
data = new GLXYSeriesData;
|
|
|
data->array = newData->array;
|
|
|
data->color = newData->color;
|
|
|
data->dirty = newData->dirty;
|
|
|
data->width = newData->width;
|
|
|
data->type = newData->type;
|
|
|
data->min = newData->min;
|
|
|
data->delta = newData->delta;
|
|
|
}
|
|
|
m_xyDataMap.insert(i.key(), data);
|
|
|
}
|
|
|
// Delete remaining old data
|
|
|
i = oldMap;
|
|
|
while (i.hasNext()) {
|
|
|
i.next();
|
|
|
delete i.value();
|
|
|
cleanXYSeriesResources(i.key());
|
|
|
}
|
|
|
} else {
|
|
|
// Series have not changed, so just copy dirty data over
|
|
|
GLXYDataMapIterator i(dataMap);
|
|
|
while (i.hasNext()) {
|
|
|
i.next();
|
|
|
const GLXYSeriesData *newData = i.value();
|
|
|
if (i.value()->dirty) {
|
|
|
GLXYSeriesData *data = m_xyDataMap.value(i.key());
|
|
|
if (data) {
|
|
|
data->array = newData->array;
|
|
|
data->color = newData->color;
|
|
|
data->dirty = newData->dirty;
|
|
|
data->width = newData->width;
|
|
|
data->type = newData->type;
|
|
|
data->min = newData->min;
|
|
|
data->delta = newData->delta;
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
markDirty(DirtyMaterial);
|
|
|
m_renderNeeded = true;
|
|
|
}
|
|
|
|
|
|
void DeclarativeRenderNode::renderGL()
|
|
|
{
|
|
|
glClearColor(0, 0, 0, 0);
|
|
|
|
|
|
QOpenGLVertexArrayObject::Binder vaoBinder(&m_vao);
|
|
|
m_program->bind();
|
|
|
m_fbo->bind();
|
|
|
|
|
|
glClear(GL_COLOR_BUFFER_BIT);
|
|
|
glEnableVertexAttribArray(0);
|
|
|
|
|
|
glViewport(0, 0, m_textureSize.width(), m_textureSize.height());
|
|
|
|
|
|
GLXYDataMapIterator i(m_xyDataMap);
|
|
|
while (i.hasNext()) {
|
|
|
i.next();
|
|
|
QOpenGLBuffer *vbo = m_seriesBufferMap.value(i.key());
|
|
|
GLXYSeriesData *data = i.value();
|
|
|
|
|
|
m_program->setUniformValue(m_colorUniformLoc, data->color);
|
|
|
m_program->setUniformValue(m_minUniformLoc, data->min);
|
|
|
m_program->setUniformValue(m_deltaUniformLoc, data->delta);
|
|
|
|
|
|
if (!vbo) {
|
|
|
vbo = new QOpenGLBuffer;
|
|
|
m_seriesBufferMap.insert(i.key(), vbo);
|
|
|
vbo->create();
|
|
|
}
|
|
|
vbo->bind();
|
|
|
if (data->dirty) {
|
|
|
vbo->allocate(data->array.constData(), data->array.count() * sizeof(GLfloat));
|
|
|
data->dirty = false;
|
|
|
}
|
|
|
|
|
|
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, 0);
|
|
|
if (data->type == QAbstractSeries::SeriesTypeLine) {
|
|
|
glLineWidth(data->width);
|
|
|
glDrawArrays(GL_LINE_STRIP, 0, data->array.size() / 2);
|
|
|
} else { // Scatter
|
|
|
m_program->setUniformValue(m_pointSizeUniformLoc, data->width);
|
|
|
glDrawArrays(GL_POINTS, 0, data->array.size() / 2);
|
|
|
}
|
|
|
vbo->release();
|
|
|
}
|
|
|
|
|
|
#ifdef QDEBUG_TRACE_GL_FPS
|
|
|
static QElapsedTimer stopWatch;
|
|
|
static int frameCount = -1;
|
|
|
if (frameCount == -1) {
|
|
|
stopWatch.start();
|
|
|
frameCount = 0;
|
|
|
}
|
|
|
frameCount++;
|
|
|
int elapsed = stopWatch.elapsed();
|
|
|
if (elapsed >= 1000) {
|
|
|
elapsed = stopWatch.restart();
|
|
|
qreal fps = qreal(0.1 * int(10000.0 * (qreal(frameCount) / qreal(elapsed))));
|
|
|
qDebug() << "FPS:" << fps;
|
|
|
frameCount = 0;
|
|
|
}
|
|
|
#endif
|
|
|
|
|
|
markDirty(DirtyMaterial);
|
|
|
m_window->resetOpenGLState();
|
|
|
}
|
|
|
|
|
|
// Must be called on render thread as response to beforeRendering signal
|
|
|
void DeclarativeRenderNode::render()
|
|
|
{
|
|
|
if (m_renderNeeded) {
|
|
|
if (m_xyDataMap.size()) {
|
|
|
if (!m_program)
|
|
|
initGL();
|
|
|
if (m_recreateFbo)
|
|
|
recreateFBO();
|
|
|
renderGL();
|
|
|
} else {
|
|
|
if (rect() != QRectF()) {
|
|
|
glClearColor(0, 0, 0, 0);
|
|
|
m_fbo->bind();
|
|
|
glClear(GL_COLOR_BUFFER_BIT);
|
|
|
|
|
|
// If last series was removed, zero out the node rect
|
|
|
setRect(QRectF());
|
|
|
}
|
|
|
}
|
|
|
m_renderNeeded = false;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
void DeclarativeRenderNode::cleanXYSeriesResources(const QXYSeries *series)
|
|
|
{
|
|
|
if (series) {
|
|
|
delete m_seriesBufferMap.take(series);
|
|
|
} else {
|
|
|
foreach (QOpenGLBuffer *buffer, m_seriesBufferMap.values())
|
|
|
delete buffer;
|
|
|
m_seriesBufferMap.clear();
|
|
|
}
|
|
|
}
|
|
|
|
|
|
QT_CHARTS_END_NAMESPACE
|
|
|
|
