| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the Qt Data Visualization module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:GPL$ |
| ** 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. |
| ** |
| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU |
| ** General Public License version 3 or (at your option) any later version |
| ** approved by the KDE Free Qt Foundation. The licenses are as published by |
| ** the Free Software Foundation and appearing in the file LICENSE.GPL3 |
| ** included in the packaging of this file. Please review the following |
| ** information to ensure the GNU General Public License requirements will |
| ** be met: https://www.gnu.org/licenses/gpl-3.0.html. |
| ** |
| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #include "scatterpointbufferhelper_p.h" |
| #include <QtGui/QVector2D> |
| |
| QT_BEGIN_NAMESPACE_DATAVISUALIZATION |
| |
| const QVector3D hiddenPos(-1000.0f, -1000.0f, -1000.0f); |
| |
| ScatterPointBufferHelper::ScatterPointBufferHelper() |
| : m_pointbuffer(0), |
| m_oldRemoveIndex(-1) |
| { |
| } |
| |
| ScatterPointBufferHelper::~ScatterPointBufferHelper() |
| { |
| if (QOpenGLContext::currentContext()) |
| glDeleteBuffers(1, &m_pointbuffer); |
| } |
| |
| GLuint ScatterPointBufferHelper::pointBuf() |
| { |
| if (!m_meshDataLoaded) |
| qFatal("No loaded object"); |
| return m_pointbuffer; |
| } |
| |
| void ScatterPointBufferHelper::pushPoint(uint pointIndex) |
| { |
| glBindBuffer(GL_ARRAY_BUFFER, m_pointbuffer); |
| |
| // Pop the previous point if it is still pushed |
| if (m_oldRemoveIndex >= 0) { |
| glBufferSubData(GL_ARRAY_BUFFER, m_oldRemoveIndex * sizeof(QVector3D), |
| sizeof(QVector3D), &m_bufferedPoints.at(m_oldRemoveIndex)); |
| } |
| |
| glBufferSubData(GL_ARRAY_BUFFER, pointIndex * sizeof(QVector3D), |
| sizeof(QVector3D), |
| &hiddenPos); |
| |
| glBindBuffer(GL_ARRAY_BUFFER, 0); |
| |
| m_oldRemoveIndex = pointIndex; |
| } |
| |
| void ScatterPointBufferHelper::popPoint() |
| { |
| if (m_oldRemoveIndex >= 0) { |
| glBindBuffer(GL_ARRAY_BUFFER, m_pointbuffer); |
| glBufferSubData(GL_ARRAY_BUFFER, m_oldRemoveIndex * sizeof(QVector3D), |
| sizeof(QVector3D), &m_bufferedPoints.at(m_oldRemoveIndex)); |
| glBindBuffer(GL_ARRAY_BUFFER, 0); |
| } |
| |
| m_oldRemoveIndex = -1; |
| } |
| |
| void ScatterPointBufferHelper::load(ScatterSeriesRenderCache *cache) |
| { |
| ScatterRenderItemArray &renderArray = cache->renderArray(); |
| const int renderArraySize = renderArray.size(); |
| m_indexCount = 0; |
| |
| if (m_meshDataLoaded) { |
| // Delete old data |
| glDeleteBuffers(1, &m_pointbuffer); |
| glDeleteBuffers(1, &m_uvbuffer); |
| m_bufferedPoints.clear(); |
| m_pointbuffer = 0; |
| m_uvbuffer = 0; |
| } |
| |
| bool itemsVisible = false; |
| m_bufferedPoints.resize(renderArraySize); |
| for (int i = 0; i < renderArraySize; i++) { |
| const ScatterRenderItem &item = renderArray.at(i); |
| if (!item.isVisible()) { |
| m_bufferedPoints[i] = hiddenPos; |
| } else { |
| itemsVisible = true; |
| m_bufferedPoints[i] = item.translation(); |
| } |
| } |
| |
| QVector<QVector2D> buffered_uvs; |
| if (itemsVisible) |
| m_indexCount = renderArraySize; |
| |
| if (m_indexCount > 0) { |
| if (cache->colorStyle() == Q3DTheme::ColorStyleRangeGradient) |
| createRangeGradientUVs(cache, buffered_uvs); |
| |
| glGenBuffers(1, &m_pointbuffer); |
| glBindBuffer(GL_ARRAY_BUFFER, m_pointbuffer); |
| glBufferData(GL_ARRAY_BUFFER, m_bufferedPoints.size() * sizeof(QVector3D), |
| &m_bufferedPoints.at(0), |
| GL_DYNAMIC_DRAW); |
| |
| if (buffered_uvs.size()) { |
| glGenBuffers(1, &m_uvbuffer); |
| glBindBuffer(GL_ARRAY_BUFFER, m_uvbuffer); |
| glBufferData(GL_ARRAY_BUFFER, buffered_uvs.size() * sizeof(QVector2D), |
| &buffered_uvs.at(0), GL_STATIC_DRAW); |
| } |
| |
| glBindBuffer(GL_ARRAY_BUFFER, 0); |
| |
| m_meshDataLoaded = true; |
| } |
| } |
| |
| void ScatterPointBufferHelper::update(ScatterSeriesRenderCache *cache) |
| { |
| // It may be that the buffer hasn't yet been initialized, in case the entire series was |
| // hidden items. No need to update in that case. |
| if (m_indexCount > 0) { |
| const ScatterRenderItemArray &renderArray = cache->renderArray(); |
| const int updateSize = cache->updateIndices().size(); |
| |
| glBindBuffer(GL_ARRAY_BUFFER, m_pointbuffer); |
| for (int i = 0; i < updateSize; i++) { |
| int index = cache->updateIndices().at(i); |
| const ScatterRenderItem &item = renderArray.at(index); |
| if (!item.isVisible()) |
| m_bufferedPoints[index] = hiddenPos; |
| else |
| m_bufferedPoints[index] = item.translation(); |
| |
| if (index != m_oldRemoveIndex) { |
| glBufferSubData(GL_ARRAY_BUFFER, index * sizeof(QVector3D), |
| sizeof(QVector3D), &m_bufferedPoints.at(index)); |
| } |
| } |
| glBindBuffer(GL_ARRAY_BUFFER, 0); |
| } |
| } |
| |
| void ScatterPointBufferHelper::updateUVs(ScatterSeriesRenderCache *cache) |
| { |
| // It may be that the buffer hasn't yet been initialized, in case the entire series was |
| // hidden items. No need to update in that case. |
| if (m_indexCount > 0) { |
| QVector<QVector2D> buffered_uvs; |
| createRangeGradientUVs(cache, buffered_uvs); |
| |
| if (buffered_uvs.size()) { |
| if (!m_uvbuffer) |
| glGenBuffers(1, &m_uvbuffer); |
| |
| int updateSize = cache->updateIndices().size(); |
| glBindBuffer(GL_ARRAY_BUFFER, m_uvbuffer); |
| if (updateSize) { |
| for (int i = 0; i < updateSize; i++) { |
| int index = cache->updateIndices().at(i); |
| glBufferSubData(GL_ARRAY_BUFFER, index * sizeof(QVector2D), |
| sizeof(QVector2D), &buffered_uvs.at(i)); |
| |
| } |
| } else { |
| glBufferData(GL_ARRAY_BUFFER, buffered_uvs.size() * sizeof(QVector2D), |
| &buffered_uvs.at(0), GL_STATIC_DRAW); |
| } |
| |
| glBindBuffer(GL_ARRAY_BUFFER, 0); |
| } |
| } |
| } |
| |
| void ScatterPointBufferHelper::createRangeGradientUVs(ScatterSeriesRenderCache *cache, |
| QVector<QVector2D> &buffered_uvs) |
| { |
| const ScatterRenderItemArray &renderArray = cache->renderArray(); |
| const bool updateAll = (cache->updateIndices().size() == 0); |
| const int updateSize = updateAll ? renderArray.size() : cache->updateIndices().size(); |
| buffered_uvs.resize(updateSize); |
| |
| QVector2D uv; |
| uv.setX(0.0f); |
| for (int i = 0; i < updateSize; i++) { |
| int index = updateAll ? i : cache->updateIndices().at(i); |
| const ScatterRenderItem &item = renderArray.at(index); |
| |
| float y = ((item.translation().y() + m_scaleY) * 0.5f) / m_scaleY; |
| uv.setY(y); |
| buffered_uvs[i] = uv; |
| } |
| } |
| |
| QT_END_NAMESPACE_DATAVISUALIZATION |