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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include "scatterpointbufferhelper_p.h"
#include <QtGui/QVector2D>
QT_BEGIN_NAMESPACE
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;
m_meshDataLoaded = false;
}
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();
}
}
QList<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) {
QList<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,
QList<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
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