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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc
** All rights reserved.
** For any questions to Digia, please use contact form at http://qt.digia.com
**
** This file is part of the QtDataVisualization module.
**
** Licensees holding valid Qt Enterprise licenses may use this file in
** accordance with the Qt Enterprise License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.
**
** If you have questions regarding the use of this file, please use
** contact form at http://qt.digia.com
**
****************************************************************************/
#include "scatterobjectbufferhelper_p.h"
#include "objecthelper_p.h"
#include <QtGui/QVector2D>
#include <QtGui/QMatrix4x4>
QT_BEGIN_NAMESPACE_DATAVISUALIZATION
const GLfloat itemScaler = 3.0f;
ScatterObjectBufferHelper::ScatterObjectBufferHelper()
{
m_indicesType = GL_UNSIGNED_INT;
}
ScatterObjectBufferHelper::~ScatterObjectBufferHelper()
{
}
void ScatterObjectBufferHelper::fullLoad(ScatterSeriesRenderCache *cache, qreal dotScale)
{
initializeOpenGLFunctions();
m_meshDataLoaded = false;
m_indexCount = 0;
ObjectHelper *dotObj = cache->object();
ScatterRenderItemArray &renderArray = cache->renderArray();
const uint renderArraySize = renderArray.size();
if (renderArraySize == 0)
return; // No use to go forward
uint itemCount = renderArraySize;
QQuaternion seriesRotation(cache->meshRotation());
if (m_meshDataLoaded) {
// Delete old data
glDeleteBuffers(1, &m_vertexbuffer);
glDeleteBuffers(1, &m_uvbuffer);
glDeleteBuffers(1, &m_normalbuffer);
glDeleteBuffers(1, &m_elementbuffer);
}
// Index vertices
const QVector<unsigned short> indices = dotObj->indices();
const QVector<QVector3D> indexed_vertices = dotObj->indexedvertices();
const QVector<QVector2D> indexed_uvs = dotObj->indexedUVs();
const QVector<QVector3D> indexed_normals = dotObj->indexedNormals();
int indicesCount = indices.count();
int verticeCount = indexed_vertices.count();
int uvsCount = indexed_uvs.count();
int normalsCount = indexed_normals.count();
float itemSize = cache->itemSize() / itemScaler;
if (itemSize == 0.0f)
itemSize = dotScale;
QVector3D modelScaler(itemSize, itemSize, itemSize);
QMatrix4x4 modelMatrix;
if (!seriesRotation.isIdentity()) {
QMatrix4x4 matrix;
matrix.rotate(seriesRotation);
modelMatrix = matrix.transposed();
}
modelMatrix.scale(modelScaler);
QVector<QVector3D> scaled_vertices;
scaled_vertices.resize(verticeCount);
for (int i = 0; i < verticeCount; i++)
scaled_vertices[i] = indexed_vertices[i] * modelMatrix;
QVector<GLuint> buffered_indices;
QVector<QVector3D> buffered_vertices;
QVector<QVector2D> buffered_uvs;
QVector<QVector3D> buffered_normals;
buffered_indices.resize(indicesCount * renderArraySize);
buffered_vertices.resize(verticeCount * renderArraySize);
buffered_uvs.resize(uvsCount * renderArraySize);
buffered_normals.resize(normalsCount * renderArraySize);
uint pos = 0;
for (uint i = 0; i < renderArraySize; i++) {
ScatterRenderItem &item = renderArray[i];
if (!item.isVisible()) {
itemCount--;
continue;
}
int offset = pos * verticeCount;
if (item.rotation().isIdentity()) {
for (int j = 0; j < verticeCount; j++)
buffered_vertices[j + offset] = scaled_vertices[j] + item.translation();
} else {
QMatrix4x4 matrix;
matrix.rotate(seriesRotation * item.rotation());
modelMatrix = matrix.transposed();
modelMatrix.scale(modelScaler);
for (int j = 0; j < verticeCount; j++)
buffered_vertices[j + offset] = indexed_vertices[j] * modelMatrix
+ item.translation();
}
offset = pos * normalsCount;
for (int j = 0; j < normalsCount; j++)
buffered_normals[j + offset] = indexed_normals[j];
offset = pos * uvsCount;
for (int j = 0; j < uvsCount; j++)
buffered_uvs[j + offset] = indexed_uvs[j];
int offsetVertice = i * verticeCount;
offset = pos * indicesCount;
for (int j = 0; j < indicesCount; j++) {
buffered_indices[j + offset] = GLuint(indices[j] + offsetVertice);
}
pos++;
}
m_indexCount = indicesCount * itemCount;
if (itemCount > 0) {
glGenBuffers(1, &m_vertexbuffer);
glBindBuffer(GL_ARRAY_BUFFER, m_vertexbuffer);
glBufferData(GL_ARRAY_BUFFER, verticeCount * itemCount * sizeof(QVector3D),
&buffered_vertices.at(0),
GL_STATIC_DRAW);
glGenBuffers(1, &m_normalbuffer);
glBindBuffer(GL_ARRAY_BUFFER, m_normalbuffer);
glBufferData(GL_ARRAY_BUFFER, normalsCount * itemCount * sizeof(QVector3D),
&buffered_normals.at(0),
GL_STATIC_DRAW);
glGenBuffers(1, &m_uvbuffer);
glBindBuffer(GL_ARRAY_BUFFER, m_uvbuffer);
glBufferData(GL_ARRAY_BUFFER, uvsCount * itemCount * sizeof(QVector2D),
&buffered_uvs.at(0), GL_STATIC_DRAW);
glGenBuffers(1, &m_elementbuffer);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_elementbuffer);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, indicesCount * itemCount * sizeof(GLint),
&buffered_indices.at(0), GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
m_meshDataLoaded = true;
}
}
void ScatterObjectBufferHelper::update(ScatterSeriesRenderCache *cache, qreal dotScale)
{
initializeOpenGLFunctions();
ObjectHelper *dotObj = cache->object();
ScatterRenderItemArray &renderArray = cache->renderArray();
const int renderArraySize = renderArray.size();
QQuaternion seriesRotation(cache->meshRotation());
// Index vertices
const QVector<QVector3D> indexed_vertices = dotObj->indexedvertices();
int verticeCount = indexed_vertices.count();
float itemSize = cache->itemSize() / itemScaler;
if (itemSize == 0.0f)
itemSize = dotScale;
QVector3D modelScaler(itemSize, itemSize, itemSize);
QMatrix4x4 modelMatrix;
if (!seriesRotation.isIdentity()) {
QMatrix4x4 matrix;
matrix.rotate(seriesRotation);
modelMatrix = matrix.transposed();
}
modelMatrix.scale(modelScaler);
QVector<QVector3D> scaled_vertices;
scaled_vertices.resize(verticeCount);
for (int i = 0; i < verticeCount; i++)
scaled_vertices[i] = indexed_vertices[i] * modelMatrix;
QVector<QVector3D> buffered_vertices;
buffered_vertices.resize(verticeCount * renderArraySize);
for (int i = 0; i < renderArraySize; i++) {
ScatterRenderItem &item = renderArray[i];
if (!item.isVisible())
continue;
const int offset = i * verticeCount;
if (item.rotation().isIdentity()) {
for (int j = 0; j < verticeCount; j++)
buffered_vertices[j + offset] = scaled_vertices[j] + item.translation();
} else {
QMatrix4x4 matrix;
matrix.rotate(seriesRotation * item.rotation());
modelMatrix = matrix.transposed();
modelMatrix.scale(modelScaler);
for (int j = 0; j < verticeCount; j++)
buffered_vertices[j + offset] = indexed_vertices[j] * modelMatrix
+ item.translation();
}
}
glBindBuffer(GL_ARRAY_BUFFER, m_vertexbuffer);
glBufferData(GL_ARRAY_BUFFER, buffered_vertices.size() * sizeof(QVector3D),
&buffered_vertices.at(0),
GL_DYNAMIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
m_meshDataLoaded = true;
}
QT_END_NAMESPACE_DATAVISUALIZATION
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