From 2299481acb0b36d76414ed9e0ae2b2d110ff13d8 Mon Sep 17 00:00:00 2001
From: Mika Salmela <mika.salmela@digia.com>
Date: Thu, 5 Jun 2014 10:32:24 +0300
Subject: Scatter perf improvement
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Task-number: QTRD-3148
Change-Id: I2c9efa84184819aaac123ee29685bc3a9e35bfe6
Reviewed-by: Tomi Korpipää <tomi.korpipaa@digia.com>
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@digia.com>
---
 .../utils/scatterpointbufferhelper.cpp             | 113 +++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 src/datavisualization/utils/scatterpointbufferhelper.cpp

(limited to 'src/datavisualization/utils/scatterpointbufferhelper.cpp')

diff --git a/src/datavisualization/utils/scatterpointbufferhelper.cpp b/src/datavisualization/utils/scatterpointbufferhelper.cpp
new file mode 100644
index 00000000..0f290aeb
--- /dev/null
+++ b/src/datavisualization/utils/scatterpointbufferhelper.cpp
@@ -0,0 +1,113 @@
+/****************************************************************************
+**
+** 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 "scatterpointbufferhelper_p.h"
+
+QT_BEGIN_NAMESPACE_DATAVISUALIZATION
+
+const GLfloat itemScaler = 3.0f;
+const QVector3D hiddenPos(-1000.0f, -1000.0f, -1000.0f);
+
+ScatterPointBufferHelper::ScatterPointBufferHelper()
+    : m_pointbuffer(0),
+      m_oldRemoveIndex(0),
+      m_oldRemove(false)
+{
+    m_indicesType = GL_UNSIGNED_INT;
+}
+
+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);
+
+    if (m_oldRemove && m_oldRemoveIndex < pointIndex) {
+        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;
+    m_oldRemove = true;
+}
+
+void ScatterPointBufferHelper::popPoint()
+{
+    if (m_oldRemove) {
+        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 = 0;
+    m_oldRemove = false;
+}
+
+void ScatterPointBufferHelper::load(ScatterSeriesRenderCache *cache)
+{
+    initializeOpenGLFunctions();
+
+    ScatterRenderItemArray &renderArray = cache->renderArray();
+    const int renderArraySize = renderArray.size();
+
+    if (m_meshDataLoaded) {
+        // Delete old data
+        glDeleteBuffers(1, &m_pointbuffer);
+        m_bufferedPoints.clear();
+    }
+
+    m_bufferedPoints.resize(renderArraySize);
+    for (int i = 0; i < renderArraySize; i++) {
+        ScatterRenderItem &item = renderArray[i];
+        if (!item.isVisible())
+            m_bufferedPoints[i] = hiddenPos;
+        else
+            m_bufferedPoints[i] = item.translation();
+    }
+
+    m_indexCount = renderArraySize;
+
+    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);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+
+    m_meshDataLoaded = true;
+}
+
+QT_END_NAMESPACE_DATAVISUALIZATION
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