From 9a40207d83b66072fff4aaa03eca15b02f8a11c1 Mon Sep 17 00:00:00 2001
From: Mika Salmela <mika.salmela@digia.com>
Date: Thu, 28 Aug 2014 10:29:39 +0300
Subject: Range gradient for points on static optimization

Change-Id: Ic44a6a28617f272540d146f02bf50b4bd84cd9c8
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@digia.com>
---
 .../utils/scatterobjectbufferhelper.cpp            |  2 +-
 .../utils/scatterpointbufferhelper.cpp             | 50 ++++++++++++++++++++++
 .../utils/scatterpointbufferhelper_p.h             |  7 +++
 3 files changed, 58 insertions(+), 1 deletion(-)

(limited to 'src/datavisualization/utils')

diff --git a/src/datavisualization/utils/scatterobjectbufferhelper.cpp b/src/datavisualization/utils/scatterobjectbufferhelper.cpp
index 9ecdffdd..5e98363e 100644
--- a/src/datavisualization/utils/scatterobjectbufferhelper.cpp
+++ b/src/datavisualization/utils/scatterobjectbufferhelper.cpp
@@ -220,7 +220,7 @@ uint ScatterObjectBufferHelper::createRangeGradientUVs(ScatterSeriesRenderCache
         if (!item.isVisible())
             continue;
 
-        float y = ((item.translation().y() + m_scaleY) * 0.5f ) / m_scaleY;
+        float y = ((item.translation().y() + m_scaleY) * 0.5f) / m_scaleY;
         uv.setY(y);
         int offset = pos * uvsCount;
         for (int j = 0; j < uvsCount; j++)
diff --git a/src/datavisualization/utils/scatterpointbufferhelper.cpp b/src/datavisualization/utils/scatterpointbufferhelper.cpp
index b14d84ad..2ddee31c 100644
--- a/src/datavisualization/utils/scatterpointbufferhelper.cpp
+++ b/src/datavisualization/utils/scatterpointbufferhelper.cpp
@@ -17,6 +17,7 @@
 ****************************************************************************/
 
 #include "scatterpointbufferhelper_p.h"
+#include <QtGui/QVector2D>
 
 QT_BEGIN_NAMESPACE_DATAVISUALIZATION
 
@@ -86,9 +87,14 @@ void ScatterPointBufferHelper::load(ScatterSeriesRenderCache *cache)
     if (m_meshDataLoaded) {
         // Delete old data
         glDeleteBuffers(1, &m_pointbuffer);
+        glDeleteBuffers(1, &m_uvbuffer);
         m_bufferedPoints.clear();
     }
 
+    QVector<QVector2D> buffered_uvs;
+    if (cache->colorStyle() == Q3DTheme::ColorStyleRangeGradient)
+        createRangeGradientUVs(cache, buffered_uvs);
+
     bool itemsVisible = false;
     m_bufferedPoints.resize(renderArraySize);
     for (int i = 0; i < renderArraySize; i++) {
@@ -110,10 +116,54 @@ void ScatterPointBufferHelper::load(ScatterSeriesRenderCache *cache)
         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::updateUVs(ScatterSeriesRenderCache *cache)
+{
+    QVector<QVector2D> buffered_uvs;
+
+    createRangeGradientUVs(cache, buffered_uvs);
+
+    if (buffered_uvs.size()) {
+        if (!m_uvbuffer)
+            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);
+    }
+}
+
+void ScatterPointBufferHelper::createRangeGradientUVs(ScatterSeriesRenderCache *cache,
+                                                      QVector<QVector2D> &buffered_uvs)
+{
+    const ScatterRenderItemArray &renderArray = cache->renderArray();
+    const uint renderArraySize = renderArray.size();
+    buffered_uvs.resize(renderArraySize);
+
+    QVector2D uv;
+    uv.setX(0.0f);
+    for (uint i = 0; i < renderArraySize; i++) {
+        const ScatterRenderItem &item = renderArray.at(i);
+
+        float y = ((item.translation().y() + m_scaleY) * 0.5f) / m_scaleY;
+        uv.setY(y);
+        buffered_uvs[i] = uv;
+    }
+}
+
 QT_END_NAMESPACE_DATAVISUALIZATION
diff --git a/src/datavisualization/utils/scatterpointbufferhelper_p.h b/src/datavisualization/utils/scatterpointbufferhelper_p.h
index d09ce0f7..3edc4c8f 100644
--- a/src/datavisualization/utils/scatterpointbufferhelper_p.h
+++ b/src/datavisualization/utils/scatterpointbufferhelper_p.h
@@ -46,14 +46,21 @@ public:
     void pushPoint(uint pointIndex);
     void popPoint();
     void load(ScatterSeriesRenderCache *cache);
+    void setScaleY(float scale) { m_scaleY = scale; }
+    void updateUVs(ScatterSeriesRenderCache *cache);
 
 public:
     GLuint m_pointbuffer;
 
+private:
+    void createRangeGradientUVs(ScatterSeriesRenderCache *cache,
+                                QVector<QVector2D> &buffered_uvs);
+
 private:
     QVector<QVector3D> m_bufferedPoints;
     uint m_oldRemoveIndex;
     bool m_oldRemove;
+    float m_scaleY;
 };
 
 QT_END_NAMESPACE_DATAVISUALIZATION
-- 
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