1 files changed, 204 insertions, 0 deletions
diff --git a/src/core/render/backend/renderbin.cpp b/src/core/render/backend/renderbin.cpp
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+++ b/src/core/render/backend/renderbin.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt3D module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "renderbin.h"
+
+#include "drawable.h"
+#include "qgraphicscontext.h"
+#include "rendershader.h"
+#include "drawstate.h"
+
+//#define QT3D_STATE_CHANGE_DEBUG
+
+namespace Qt3D
+{
+
+
+void OpaqueBin::sendDrawingCommands(QGraphicsContext *gc)
+{
+    int shaderChangeCount = 0,
+        stateSetChangeCount = 0,
+        batchSize = 0;
+    bool resetBatch = false;
+
+    RenderShader* sh = NULL;
+    DrawStateSet* ss = NULL;
+
+    foreach (Drawable* d, m_drawables) {
+        resetBatch = false;
+
+        if (sh != d->shader()) {
+            sh = d->shader();
+            gc->activateShader(sh);
+            ++shaderChangeCount;
+        #if defined(QT3D_STATE_CHANGE_DEBUG)
+            qDebug() << "did shader change to" << sh->name();
+        #endif
+            resetBatch = true;
+        }
+
+        if (ss != d->stateSet()) {
+            ss = d->stateSet();
+            gc->setCurrentStateSet(ss);
+            ++stateSetChangeCount;
+        #if defined(QT3D_STATE_CHANGE_DEBUG)
+            qDebug() << "did state change";
+        #endif
+            resetBatch = true;
+        }
+
+        if (resetBatch && (batchSize > 0)) {
+        #if defined(QT3D_STATE_CHANGE_DEBUG)
+            qDebug() << "previous batch was " << batchSize;
+        #endif
+            batchSize = 1;
+        } else {
+            ++batchSize;
+        }
+
+        d->sendDrawingCommands(gc);
+    }
+
+#if defined(QT3D_STATE_CHANGE_DEBUG)
+    qDebug() << "final batch:" << batchSize;
+#endif
+}
+
+void OpaqueBin::addDrawable(Drawable *dr)
+{
+    Q_CHECK_PTR(dr);
+    RenderShader* sh = dr->shader();
+    DrawStateSet* ss = dr->stateSet();
+
+    int shaderStartIndex = 0;
+    for (; shaderStartIndex <m_drawables.size(); ++ shaderStartIndex) {
+        if (m_drawables.at(shaderStartIndex)->shader() == sh) {
+            break;
+        }
+    }
+
+    if (shaderStartIndex >= m_drawables.size()) {
+        // no matching shader found, simply append
+        m_drawables.append(dr);
+        return;
+    }
+
+// find last drawable using the shader. Also check for a matching
+// DrawStateSet in case it exists (then we just insert beside)
+    int shaderEndIndex = shaderStartIndex;
+    QVector<DrawStateSet*> ssList;
+
+    for (; shaderEndIndex < m_drawables.size(); ++shaderEndIndex) {
+        if (m_drawables.at(shaderEndIndex)->shader() != sh)
+            break; // found first drawable with different shader
+
+        DrawStateSet* currentSS = m_drawables.at(shaderEndIndex)->stateSet();
+        // record each distinct state-set applicable to this shader.
+        if (ssList.empty() || ssList.back() != currentSS) {
+            ssList.append(currentSS);
+
+            // check cost delta is non-zero; if it is, the state-sets are
+            // equivalent and we can simply merge
+            if (ss->changeCost(currentSS) == 0) {
+                m_drawables.insert(shaderEndIndex, dr);
+                return;
+            }
+        }
+    } // of same-shader range-iteration
+
+    insertDrawableInRange(dr, shaderStartIndex, shaderEndIndex, ssList);
+}
+
+// select position in the (shaderStartIndex .. shaderEndIndex]
+// range based on lowest cost StateSet transition. We already know the state-sets
+// are distinct since we checked for changeCost() == 0 in the loop above
+
+void OpaqueBin::insertDrawableInRange(Drawable *dr,
+                                      int startIndex, int endIndex,
+                                      const QVector<DrawStateSet*> ssList)
+{
+    qDebug() << "inserting drawable with different state-set";
+
+// special case where there is only one existing state set
+    if (ssList.size() == 1) {
+        m_drawables.insert(endIndex, dr);
+        return;
+    }
+
+    DrawStateSet* ss = dr->stateSet();
+    DrawStateSet* prevSS = ssList.front();
+    // default to appending
+    int lowestCostIncrease = ss->changeCost(ssList.back());
+    DrawStateSet* insertBeforeSS = NULL;
+
+    // see if we can do better than appending
+    for (int i=1; i<ssList.size(); ++i) {
+        int oldCost = ssList.at(i)->changeCost(prevSS);
+        int newCost = ss->changeCost(prevSS) + ssList.at(i)->changeCost(ss);
+        int costIncrease = newCost - oldCost;
+
+        if (costIncrease < lowestCostIncrease) {
+            lowestCostIncrease = costIncrease;
+            insertBeforeSS = ssList.at(i);
+        }
+    } // of distinct state-sets iteration
+
+    if (insertBeforeSS) {
+        for (int i=startIndex; i<endIndex; ++i) {
+            if (m_drawables.at(i)->stateSet() == insertBeforeSS) {
+                m_drawables.insert(i, dr);
+                break;
+            }
+        }
+    } else {
+        // simply append
+        m_drawables.insert(endIndex, dr);
+    }
+}
+
+void OpaqueBin::removeDrawable(Drawable *dr)
+{
+    Q_CHECK_PTR(dr);
+    m_drawables.removeOne(dr);
+}
+
+
+} // of namespace