From f0c1773c95a5802cbdedd64ff3d7b283ed63dd95 Mon Sep 17 00:00:00 2001
From: Oliver Bock <oliver.bock@aei.mpg.de>
Date: Thu, 29 Jul 2010 15:05:38 +0200
Subject: [PATCH] Move copyright info to the end of render chain again (it's
 the foremost object)

---
 src/pulsaranimationwidget.cpp | 39 +++++++++++++++++++++++++----------
 1 file changed, 28 insertions(+), 11 deletions(-)

diff --git a/src/pulsaranimationwidget.cpp b/src/pulsaranimationwidget.cpp
index a67fe4b..5504768 100644
--- a/src/pulsaranimationwidget.cpp
+++ b/src/pulsaranimationwidget.cpp
@@ -268,17 +268,7 @@ void PulsarAnimationWidget::paintGL()
         {
             glLoadIdentity();
 
-            // draw copyright info
-            glColor4f(1.0f, 1.0f, 1.0f, 0.5f);
-            QFont font;
-            font.setPointSize(11);
-            font.setBold(true);
-            font.setFamily("Arial");
-            font.setStyleStrategy((QFont::StyleStrategy) (QFont::OpenGLCompatible | QFont::PreferQuality));
-            renderText(10, 25, -100, QString::fromLocal8Bit("Copyright © 2009-2010"), font);
-            renderText(10, 10, -100, QString::fromLocal8Bit("Max-Planck-Insitut für Gravitationsphysik"), font);
-
-            // draw backdrop
+            // draw backdrop first so that foreground alpha blending works correctly
             glColor3f(1.0f, 1.0f, 1.0f);
             glTranslatef(0.0, 0.0, -501.0);
             drawTexture(QPointF(0.0, 0.0), m_backgroundTexture);
@@ -514,7 +504,34 @@ void PulsarAnimationWidget::paintGL()
 
     glPolygonMode(GL_FRONT_AND_BACK,GL_FILL);
 
+    // save current state (the following is using parallel projection)
+    glMatrixMode(GL_PROJECTION);
+    glPushMatrix();
+    {
+        glLoadIdentity();
+        glOrtho(0, width(), 0, height(), 0.1, 501.0);
+        glMatrixMode(GL_MODELVIEW);
+        glPushMatrix();
+        {
+            glLoadIdentity();
 
+            // draw copyright info last (appears in front of everything)
+            glColor4f(1.0f, 1.0f, 1.0f, 0.5f);
+            QFont font;
+            font.setPointSize(11);
+            font.setBold(true);
+            font.setFamily("Arial");
+            font.setStyleStrategy((QFont::StyleStrategy) (QFont::OpenGLCompatible | QFont::PreferQuality));
+            renderText(10, 25, -100, QString::fromLocal8Bit("Copyright © 2009-2010"), font);
+            renderText(10, 10, -100, QString::fromLocal8Bit("Max-Planck-Insitut für Gravitationsphysik"), font);
+
+            // restore original state
+            glMatrixMode(GL_PROJECTION);
+        }
+        glPopMatrix();
+        glMatrixMode(GL_MODELVIEW);
+    }
+    glPopMatrix();
 }
 
 void PulsarAnimationWidget::runAnimation()
-- 
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