Fixed rendering order (solves background texture vs. transparent foreground texture issue)

src/pulsaranimationwidget.cpp

@@ -250,6 +250,7 @@ void PulsarAnimationWidget::paintGL()
 
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
+    // initial perspective/camera setup
     glMatrixMode(GL_MODELVIEW);
     glLoadIdentity();
 
@@ -257,6 +258,41 @@ void PulsarAnimationWidget::paintGL()
               0.0, 0.0, 0.0,
               0.0, 1.0, 0.0);
 
+    // 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
+            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
+            glColor3f(1.0f, 1.0f, 1.0f);
+            glTranslatef(0.0, 0.0, -501.0);
+            drawTexture(QPointF(0.0, 0.0), m_backgroundTexture);
+
+            // restore original state
+            glMatrixMode(GL_PROJECTION);
+        }
+        glPopMatrix();
+        glMatrixMode(GL_MODELVIEW);
+    }
+    glPopMatrix();
+
+    // define materials
     // TODO: should be located elsewhere
     static GLfloat no_mat[] = {0.0, 0.0, 0.0, 1.0};
     static GLfloat mat_diffuse[] = {0.5, 0.5, 0.5, 1.0};
@@ -479,39 +515,7 @@ void PulsarAnimationWidget::paintGL()
 
     glPolygonMode(GL_FRONT_AND_BACK,GL_FILL);
 
-    // save current state
-    glMatrixMode(GL_PROJECTION);
-    glPushMatrix();
-    {
-        glLoadIdentity();
-        glOrtho(0, width(), 0, height(), 0.1, 501.0);
-        glMatrixMode(GL_MODELVIEW);
-        glPushMatrix();
-        {
-            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 (independent parallel projection)
-            glColor3f(1.0f, 1.0f, 1.0f);
-            glTranslatef(0.0, 0.0, -501.0);
-            drawTexture(QPointF(0.0, 0.0), m_backgroundTexture);
-
-            // restore original state
-            glMatrixMode(GL_PROJECTION);
-        }
-        glPopMatrix();
-        glMatrixMode(GL_MODELVIEW);
-    }
-    glPopMatrix();
 }
 
 void PulsarAnimationWidget::runAnimation()