Added checks for OpenGL version and 3D texture size limits

Added script for reporting GL version info

opengl/GLViewWidget.py

@@ -29,12 +29,18 @@ class GLViewWidget(QtOpenGL.QGLWidget):
         self.keysPressed = {}
         self.keyTimer = QtCore.QTimer()
         self.keyTimer.timeout.connect(self.evalKeyState)
+        
+        self.makeCurrent()
 
     def addItem(self, item):
         self.items.append(item)
         if hasattr(item, 'initializeGL'):
             self.makeCurrent()
-            item.initializeGL()
+            try:
+                item.initializeGL()
+            except:
+                self.checkOpenGLVersion('Error while adding item %s to GLViewWidget.' % str(item))
+                
         item._setView(self)
         #print "set view", item, self, item.view()
         self.update()
@@ -100,9 +106,15 @@ class GLViewWidget(QtOpenGL.QGLWidget):
                     glPushAttrib(GL_ALL_ATTRIB_BITS)
                     i.paint()
                 except:
-                    import sys
-                    sys.excepthook(*sys.exc_info())
-                    print("Error while drawing item", i)
+                    import pyqtgraph.debug
+                    pyqtgraph.debug.printExc()
+                    msg = "Error while drawing item %s." % str(item)
+                    ver = glGetString(GL_VERSION).split()[0]
+                    if int(ver.split('.')[0]) < 2:
+                        print(msg + " The original exception is printed above; however, pyqtgraph requires OpenGL version 2.0 or greater for many of its 3D features and your OpenGL version is %s. Installing updated display drivers may resolve this issue." % ver)
+                    else:
+                        print(msg)
+                    
                 finally:
                     glPopAttrib(GL_ALL_ATTRIB_BITS)
             else:
@@ -237,4 +249,15 @@ class GLViewWidget(QtOpenGL.QGLWidget):
         else:
             self.keyTimer.stop()
 
+    def checkOpenGLVersion(self, msg):
+        ## Only to be called from within exception handler.
+        ver = glGetString(GL_VERSION).split()[0]
+        if int(ver.split('.')[0]) < 2:
+            import pyqtgraph.debug
+            pyqtgraph.debug.printExc()
+            raise Exception(msg + " The original exception is printed above; however, pyqtgraph requires OpenGL version 2.0 or greater for many of its 3D features and your OpenGL version is %s. Installing updated display drivers may resolve this issue." % ver)
+        else:
+            raise
+            
+
         
\ No newline at end of file

opengl/glInfo.py

+from pyqtgraph.Qt import QtCore, QtGui, QtOpenGL
+from OpenGL.GL import *
+app = QtGui.QApplication([])
+
+class GLTest(QtOpenGL.QGLWidget):
+    def __init__(self):
+        QtOpenGL.QGLWidget.__init__(self)
+        self.makeCurrent()
+        print "GL version:", glGetString(GL_VERSION)
+        print "MAX_TEXTURE_SIZE:", glGetIntegerv(GL_MAX_TEXTURE_SIZE)
+        print "MAX_3D_TEXTURE_SIZE:", glGetIntegerv(GL_MAX_3D_TEXTURE_SIZE)
+        print "Extensions:", glGetString(GL_EXTENSIONS)
+
+GLTest()
+
+

opengl/items/GLVolumeItem.py

@@ -43,6 +43,11 @@ class GLVolumeItem(GLGraphicsItem):
         glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_BORDER)
         shape = self.data.shape
         
+        ## Test texture dimensions first
+        glTexImage3D(GL_PROXY_TEXTURE_3D, 0, GL_RGBA, shape[0], shape[1], shape[2], 0, GL_RGBA, GL_UNSIGNED_BYTE, None)
+        if glGetTexLevelParameteriv(GL_PROXY_TEXTURE_3D, 0, GL_TEXTURE_WIDTH) == 0:
+            raise Exception("OpenGL failed to create 3D texture (%dx%dx%d); too large for this hardware." % shape[:3])
+        
         glTexImage3D(GL_TEXTURE_3D, 0, GL_RGBA, shape[0], shape[1], shape[2], 0, GL_RGBA, GL_UNSIGNED_BYTE, self.data.transpose((2,1,0,3)))
         glDisable(GL_TEXTURE_3D)