delete texture and framebuffer after export

pyqtgraph/opengl/GLViewWidget.py

@@ -350,7 +350,8 @@ class GLViewWidget(QtOpenGL.QGLWidget):
         w,h = map(int, size)
         
         self.makeCurrent()
-        
+        tex = None
+        fb = None
         try:
             output = np.empty((w, h, 4), dtype=np.ubyte)
             fb = glfbo.glGenFramebuffers(1)
@@ -392,6 +393,10 @@ class GLViewWidget(QtOpenGL.QGLWidget):
             self.opts['viewport'] = None
             glfbo.glBindFramebuffer(glfbo.GL_FRAMEBUFFER, 0)
             glBindTexture(GL_TEXTURE_2D, 0)
+            if tex is not None:
+                glDeleteTextures([tex])
+            if fb is not None:
+                glfbo.glDeleteFramebuffers([fb])
             
         return output