BF,RF: Texture.texCoordXform is passed the data shape sans nvalues, so should

not drop the first entry. GLRGBVolume adjusts texture coordinates for 2D
images.

fsleyes/gl/glrgbvolume.py

@@ -13,6 +13,7 @@ import numpy                as np
 import OpenGL.GL            as gl
 
 import fsl.utils.idle       as idle
+import fsl.transform.affine as affine
 
 import fsleyes.gl           as fslgl
 import fsleyes.gl.routines  as glroutines
@@ -190,6 +191,23 @@ class GLRGBVolume(glimageobject.GLImageObject):
         self.updateShaderState()
 
 
+    def generateVertices2D(self, zpos, axes, bbox=None):
+        """Overrides :meth:`.GLImageObject.generateVertices2D`.
+
+        Appliies the :meth:`.ImageTextureBase.texCoordXform` to the texture
+        coordinates - this is performed to support 2D images/textures.
+        """
+
+        vertices, voxCoords, texCoords = \
+            glimageobject.GLImageObject.generateVertices2D(
+                self, zpos, axes, bbox)
+
+        texCoords = affine.transform(
+            texCoords, self.imageTexture.texCoordXform(self.overlay.shape))
+
+        return vertices, voxCoords, texCoords
+
+
     def channelColours(self):
         """Returns a ``numpy`` array of shape ``(3, 4)``, containing the
         colours to use for each of the three channels.

fsleyes/gl/textures/texture2d.py

@@ -303,9 +303,6 @@ class Texture2D(texture.Texture):
         if origShape is None:
             return None
 
-        if self.nvals > 1:
-            origShape = origShape[1:]
-
         # Here we apply a rotation to the
         # coordinates to force the two major
         # voxel axes to map to the first two