When bumpmapping is turned on and operating in single-pass mode, the primary colors (ambient, diffuse, specular, emissive) are overridden. In multi-pass rendering this is resolved by blending the second pass, however, in single-pass we'll need to use texture unit to apply the primary colors post-bumpmap.

This step has already been added, but the code to actually activate and deactivate the primary combiner texture isn't in place. This may require a dummy 1x1 texture as a placeholder or other "tricks" to get it working.

You should be able to Textured('red', bumpmap=b) to get a red tinted bumpmap and changing the color should only change the tint.

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