Since rB6269d66da, creating formats no longer depends solely on the shader, but now depends on the dimensions used to fill the VBOs. This allows 3D shaders to work flawlessly when assigned dimensions are 2D. So there's no real benefit to us having shaders that are limited to 2D use anymore. This limitation makes it difficult to implement other builtin shaders as they indirectly require a 2D version. So this commit removes the 2D versions of the builtin sahders used in Python , renames the string enums but keeps the old enums working for backward compatibility. (This brings parts of the changes reviewed in D15836).