Code review comment for lp://qastaging/~vanvugt/mir/fix-1423462

Looks good.

Style nit:

+ if (renderable.shaped())

+ if (blend_func_dest == GL_ZERO)
+ glDisable(GL_BLEND);

If any clause of the if-elseif-else statement uses curly braces then all clauses (even single line ones) should use it for consistency.