Re: [AD] fix for using transformations without a display and make blending mode a per-display state

[Pavel Sountsov <slabode@xxxxxxxxxx>]

Elias Pschernig wrote:
> > The draw_parallelogram function actually in principle supports 
> > transformations, since it just needs the 3 corners of the parallelogram, 
> > which can be obtained by transforming the bitmap rectangle corners in a 
> > function immediately before it. This is in fact, as far as I remember, 
> > what happens for rotated/scaled bitmaps. See rotate.c for that code.
>
> Hm, I see. So as long as our transformations are strictly 3x3 matrices
> only it should work.

Yeah, I don't really see a big problem with that. Allegro 5, and the 
core especially, really seems to ignore the 3rd dimension, so it would 
be fine for it to not support 4x4 matrices. In fact, the primitives 
addon does not support 4x4 matrices either right now (I of course only 
mean the memory routines, the hardware accelerated routines obviously 
support them); it is just a matter of implementing the right steppers 
though, not something that arises from design issues.

-SiegeLord