[Mesa-dev] GLSL IR int-to-float pass

Jerome Glisse j.glisse at gmail.com
Wed May 25 06:32:49 PDT 2011

On Tue, May 24, 2011 at 8:09 PM, Bryan Cain <bryancain3 at gmail.com> wrote:
> Hi,
> In the past few days, I've been working on native integer support in my
> GLSL to TGSI translator.  Something that's come to my attention is that
> supporting Gallium targets with and without integer support using a
> single GLSL IR backend will more or less require a GLSL IR pass to
> convert int, uint, and possibly bool variables and operations to floats.
> Currently, this is done directly in the backend, in both ir_to_mesa and
> st_glsl_to_tgsi.  However, the mod_to_fract and div_to_mul_rcp lowering
> passes for GLSL IR need to know whether to lower integer modulus and
> division operations to their corresponding float operations.  (They both
> do this in Mesa master without asking the backend, but that will be easy
> to change later.)  So a GLSL IR pass will be needed to do the type lowering.
> Such a pass would also have the advantage of less duplicated
> functionality between backends, since ir_to_mesa could also take
> advantage of the pass to eliminate some code.
> I'm more than willing to try writing such a pass myself if no one else
> is interested in doing it, but I figure I should make sure there are no
> objections before starting on it.
> Bryan

TGSI needs to grow type support (int, uint and possibly int8,16,32..)


More information about the mesa-dev mailing list