This is a proposal for new comparison instructions, as the old ones don't really fit modern (graphic or opencl I guess for that matter) languages well. If you've got objections, think the naming is crazy or whatnot I'm open for suggestions :-). I would think this is not just a much better fit for d3d10/glsl but for hw as well.
Roland Am 09.08.2013 20:40, schrieb srol...@vmware.com: > From: Roland Scheidegger <srol...@vmware.com> > > The old float comparison opcodes always return floats 0.0 and 1.0 (clarified > in docs these were really floats, was always the case) for legacy graphics. > But everybody else (opengl,opencl,d3d10) just has to work around their > return results (converting the returned float back to int/boolean). > --- > src/gallium/docs/source/tgsi.rst | 84 > ++++++++++++++++++++++++++++++-------- > 1 file changed, 68 insertions(+), 16 deletions(-) > > diff --git a/src/gallium/docs/source/tgsi.rst > b/src/gallium/docs/source/tgsi.rst > index 949ad89..b7c40cf 100644 > --- a/src/gallium/docs/source/tgsi.rst > +++ b/src/gallium/docs/source/tgsi.rst > @@ -512,13 +512,13 @@ This instruction replicates its result. > > .. math:: > > - dst.x = (src0.x == src1.x) ? 1 : 0 > + dst.x = (src0.x == src1.x) ? 1.0F : 0.0F > > - dst.y = (src0.y == src1.y) ? 1 : 0 > + dst.y = (src0.y == src1.y) ? 1.0F : 0.0F > > - dst.z = (src0.z == src1.z) ? 1 : 0 > + dst.z = (src0.z == src1.z) ? 1.0F : 0.0F > > - dst.w = (src0.w == src1.w) ? 1 : 0 > + dst.w = (src0.w == src1.w) ? 1.0F : 0.0F > > > .. opcode:: SFL - Set On False > @@ -538,13 +538,13 @@ This instruction replicates its result. > > .. math:: > > - dst.x = (src0.x > src1.x) ? 1 : 0 > + dst.x = (src0.x > src1.x) ? 1.0F : 0.0F > > - dst.y = (src0.y > src1.y) ? 1 : 0 > + dst.y = (src0.y > src1.y) ? 1.0F : 0.0F > > - dst.z = (src0.z > src1.z) ? 1 : 0 > + dst.z = (src0.z > src1.z) ? 1.0F : 0.0F > > - dst.w = (src0.w > src1.w) ? 1 : 0 > + dst.w = (src0.w > src1.w) ? 1.0F : 0.0F > > > .. opcode:: SIN - Sine > @@ -560,26 +560,26 @@ This instruction replicates its result. > > .. math:: > > - dst.x = (src0.x <= src1.x) ? 1 : 0 > + dst.x = (src0.x <= src1.x) ? 1.0F : 0.0F > > - dst.y = (src0.y <= src1.y) ? 1 : 0 > + dst.y = (src0.y <= src1.y) ? 1.0F : 0.0F > > - dst.z = (src0.z <= src1.z) ? 1 : 0 > + dst.z = (src0.z <= src1.z) ? 1.0F : 0.0F > > - dst.w = (src0.w <= src1.w) ? 1 : 0 > + dst.w = (src0.w <= src1.w) ? 1.0F : 0.0F > > > .. opcode:: SNE - Set On Not Equal > > .. math:: > > - dst.x = (src0.x != src1.x) ? 1 : 0 > + dst.x = (src0.x != src1.x) ? 1.0F : 0.0F > > - dst.y = (src0.y != src1.y) ? 1 : 0 > + dst.y = (src0.y != src1.y) ? 1.0F : 0.0F > > - dst.z = (src0.z != src1.z) ? 1 : 0 > + dst.z = (src0.z != src1.z) ? 1.0F : 0.0F > > - dst.w = (src0.w != src1.w) ? 1 : 0 > + dst.w = (src0.w != src1.w) ? 1.0F : 0.0F > > > .. opcode:: STR - Set On True > @@ -1325,6 +1325,19 @@ Support for these opcodes indicated by > PIPE_SHADER_CAP_INTEGERS (all of them?) > > > > +.. opcode:: FSLT - Float Set On Less Than (ordered) > + > +.. math:: > + > + dst.x = (src0.x < src1.x) ? ~0 : 0 > + > + dst.y = (src0.y < src1.y) ? ~0 : 0 > + > + dst.z = (src0.z < src1.z) ? ~0 : 0 > + > + dst.w = (src0.w < src1.w) ? ~0 : 0 > + > + > .. opcode:: ISLT - Signed Integer Set On Less Than > > .. math:: > @@ -1351,6 +1364,19 @@ Support for these opcodes indicated by > PIPE_SHADER_CAP_INTEGERS (all of them?) > dst.w = (src0.w < src1.w) ? ~0 : 0 > > > +.. opcode:: FSGE - Float Set On Greater Equal Than (ordered) > + > +.. math:: > + > + dst.x = (src0.x >= src1.x) ? ~0 : 0 > + > + dst.y = (src0.y >= src1.y) ? ~0 : 0 > + > + dst.z = (src0.z >= src1.z) ? ~0 : 0 > + > + dst.w = (src0.w >= src1.w) ? ~0 : 0 > + > + > .. opcode:: ISGE - Signed Integer Set On Greater Equal Than > > .. math:: > @@ -1377,6 +1403,19 @@ Support for these opcodes indicated by > PIPE_SHADER_CAP_INTEGERS (all of them?) > dst.w = (src0.w >= src1.w) ? ~0 : 0 > > > +.. opcode:: FSEQ - Float Set On Equal (ordered) > + > +.. math:: > + > + dst.x = (src0.x == src1.x) ? ~0 : 0 > + > + dst.y = (src0.y == src1.y) ? ~0 : 0 > + > + dst.z = (src0.z == src1.z) ? ~0 : 0 > + > + dst.w = (src0.w == src1.w) ? ~0 : 0 > + > + > .. opcode:: USEQ - Integer Set On Equal > > .. math:: > @@ -1390,6 +1429,19 @@ Support for these opcodes indicated by > PIPE_SHADER_CAP_INTEGERS (all of them?) > dst.w = (src0.w == src1.w) ? ~0 : 0 > > > +.. opcode:: FSNE - Float Set On Not Equal (unordered) > + > +.. math:: > + > + dst.x = (src0.x != src1.x) ? ~0 : 0 > + > + dst.y = (src0.y != src1.y) ? ~0 : 0 > + > + dst.z = (src0.z != src1.z) ? ~0 : 0 > + > + dst.w = (src0.w != src1.w) ? ~0 : 0 > + > + > .. opcode:: USNE - Integer Set On Not Equal > > .. math:: > _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
