On Thu, Oct 23, 2014 at 04:44:03PM -0700, Matt Turner wrote: > --- > src/mesa/drivers/dri/i965/Makefile.sources | 1 + > src/mesa/drivers/dri/i965/brw_packed_float.c | 74 > ++++++++++++++++++++++++++++ > src/mesa/drivers/dri/i965/brw_packed_float.h | 25 ++++++++++ > 3 files changed, 100 insertions(+) > create mode 100644 src/mesa/drivers/dri/i965/brw_packed_float.c > create mode 100644 src/mesa/drivers/dri/i965/brw_packed_float.h > > diff --git a/src/mesa/drivers/dri/i965/Makefile.sources > b/src/mesa/drivers/dri/i965/Makefile.sources > index 9c006da..6b0f601 100644 > --- a/src/mesa/drivers/dri/i965/Makefile.sources > +++ b/src/mesa/drivers/dri/i965/Makefile.sources > @@ -78,6 +78,7 @@ i965_FILES = \ > brw_meta_fast_clear.c \ > brw_misc_state.c \ > brw_object_purgeable.c \ > + brw_packed_float.c \ > brw_performance_monitor.c \ > brw_program.c \ > brw_primitive_restart.c \ > diff --git a/src/mesa/drivers/dri/i965/brw_packed_float.c > b/src/mesa/drivers/dri/i965/brw_packed_float.c > new file mode 100644 > index 0000000..d25e7dd > --- /dev/null > +++ b/src/mesa/drivers/dri/i965/brw_packed_float.c > @@ -0,0 +1,74 @@ > +/* > + * Copyright © 2014 Intel Corporation > + * > + * Permission is hereby granted, free of charge, to any person obtaining a > + * copy of this software and associated documentation files (the "Software"), > + * to deal in the Software without restriction, including without limitation > + * the rights to use, copy, modify, merge, publish, distribute, sublicense, > + * and/or sell copies of the Software, and to permit persons to whom the > + * Software is furnished to do so, subject to the following conditions: > + * > + * The above copyright notice and this permission notice (including the next > + * paragraph) shall be included in all copies or substantial portions of the > + * Software. > + * > + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR > + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, > + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL > + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER > + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING > + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER > DEALINGS > + * IN THE SOFTWARE. > + */ > +#include "brw_packed_float.h" > + > +union fu { > + float f; > + unsigned u; > + struct { > + unsigned mantissa:23; > + unsigned exponent:8; > + unsigned sign:1; > + }; > +}; > + > +int > +brw_float_to_vf(float f) > +{ > + union fu fu = { .f = f }; > + > + /* ±0.0f is special cased. */ > + if (f == 0.0f) > + return fu.sign << 7; > + > + unsigned mantissa = fu.mantissa >> (23 - 4); > + unsigned exponent = fu.exponent - (127 - 3);
& 0x7 > + unsigned vf = (fu.sign << 7) | (exponent << 4) | mantissa; > + > + /* 0.125 would have had the same representation as 0.0, so reject it. */ > + if (vf & 0x7f) > + return -1; (vf & 0x7f) == 0 ? > + > + if (fu.u & 0x7ffff || exponent >= 8) > + return -1; > + > + return vf; > +} > + > +float > +brw_vf_to_float(unsigned char vf) > +{ > + union fu fu; > + > + /* ±0.0f is special cased. */ > + if (vf == 0x00 || vf == 0x80) { > + fu.u = vf << 24; > + return fu.f; > + } > + > + fu.sign = vf >> 7; > + fu.exponent = ((vf & 0xf0) >> 4) + (127 - 3); > + fu.mantissa = (vf & 0xf) << (23 - 4); > + > + return fu.f; > +} > diff --git a/src/mesa/drivers/dri/i965/brw_packed_float.h > b/src/mesa/drivers/dri/i965/brw_packed_float.h > new file mode 100644 > index 0000000..8b6825f > --- /dev/null > +++ b/src/mesa/drivers/dri/i965/brw_packed_float.h > @@ -0,0 +1,25 @@ > +/* > + * Copyright © 2014 Intel Corporation > + * > + * Permission is hereby granted, free of charge, to any person obtaining a > + * copy of this software and associated documentation files (the "Software"), > + * to deal in the Software without restriction, including without limitation > + * the rights to use, copy, modify, merge, publish, distribute, sublicense, > + * and/or sell copies of the Software, and to permit persons to whom the > + * Software is furnished to do so, subject to the following conditions: > + * > + * The above copyright notice and this permission notice (including the next > + * paragraph) shall be included in all copies or substantial portions of the > + * Software. > + * > + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR > + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, > + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL > + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER > + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING > + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER > DEALINGS > + * IN THE SOFTWARE. > + */ > + > +int brw_float_to_vf(float f); > +float brw_vf_to_float(unsigned char vf); > -- > 2.0.4 > > _______________________________________________ > mesa-dev mailing list > mesa-dev@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/mesa-dev -- Ville Syrjälä syrj...@sci.fi http://www.sci.fi/~syrjala/ _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev