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intel/isl: Add a helper for inverting swizzles 

Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
This commit is contained in:
Jason Ekstrand 2017-02-08 17:59:43 -08:00
parent 242f6f7492
commit 1ef4f5aff1
2 changed files with 32 additions and 0 deletions
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30
src/intel/isl/isl.c
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@ -2410,3 +2410,33 @@ isl_swizzle_compose(struct isl_swizzle first, struct isl_swizzle second)
.a = swizzle_select(first.a, second),
};
}
/**
* Returns a swizzle that is the pseudo-inverse of this swizzle.
*/
struct isl_swizzle
isl_swizzle_invert(struct isl_swizzle swizzle)
{
/* Default to zero for channels which do not show up in the swizzle */
enum isl_channel_select chans[4] = {
ISL_CHANNEL_SELECT_ZERO,
ISL_CHANNEL_SELECT_ZERO,
ISL_CHANNEL_SELECT_ZERO,
ISL_CHANNEL_SELECT_ZERO,
};
/* We go in ABGR order so that, if there are any duplicates, the first one
* is taken if you look at it in RGBA order. This is what Haswell hardware
* does for render target swizzles.
*/
if ((unsigned)(swizzle.a - ISL_CHANNEL_SELECT_RED) < 4)
chans[swizzle.a - ISL_CHANNEL_SELECT_RED] = ISL_CHANNEL_SELECT_ALPHA;
if ((unsigned)(swizzle.b - ISL_CHANNEL_SELECT_RED) < 4)
chans[swizzle.b - ISL_CHANNEL_SELECT_RED] = ISL_CHANNEL_SELECT_BLUE;
if ((unsigned)(swizzle.g - ISL_CHANNEL_SELECT_RED) < 4)
chans[swizzle.g - ISL_CHANNEL_SELECT_RED] = ISL_CHANNEL_SELECT_GREEN;
if ((unsigned)(swizzle.r - ISL_CHANNEL_SELECT_RED) < 4)
chans[swizzle.r - ISL_CHANNEL_SELECT_RED] = ISL_CHANNEL_SELECT_RED;
return (struct isl_swizzle) { chans[0], chans[1], chans[2], chans[3] };
}

2
src/intel/isl/isl.h
View File

@ -1746,6 +1746,8 @@ isl_swizzle_supports_rendering(const struct gen_device_info *devinfo,
struct isl_swizzle
isl_swizzle_compose(struct isl_swizzle first, struct isl_swizzle second);
struct isl_swizzle
isl_swizzle_invert(struct isl_swizzle swizzle);
#define isl_surf_init(dev, surf, ...) \
isl_surf_init_s((dev), (surf), \