diff options
| -rw-r--r-- | src/gallium/auxiliary/util/u_format.h | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/util/u_format.h b/src/gallium/auxiliary/util/u_format.h index 8e786a390a0..59bd03b7740 100644 --- a/src/gallium/auxiliary/util/u_format.h +++ b/src/gallium/auxiliary/util/u_format.h @@ -440,6 +440,39 @@ util_format_is_depth_and_stencil(enum pipe_format format) desc->swizzle[1] != UTIL_FORMAT_SWIZZLE_NONE) ? TRUE : FALSE; } + +/** + * Give the RGBA colormask of the channels that can be represented in this + * format. + * + * That is, the channels whose values are preserved. + */ +static INLINE unsigned +util_format_colormask(const struct util_format_description *desc) +{ + unsigned colormask; + unsigned chan; + + switch (desc->colorspace) { + case UTIL_FORMAT_COLORSPACE_RGB: + case UTIL_FORMAT_COLORSPACE_SRGB: + case UTIL_FORMAT_COLORSPACE_YUV: + colormask = 0; + for (chan = 0; chan < 4; ++chan) { + if (desc->swizzle[chan] < 4) { + colormask |= (1 << chan); + } + } + return colormask; + case UTIL_FORMAT_COLORSPACE_ZS: + return 0; + default: + assert(0); + return 0; + } +} + + /** * Whether this format is a rgab8 variant. * |