From 3e0a82b52ebbf306adb0dd0f0990f7a8e8b271c5 Mon Sep 17 00:00:00 2001 From: Rob Clark Date: Fri, 12 Sep 2014 08:42:03 -0400 Subject: util/u_format: add _is_alpha() Because of render-to-alpha (000x) shenanigans, freedreno needs to do some special handling when rendering to alpha-only formats. And I noticed that while we had _is_luminance(), _is_intensity(), etc, an _is_alpha() helper was missing. So fix that. Signed-off-by: Rob Clark --- src/gallium/auxiliary/util/u_format.c | 17 +++++++++++++++++ src/gallium/auxiliary/util/u_format.h | 2 ++ 2 files changed, 19 insertions(+) (limited to 'src/gallium') diff --git a/src/gallium/auxiliary/util/u_format.c b/src/gallium/auxiliary/util/u_format.c index d53dd7884f0..c1ce408119f 100644 --- a/src/gallium/auxiliary/util/u_format.c +++ b/src/gallium/auxiliary/util/u_format.c @@ -91,6 +91,23 @@ util_format_is_luminance(enum pipe_format format) return FALSE; } +boolean +util_format_is_alpha(enum pipe_format format) +{ + const struct util_format_description *desc = + util_format_description(format); + + if ((desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB || + desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) && + desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_0 && + desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_0 && + desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_0 && + desc->swizzle[3] == UTIL_FORMAT_SWIZZLE_X) { + return TRUE; + } + return FALSE; +} + boolean util_format_is_pure_integer(enum pipe_format format) { diff --git a/src/gallium/auxiliary/util/u_format.h b/src/gallium/auxiliary/util/u_format.h index df31400af90..621574c9673 100644 --- a/src/gallium/auxiliary/util/u_format.h +++ b/src/gallium/auxiliary/util/u_format.h @@ -661,6 +661,8 @@ util_format_has_alpha(enum pipe_format format); boolean util_format_is_luminance(enum pipe_format format); +boolean +util_format_is_alpha(enum pipe_format format); boolean util_format_is_luminance_alpha(enum pipe_format format); -- cgit v1.2.3