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u_format: add inline helper to find first non void channel

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This is used in a few places in drivers as well, also the integer support
can use it as well.

Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2011-10-08 17:41:33 +01:00
parent b861479f83
commit 61285c6cfa
2 changed files with 22 additions and 8 deletions
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10
src/gallium/auxiliary/util/u_format.c
View file

@ -52,14 +52,8 @@ util_format_is_float(enum pipe_format format)
return FALSE;
}
/* Find the first non-void channel. */
for (i = 0; i < 4; i++) {
if (desc->channel[i].type != UTIL_FORMAT_TYPE_VOID) {
break;
}
}
if (i == 4) {
i = util_format_get_first_non_void_channel(format);
if (i == -1) {
return FALSE;
}

20
src/gallium/auxiliary/util/u_format.h
View file

@ -806,6 +806,26 @@ util_format_get_nr_components(enum pipe_format format)
return desc->nr_channels;
}
/**
* Return the index of the first non-void channel
* -1 if no non-void channels
*/
static INLINE int
util_format_get_first_non_void_channel(enum pipe_format format)
{
const struct util_format_description *desc = util_format_description(format);
int i;
for (i = 0; i < 4; i++)
if (desc->channel[i].type != UTIL_FORMAT_TYPE_VOID)
break;
if (i == 4)
return -1;
return i;
}
/*
* Format access functions.
*/