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util/format: add helper to check if a format is scaled. 

lavapipe/llvmpipe need this to rule out scaled formats for non-vertex
format usage. Note NONE is defined as scaled in u_format, but for
the purposes of this helper I don't want it to be considered scaled.

Reviewed-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8907>
This commit is contained in:
Dave Airlie 2021-02-08 14:58:50 +10:00 committed by Marge Bot
parent 2b6d59bd8c
commit 8258726d90
2 changed files with 25 additions and 0 deletions
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23
src/util/format/u_format.c
View File

@ -234,6 +234,29 @@ util_format_is_unorm(enum pipe_format format)
return desc->is_unorm;
}
/**
* Returns true if the format contains scaled integer format channels.
*/
boolean
util_format_is_scaled(enum pipe_format format)
{
const struct util_format_description *desc = util_format_description(format);
int i;
/* format none is described as scaled but not for this check */
if (format == PIPE_FORMAT_NONE)
return FALSE;
/* Find the first non-void channel. */
i = util_format_get_first_non_void_channel(format);
if (i == -1)
return FALSE;
return !desc->channel[i].pure_integer && !desc->channel[i].normalized &&
(desc->channel[i].type == UTIL_FORMAT_TYPE_SIGNED ||
desc->channel[i].type == UTIL_FORMAT_TYPE_UNSIGNED);
}
boolean
util_format_is_snorm8(enum pipe_format format)
{

2
src/util/format/u_format.h
View File

@ -729,6 +729,8 @@ util_format_is_unorm(enum pipe_format format) ATTRIBUTE_CONST;
boolean
util_format_is_snorm8(enum pipe_format format) ATTRIBUTE_CONST;
boolean
util_format_is_scaled(enum pipe_format format) ATTRIBUTE_CONST;
/**
* Check if the src format can be blitted to the destination format with
* a simple memcpy. For example, blitting from RGBA to RGBx is OK, but not