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util: add new format helpers

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we'll use them

Reviewed-by: Yonggang Luo <luoyonggang@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28733>
This commit is contained in:
Marek Olšák 2024-03-25 02:27:01 -04:00 • committed by Marge Bot
parent 2bb102f020
commit 959891e33f
2 changed files with 56 additions and 0 deletions
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52
src/util/format/u_format.c
View file

@ -1468,3 +1468,55 @@ util_format_get_array(const enum util_format_type type, const unsigned bits,
return PIPE_FORMAT_NONE;
}
unsigned
util_format_get_last_component(enum pipe_format format)
{
const struct util_format_description *desc = util_format_description(format);
unsigned num = 0;
for (unsigned i = 1; i < 4; i++) {
if (desc->swizzle[i] <= PIPE_SWIZZLE_W)
num = i;
}
return num;
}
int
util_format_get_largest_non_void_channel(enum pipe_format format)
{
const struct util_format_description *desc = util_format_description(format);
int chan = -1, max_size = 0;
for (int i = 0; i < 4; i++) {
if (desc->channel[i].type != UTIL_FORMAT_TYPE_VOID &&
desc->channel[i].size > max_size) {
chan = i;
max_size = desc->channel[i].size;
}
}
return chan;
}
unsigned
util_format_get_max_channel_size(enum pipe_format format)
{
const struct util_format_description *desc = util_format_description(format);
int max_src_chan = util_format_get_largest_non_void_channel(format);
assert(max_src_chan >= 0 || util_format_is_compressed(format));
switch (format) {
case PIPE_FORMAT_BPTC_RGB_FLOAT:
case PIPE_FORMAT_BPTC_RGB_UFLOAT:
return 16;
case PIPE_FORMAT_ETC2_R11_UNORM:
case PIPE_FORMAT_ETC2_R11_SNORM:
case PIPE_FORMAT_ETC2_RG11_UNORM:
case PIPE_FORMAT_ETC2_RG11_SNORM:
return 11;
default:
return util_format_is_compressed(format) ?
8 : desc->channel[max_src_chan].size;
}
}

4
src/util/format/u_format.h
View file

@ -1797,6 +1797,10 @@ util_format_get_array(const enum util_format_type type, const unsigned bits,
const unsigned nr_components, const bool normalized,
const bool pure_integer);
unsigned util_format_get_last_component(enum pipe_format format);
int util_format_get_largest_non_void_channel(enum pipe_format format);
unsigned util_format_get_max_channel_size(enum pipe_format format);
#ifdef __cplusplus
} // extern "C" {
#endif