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util: Add util_format_get_array.

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This is a poor man's version of MESA_ARRAY_FORMAT.
Implemented based on a gigantic switch-case
with some help from the C preprocessor.
Thank you, preprocessor!

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21692>
This commit is contained in:
Timur Kristóf 2023-02-17 20:14:00 +01:00 • committed by Marge Bot
parent 26c51bb8d8
commit d89aea73e2
2 changed files with 73 additions and 0 deletions
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67
src/util/format/u_format.c
View file

@ -1367,3 +1367,70 @@ util_format_rgbx_to_rgba(enum pipe_format format)
}
}
}
enum pipe_format
util_format_get_array(const enum util_format_type type, const unsigned bits,
const unsigned nr_components, const bool normalized,
const bool pure_integer)
{
#define CASE_BY_BIT_SWITCH_BY_NR_COMPONENTS_1TO4(TYPE, BITS, NR_VAR) \
case BITS: \
switch (NR_VAR) { \
case 1: \
return PIPE_FORMAT_R##BITS##_##TYPE; \
case 2: \
return PIPE_FORMAT_R##BITS##G##BITS##_##TYPE; \
case 3: \
return PIPE_FORMAT_R##BITS##G##BITS##B##BITS##_##TYPE; \
case 4: \
return PIPE_FORMAT_R##BITS##G##BITS##B##BITS##A##BITS##_##TYPE; \
default: \
return PIPE_FORMAT_NONE; \
}
#define SWITCH_BY_BITS_CASEX3(TYPE, BITS_VAR, BITS1, BITS2, BITS3, NR_VAR) \
switch (BITS_VAR) { \
CASE_BY_BIT_SWITCH_BY_NR_COMPONENTS_1TO4(TYPE, BITS1, NR_VAR) \
CASE_BY_BIT_SWITCH_BY_NR_COMPONENTS_1TO4(TYPE, BITS2, NR_VAR) \
CASE_BY_BIT_SWITCH_BY_NR_COMPONENTS_1TO4(TYPE, BITS3, NR_VAR) \
default: \
return PIPE_FORMAT_NONE; \
}
#define SWITCH_BY_BITS_CASEX4(TYPE, BITS_VAR, BITS1, BITS2, BITS3, BITS4, NR_VAR) \
switch (BITS_VAR) { \
CASE_BY_BIT_SWITCH_BY_NR_COMPONENTS_1TO4(TYPE, BITS1, NR_VAR) \
CASE_BY_BIT_SWITCH_BY_NR_COMPONENTS_1TO4(TYPE, BITS2, NR_VAR) \
CASE_BY_BIT_SWITCH_BY_NR_COMPONENTS_1TO4(TYPE, BITS3, NR_VAR) \
CASE_BY_BIT_SWITCH_BY_NR_COMPONENTS_1TO4(TYPE, BITS4, NR_VAR) \
default: \
return PIPE_FORMAT_NONE; \
}
switch (type) {
case UTIL_FORMAT_TYPE_UNSIGNED:
if (normalized)
SWITCH_BY_BITS_CASEX3(UNORM, bits, 8, 16, 32, nr_components)
else if (!pure_integer)
SWITCH_BY_BITS_CASEX3(USCALED, bits, 8, 16, 32, nr_components)
else
SWITCH_BY_BITS_CASEX4(UINT, bits, 8, 16, 32, 64, nr_components)
case UTIL_FORMAT_TYPE_SIGNED:
if (normalized)
SWITCH_BY_BITS_CASEX3(SNORM, bits, 8, 16, 32, nr_components)
else if (!pure_integer)
SWITCH_BY_BITS_CASEX3(SSCALED, bits, 8, 16, 32, nr_components)
else
SWITCH_BY_BITS_CASEX4(SINT, bits, 8, 16, 32, 64, nr_components)
case UTIL_FORMAT_TYPE_FLOAT:
SWITCH_BY_BITS_CASEX3(FLOAT, bits, 16, 32, 64, nr_components)
default:
return PIPE_FORMAT_NONE;
}
#undef CASE_BY_BIT_SWITCH_BY_NR_COMPONENTS_1TO4
#undef SWITCH_BY_BITS_CASEX3
#undef SWITCH_BY_BITS_CASEX4
return PIPE_FORMAT_NONE;
}

6
src/util/format/u_format.h
View file

@ -1706,6 +1706,12 @@ util_format_snorm_to_unorm(enum pipe_format format);
enum pipe_format
util_format_rgbx_to_rgba(enum pipe_format format);
/* Returns the pipe format for the given array type, bitsize and component count. */
enum pipe_format
util_format_get_array(const enum util_format_type type, const unsigned bits,
const unsigned nr_components, const bool normalized,
const bool pure_integer);
#ifdef __cplusplus
} // extern "C" {
#endif