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gallium/util: add helper to clamp colors to valid range

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v3 (Iago):
 - Fix comment.

Signed-off-by: Juan A. Suarez Romero <jasuarez@igalia.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13409>
This commit is contained in:
Juan A. Suarez Romero 2021-10-29 16:04:47 +02:00 • committed by Marge Bot
parent da0cdc84d5
commit fa1cd83fef
2 changed files with 30 additions and 0 deletions
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27
src/gallium/auxiliary/util/u_helpers.c
View file

@ -25,6 +25,7 @@
*
**************************************************************************/
#include "util/format/format_utils.h"
#include "util/u_cpu_detect.h"
#include "util/u_helpers.h"
#include "util/u_inlines.h"
@ -518,3 +519,29 @@ util_init_pipe_vertex_state(struct pipe_screen *screen,
state->input.elements[i] = elements[i];
state->input.full_velem_mask = full_velem_mask;
}
/**
* Clamp color value to format range.
*/
union pipe_color_union
util_clamp_color(enum pipe_format format,
const union pipe_color_union *color)
{
union pipe_color_union clamp_color = *color;
int i;
for (i = 0; i < util_format_get_nr_components(format); i++) {
uint8_t bits = util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, i);
if (util_format_is_unorm(format))
clamp_color.ui[i] = _mesa_unorm_to_unorm(clamp_color.ui[i], bits, bits);
else if (util_format_is_snorm(format))
clamp_color.i[i] = _mesa_snorm_to_snorm(clamp_color.i[i], bits, bits);
else if (util_format_is_pure_uint(format))
clamp_color.ui[i] = _mesa_unsigned_to_unsigned(clamp_color.ui[i], bits);
else if (util_format_is_pure_sint(format))
clamp_color.i[i] = _mesa_signed_to_signed(clamp_color.i[i], bits);
}
return clamp_color;
}

3
src/gallium/auxiliary/util/u_helpers.h
View file

@ -130,6 +130,9 @@ util_init_pipe_vertex_state(struct pipe_screen *screen,
uint32_t full_velem_mask,
struct pipe_vertex_state *state);
union pipe_color_union util_clamp_color(enum pipe_format format,
const union pipe_color_union *color);
#ifdef __cplusplus
}
#endif