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util: Add util_format_get_component_shift

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Similar to util_format_get_component_bits, get the bit offset for a
particular channel in a given format.

Use this to calculate the shift/mask sets for formats when creating DRI
configs, as a prelude to ripping out and replacing the hardcoded table.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27709>
This commit is contained in:
Daniel Stone 2023-07-28 08:12:15 +01:00 • committed by Marge Bot
parent b3d419ad24
commit d3ed00f38a
2 changed files with 48 additions and 0 deletions
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5
src/gallium/frontends/dri/dri_screen.c
View file

@ -286,6 +286,11 @@ driCreateConfigs(enum pipe_format format,
for (i = 0; i < 4; i++) {
color_bits[i] =
util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, i);
int f_shift =
util_format_get_component_shift(format, UTIL_FORMAT_COLORSPACE_RGB, i);
assert(f_shift == shifts[i] || (f_shift == 0 && shifts[i] == -1));
uint32_t f_mask = ((1 << color_bits[i]) - 1) << f_shift;
assert(is_float || f_mask == masks[i]);
}
num_modes = num_depth_stencil_bits * num_db_modes * num_accum_bits * num_msaa_modes;

43
src/util/format/u_format.h
View file

@ -1000,6 +1000,49 @@ util_format_get_component_bits(enum pipe_format format,
}
}
static inline unsigned
util_format_get_component_shift(enum pipe_format format,
enum util_format_colorspace colorspace,
unsigned component)
{
const struct util_format_description *desc = util_format_description(format);
enum util_format_colorspace desc_colorspace;
assert(format);
if (!format) {
return 0;
}
assert(component < 4);
/* Treat RGB and SRGB as equivalent. */
if (colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {
colorspace = UTIL_FORMAT_COLORSPACE_RGB;
}
if (desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {
desc_colorspace = UTIL_FORMAT_COLORSPACE_RGB;
} else {
desc_colorspace = desc->colorspace;
}
if (desc_colorspace != colorspace) {
return 0;
}
switch (desc->swizzle[component]) {
case PIPE_SWIZZLE_X:
return desc->channel[0].shift;
case PIPE_SWIZZLE_Y:
return desc->channel[1].shift;
case PIPE_SWIZZLE_Z:
return desc->channel[2].shift;
case PIPE_SWIZZLE_W:
return desc->channel[3].shift;
default:
return 0;
}
}
/**
* Given a linear RGB colorspace format, return the corresponding SRGB
* format, or PIPE_FORMAT_NONE if none.