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gallium/util: add comment on util_is_format_compatible()

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From reading the code, it's not obvious what is src/dest compatible.
The list of a->b copy-compatible formats comes from Jose's original
check-in message, with some format name updates.

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
This commit is contained in:
Brian Paul 2016-09-20 16:05:48 -06:00
parent 99d9f764b2
commit b35684543e
1 changed files with 24 additions and 0 deletions
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24
src/gallium/auxiliary/util/u_format.c
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@ -457,6 +457,30 @@ util_format_write_4i(enum pipe_format format,
format_desc->pack_rgba_sint(dst_row, dst_stride, src_row, src_stride, w, h);
}
/**
* Check if we can safely memcopy from the source format to the dest format.
* This basically covers the cases of a "used" channel copied to a typeless
* channel, plus some 1-channel cases.
* Examples of compatible copy formats include:
* b8g8r8a8_unorm -> b8g8r8x8_unorm
* a8r8g8b8_unorm -> x8r8g8b8_unorm
* b5g5r5a1_unorm -> b5g5r5x1_unorm
* b4g4r4a4_unorm -> b4g4r4x4_unorm
* l8_unorm -> r8_unorm
* i8_unorm -> l8_unorm
* i8_unorm -> a8_unorm
* i8_unorm -> r8_unorm
* l16_unorm -> r16_unorm
* z24_unorm_s8_uint -> z24x8_unorm
* s8_uint_z24_unorm -> x8z24_unorm
* r8g8b8a8_unorm -> r8g8b8x8_unorm
* a8b8g8r8_srgb -> x8b8g8r8_srgb
* b8g8r8a8_srgb -> b8g8r8x8_srgb
* a8r8g8b8_srgb -> x8r8g8b8_srgb
* a8b8g8r8_unorm -> x8b8g8r8_unorm
* r10g10b10a2_uscaled -> r10g10b10x2_uscaled
* r10sg10sb10sa2u_norm -> r10g10b10x2_snorm
*/
boolean
util_is_format_compatible(const struct util_format_description *src_desc,
const struct util_format_description *dst_desc)