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| author | Brian Paul <brianp@vmware.com> | 2016-09-20 16:05:48 -0600 |
|---|---|---|
| committer | Brian Paul <brianp@vmware.com> | 2016-09-21 12:26:17 -0600 |
| commit | b35684543ed43c3ac2aa2710e3974fbfaf9c2f7c (patch) | |
| tree | 975dd906548cab541edbbaf2e79853fd5a1a10e7 | |
| parent | 99d9f764b22e80865f8ff9b402a11a4334e5bbd0 (diff) | |
gallium/util: add comment on util_is_format_compatible()
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>
| -rw-r--r-- | src/gallium/auxiliary/util/u_format.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/util/u_format.c b/src/gallium/auxiliary/util/u_format.c index cbdb5ce9dd..72dd60f6e1 100644 --- a/src/gallium/auxiliary/util/u_format.c +++ b/src/gallium/auxiliary/util/u_format.c @@ -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) |