st/mesa/i965: Allow decompressing ETC2 to GL_RGBA

When Mesa itself implements ETC2 decompression, it currently
decompresses to formats in the GL_BGRA component order.

That can be problematic for drivers which cannot upload the texture data
as GL_BGRA, such as Virgl when it's backed by GLES on the host.

So this commit adds a flag to _mesa_unpack_etc2_format so callers can
specify the optimal component order.

In Gallium's case, it will be requested if the format isn't in
PIPE_FORMAT_B8G8R8A8_SRGB format.

For i965, it will remain GL_BGRA, as before.

v2: * Remove unnecesary include (Emil Velikov)

Signed-off-by: Tomeu Vizoso <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/mesa/main/texcompress_etc.h b/src/mesa/main/texcompress_etc.h
index 319b7bea715..2c764b88b09 100644
--- a/src/mesa/main/texcompress_etc.h
+++ b/src/mesa/main/texcompress_etc.h
@@ -77,7 +77,8 @@ _mesa_unpack_etc2_format(uint8_t *dst_row,
                          unsigned src_stride,
                          unsigned src_width,
                          unsigned src_height,
-                         mesa_format format);
+			 mesa_format format,
+			 bool bgra);
 
 compressed_fetch_func
 _mesa_get_etc_fetch_func(mesa_format format);