If the user supplies a pixel format of GL_RGB + GL_UNSIGNED_SHORT_5_6_5
and specifies a generic unsized GL_RGB internal format, match that to a
texture format of MESA_FORMAT_B5G6R5 if supported by the hardware.
Noticed while playing with mesa-demos/teximage:
TexImage(RGB/565 256 x 256): 79.8 images/sec, 10.0 MB/sec
TexSubImage(RGB/565 256 x 256): 3804.9 images/sec, 475.6 MB/sec
GetTexImage(RGB/565 256 x 256): 99.5 images/sec, 12.4 MB/sec
becomes
TexImage(RGB/565 256 x 256): 3439.1 images/sec, 429.9 MB/sec
TexSubImage(RGB/565 256 x 256): 3744.1 images/sec, 468.0 MB/sec
GetTexImage(RGB/565 256 x 256): 4713.5 images/sec, 589.2 MB/sec
on a puny Baytrail which is still far from what it is capable of. The
reason for the disparity is that the teximage demo uses a busy texture
which is performs an accelerated pixel conversion from the user's B5G6R5
into the native X8B8G8R8. After the patch, no conversion is required
allowing use of the blitter and memcpy fast paths.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
src/mesa/main/texformat.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/src/mesa/main/texformat.c b/src/mesa/main/texformat.c
index fd9f335..866c7b3 100644
--- a/src/mesa/main/texformat.c
+++ b/src/mesa/main/texformat.c
@@ -114,6 +114,8 @@ _mesa_choose_tex_format(struct gl_context *ctx, GLenum
target,
case GL_RGB:
if (type == GL_UNSIGNED_INT_2_10_10_10_REV) {
RETURN_IF_SUPPORTED(MESA_FORMAT_B10G10R10A2_UNORM);
+ } else if (type == GL_UNSIGNED_SHORT_5_6_5) {
+ RETURN_IF_SUPPORTED(MESA_FORMAT_B5G6R5_UNORM);
}
/* fallthrough */
case GL_RGB8:
--
2.5.1
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