https://bugs.freedesktop.org/show_bug.cgi?id=41263
--- Comment #5 from Simon Farnsworth <simon.farnswo...@onelan.co.uk> 2011-09-29
02:21:41 PDT ---
I've now updated mesa to git revision e112287474e225969fb10e6bc744d9c48a853fc6
I added the following to that file, to clue me in when software fallbacks
happen (with apologies for line wrapping):
commit 550cf15bb2ba564a927bd4bfba5a85623636caef
Author: Simon Farnsworth <simon.farnswo...@onelan.co.uk>
Date: Tue Sep 27 14:42:12 2011 +0100
Debug patch
diff --git a/src/mesa/state_tracker/st_cb_texture.c
b/src/mesa/state_tracker/st_cb_texture.c
index e744a9f..3208ac6 100644
--- a/src/mesa/state_tracker/st_cb_texture.c
+++ b/src/mesa/state_tracker/st_cb_texture.c
@@ -1619,6 +1619,22 @@ st_copy_texsubimage(struct gl_context *ctx,
}
if (use_fallback) {
+ debug_printf("%s: software fallback ctx->_ImageTransferState %d
matching_base_formats %d src_format 0x%x dest_format 0x%x do_flip %d
format_writemask 0x%x texBaseFormat 0x%x sampler_supported %d render_supported
%d\n",
+ __FUNCTION__,
+ ctx->_ImageTransferState,
+ matching_base_formats,
+ src_format,
+ dest_format,
+ do_flip,
+ format_writemask,
+ texBaseFormat,
+ screen->is_format_supported(screen, src_format,
+ PIPE_TEXTURE_2D, sample_count,
+ PIPE_BIND_SAMPLER_VIEW) &&
+ screen->is_format_supported(screen, dest_format,
+ PIPE_TEXTURE_2D, 0,
+ PIPE_BIND_RENDER_TARGET)
+ );
/* software fallback */
fallback_copy_texsubimage(ctx, target, level,
strb, stImage, texBaseFormat,
The output I get is
st_copy_texsubimage: software fallback ctx->_ImageTransferState 0
matching_base_formats 0 src_format 0x1 dest_format 0x2 do_flip 0
format_writemask 0x0 texBaseFormat 0x1907 sampler_supported 1 render_supported
164514680
I can't use the first path (identical formats), as src_format != dest_format,
and matching_base_formats is false.
compatible_src_dst_formats has returned 0, so I can't use the textured quad
path.
I therefore fall back to software unexpectedly.
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