[Mesa-dev] [PATCH] r300g: Fix the ATI1N swizzle.

[Stefan Dösinger]

This fixes the GL_COMPRESSED_RED_RGTC1 part of piglit's rgtc-teximage-01
test as well as the precision part of Wine's 3dc format test (fd.o bug
89156).

The Z component seems to contain a lower precision version of the
result, probably a temporary value from the decompression computation.
The Y and W component contain different data that depends on the input
values as well, but I could not make sense of them (Not that I tried
very hard).

GL_COMPRESSED_SIGNED_RED_RGTC1 still seems to have precision problems in
piglit, and both formats are affected by a compiler bug if they're
sampled by the shader with a swizzle other than .xyzw. Wine uses .xxxx,
which returns random garbage.
---
 src/gallium/drivers/r300/r300_texture.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/gallium/drivers/r300/r300_texture.c b/src/gallium/drivers/r300/r300_texture.c
index ffe8c00..340b8fc 100644
--- a/src/gallium/drivers/r300/r300_texture.c
+++ b/src/gallium/drivers/r300/r300_texture.c
@@ -176,7 +176,9 @@ uint32_t r300_translate_texformat(enum pipe_format format,
             format != PIPE_FORMAT_RGTC2_UNORM &&
             format != PIPE_FORMAT_RGTC2_SNORM &&
             format != PIPE_FORMAT_LATC2_UNORM &&
-            format != PIPE_FORMAT_LATC2_SNORM) {
+            format != PIPE_FORMAT_LATC2_SNORM &&
+            format != PIPE_FORMAT_RGTC1_UNORM &&
+            format != PIPE_FORMAT_LATC1_UNORM) {
             result |= r300_get_swizzle_combined(desc->swizzle, swizzle_view,
                                                 TRUE);
         } else {
-- 
2.0.5