From: Brian Paul <bri...@vmware.com>
The 1-bit alpha channel was incorrectly encoded. Previously, any non-zero
alpha value for the ubyte alpha value would set A=1. Instead, use the
most significant bit of the ubyte alpha to determine the A bit. This is
consistent with the other channels and other OpenGL implementations.
---
src/mesa/main/colormac.h | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/src/mesa/main/colormac.h b/src/mesa/main/colormac.h
index 0b8864a..4294f32 100644
--- a/src/mesa/main/colormac.h
+++ b/src/mesa/main/colormac.h
@@ -74,11 +74,11 @@ _mesa_unclamped_float_rgba_to_ubyte(GLubyte dst[4], const
GLfloat src[4])
#define PACK_COLOR_5551( R, G, B, A ) \
((((R) & 0xf8) << 8) | (((G) & 0xf8) << 3) | (((B) & 0xf8) >> 2) | \
- ((A) ? 1 : 0))
+ ((A) >> 7))
#define PACK_COLOR_1555( A, B, G, R ) \
((((B) & 0xf8) << 7) | (((G) & 0xf8) << 2) | (((R) & 0xf8) >> 3) | \
- ((A) ? 0x8000 : 0))
+ (((A) & 0x80) << 8))
#define PACK_COLOR_1555_REV( A, B, G, R )
\
((((B) & 0xf8) >> 1) | (((G) & 0xc0) >> 6) | (((G) & 0x38) << 10) | (((R) &
0xf8) << 5) | \
--
1.7.3.4
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