Because the type of the facing attribute is unsigned, the whole computation was
done in the unsigned range.
Fixes fbo-fragcoord2, glsl1-gl_FrontFacing var (2) and glsl-fs-frontfacing
tests.
---
src/gallium/drivers/softpipe/sp_fs_exec.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/src/gallium/drivers/softpipe/sp_fs_exec.c
b/src/gallium/drivers/softpipe/sp_fs_exec.c
index 779b8c4..cf19696 100644
--- a/src/gallium/drivers/softpipe/sp_fs_exec.c
+++ b/src/gallium/drivers/softpipe/sp_fs_exec.c
@@ -128,7 +128,7 @@ exec_run( const struct sp_fragment_shader_variant *var,
&machine->QuadPos);
/* convert 0 to 1.0 and 1 to -1.0 */
- machine->Face = (float) (quad->input.facing * -2 + 1);
+ machine->Face = (float) ((signed)quad->input.facing * -2 + 1);
quad->inout.mask &= tgsi_exec_machine_run( machine );
if (quad->inout.mask == 0)
--
1.7.7.1.msysgit.0
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