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authorBrian Paul <brianp@vmware.com>2010-04-20 11:43:58 -0600
committerBrian Paul <brianp@vmware.com>2010-04-20 11:44:01 -0600
commitdb4ccc004a96255f3ad0dc26467f2243a133c24b (patch)
tree1783c640ef63a8549ce22c03b4106d56c4a626ec /src
parentab065b933bde4fd1079f0d37a4571cdfd1619407 (diff)
llvmpipe: fix incorrect front-facing value for fragment shader
The TGSI convention is +1 for front-facing, -1 for back-facing Fixes glean glsl1 gl_FrontFacing tests.
Diffstat (limited to 'src')
-rw-r--r--src/gallium/drivers/llvmpipe/lp_setup_tri.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/src/gallium/drivers/llvmpipe/lp_setup_tri.c b/src/gallium/drivers/llvmpipe/lp_setup_tri.c
index a95053444bf..f8a58165733 100644
--- a/src/gallium/drivers/llvmpipe/lp_setup_tri.c
+++ b/src/gallium/drivers/llvmpipe/lp_setup_tri.c
@@ -163,12 +163,17 @@ setup_fragcoord_coef(struct lp_setup_context *setup,
}
+/**
+ * Setup the fragment input attribute with the front-facing value.
+ * \param frontface is the triangle front facing?
+ */
static void setup_facing_coef( struct lp_setup_context *setup,
struct lp_rast_triangle *tri,
unsigned slot,
boolean frontface )
{
- constant_coef( setup, tri, slot, 1.0f - frontface, 0 );
+ /* convert TRUE to 1.0 and FALSE to -1.0 */
+ constant_coef( setup, tri, slot, 2.0f * frontface - 1.0f, 0 );
constant_coef( setup, tri, slot, 0.0f, 1 ); /* wasted */
constant_coef( setup, tri, slot, 0.0f, 2 ); /* wasted */
constant_coef( setup, tri, slot, 0.0f, 3 ); /* wasted */