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-rw-r--r--src/mesa/swrast/s_triangle.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/mesa/swrast/s_triangle.c b/src/mesa/swrast/s_triangle.c
index 257f06c24d..01cd754e4a 100644
--- a/src/mesa/swrast/s_triangle.c
+++ b/src/mesa/swrast/s_triangle.c
@@ -798,6 +798,7 @@ fast_persp_span(GLcontext *ctx, struct sw_span *span,
*/
#define NAME persp_textured_triangle
#define INTERP_Z 1
+#define INTERP_W 1
#define INTERP_FOG 1
#define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
#define INTERP_RGB 1