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-rw-r--r--src/mesa/swrast/s_span.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/mesa/swrast/s_span.c b/src/mesa/swrast/s_span.c
index 0b17791567a..097d2c7b51c 100644
--- a/src/mesa/swrast/s_span.c
+++ b/src/mesa/swrast/s_span.c
@@ -1357,7 +1357,11 @@ shade_texture_span(GLcontext *ctx, SWspan *span)
if ((inputsRead >= FRAG_BIT_VAR0) && (span->interpMask & SPAN_VARYING))
interpolate_varying(ctx, span);
+#if 0
if (inputsRead & FRAG_BIT_WPOS)
+#else
+ /* XXX always interpolate wpos so that DDX/DDY work */
+#endif
interpolate_wpos(ctx, span);
/* Run fragment program/shader now */