From 176dac684a65d9140d3f1ce4d3bd4220ff5b653f Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Tue, 28 Feb 2006 15:48:43 +0000
Subject: only run shader on active fragments in the span

---
 src/mesa/swrast/s_arbshader.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src/mesa')

diff --git a/src/mesa/swrast/s_arbshader.c b/src/mesa/swrast/s_arbshader.c
index e17e799100..c915b97d6e 100644
--- a/src/mesa/swrast/s_arbshader.c
+++ b/src/mesa/swrast/s_arbshader.c
@@ -46,6 +46,8 @@ void _swrast_exec_arbshader (GLcontext *ctx, struct sw_span *span)
 
 	for (i = span->start; i < span->end; i++)
 	{
+            /* only run shader on active fragments */
+            if (span->array->mask[i]) {
 		GLfloat vec[4];
 		GLuint j;
 		GLboolean discard;
@@ -89,6 +91,7 @@ void _swrast_exec_arbshader (GLcontext *ctx, struct sw_span *span)
 			UNCLAMPED_FLOAT_TO_CHAN(span->array->rgba[i][BCOMP], vec[2]);
 			UNCLAMPED_FLOAT_TO_CHAN(span->array->rgba[i][ACOMP], vec[3]);
 		}
+            }
 	}
 }
 
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