From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Tue, 28 Feb 2006 15:48:43 +0000 (+0000)
Subject: only run shader on active fragments in the span
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=176dac684a65d9140d3f1ce4d3bd4220ff5b653f;p=mesa.git

only run shader on active fragments in the span
---

diff --git a/src/mesa/swrast/s_arbshader.c b/src/mesa/swrast/s_arbshader.c
index e17e799100e..c915b97d6ec 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]);
 		}
+            }
 	}
 }