From: José Fonseca <jfonseca@vmware.com>
Date: Sun, 18 Apr 2010 07:48:55 +0000 (+0200)
Subject: softpipe: Preserve/check the signal of the number of scanlines in an edge.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=4272c01fbfd42833e4e0937bed84e45fe5da52b9;p=mesa.git

softpipe: Preserve/check the signal of the number of scanlines in an edge.

It can become negative in some weird triangles.
---

diff --git a/src/gallium/drivers/softpipe/sp_setup.c b/src/gallium/drivers/softpipe/sp_setup.c
index 85966bc5e49..e136cb7cf73 100644
--- a/src/gallium/drivers/softpipe/sp_setup.c
+++ b/src/gallium/drivers/softpipe/sp_setup.c
@@ -691,7 +691,7 @@ static void setup_tri_edges( struct setup_context *setup )
 static void subtriangle( struct setup_context *setup,
 			 struct edge *eleft,
 			 struct edge *eright,
-			 unsigned lines )
+			 int lines )
 {
    const struct pipe_scissor_state *cliprect = &setup->softpipe->cliprect;
    const int minx = (int) cliprect->minx;
@@ -702,6 +702,7 @@ static void subtriangle( struct setup_context *setup,
    int sy = (int)eleft->sy;
 
    assert((int)eleft->sy == (int) eright->sy);
+   assert(lines >= 0);
 
    /* clip top/bottom */
    start_y = sy;