From: Keith Whitwell <keithw@vmware.com>
Date: Fri, 20 Aug 2010 15:18:23 +0000 (+0100)
Subject: llvmpipe: cull zero-area triangles early
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=c25151dd6a06acd93c8bf0d9e79fdcf134ffe818;p=mesa.git

llvmpipe: cull zero-area triangles early
---

diff --git a/src/gallium/drivers/llvmpipe/lp_setup_tri.c b/src/gallium/drivers/llvmpipe/lp_setup_tri.c
index 614a6372b42..b4325390fe7 100644
--- a/src/gallium/drivers/llvmpipe/lp_setup_tri.c
+++ b/src/gallium/drivers/llvmpipe/lp_setup_tri.c
@@ -819,9 +819,10 @@ static void triangle_both( struct lp_setup_context *setup,
    const float fy = v1[0][1] - v2[0][1];
 
    /* det = cross(e,f).z */
-   if (ex * fy - ey * fx < 0.0f) 
+   const float det = ex * fy - ey * fx;
+   if (det < 0.0f) 
       triangle_ccw( setup, v0, v1, v2 );
-   else
+   else if (det > 0.0f)
       triangle_cw( setup, v0, v1, v2 );
 }