Mesa (7.8): softpipe: Fix division by zero

[Brian Paul]

Module: Mesa
Branch: 7.8
Commit: b3a68cdc6f4bf2c006aa01f8980536e8e520d62a
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=b3a68cdc6f4bf2c006aa01f8980536e8e520d62a

Author: Arpad Borsos <arpad.borsos at googlemail.com>
Date:   Wed Apr 14 14:26:32 2010 -0600

softpipe: Fix division by zero

This can be triggered by running the cairo tests using the gl backend
and softpipe.

Signed-off-by: Brian Paul <brianp at vmware.com>

---

 src/gallium/drivers/softpipe/sp_setup.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/gallium/drivers/softpipe/sp_setup.c b/src/gallium/drivers/softpipe/sp_setup.c
index 85966bc..e64aee6 100644
--- a/src/gallium/drivers/softpipe/sp_setup.c
+++ b/src/gallium/drivers/softpipe/sp_setup.c
@@ -669,17 +669,17 @@ static void setup_tri_edges( struct setup_context *setup )
 
    setup->emaj.sy = ceilf(vmin_y);
    setup->emaj.lines = (int) ceilf(vmax_y - setup->emaj.sy);
-   setup->emaj.dxdy = setup->emaj.dx / setup->emaj.dy;
+   setup->emaj.dxdy = setup->emaj.dy ? setup->emaj.dx / setup->emaj.dy : .0f;
    setup->emaj.sx = vmin_x + (setup->emaj.sy - vmin_y) * setup->emaj.dxdy;
 
    setup->etop.sy = ceilf(vmid_y);
    setup->etop.lines = (int) ceilf(vmax_y - setup->etop.sy);
-   setup->etop.dxdy = setup->etop.dx / setup->etop.dy;
+   setup->etop.dxdy = setup->etop.dy ? setup->etop.dx / setup->etop.dy : .0f;
    setup->etop.sx = vmid_x + (setup->etop.sy - vmid_y) * setup->etop.dxdy;
 
    setup->ebot.sy = ceilf(vmin_y);
    setup->ebot.lines = (int) ceilf(vmid_y - setup->ebot.sy);
-   setup->ebot.dxdy = setup->ebot.dx / setup->ebot.dy;
+   setup->ebot.dxdy = setup->ebot.dy ? setup->ebot.dx / setup->ebot.dy : .0f;
    setup->ebot.sx = vmin_x + (setup->ebot.sy - vmin_y) * setup->ebot.dxdy;
 }