Henri Verbeet : wined3d: Handle a zero source value for WINED3DSIH_RSQ.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: adf4ca2e23873811a22fc82022f5d7753e9d569a
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=adf4ca2e23873811a22fc82022f5d7753e9d569a

Author: Henri Verbeet <hverbeet at codeweavers.com>
Date:   Mon Feb  1 13:52:58 2010 +0100

wined3d: Handle a zero source value for WINED3DSIH_RSQ.

---

 dlls/wined3d/glsl_shader.c |   13 +++++++++----
 1 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/dlls/wined3d/glsl_shader.c b/dlls/wined3d/glsl_shader.c
index ba16cae..6357e06 100644
--- a/dlls/wined3d/glsl_shader.c
+++ b/dlls/wined3d/glsl_shader.c
@@ -2253,10 +2253,15 @@ static void shader_glsl_rsq(const struct wined3d_shader_instruction *ins)
 
     shader_glsl_add_src_param(ins, &ins->src[0], WINED3DSP_WRITEMASK_3, &src_param);
 
-    if (mask_size > 1) {
-        shader_addline(buffer, "vec%d(inversesqrt(%s)));\n", mask_size, src_param.param_str);
-    } else {
-        shader_addline(buffer, "inversesqrt(%s));\n", src_param.param_str);
+    if (mask_size > 1)
+    {
+        shader_addline(buffer, "vec%d(%s == 0.0 ? FLT_MAX : inversesqrt(%s)));\n",
+                mask_size, src_param.param_str, src_param.param_str);
+    }
+    else
+    {
+        shader_addline(buffer, "%s == 0.0 ? FLT_MAX : inversesqrt(%s));\n",
+                src_param.param_str, src_param.param_str);
     }
 }