Alexander Dorofeyev : wined3d: Add zero/near zero vertex rhw special case.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 1e23602d4bc93ebf609c2a6d99654e2bf3996786
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=1e23602d4bc93ebf609c2a6d99654e2bf3996786

Author: Alexander Dorofeyev <alexd4 at inbox.lv>
Date:   Tue Dec 25 00:18:21 2007 -0800

wined3d: Add zero/near zero vertex rhw special case.

---

 dlls/wined3d/directx.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/dlls/wined3d/directx.c b/dlls/wined3d/directx.c
index 9e6bf33..9536b71 100644
--- a/dlls/wined3d/directx.c
+++ b/dlls/wined3d/directx.c
@@ -2906,9 +2906,14 @@ static void position_d3dcolor(void *data) {
 }
 static void position_float4(void *data) {
     GLfloat *pos = (float *) data;
-    float w = 1.0 / pos[3];
 
-    glVertex4f(pos[0] * w, pos[1] * w, pos[2] * w, w);
+    if (pos[3] < eps && pos[3] > -eps)
+        glVertex3fv(pos);
+    else {
+        float w = 1.0 / pos[3];
+
+        glVertex4f(pos[0] * w, pos[1] * w, pos[2] * w, w);
+    }
 }
 
 static void diffuse_d3dcolor(void *data) {