wined3d: Use INFINITY.

dlls/wined3d/state.c

@@ -1049,7 +1049,7 @@ void state_fogstartend(struct wined3d_context *context, const struct wined3d_sta
             fogend = tmpvalue.f;
             /* In GL, fogstart == fogend disables fog, in D3D everything's fogged.*/
             if(fogstart == fogend) {
-                fogstart = -1.0f / 0.0f;
+                fogstart = -INFINITY;
                 fogend = 0.0f;
             }
             break;

dlls/wined3d/wined3d_private.h

@@ -199,7 +199,7 @@ static inline float float_16_to_32(const unsigned short *in) {
     } else if(e < 31) {
         return sgn * powf(2, (float)e - 15.0f) * (1.0f + ((float)m / 1024.0f));
     } else {
-        if(m == 0) return sgn / 0.0f; /* +INF / -INF */
+        if(m == 0) return sgn * INFINITY;
         else return NAN;
     }
 }
@@ -221,7 +221,7 @@ static inline float float_24_to_32(DWORD in)
     }
     else
     {
-        if (m == 0) return sgn / 0.0f; /* +INF / -INF */
+        if (m == 0) return sgn * INFINITY;
         else return NAN;
     }
 }