[PATCH 2/8] wined3d: Avoid potential division by 0 when computing fog scale.

[Matteo Bruni]

FPU exceptions are usually masked in D3D and fog start and end don't
normally match but apparently there are some real cases where the
planets align.
---
 dlls/wined3d/glsl_shader.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dlls/wined3d/glsl_shader.c b/dlls/wined3d/glsl_shader.c
index 37a8f87..109184d 100644
--- a/dlls/wined3d/glsl_shader.c
+++ b/dlls/wined3d/glsl_shader.c
@@ -1250,7 +1250,7 @@ static void shader_glsl_load_fog_uniform(const struct wined3d_context *context,
     tmpvalue.d = state->render_states[WINED3D_RS_FOGDENSITY];
     GL_EXTCALL(glUniform1f(prog->ps.fog_density_location, tmpvalue.f));
     get_fog_start_end(context, state, &start, &end);
-    scale = 1.0f / (end - start);
+    scale = end == start ? INFINITY : 1.0f / (end - start);
     GL_EXTCALL(glUniform1f(prog->ps.fog_end_location, end));
     GL_EXTCALL(glUniform1f(prog->ps.fog_scale_location, scale));
     checkGLcall("fog emulation uniforms");
-- 
2.3.6