wined3d: Set fixed_function_usage_map to 0 for an sm4 draw without a PS.

dlls/wined3d/context_gl.c

@@ -3735,12 +3735,26 @@ static void context_invalidate_texture_stage(struct wined3d_context *context, DW
         context_invalidate_state(context, STATE_TEXTURESTAGE(stage, i));
 }
 
+static bool use_ffp_ps(const struct wined3d_state *state)
+{
+    struct wined3d_shader *vs = state->shader[WINED3D_SHADER_TYPE_VERTEX];
+
+    if (!use_vs(state))
+        return true;
+    if (vs && vs->reg_maps.shader_version.major >= 4)
+        return false;
+    return true;
+}
+
 static void context_update_fixed_function_usage_map(struct wined3d_context *context,
         const struct wined3d_state *state)
 {
-    UINT i, start, end;
+    UINT i = 0, start, end;
 
     context->fixed_function_usage_map = 0;
+
+    if (use_ffp_ps(state))
+    {
         for (i = 0; i < WINED3D_MAX_FFP_TEXTURES; ++i)
         {
             enum wined3d_texture_op color_op = state->texture_states[i][WINED3D_TSS_COLOR_OP];
@@ -3770,6 +3784,7 @@ static void context_update_fixed_function_usage_map(struct wined3d_context *cont
                     && i < WINED3D_MAX_FFP_TEXTURES - 1)
                 context->fixed_function_usage_map |= (1u << (i + 1));
         }
+    }
 
     if (i < context->lowest_disabled_stage)
     {