d3d10/effect: Fix iteration in GetBackingStore() for rasterizer states.

dlls/d3d10/effect.c

@@ -9037,21 +9037,20 @@ static HRESULT STDMETHODCALLTYPE d3d10_effect_rasterizer_variable_GetBackingStor
 
     TRACE("iface %p, index %u, desc %p.\n", iface, index, desc);
 
-    if (v->type->element_count)
-        v = impl_from_ID3D10EffectVariable(iface->lpVtbl->GetElement(iface, index));
-
-    if (v->type->basetype != D3D10_SVT_RASTERIZER)
+    if (!iface->lpVtbl->IsValid(iface))
     {
-        WARN("Variable is not a rasterizer state.\n");
+        WARN("Invalid variable.\n");
         return E_FAIL;
     }
 
+    if (!(v = d3d10_get_state_variable(v, index, &v->effect->rs_states)))
+        return E_FAIL;
+
     *desc = v->u.state.desc.rasterizer;
 
     return S_OK;
 }
 
-
 static const struct ID3D10EffectRasterizerVariableVtbl d3d10_effect_rasterizer_variable_vtbl =
 {
     /* ID3D10EffectVariable methods */

dlls/d3d10/tests/effect.c

@@ -4567,6 +4567,8 @@ static void test_effect_state_groups(void)
     ok(rast_desc.MultisampleEnable, "Got unexpected MultisampleEnable %#x.\n", rast_desc.MultisampleEnable);
     ok(rast_desc.AntialiasedLineEnable, "Got unexpected AntialiasedLineEnable %#x.\n",
             rast_desc.AntialiasedLineEnable);
+    r->lpVtbl->GetBackingStore(r, 1, &rast_desc);
+    ok(rast_desc.CullMode == D3D10_CULL_BACK, "Got unexpected CullMode %#x.\n", rast_desc.CullMode);
 
     technique = effect->lpVtbl->GetTechniqueByName(effect, "tech0");
     ok(technique->lpVtbl->IsValid(technique), "Expected valid technique.\n");