d3d10/effect: Fix index access in GetBlendState().

dlls/d3d10/effect.c

@@ -8531,17 +8531,15 @@ static HRESULT STDMETHODCALLTYPE d3d10_effect_blend_variable_GetBlendState(ID3D1
 
     TRACE("iface %p, index %u, blend_state %p.\n", iface, index, blend_state);
 
-    if (v->type->element_count)
-        v = impl_from_ID3D10EffectVariable(iface->lpVtbl->GetElement(iface, index));
-    else if (index)
-        return E_FAIL;
-
-    if (v->type->basetype != D3D10_SVT_BLEND)
+    if (!iface->lpVtbl->IsValid(iface))
     {
-        WARN("Variable is not a blend state.\n");
+        WARN("Invalid variable.\n");
         return E_FAIL;
     }
 
+    if (!(v = d3d10_get_state_variable(v, index, &v->effect->blend_states)))
+        return E_FAIL;
+
     if ((*blend_state = v->u.state.object.blend))
         ID3D10BlendState_AddRef(*blend_state);
 

dlls/d3d10/tests/effect.c

@@ -4530,8 +4530,22 @@ static void test_effect_state_groups(void)
             blend_desc.RenderTargetWriteMask[0]);
     ok(blend_desc.RenderTargetWriteMask[7] == 0x7, "Got unexpected RenderTargetWriteMask[7] %#x.\n",
             blend_desc.RenderTargetWriteMask[7]);
+    hr = b->lpVtbl->GetBlendState(b, 0, &blend_state);
+    ok(hr == S_OK, "Unexpected hr %#x.\n", hr);
+    ID3D10BlendState_GetDesc(blend_state, &blend_desc);
+    ok(blend_desc.SrcBlend == D3D10_BLEND_ONE, "Got unexpected SrcBlend %#x.\n", blend_desc.SrcBlend);
+    ID3D10BlendState_Release(blend_state);
     b->lpVtbl->GetBackingStore(b, 1, &blend_desc);
     ok(blend_desc.SrcBlend == D3D10_BLEND_SRC_COLOR, "Got unexpected SrcBlend %#x.\n", blend_desc.SrcBlend);
+    hr = b->lpVtbl->GetBlendState(b, 1, &blend_state);
+    ok(hr == S_OK, "Unexpected hr %#x.\n", hr);
+    ID3D10BlendState_GetDesc(blend_state, &blend_desc);
+    /* We can't check the SrcBlend value from the ID3D10BlendState object
+     * descriptor because BlendEnable[0] is effectively false, which forces
+     * normalization of all the other descriptor values. We can at least
+     * confirm that we got blend_state2 by checking BlendEnable[0] itself. */
+    ok(!blend_desc.BlendEnable[0], "Got unexpected BlendEnable[0] %#x.\n", blend_desc.BlendEnable[0]);
+    ID3D10BlendState_Release(blend_state);
 
     v = effect->lpVtbl->GetVariableByName(effect, "ds_state");
     d = v->lpVtbl->AsDepthStencil(v);