wined3d: Use the "sysval_semantic" field instead of "semantic_name" to recognize SV_POSITION.

dlls/wined3d/glsl_shader.c

@@ -4167,7 +4167,7 @@ static void shader_glsl_input_pack(const struct wined3d_shader *shader, struct w
 
         if (vertexprocessing == vertexshader)
         {
-            if (!strcmp(semantic_name, "SV_POSITION") && !semantic_idx)
+            if (input->sysval_semantic == WINED3D_SV_POSITION)
                 shader_addline(buffer, "ps_in[%u]%s = vpos%s;\n",
                         shader->u.ps.input_reg_map[input->register_idx], reg_mask, reg_mask);
             else

dlls/wined3d/shader.c

@@ -1045,7 +1045,7 @@ static HRESULT shader_get_registers_used(struct wined3d_shader *shader, const st
         {
             reg_maps->input_registers |= 1 << input_signature->elements[i].register_idx;
             if (shader_version.type == WINED3D_SHADER_TYPE_PIXEL
-                    && !strcmp(input_signature->elements[i].semantic_name, "SV_POSITION"))
+                    && input_signature->elements[i].sysval_semantic == WINED3D_SV_POSITION)
                 reg_maps->vpos = 1;
         }
     }

include/wine/wined3d.h

@@ -767,6 +767,8 @@ enum wined3d_decl_usage
 
 enum wined3d_sysval_semantic
 {
+    WINED3D_SV_POSITION = 1,
+
     WINED3D_SV_DEPTH = 0xffffffff,
     WINED3D_SV_TARGET0 = 0,
     WINED3D_SV_TARGET1 = 1,