1 /* Copyright © 2013, Intel Corporation
3 * Permission is hereby granted, free of charge, to any person obtaining a copy
4 * of this software and associated documentation files (the "Software"), to deal
5 * in the Software without restriction, including without limitation the rights
6 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7 * copies of the Software, and to permit persons to whom the Software is
8 * furnished to do so, subject to the following conditions:
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
18 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
25 /* Perform dynamic lookup of 'function' within the library specified
26 * by the GLAZE_LIBGL environment variable.
29 glaze_lookup (char *function);
31 /* A helper macro for glaze-using wrappers to defer an operation to
32 * the "real" underlying OpenGL function.
34 * The underlying function to be called will be obtained by calling
35 * glaze_lookup. This lookup will be cached in a local variable
36 * (defined by this macro) named real_<function>.
38 * NOTE: This macro can only be used a single time within any
39 * function, (due to the locally-defined variable). If this is
40 * inadequate, callers can instead call glaze_lookup manually.
42 #define GLAZE_DEFER(function,...) do { \
43 static typeof(&function) real_ ## function; \
44 if (! real_ ## function) \
45 real_ ## function = glaze_lookup (#function); \
46 real_ ## function(__VA_ARGS__); \
49 /* As GLAZE_DEFER, but also set 'ret' to the value returned by the
50 * underlying "real" function. */
51 #define GLAZE_DEFER_WITH_RETURN(ret, function,...) do { \
52 static typeof(&function) real_ ## function; \
53 if (! real_ ## function) \
54 real_ ## function = glaze_lookup (#function); \
55 (ret) = real_ ## function(__VA_ARGS__); \