2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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27 * \mainpage Mesa GL API Module
29 * \section GLAPIIntroduction Introduction
31 * The Mesa GL API module is responsible for dispatching all the
32 * gl*() functions. All GL functions are dispatched by jumping through
33 * the current dispatch table (basically a struct full of function
36 * A per-thread current dispatch table and per-thread current context
37 * pointer are managed by this module too.
39 * This module is intended to be non-Mesa-specific so it can be used
40 * with the X/DRI libGL also.
52 typedef void (*_glapi_proc
)(void); /* generic function pointer */
55 #if defined(USE_MGL_NAMESPACE)
56 #define _glapi_set_dispatch _mglapi_set_dispatch
57 #define _glapi_get_dispatch _mglapi_get_dispatch
58 #define _glapi_set_context _mglapi_set_context
59 #define _glapi_get_context _mglapi_get_context
60 #define _glapi_Dispatch _mglapi_Dispatch
61 #define _glapi_Context _mglapi_Context
66 # define likely(x) __builtin_expect(!!(x), 1)
67 # define unlikely(x) __builtin_expect(!!(x), 0)
69 # define likely(x) (x)
70 # define unlikely(x) (x)
75 ** Define the GET_DISPATCH() and GET_CURRENT_CONTEXT() macros.
77 ** \param C local variable which will hold the current context.
79 #if defined (GLX_USE_TLS)
81 extern const struct _glapi_table
*_glapi_Dispatch
;
83 extern const void *_glapi_Context
;
85 extern __thread
struct _glapi_table
* _glapi_tls_Dispatch
86 __attribute__((tls_model("initial-exec")));
88 extern __thread
void * _glapi_tls_Context
89 __attribute__((tls_model("initial-exec")));
91 # define GET_DISPATCH() _glapi_tls_Dispatch
93 # define GET_CURRENT_CONTEXT(C) GLcontext *C = (GLcontext *) _glapi_tls_Context
97 extern struct _glapi_table
*_glapi_Dispatch
;
99 extern void *_glapi_Context
;
103 # define GET_DISPATCH() \
104 (likely(_glapi_Dispatch) ? _glapi_Dispatch : _glapi_get_dispatch())
106 # define GET_CURRENT_CONTEXT(C) GLcontext *C = (GLcontext *) \
107 (likely(_glapi_Context) ? _glapi_Context : _glapi_get_context())
111 # define GET_DISPATCH() _glapi_Dispatch
113 # define GET_CURRENT_CONTEXT(C) GLcontext *C = (GLcontext *) _glapi_Context
117 #endif /* defined (GLX_USE_TLS) */
121 ** GL API public functions
125 _glapi_init_multithread(void);
129 _glapi_destroy_multithread(void);
133 _glapi_check_multithread(void);
137 _glapi_set_context(void *context
);
141 _glapi_get_context(void);
145 _glapi_set_dispatch(struct _glapi_table
*dispatch
);
148 extern struct _glapi_table
*
149 _glapi_get_dispatch(void);
153 _glapi_get_dispatch_table_size(void);
157 _glapi_add_dispatch( const char * const * function_names
,
158 const char * parameter_signature
);
161 _glapi_get_proc_offset(const char *funcName
);
165 _glapi_get_proc_address(const char *funcName
);
169 _glapi_get_proc_name(unsigned int offset
);