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/*
* Mesa 3-D graphics library
* Version: 7.1
*
* Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/**
* \mainpage Mesa GL API Module
*
* \section GLAPIIntroduction Introduction
*
* The Mesa GL API module is responsible for dispatching all the
* gl*() functions. All GL functions are dispatched by jumping through
* the current dispatch table (basically a struct full of function
* pointers.)
*
* A per-thread current dispatch table and per-thread current context
* pointer are managed by this module too.
*
* This module is intended to be non-Mesa-specific so it can be used
* with the X/DRI libGL also.
*/
#ifndef _GLAPI_H
#define _GLAPI_H
#include "glthread.h"
struct _glapi_table;
typedef void (*_glapi_proc)(void); /* generic function pointer */
#if defined(USE_MGL_NAMESPACE)
#define _glapi_set_dispatch _mglapi_set_dispatch
#define _glapi_get_dispatch _mglapi_get_dispatch
#define _glapi_set_context _mglapi_set_context
#define _glapi_get_context _mglapi_get_context
#define _glapi_Dispatch _mglapi_Dispatch
#define _glapi_Context _mglapi_Context
#endif
#if defined(__GNUC__) && (__GNUC__ >= 3)
# define likely(x) __builtin_expect(!!(x), 1)
# define unlikely(x) __builtin_expect(!!(x), 0)
#else
# define likely(x) (x)
# define unlikely(x) (x)
#endif
/**
** Define the GET_DISPATCH() and GET_CURRENT_CONTEXT() macros.
**
** \param C local variable which will hold the current context.
**/
#if defined (GLX_USE_TLS)
extern const struct _glapi_table *_glapi_Dispatch;
extern const void *_glapi_Context;
extern __thread struct _glapi_table * _glapi_tls_Dispatch
__attribute__((tls_model("initial-exec")));
extern __thread void * _glapi_tls_Context
__attribute__((tls_model("initial-exec")));
# define GET_DISPATCH() _glapi_tls_Dispatch
# define GET_CURRENT_CONTEXT(C) GLcontext *C = (GLcontext *) _glapi_tls_Context
#else
extern struct _glapi_table *_glapi_Dispatch;
extern void *_glapi_Context;
# ifdef THREADS
# define GET_DISPATCH() \
(likely(_glapi_Dispatch) ? _glapi_Dispatch : _glapi_get_dispatch())
# define GET_CURRENT_CONTEXT(C) GLcontext *C = (GLcontext *) \
(likely(_glapi_Context) ? _glapi_Context : _glapi_get_context())
# else
# define GET_DISPATCH() _glapi_Dispatch
# define GET_CURRENT_CONTEXT(C) GLcontext *C = (GLcontext *) _glapi_Context
# endif
#endif /* defined (GLX_USE_TLS) */
/**
** GL API public functions
**/
extern void
_glapi_init_multithread(void);
extern void
_glapi_destroy_multithread(void);
extern void
_glapi_check_multithread(void);
extern void
_glapi_set_context(void *context);
extern void *
_glapi_get_context(void);
extern void
_glapi_set_dispatch(struct _glapi_table *dispatch);
extern struct _glapi_table *
_glapi_get_dispatch(void);
extern unsigned int
_glapi_get_dispatch_table_size(void);
extern int
_glapi_add_dispatch( const char * const * function_names,
const char * parameter_signature );
extern int
_glapi_get_proc_offset(const char *funcName);
extern _glapi_proc
_glapi_get_proc_address(const char *funcName);
/**
* GL API local functions and defines
*/
extern void
init_glapi_relocs_once(void);
extern void
_glapi_check_table_not_null(const struct _glapi_table *table);
extern void
_glapi_check_table(const struct _glapi_table *table);
extern const char *
_glapi_get_proc_name(unsigned int offset);
/*
* Number of extension functions which we can dynamically add at runtime.
*/
#define MAX_EXTENSION_FUNCS 300
#endif
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