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Diffstat (limited to 'glx/glapi.c')
| -rw-r--r-- | glx/glapi.c | 512 |
1 files changed, 0 insertions, 512 deletions
diff --git a/glx/glapi.c b/glx/glapi.c deleted file mode 100644 index 65f3bc91b..000000000 --- a/glx/glapi.c +++ /dev/null @@ -1,512 +0,0 @@ -/* - * Mesa 3-D graphics library - * Version: 6.5 - * - * Copyright (C) 1999-2006 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. - */ - -/* - * This file manages the OpenGL API dispatch layer. There are functions - * to set/get the current dispatch table for the current thread and to - * manage registration/dispatch of dynamically added extension functions. - * - * This code was originally general enough to be shared with Mesa, but - * they diverged long ago, so this is now just enough support to make - * indirect GLX work. - */ - -#include <dix-config.h> -#include <X11/Xfuncproto.h> -#include <os.h> -#define PUBLIC _X_EXPORT - -#include <stdlib.h> -#include <string.h> -#ifdef DEBUG -#include <assert.h> -#endif - -#include "glapi.h" -#include "dispatch.h" -#include "glapitable.h" - -#define FIRST_DYNAMIC_OFFSET (sizeof(struct _glapi_table) / sizeof(void *)) - -#if defined(PTHREADS) || defined(GLX_USE_TLS) -static void init_glapi_relocs(void); -#endif - -/** - * \name Current dispatch and current context control variables - * - * Depending on whether or not multithreading is support, and the type of - * support available, several variables are used to store the current context - * pointer and the current dispatch table pointer. In the non-threaded case, - * the variables \c _glapi_Dispatch and \c _glapi_Context are used for this - * purpose. - * - * In the "normal" threaded case, the variables \c _glapi_Dispatch and - * \c _glapi_Context will be \c NULL if an application is detected as being - * multithreaded. Single-threaded applications will use \c _glapi_Dispatch - * and \c _glapi_Context just like the case without any threading support. - * When \c _glapi_Dispatch and \c _glapi_Context are \c NULL, the thread state - * data \c _gl_DispatchTSD and \c ContextTSD are used. Drivers and the - * static dispatch functions access these variables via \c _glapi_get_dispatch - * and \c _glapi_get_context. - * - * In the TLS case, the variables \c _glapi_Dispatch and \c _glapi_Context are - * hardcoded to \c NULL. Instead the TLS variables \c _glapi_tls_Dispatch and - * \c _glapi_tls_Context are used. Having \c _glapi_Dispatch and - * \c _glapi_Context be hardcoded to \c NULL maintains binary compatability - * between TLS enabled loaders and non-TLS DRI drivers. - */ -/*@{*/ -#if defined(GLX_USE_TLS) - -PUBLIC TLS struct _glapi_table * _glapi_tls_Dispatch = NULL; - -PUBLIC TLS void * _glapi_tls_Context; - -PUBLIC const struct _glapi_table *_glapi_Dispatch = NULL; -PUBLIC const void *_glapi_Context = NULL; - -#else - -#if defined(THREADS) - -_glthread_TSD _gl_DispatchTSD; /**< Per-thread dispatch pointer */ -static _glthread_TSD ContextTSD; /**< Per-thread context pointer */ - -#if defined(WIN32_THREADS) -void FreeTSD(_glthread_TSD *p); -void FreeAllTSD(void) -{ - FreeTSD(&_gl_DispatchTSD); - FreeTSD(&ContextTSD); -} -#endif /* defined(WIN32_THREADS) */ - -#endif /* defined(THREADS) */ - -PUBLIC struct _glapi_table *_glapi_Dispatch = NULL; -PUBLIC void *_glapi_Context = NULL; - -#endif /* defined(GLX_USE_TLS) */ -/*@}*/ - -/* - * xserver's gl is not multithreaded, we promise. - */ -PUBLIC void -_glapi_check_multithread(void) -{ -} - -/** - * Set the current context pointer for this thread. - * The context pointer is an opaque type which should be cast to - * void from the real context pointer type. - */ -PUBLIC void -_glapi_set_context(void *context) -{ -#if defined(GLX_USE_TLS) - _glapi_tls_Context = context; -#elif defined(THREADS) - _glthread_SetTSD(&ContextTSD, context); - _glapi_Context = context; -#else - _glapi_Context = context; -#endif -} - - - -/** - * Get the current context pointer for this thread. - * The context pointer is an opaque type which should be cast from - * void to the real context pointer type. - */ -PUBLIC void * -_glapi_get_context(void) -{ -#if defined(GLX_USE_TLS) - return _glapi_tls_Context; -#else - return _glapi_Context; -#endif -} - - - -/** - * Set the global or per-thread dispatch table pointer. - */ -PUBLIC void -_glapi_set_dispatch(struct _glapi_table *dispatch) -{ -#if defined(PTHREADS) || defined(GLX_USE_TLS) - static pthread_once_t once_control = PTHREAD_ONCE_INIT; - pthread_once( & once_control, init_glapi_relocs ); -#endif - -#if defined(GLX_USE_TLS) - _glapi_tls_Dispatch = dispatch; -#elif defined(THREADS) - _glthread_SetTSD(&_gl_DispatchTSD, (void *) dispatch); - _glapi_Dispatch = dispatch; -#else /*THREADS*/ - _glapi_Dispatch = dispatch; -#endif /*THREADS*/ -} - - - -/** - * Return pointer to current dispatch table for calling thread. - */ -PUBLIC struct _glapi_table * -_glapi_get_dispatch(void) -{ - struct _glapi_table * api; -#if defined(GLX_USE_TLS) - api = _glapi_tls_Dispatch; -#else - api = _glapi_Dispatch; -#endif - return api; -} - - - -/*** - *** The rest of this file is pretty much concerned with GetProcAddress - *** functionality. - ***/ - -#if defined(USE_X64_64_ASM) && defined(GLX_USE_TLS) -# define DISPATCH_FUNCTION_SIZE 16 -#elif defined(USE_X86_ASM) -# if defined(THREADS) && !defined(GLX_USE_TLS) -# define DISPATCH_FUNCTION_SIZE 32 -# else -# define DISPATCH_FUNCTION_SIZE 16 -# endif -#endif - - -/* The code in this file is auto-generated with Python */ -#include "glprocs.h" - - -/** - * Search the table of static entrypoint functions for the named function - * and return the corresponding glprocs_table_t entry. - */ -static const glprocs_table_t * -find_entry( const char * n ) -{ - GLuint i; - for (i = 0; static_functions[i].Name_offset >= 0; i++) { - const char *testName = gl_string_table + static_functions[i].Name_offset; - if (strcmp(testName, n) == 0) { - return &static_functions[i]; - } - } - return NULL; -} - - -/** - * Return dispatch table offset of the named static (built-in) function. - * Return -1 if function not found. - */ -static GLint -get_static_proc_offset(const char *funcName) -{ - const glprocs_table_t * const f = find_entry( funcName ); - if (f) { - return f->Offset; - } - return -1; -} - - - -/********************************************************************** - * Extension function management. - */ - -/* - * Number of extension functions which we can dynamically add at runtime. - */ -#define MAX_EXTENSION_FUNCS 300 - - -/* - * The dispatch table size (number of entries) is the size of the - * _glapi_table struct plus the number of dynamic entries we can add. - * The extra slots can be filled in by DRI drivers that register new extension - * functions. - */ -#define DISPATCH_TABLE_SIZE (sizeof(struct _glapi_table) / sizeof(void *) + MAX_EXTENSION_FUNCS) - - -/** - * Track information about a function added to the GL API. - */ -struct _glapi_function { - /** - * Name of the function. - */ - const char * name; - - /** - * Text string that describes the types of the parameters passed to the - * named function. Parameter types are converted to characters using the - * following rules: - * - 'i' for \c GLint, \c GLuint, and \c GLenum - * - 'p' for any pointer type - * - 'f' for \c GLfloat and \c GLclampf - * - 'd' for \c GLdouble and \c GLclampd - */ - const char * parameter_signature; - - /** - * Offset in the dispatch table where the pointer to the real function is - * located. If the driver has not requested that the named function be - * added to the dispatch table, this will have the value ~0. - */ - unsigned dispatch_offset; -}; - -static struct _glapi_function ExtEntryTable[MAX_EXTENSION_FUNCS]; -static GLuint NumExtEntryPoints = 0; - -/** - * Generate new entrypoint - * - * Use a temporary dispatch offset of ~0 (i.e. -1). Later, when the driver - * calls \c _glapi_add_dispatch we'll put in the proper offset. If that - * never happens, and the user calls this function, he'll segfault. That's - * what you get when you try calling a GL function that doesn't really exist. - * - * \param funcName Name of the function to create an entry-point for. - * - * \sa _glapi_add_entrypoint - */ - -static struct _glapi_function * -add_function_name( const char * funcName ) -{ - struct _glapi_function * entry = NULL; - - if (NumExtEntryPoints < MAX_EXTENSION_FUNCS) { - entry = &ExtEntryTable[NumExtEntryPoints]; - - ExtEntryTable[NumExtEntryPoints].name = strdup(funcName); - ExtEntryTable[NumExtEntryPoints].parameter_signature = NULL; - ExtEntryTable[NumExtEntryPoints].dispatch_offset = ~0; - NumExtEntryPoints++; - } - - return entry; -} - - -/** - * Fill-in the dispatch stub for the named function. - * - * This function is intended to be called by a hardware driver. When called, - * a dispatch stub may be created created for the function. A pointer to this - * dispatch function will be returned by glXGetProcAddress. - * - * \param function_names Array of pointers to function names that should - * share a common dispatch offset. - * \param parameter_signature String representing the types of the parameters - * passed to the named function. Parameter types - * are converted to characters using the following - * rules: - * - 'i' for \c GLint, \c GLuint, and \c GLenum - * - 'p' for any pointer type - * - 'f' for \c GLfloat and \c GLclampf - * - 'd' for \c GLdouble and \c GLclampd - * - * \returns - * The offset in the dispatch table of the named function. A pointer to the - * driver's implementation of the named function should be stored at - * \c dispatch_table[\c offset]. - * - * \sa glXGetProcAddress - * - * \warning - * This function can only handle up to 8 names at a time. As far as I know, - * the maximum number of names ever associated with an existing GL function is - * 4 (\c glPointParameterfSGIS, \c glPointParameterfEXT, - * \c glPointParameterfARB, and \c glPointParameterf), so this should not be - * too painful of a limitation. - * - * \todo - * Determine whether or not \c parameter_signature should be allowed to be - * \c NULL. It doesn't seem like much of a hardship for drivers to have to - * pass in an empty string. - * - * \todo - * Determine if code should be added to reject function names that start with - * 'glX'. - * - * \bug - * Add code to compare \c parameter_signature with the parameter signature of - * a static function. In order to do that, we need to find a way to \b get - * the parameter signature of a static function. - */ - -PUBLIC int -_glapi_add_dispatch( const char * const * function_names, - const char * parameter_signature ) -{ - static int next_dynamic_offset = FIRST_DYNAMIC_OFFSET; - const char * const real_sig = (parameter_signature != NULL) - ? parameter_signature : ""; - struct _glapi_function * entry[8]; - GLboolean is_static[8]; - unsigned i; - unsigned j; - int offset = ~0; - int new_offset; - - - (void) memset(is_static, 0, sizeof(is_static)); - (void) memset(entry, 0, sizeof(entry)); - - for (i = 0 ; function_names[i] != NULL ; i++) { - /* Do some trivial validation on the name of the function. */ - - if (function_names[i][0] != 'g' || function_names[i][1] != 'l') - return GL_FALSE; - - /* Determine if the named function already exists. If the function does - * exist, it must have the same parameter signature as the function - * being added. - */ - - new_offset = get_static_proc_offset(function_names[i]); - if (new_offset >= 0) { - /* FIXME: Make sure the parameter signatures match! How do we get - * FIXME: the parameter signature for static functions? - */ - - if ((offset != ~0) && (new_offset != offset)) { - return -1; - } - - is_static[i] = GL_TRUE; - offset = new_offset; - } - - for (j = 0; j < NumExtEntryPoints; j++) { - if (strcmp(ExtEntryTable[j].name, function_names[i]) == 0) { - /* The offset may be ~0 if the function name was added by - * glXGetProcAddress but never filled in by the driver. - */ - - if (ExtEntryTable[j].dispatch_offset != ~0) { - if (strcmp(real_sig, ExtEntryTable[j].parameter_signature) != 0) - return -1; - - if ((offset != ~0) && (ExtEntryTable[j].dispatch_offset != offset)) { - return -1; - } - - offset = ExtEntryTable[j].dispatch_offset; - } - - entry[i] = & ExtEntryTable[j]; - break; - } - } - } - - if (offset == ~0) { - offset = next_dynamic_offset; - next_dynamic_offset++; - } - - for (i = 0 ; function_names[i] != NULL ; i++) { - if (!is_static[i]) { - if (entry[i] == NULL) { - entry[i] = add_function_name(function_names[i]); - if (entry[i] == NULL) - return -1; - } - - entry[i]->parameter_signature = strdup(real_sig); - entry[i]->dispatch_offset = offset; - } - } - - return offset; -} - -/* - * glXGetProcAddress doesn't exist in the protocol, the drivers never call - * this themselves, and neither does the server. warn if it happens though. - */ -PUBLIC _glapi_proc -_glapi_get_proc_address(const char *funcName) -{ - ErrorF("_glapi_get_proc_address called!\n"); - return NULL; -} - -/** - * Return size of dispatch table struct as number of functions (or - * slots). - */ -PUBLIC GLuint -_glapi_get_dispatch_table_size(void) -{ - return DISPATCH_TABLE_SIZE; -} - -#if defined(PTHREADS) || defined(GLX_USE_TLS) -/** - * Perform platform-specific GL API entry-point fixups. - */ -static void -init_glapi_relocs( void ) -{ -#if defined(USE_X86_ASM) && defined(GLX_USE_TLS) && !defined(GLX_X86_READONLY_TEXT) - extern unsigned long _x86_get_dispatch(void); - char run_time_patch[] = { - 0x65, 0xa1, 0, 0, 0, 0 /* movl %gs:0,%eax */ - }; - GLuint *offset = (GLuint *) &run_time_patch[2]; /* 32-bits for x86/32 */ - const GLubyte * const get_disp = (const GLubyte *) run_time_patch; - GLubyte * curr_func = (GLubyte *) gl_dispatch_functions_start; - - *offset = _x86_get_dispatch(); - while ( curr_func != (GLubyte *) gl_dispatch_functions_end ) { - (void) memcpy( curr_func, get_disp, sizeof(run_time_patch)); - curr_func += DISPATCH_FUNCTION_SIZE; - } -#endif -} -#endif /* defined(PTHREADS) || defined(GLX_USE_TLS) */ |