diff options
Diffstat (limited to 'xorg-server/glx/glapi.c')
| -rw-r--r-- | xorg-server/glx/glapi.c | 2186 |
1 files changed, 1093 insertions, 1093 deletions
diff --git a/xorg-server/glx/glapi.c b/xorg-server/glx/glapi.c index 7c75d2d5a..d95374dd1 100644 --- a/xorg-server/glx/glapi.c +++ b/xorg-server/glx/glapi.c @@ -1,1093 +1,1093 @@ -/* - * 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. - */ - - -/* - * This file manages the OpenGL API dispatch layer. - * The dispatch table (struct _glapi_table) is basically just a list - * of function pointers. - * There are functions to set/get the current dispatch table for the - * current thread and to manage registration/dispatch of dynamically - * added extension functions. - * - * It's intended that this file and the other glapi*.[ch] files are - * flexible enough to be reused in several places: XFree86, DRI- - * based libGL.so, and perhaps the SGI SI. - * - * NOTE: There are no dependencies on Mesa in this code. - * - * Versions (API changes): - * 2000/02/23 - original version for Mesa 3.3 and XFree86 4.0 - * 2001/01/16 - added dispatch override feature for Mesa 3.5 - * 2002/06/28 - added _glapi_set_warning_func(), Mesa 4.1. - * 2002/10/01 - _glapi_get_proc_address() will now generate new entrypoints - * itself (using offset ~0). _glapi_add_entrypoint() can be - * called afterward and it'll fill in the correct dispatch - * offset. This allows DRI libGL to avoid probing for DRI - * drivers! No changes to the public glapi interface. - */ - - - -#ifdef HAVE_DIX_CONFIG_H - -#include <dix-config.h> -#include <X11/Xfuncproto.h> -#ifdef _MSC_VER -#define PUBLIC _declspec(dllexport) -#else -#define PUBLIC _X_EXPORT -#endif - -#else - -#include "glheader.h" - -#endif - -#include <stdlib.h> -#include <string.h> -#ifdef DEBUG -#include <assert.h> -#endif -#include <unistd.h> - -#include "glapi.h" -#include "GL/gl.h" -#include "GL/glext.h" -#include "glapitable.h" - -#define FIRST_DYNAMIC_OFFSET (sizeof(struct _glapi_table) / sizeof(void *)) - -/***** BEGIN NO-OP DISPATCH *****/ - -static GLboolean WarnFlag = GL_FALSE; -static _glapi_proc warning_func; - -#if defined(PTHREADS) || defined(GLX_USE_TLS) -static void init_glapi_relocs(void); -#endif - -static _glapi_proc generate_entrypoint(GLuint functionOffset); -static void fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset); -static void init_glapi_relocs_once( void ); - -void _GLAPI_EXPORT -_glapi_noop_enable_warnings(unsigned char enable) -{ -} - -void _GLAPI_EXPORT -_glapi_set_warning_func(_glapi_proc func) -{ -} - -#ifdef DEBUG - -/** - * Called by each of the no-op GL entrypoints. - */ -static int -Warn(const char *func) -{ -#if !defined(_WIN32_WCE) - if (getenv("MESA_DEBUG") || getenv("LIBGL_DEBUG")) { - fprintf(stderr, "GL User Error: gl%s called without a rendering context\n", - func); - } -#endif - return 0; -} - - -/** - * This is called if the user somehow calls an unassigned GL dispatch function. - */ -static GLint -NoOpUnused(void) -{ - return Warn(" function"); -} - -/* - * Defines for the glapitemp.h functions. - */ -#define KEYWORD1 static -#define KEYWORD1_ALT static -#define KEYWORD2 GLAPIENTRY -#define NAME(func) NoOp##func -#define DISPATCH(func, args, msg) Warn(#func); -#define RETURN_DISPATCH(func, args, msg) Warn(#func); return 0 - - -/* - * Defines for the table of no-op entry points. - */ -#define TABLE_ENTRY(name) (_glapi_proc) NoOp##name - -#else - -static int -NoOpGeneric(void) -{ -#if !defined(_WIN32_WCE) - if (getenv("MESA_DEBUG") || getenv("LIBGL_DEBUG")) { - fprintf(stderr, "GL User Error: calling GL function without a rendering context\n"); - } -#endif - return 0; -} - -#define TABLE_ENTRY(name) (_glapi_proc) NoOpGeneric - -#endif - -#define DISPATCH_TABLE_NAME __glapi_noop_table -#define UNUSED_TABLE_NAME __unused_noop_functions - -#include "glapitemp.h" - -/***** END NO-OP DISPATCH *****/ - - - -/** - * \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. - * - * There is a race condition in setting \c _glapi_Dispatch to \c NULL. It is - * possible for the original thread to be setting it at the same instant a new - * thread, perhaps running on a different processor, is clearing it. Because - * of that, \c ThreadSafe, which can only ever be changed to \c GL_TRUE, is - * used to determine whether or not the application is multithreaded. - * - * 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 __thread struct _glapi_table * _glapi_tls_Dispatch - __attribute__((tls_model("initial-exec"))) - = (struct _glapi_table *) __glapi_noop_table; - -PUBLIC __thread void * _glapi_tls_Context - __attribute__((tls_model("initial-exec"))); - -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 */ - -#endif /* defined(THREADS) */ - -PUBLIC struct _glapi_table *_glapi_Dispatch = (struct _glapi_table *) __glapi_noop_table; - -PUBLIC void *_glapi_Context = NULL; - -#endif /* defined(GLX_USE_TLS) */ -/*@}*/ - - - -#if defined(THREADS) && !defined(GLX_USE_TLS) - -void -_glapi_init_multithread(void) -{ - _glthread_InitTSD(&_gl_DispatchTSD); - _glthread_InitTSD(&ContextTSD); -} - -void -_glapi_destroy_multithread(void) -{ -#ifdef WIN32_THREADS - _glthread_DestroyTSD(&_gl_DispatchTSD); - _glthread_DestroyTSD(&ContextTSD); -#endif -} - -/** - * Mutex for multithread check. - */ -#ifdef WIN32_THREADS -/* _glthread_DECLARE_STATIC_MUTEX is broken on windows. There will be race! */ -#define CHECK_MULTITHREAD_LOCK() -#define CHECK_MULTITHREAD_UNLOCK() -#else -_glthread_DECLARE_STATIC_MUTEX(ThreadCheckMutex); -#define CHECK_MULTITHREAD_LOCK() _glthread_LOCK_MUTEX(ThreadCheckMutex) -#define CHECK_MULTITHREAD_UNLOCK() _glthread_UNLOCK_MUTEX(ThreadCheckMutex) -#endif -/** - * xserver's gl is not multithreaded, we promise. - */ -PUBLIC void -_glapi_check_multithread(void) -{ -} -#else - -void -_glapi_init_multithread(void) { } - -void -_glapi_destroy_multithread(void) { } - -PUBLIC void -_glapi_check_multithread(void) { } - -#endif - - - -/** - * 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. - */ -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. - */ -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. - * If the dispatch parameter is NULL we'll plug in the no-op dispatch - * table (__glapi_noop_table). - */ -void -_glapi_set_dispatch(struct _glapi_table *dispatch) -{ - init_glapi_relocs_once(); - - if (dispatch == NULL) { - /* use the no-op functions */ - dispatch = (struct _glapi_table *) __glapi_noop_table; - } - -#if defined(GLX_USE_TLS) - _glapi_tls_Dispatch = dispatch; -#else - _glapi_Dispatch = dispatch; -#endif -} - - - -/** - * Return pointer to current dispatch table for calling thread. - */ -struct _glapi_table * -_glapi_get_dispatch(void) -{ -#if defined(GLX_USE_TLS) - return _glapi_tls_Dispatch; -#else - return _glapi_Dispatch; -#endif -} - - - -/*** - *** The rest of this file is pretty much concerned with GetProcAddress - *** functionality. - ***/ - -#if defined(USE_X86_ASM) -# if defined(GLX_USE_TLS) -# define DISPATCH_FUNCTION_SIZE 16 -# elif defined(THREADS) -# define DISPATCH_FUNCTION_SIZE 32 -# else -# define DISPATCH_FUNCTION_SIZE 16 -# endif -#endif - -#if defined(USE_X64_64_ASM) -# if defined(GLX_USE_TLS) -# define DISPATCH_FUNCTION_SIZE 16 -# endif -#endif - -#if !defined(DISPATCH_FUNCTION_SIZE) && !defined(XFree86Server) && !defined(XGLServer) -# define NEED_FUNCTION_POINTER -#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 * -get_static_proc( 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; -#ifdef MANGLE - /* skip the prefix on the name */ - if (strcmp(testName, n + 1) == 0) -#else - if (strcmp(testName, n) == 0) -#endif - { - 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 = get_static_proc( funcName ); - if (f == NULL) { - return -1; - } - - return f->Offset; -} - - -/********************************************************************** - * Extension function management. - */ - -/** - * Number of extension functions which we can dynamically add at runtime. - * - * Number of extension functions is also subject to the size of backing exec - * mem we allocate. For the common case of dispatch stubs with size 16 bytes, - * the two limits will be hit simultaneously. For larger dispatch function - * sizes, MAX_EXTENSION_FUNCS is effectively reduced. - */ -#define MAX_EXTENSION_FUNCS 256 - - -/** - * 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; - - - /** - * Pointer to the dispatch stub for the named function. - * - * \todo - * The semantic of this field should be changed slightly. Currently, it - * is always expected to be non-\c NULL. However, it would be better to - * only allocate the entry-point stub when the application requests the - * function via \c glXGetProcAddress. This would save memory for all the - * functions that the driver exports but that the application never wants - * to call. - */ - _glapi_proc dispatch_stub; -}; - - -static struct _glapi_function ExtEntryTable[MAX_EXTENSION_FUNCS]; -static GLuint NumExtEntryPoints = 0; - - -static struct _glapi_function * -get_extension_proc(const char *funcName) -{ - GLuint i; - for (i = 0; i < NumExtEntryPoints; i++) { - if (strcmp(ExtEntryTable[i].name, funcName) == 0) { - return & ExtEntryTable[i]; - } - } - return NULL; -} - - -static GLint -get_extension_proc_offset(const char *funcName) -{ - const struct _glapi_function * const f = get_extension_proc( funcName ); - if (f == NULL) { - return -1; - } - - return f->dispatch_offset; -} - - -static _glapi_proc -get_extension_proc_address(const char *funcName) -{ - const struct _glapi_function * const f = get_extension_proc( funcName ); - if (f == NULL) { - return NULL; - } - - return f->dispatch_stub; -} - - -static const char * -get_extension_proc_name(GLuint offset) -{ - GLuint i; - for (i = 0; i < NumExtEntryPoints; i++) { - if (ExtEntryTable[i].dispatch_offset == offset) { - return ExtEntryTable[i].name; - } - } - return NULL; -} - - -/** - * strdup() is actually not a standard ANSI C or POSIX routine. - * Irix will not define it if ANSI mode is in effect. - */ -static char * -str_dup(const char *str) -{ - char *copy; - copy = (char*) malloc(strlen(str) + 1); - if (!copy) - return NULL; - strcpy(copy, str); - return copy; -} - - -/** - * 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; - _glapi_proc entrypoint = NULL; - char * name_dup = NULL; - - if (NumExtEntryPoints >= MAX_EXTENSION_FUNCS) - return NULL; - - if (funcName == NULL) - return NULL; - - name_dup = str_dup(funcName); - if (name_dup == NULL) - return NULL; - - entrypoint = generate_entrypoint(~0); - - if (entrypoint == NULL) { - free(name_dup); - return NULL; - } - - entry = & ExtEntryTable[NumExtEntryPoints]; - NumExtEntryPoints++; - - entry->name = name_dup; - entry->parameter_signature = NULL; - entry->dispatch_offset = ~0; - entry->dispatch_stub = entrypoint; - - return entry; -} - - -static struct _glapi_function * -set_entry_info( struct _glapi_function * entry, const char * signature, unsigned offset ) -{ - char * sig_dup = NULL; - - if (signature == NULL) - return NULL; - - sig_dup = str_dup(signature); - if (sig_dup == NULL) - return NULL; - - fill_in_entrypoint_offset(entry->dispatch_stub, offset); - - entry->parameter_signature = sig_dup; - entry->dispatch_offset = offset; - - return entry; -} - -#if defined(USE_X86_ASM) - -/** - * Perform platform-specific GL API entry-point fixups. - */ -static void -init_glapi_relocs( void ) -{ -#if 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 -} - - -/** - * Generate a dispatch function (entrypoint) which jumps through - * the given slot number (offset) in the current dispatch table. - * We need assembly language in order to accomplish this. - */ -_glapi_proc -generate_entrypoint(unsigned int functionOffset) -{ - /* 32 is chosen as something of a magic offset. For x86, the dispatch - * at offset 32 is the first one where the offset in the - * "jmp OFFSET*4(%eax)" can't be encoded in a single byte. - */ - const GLubyte * const template_func = gl_dispatch_functions_start - + (DISPATCH_FUNCTION_SIZE * 32); - GLubyte * const code = (GLubyte *) u_execmem_alloc(DISPATCH_FUNCTION_SIZE); - - - if ( code != NULL ) { - (void) memcpy(code, template_func, DISPATCH_FUNCTION_SIZE); - fill_in_entrypoint_offset( (_glapi_proc) code, functionOffset ); - } - - return (_glapi_proc) code; -} - - -/** - * This function inserts a new dispatch offset into the assembly language - * stub that was generated with the preceeding function. - */ -void -fill_in_entrypoint_offset(_glapi_proc entrypoint, unsigned int offset) -{ - GLubyte * const code = (GLubyte *) entrypoint; - -#if defined(GLX_USE_TLS) - *((unsigned int *)(code + 8)) = 4 * offset; -#elif defined(THREADS) - *((unsigned int *)(code + 11)) = 4 * offset; - *((unsigned int *)(code + 22)) = 4 * offset; -#else - *((unsigned int *)(code + 7)) = 4 * offset; -#endif -} - - -#elif defined(USE_SPARC_ASM) - -extern void __glapi_sparc_icache_flush(unsigned int *); - -static void -init_glapi_relocs( void ) -{ -#if defined(PTHREADS) || defined(GLX_USE_TLS) - static const unsigned int template[] = { -#ifdef GLX_USE_TLS - 0x05000000, /* sethi %hi(_glapi_tls_Dispatch), %g2 */ - 0x8730e00a, /* srl %g3, 10, %g3 */ - 0x8410a000, /* or %g2, %lo(_glapi_tls_Dispatch), %g2 */ -#ifdef __arch64__ - 0xc259c002, /* ldx [%g7 + %g2], %g1 */ - 0xc2584003, /* ldx [%g1 + %g3], %g1 */ -#else - 0xc201c002, /* ld [%g7 + %g2], %g1 */ - 0xc2004003, /* ld [%g1 + %g3], %g1 */ -#endif - 0x81c04000, /* jmp %g1 */ - 0x01000000, /* nop */ -#else -#ifdef __arch64__ - 0x03000000, /* 64-bit 0x00 --> sethi %hh(_glapi_Dispatch), %g1 */ - 0x05000000, /* 64-bit 0x04 --> sethi %lm(_glapi_Dispatch), %g2 */ - 0x82106000, /* 64-bit 0x08 --> or %g1, %hm(_glapi_Dispatch), %g1 */ - 0x8730e00a, /* 64-bit 0x0c --> srl %g3, 10, %g3 */ - 0x83287020, /* 64-bit 0x10 --> sllx %g1, 32, %g1 */ - 0x82004002, /* 64-bit 0x14 --> add %g1, %g2, %g1 */ - 0xc2586000, /* 64-bit 0x18 --> ldx [%g1 + %lo(_glapi_Dispatch)], %g1 */ -#else - 0x03000000, /* 32-bit 0x00 --> sethi %hi(_glapi_Dispatch), %g1 */ - 0x8730e00a, /* 32-bit 0x04 --> srl %g3, 10, %g3 */ - 0xc2006000, /* 32-bit 0x08 --> ld [%g1 + %lo(_glapi_Dispatch)], %g1 */ -#endif - 0x80a06000, /* --> cmp %g1, 0 */ - 0x02800005, /* --> be +4*5 */ - 0x01000000, /* --> nop */ -#ifdef __arch64__ - 0xc2584003, /* 64-bit --> ldx [%g1 + %g3], %g1 */ -#else - 0xc2004003, /* 32-bit --> ld [%g1 + %g3], %g1 */ -#endif - 0x81c04000, /* --> jmp %g1 */ - 0x01000000, /* --> nop */ -#ifdef __arch64__ - 0x9de3bf80, /* 64-bit --> save %sp, -128, %sp */ -#else - 0x9de3bfc0, /* 32-bit --> save %sp, -64, %sp */ -#endif - 0xa0100003, /* --> mov %g3, %l0 */ - 0x40000000, /* --> call _glapi_get_dispatch */ - 0x01000000, /* --> nop */ - 0x82100008, /* --> mov %o0, %g1 */ - 0x86100010, /* --> mov %l0, %g3 */ - 0x10bffff7, /* --> ba -4*9 */ - 0x81e80000, /* --> restore */ -#endif - }; -#ifdef GLX_USE_TLS - extern unsigned int __glapi_sparc_tls_stub; - extern unsigned long __glapi_sparc_get_dispatch(void); - unsigned int *code = &__glapi_sparc_tls_stub; - unsigned long dispatch = __glapi_sparc_get_dispatch(); -#else - extern unsigned int __glapi_sparc_pthread_stub; - unsigned int *code = &__glapi_sparc_pthread_stub; - unsigned long dispatch = (unsigned long) &_glapi_Dispatch; - unsigned long call_dest = (unsigned long ) &_glapi_get_dispatch; - int idx; -#endif - -#ifdef GLX_USE_TLS - code[0] = template[0] | (dispatch >> 10); - code[1] = template[1]; - __glapi_sparc_icache_flush(&code[0]); - code[2] = template[2] | (dispatch & 0x3ff); - code[3] = template[3]; - __glapi_sparc_icache_flush(&code[2]); - code[4] = template[4]; - code[5] = template[5]; - __glapi_sparc_icache_flush(&code[4]); - code[6] = template[6]; - __glapi_sparc_icache_flush(&code[6]); -#else -#if defined(__arch64__) - code[0] = template[0] | (dispatch >> (32 + 10)); - code[1] = template[1] | ((dispatch & 0xffffffff) >> 10); - __glapi_sparc_icache_flush(&code[0]); - code[2] = template[2] | ((dispatch >> 32) & 0x3ff); - code[3] = template[3]; - __glapi_sparc_icache_flush(&code[2]); - code[4] = template[4]; - code[5] = template[5]; - __glapi_sparc_icache_flush(&code[4]); - code[6] = template[6] | (dispatch & 0x3ff); - idx = 7; -#else - code[0] = template[0] | (dispatch >> 10); - code[1] = template[1]; - __glapi_sparc_icache_flush(&code[0]); - code[2] = template[2] | (dispatch & 0x3ff); - idx = 3; -#endif - code[idx + 0] = template[idx + 0]; - __glapi_sparc_icache_flush(&code[idx - 1]); - code[idx + 1] = template[idx + 1]; - code[idx + 2] = template[idx + 2]; - __glapi_sparc_icache_flush(&code[idx + 1]); - code[idx + 3] = template[idx + 3]; - code[idx + 4] = template[idx + 4]; - __glapi_sparc_icache_flush(&code[idx + 3]); - code[idx + 5] = template[idx + 5]; - code[idx + 6] = template[idx + 6]; - __glapi_sparc_icache_flush(&code[idx + 5]); - code[idx + 7] = template[idx + 7]; - code[idx + 8] = template[idx + 8] | - (((call_dest - ((unsigned long) &code[idx + 8])) - >> 2) & 0x3fffffff); - __glapi_sparc_icache_flush(&code[idx + 7]); - code[idx + 9] = template[idx + 9]; - code[idx + 10] = template[idx + 10]; - __glapi_sparc_icache_flush(&code[idx + 9]); - code[idx + 11] = template[idx + 11]; - code[idx + 12] = template[idx + 12]; - __glapi_sparc_icache_flush(&code[idx + 11]); - code[idx + 13] = template[idx + 13]; - __glapi_sparc_icache_flush(&code[idx + 13]); -#endif -#endif -} - - -_glapi_proc -generate_entrypoint(GLuint functionOffset) -{ -#if defined(PTHREADS) || defined(GLX_USE_TLS) - static const unsigned int template[] = { - 0x07000000, /* sethi %hi(0), %g3 */ - 0x8210000f, /* mov %o7, %g1 */ - 0x40000000, /* call */ - 0x9e100001, /* mov %g1, %o7 */ - }; -#ifdef GLX_USE_TLS - extern unsigned int __glapi_sparc_tls_stub; - unsigned long call_dest = (unsigned long ) &__glapi_sparc_tls_stub; -#else - extern unsigned int __glapi_sparc_pthread_stub; - unsigned long call_dest = (unsigned long ) &__glapi_sparc_pthread_stub; -#endif - unsigned int *code = (unsigned int *) u_execmem_alloc(sizeof(template)); - if (code) { - code[0] = template[0] | (functionOffset & 0x3fffff); - code[1] = template[1]; - __glapi_sparc_icache_flush(&code[0]); - code[2] = template[2] | - (((call_dest - ((unsigned long) &code[2])) - >> 2) & 0x3fffffff); - code[3] = template[3]; - __glapi_sparc_icache_flush(&code[2]); - } - return (_glapi_proc) code; -#endif -} - - -void -fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset) -{ - unsigned int *code = (unsigned int *) entrypoint; - - code[0] &= ~0x3fffff; - code[0] |= (offset * sizeof(void *)) & 0x3fffff; - __glapi_sparc_icache_flush(&code[0]); -} - - -#else /* USE_*_ASM */ - -static void -init_glapi_relocs( void ) -{ -} - - -_glapi_proc -generate_entrypoint(GLuint functionOffset) -{ - (void) functionOffset; - return NULL; -} - - -void -fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset) -{ - /* an unimplemented architecture */ - (void) entrypoint; - (void) offset; -} - -#endif /* USE_*_ASM */ - - -void -init_glapi_relocs_once( void ) -{ -#if defined(PTHREADS) || defined(GLX_USE_TLS) - static pthread_once_t once_control = PTHREAD_ONCE_INIT; - pthread_once( & once_control, init_glapi_relocs ); -#endif -} - -/** - * 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]. Return -1 if error/problem. - * - * \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; - int offset = ~0; - - init_glapi_relocs_once(); - - (void) memset( is_static, 0, sizeof( is_static ) ); - (void) memset( entry, 0, sizeof( entry ) ); - - /* Find the _single_ dispatch offset for all function names that already - * exist (and have a dispatch offset). - */ - - for ( i = 0 ; function_names[i] != NULL ; i++ ) { - const char * funcName = function_names[i]; - int static_offset; - int extension_offset; - - if (funcName[0] != 'g' || funcName[1] != 'l') - return -1; - - /* search built-in functions */ - static_offset = get_static_proc_offset(funcName); - - if (static_offset >= 0) { - - is_static[i] = GL_TRUE; - - /* FIXME: Make sure the parameter signatures match! How do we get - * FIXME: the parameter signature for static functions? - */ - - if ( (offset != ~0) && (static_offset != offset) ) { - return -1; - } - - offset = static_offset; - - continue; - } - - /* search added extension functions */ - entry[i] = get_extension_proc(funcName); - - if (entry[i] != NULL) { - extension_offset = entry[i]->dispatch_offset; - - /* The offset may be ~0 if the function name was added by - * glXGetProcAddress but never filled in by the driver. - */ - - if (extension_offset == ~0) { - continue; - } - - if (strcmp(real_sig, entry[i]->parameter_signature) != 0) { - return -1; - } - - if ( (offset != ~0) && (extension_offset != offset) ) { - return -1; - } - - offset = extension_offset; - } - } - - /* If all function names are either new (or with no dispatch offset), - * allocate a new dispatch offset. - */ - - if (offset == ~0) { - offset = next_dynamic_offset; - next_dynamic_offset++; - } - - /* Fill in the dispatch offset for the new function names (and those with - * no dispatch offset). - */ - - for ( i = 0 ; function_names[i] != NULL ; i++ ) { - if (is_static[i]) { - continue; - } - - /* generate entrypoints for new function names */ - if (entry[i] == NULL) { - entry[i] = add_function_name( function_names[i] ); - if (entry[i] == NULL) { - /* FIXME: Possible memory leak here. */ - return -1; - } - } - - if (entry[i]->dispatch_offset == ~0) { - set_entry_info( entry[i], real_sig, offset ); - } - } - - return offset; -} - -/** - * Return size of dispatch table struct as number of functions (or - * slots). - */ -GLuint -_glapi_get_dispatch_table_size(void) -{ - /* - * 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. - */ - return FIRST_DYNAMIC_OFFSET + MAX_EXTENSION_FUNCS; -} - +/*
+ * 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.
+ */
+
+
+/*
+ * This file manages the OpenGL API dispatch layer.
+ * The dispatch table (struct _glapi_table) is basically just a list
+ * of function pointers.
+ * There are functions to set/get the current dispatch table for the
+ * current thread and to manage registration/dispatch of dynamically
+ * added extension functions.
+ *
+ * It's intended that this file and the other glapi*.[ch] files are
+ * flexible enough to be reused in several places: XFree86, DRI-
+ * based libGL.so, and perhaps the SGI SI.
+ *
+ * NOTE: There are no dependencies on Mesa in this code.
+ *
+ * Versions (API changes):
+ * 2000/02/23 - original version for Mesa 3.3 and XFree86 4.0
+ * 2001/01/16 - added dispatch override feature for Mesa 3.5
+ * 2002/06/28 - added _glapi_set_warning_func(), Mesa 4.1.
+ * 2002/10/01 - _glapi_get_proc_address() will now generate new entrypoints
+ * itself (using offset ~0). _glapi_add_entrypoint() can be
+ * called afterward and it'll fill in the correct dispatch
+ * offset. This allows DRI libGL to avoid probing for DRI
+ * drivers! No changes to the public glapi interface.
+ */
+
+
+
+#ifdef HAVE_DIX_CONFIG_H
+
+#include <dix-config.h>
+#include <X11/Xfuncproto.h>
+#ifdef _MSC_VER
+#define PUBLIC _declspec(dllexport)
+#else
+#define PUBLIC _X_EXPORT
+#endif
+
+#else
+
+#include "glheader.h"
+
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+#ifdef DEBUG
+#include <assert.h>
+#endif
+#include <unistd.h>
+
+#include "glapi.h"
+#include "GL/gl.h"
+#include "GL/glext.h"
+#include "glapitable.h"
+
+#define FIRST_DYNAMIC_OFFSET (sizeof(struct _glapi_table) / sizeof(void *))
+
+/***** BEGIN NO-OP DISPATCH *****/
+
+static GLboolean WarnFlag = GL_FALSE;
+static _glapi_proc warning_func;
+
+#if defined(PTHREADS) || defined(GLX_USE_TLS)
+static void init_glapi_relocs(void);
+#endif
+
+static _glapi_proc generate_entrypoint(GLuint functionOffset);
+static void fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset);
+static void init_glapi_relocs_once( void );
+
+void _GLAPI_EXPORT
+_glapi_noop_enable_warnings(unsigned char enable)
+{
+}
+
+void _GLAPI_EXPORT
+_glapi_set_warning_func(_glapi_proc func)
+{
+}
+
+#ifdef DEBUG
+
+/**
+ * Called by each of the no-op GL entrypoints.
+ */
+static int
+Warn(const char *func)
+{
+#if !defined(_WIN32_WCE)
+ if (getenv("MESA_DEBUG") || getenv("LIBGL_DEBUG")) {
+ fprintf(stderr, "GL User Error: gl%s called without a rendering context\n",
+ func);
+ }
+#endif
+ return 0;
+}
+
+
+/**
+ * This is called if the user somehow calls an unassigned GL dispatch function.
+ */
+static GLint
+NoOpUnused(void)
+{
+ return Warn(" function");
+}
+
+/*
+ * Defines for the glapitemp.h functions.
+ */
+#define KEYWORD1 static
+#define KEYWORD1_ALT static
+#define KEYWORD2 GLAPIENTRY
+#define NAME(func) NoOp##func
+#define DISPATCH(func, args, msg) Warn(#func);
+#define RETURN_DISPATCH(func, args, msg) Warn(#func); return 0
+
+
+/*
+ * Defines for the table of no-op entry points.
+ */
+#define TABLE_ENTRY(name) (_glapi_proc) NoOp##name
+
+#else
+
+static int
+NoOpGeneric(void)
+{
+#if !defined(_WIN32_WCE)
+ if (getenv("MESA_DEBUG") || getenv("LIBGL_DEBUG")) {
+ fprintf(stderr, "GL User Error: calling GL function without a rendering context\n");
+ }
+#endif
+ return 0;
+}
+
+#define TABLE_ENTRY(name) (_glapi_proc) NoOpGeneric
+
+#endif
+
+#define DISPATCH_TABLE_NAME __glapi_noop_table
+#define UNUSED_TABLE_NAME __unused_noop_functions
+
+#include "glapitemp.h"
+
+/***** END NO-OP DISPATCH *****/
+
+
+
+/**
+ * \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.
+ *
+ * There is a race condition in setting \c _glapi_Dispatch to \c NULL. It is
+ * possible for the original thread to be setting it at the same instant a new
+ * thread, perhaps running on a different processor, is clearing it. Because
+ * of that, \c ThreadSafe, which can only ever be changed to \c GL_TRUE, is
+ * used to determine whether or not the application is multithreaded.
+ *
+ * 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
+ __attribute__((tls_model("initial-exec")))
+ = (struct _glapi_table *) __glapi_noop_table;
+
+PUBLIC TLS void * _glapi_tls_Context
+ __attribute__((tls_model("initial-exec")));
+
+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 */
+
+#endif /* defined(THREADS) */
+
+PUBLIC struct _glapi_table *_glapi_Dispatch = (struct _glapi_table *) __glapi_noop_table;
+
+PUBLIC void *_glapi_Context = NULL;
+
+#endif /* defined(GLX_USE_TLS) */
+/*@}*/
+
+
+
+#if defined(THREADS) && !defined(GLX_USE_TLS)
+
+void
+_glapi_init_multithread(void)
+{
+ _glthread_InitTSD(&_gl_DispatchTSD);
+ _glthread_InitTSD(&ContextTSD);
+}
+
+void
+_glapi_destroy_multithread(void)
+{
+#ifdef WIN32_THREADS
+ _glthread_DestroyTSD(&_gl_DispatchTSD);
+ _glthread_DestroyTSD(&ContextTSD);
+#endif
+}
+
+/**
+ * Mutex for multithread check.
+ */
+#ifdef WIN32_THREADS
+/* _glthread_DECLARE_STATIC_MUTEX is broken on windows. There will be race! */
+#define CHECK_MULTITHREAD_LOCK()
+#define CHECK_MULTITHREAD_UNLOCK()
+#else
+_glthread_DECLARE_STATIC_MUTEX(ThreadCheckMutex);
+#define CHECK_MULTITHREAD_LOCK() _glthread_LOCK_MUTEX(ThreadCheckMutex)
+#define CHECK_MULTITHREAD_UNLOCK() _glthread_UNLOCK_MUTEX(ThreadCheckMutex)
+#endif
+/**
+ * xserver's gl is not multithreaded, we promise.
+ */
+PUBLIC void
+_glapi_check_multithread(void)
+{
+}
+#else
+
+void
+_glapi_init_multithread(void) { }
+
+void
+_glapi_destroy_multithread(void) { }
+
+PUBLIC void
+_glapi_check_multithread(void) { }
+
+#endif
+
+
+
+/**
+ * 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.
+ */
+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.
+ */
+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.
+ * If the dispatch parameter is NULL we'll plug in the no-op dispatch
+ * table (__glapi_noop_table).
+ */
+void
+_glapi_set_dispatch(struct _glapi_table *dispatch)
+{
+ init_glapi_relocs_once();
+
+ if (dispatch == NULL) {
+ /* use the no-op functions */
+ dispatch = (struct _glapi_table *) __glapi_noop_table;
+ }
+
+#if defined(GLX_USE_TLS)
+ _glapi_tls_Dispatch = dispatch;
+#else
+ _glapi_Dispatch = dispatch;
+#endif
+}
+
+
+
+/**
+ * Return pointer to current dispatch table for calling thread.
+ */
+struct _glapi_table *
+_glapi_get_dispatch(void)
+{
+#if defined(GLX_USE_TLS)
+ return _glapi_tls_Dispatch;
+#else
+ return _glapi_Dispatch;
+#endif
+}
+
+
+
+/***
+ *** The rest of this file is pretty much concerned with GetProcAddress
+ *** functionality.
+ ***/
+
+#if defined(USE_X86_ASM)
+# if defined(GLX_USE_TLS)
+# define DISPATCH_FUNCTION_SIZE 16
+# elif defined(THREADS)
+# define DISPATCH_FUNCTION_SIZE 32
+# else
+# define DISPATCH_FUNCTION_SIZE 16
+# endif
+#endif
+
+#if defined(USE_X64_64_ASM)
+# if defined(GLX_USE_TLS)
+# define DISPATCH_FUNCTION_SIZE 16
+# endif
+#endif
+
+#if !defined(DISPATCH_FUNCTION_SIZE) && !defined(XFree86Server) && !defined(XGLServer)
+# define NEED_FUNCTION_POINTER
+#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 *
+get_static_proc( 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;
+#ifdef MANGLE
+ /* skip the prefix on the name */
+ if (strcmp(testName, n + 1) == 0)
+#else
+ if (strcmp(testName, n) == 0)
+#endif
+ {
+ 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 = get_static_proc( funcName );
+ if (f == NULL) {
+ return -1;
+ }
+
+ return f->Offset;
+}
+
+
+/**********************************************************************
+ * Extension function management.
+ */
+
+/**
+ * Number of extension functions which we can dynamically add at runtime.
+ *
+ * Number of extension functions is also subject to the size of backing exec
+ * mem we allocate. For the common case of dispatch stubs with size 16 bytes,
+ * the two limits will be hit simultaneously. For larger dispatch function
+ * sizes, MAX_EXTENSION_FUNCS is effectively reduced.
+ */
+#define MAX_EXTENSION_FUNCS 256
+
+
+/**
+ * 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;
+
+
+ /**
+ * Pointer to the dispatch stub for the named function.
+ *
+ * \todo
+ * The semantic of this field should be changed slightly. Currently, it
+ * is always expected to be non-\c NULL. However, it would be better to
+ * only allocate the entry-point stub when the application requests the
+ * function via \c glXGetProcAddress. This would save memory for all the
+ * functions that the driver exports but that the application never wants
+ * to call.
+ */
+ _glapi_proc dispatch_stub;
+};
+
+
+static struct _glapi_function ExtEntryTable[MAX_EXTENSION_FUNCS];
+static GLuint NumExtEntryPoints = 0;
+
+
+static struct _glapi_function *
+get_extension_proc(const char *funcName)
+{
+ GLuint i;
+ for (i = 0; i < NumExtEntryPoints; i++) {
+ if (strcmp(ExtEntryTable[i].name, funcName) == 0) {
+ return & ExtEntryTable[i];
+ }
+ }
+ return NULL;
+}
+
+
+static GLint
+get_extension_proc_offset(const char *funcName)
+{
+ const struct _glapi_function * const f = get_extension_proc( funcName );
+ if (f == NULL) {
+ return -1;
+ }
+
+ return f->dispatch_offset;
+}
+
+
+static _glapi_proc
+get_extension_proc_address(const char *funcName)
+{
+ const struct _glapi_function * const f = get_extension_proc( funcName );
+ if (f == NULL) {
+ return NULL;
+ }
+
+ return f->dispatch_stub;
+}
+
+
+static const char *
+get_extension_proc_name(GLuint offset)
+{
+ GLuint i;
+ for (i = 0; i < NumExtEntryPoints; i++) {
+ if (ExtEntryTable[i].dispatch_offset == offset) {
+ return ExtEntryTable[i].name;
+ }
+ }
+ return NULL;
+}
+
+
+/**
+ * strdup() is actually not a standard ANSI C or POSIX routine.
+ * Irix will not define it if ANSI mode is in effect.
+ */
+static char *
+str_dup(const char *str)
+{
+ char *copy;
+ copy = (char*) malloc(strlen(str) + 1);
+ if (!copy)
+ return NULL;
+ strcpy(copy, str);
+ return copy;
+}
+
+
+/**
+ * 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;
+ _glapi_proc entrypoint = NULL;
+ char * name_dup = NULL;
+
+ if (NumExtEntryPoints >= MAX_EXTENSION_FUNCS)
+ return NULL;
+
+ if (funcName == NULL)
+ return NULL;
+
+ name_dup = str_dup(funcName);
+ if (name_dup == NULL)
+ return NULL;
+
+ entrypoint = generate_entrypoint(~0);
+
+ if (entrypoint == NULL) {
+ free(name_dup);
+ return NULL;
+ }
+
+ entry = & ExtEntryTable[NumExtEntryPoints];
+ NumExtEntryPoints++;
+
+ entry->name = name_dup;
+ entry->parameter_signature = NULL;
+ entry->dispatch_offset = ~0;
+ entry->dispatch_stub = entrypoint;
+
+ return entry;
+}
+
+
+static struct _glapi_function *
+set_entry_info( struct _glapi_function * entry, const char * signature, unsigned offset )
+{
+ char * sig_dup = NULL;
+
+ if (signature == NULL)
+ return NULL;
+
+ sig_dup = str_dup(signature);
+ if (sig_dup == NULL)
+ return NULL;
+
+ fill_in_entrypoint_offset(entry->dispatch_stub, offset);
+
+ entry->parameter_signature = sig_dup;
+ entry->dispatch_offset = offset;
+
+ return entry;
+}
+
+#if defined(USE_X86_ASM)
+
+/**
+ * Perform platform-specific GL API entry-point fixups.
+ */
+static void
+init_glapi_relocs( void )
+{
+#if 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
+}
+
+
+/**
+ * Generate a dispatch function (entrypoint) which jumps through
+ * the given slot number (offset) in the current dispatch table.
+ * We need assembly language in order to accomplish this.
+ */
+_glapi_proc
+generate_entrypoint(unsigned int functionOffset)
+{
+ /* 32 is chosen as something of a magic offset. For x86, the dispatch
+ * at offset 32 is the first one where the offset in the
+ * "jmp OFFSET*4(%eax)" can't be encoded in a single byte.
+ */
+ const GLubyte * const template_func = gl_dispatch_functions_start
+ + (DISPATCH_FUNCTION_SIZE * 32);
+ GLubyte * const code = (GLubyte *) u_execmem_alloc(DISPATCH_FUNCTION_SIZE);
+
+
+ if ( code != NULL ) {
+ (void) memcpy(code, template_func, DISPATCH_FUNCTION_SIZE);
+ fill_in_entrypoint_offset( (_glapi_proc) code, functionOffset );
+ }
+
+ return (_glapi_proc) code;
+}
+
+
+/**
+ * This function inserts a new dispatch offset into the assembly language
+ * stub that was generated with the preceeding function.
+ */
+void
+fill_in_entrypoint_offset(_glapi_proc entrypoint, unsigned int offset)
+{
+ GLubyte * const code = (GLubyte *) entrypoint;
+
+#if defined(GLX_USE_TLS)
+ *((unsigned int *)(code + 8)) = 4 * offset;
+#elif defined(THREADS)
+ *((unsigned int *)(code + 11)) = 4 * offset;
+ *((unsigned int *)(code + 22)) = 4 * offset;
+#else
+ *((unsigned int *)(code + 7)) = 4 * offset;
+#endif
+}
+
+
+#elif defined(USE_SPARC_ASM)
+
+extern void __glapi_sparc_icache_flush(unsigned int *);
+
+static void
+init_glapi_relocs( void )
+{
+#if defined(PTHREADS) || defined(GLX_USE_TLS)
+ static const unsigned int template[] = {
+#ifdef GLX_USE_TLS
+ 0x05000000, /* sethi %hi(_glapi_tls_Dispatch), %g2 */
+ 0x8730e00a, /* srl %g3, 10, %g3 */
+ 0x8410a000, /* or %g2, %lo(_glapi_tls_Dispatch), %g2 */
+#ifdef __arch64__
+ 0xc259c002, /* ldx [%g7 + %g2], %g1 */
+ 0xc2584003, /* ldx [%g1 + %g3], %g1 */
+#else
+ 0xc201c002, /* ld [%g7 + %g2], %g1 */
+ 0xc2004003, /* ld [%g1 + %g3], %g1 */
+#endif
+ 0x81c04000, /* jmp %g1 */
+ 0x01000000, /* nop */
+#else
+#ifdef __arch64__
+ 0x03000000, /* 64-bit 0x00 --> sethi %hh(_glapi_Dispatch), %g1 */
+ 0x05000000, /* 64-bit 0x04 --> sethi %lm(_glapi_Dispatch), %g2 */
+ 0x82106000, /* 64-bit 0x08 --> or %g1, %hm(_glapi_Dispatch), %g1 */
+ 0x8730e00a, /* 64-bit 0x0c --> srl %g3, 10, %g3 */
+ 0x83287020, /* 64-bit 0x10 --> sllx %g1, 32, %g1 */
+ 0x82004002, /* 64-bit 0x14 --> add %g1, %g2, %g1 */
+ 0xc2586000, /* 64-bit 0x18 --> ldx [%g1 + %lo(_glapi_Dispatch)], %g1 */
+#else
+ 0x03000000, /* 32-bit 0x00 --> sethi %hi(_glapi_Dispatch), %g1 */
+ 0x8730e00a, /* 32-bit 0x04 --> srl %g3, 10, %g3 */
+ 0xc2006000, /* 32-bit 0x08 --> ld [%g1 + %lo(_glapi_Dispatch)], %g1 */
+#endif
+ 0x80a06000, /* --> cmp %g1, 0 */
+ 0x02800005, /* --> be +4*5 */
+ 0x01000000, /* --> nop */
+#ifdef __arch64__
+ 0xc2584003, /* 64-bit --> ldx [%g1 + %g3], %g1 */
+#else
+ 0xc2004003, /* 32-bit --> ld [%g1 + %g3], %g1 */
+#endif
+ 0x81c04000, /* --> jmp %g1 */
+ 0x01000000, /* --> nop */
+#ifdef __arch64__
+ 0x9de3bf80, /* 64-bit --> save %sp, -128, %sp */
+#else
+ 0x9de3bfc0, /* 32-bit --> save %sp, -64, %sp */
+#endif
+ 0xa0100003, /* --> mov %g3, %l0 */
+ 0x40000000, /* --> call _glapi_get_dispatch */
+ 0x01000000, /* --> nop */
+ 0x82100008, /* --> mov %o0, %g1 */
+ 0x86100010, /* --> mov %l0, %g3 */
+ 0x10bffff7, /* --> ba -4*9 */
+ 0x81e80000, /* --> restore */
+#endif
+ };
+#ifdef GLX_USE_TLS
+ extern unsigned int __glapi_sparc_tls_stub;
+ extern unsigned long __glapi_sparc_get_dispatch(void);
+ unsigned int *code = &__glapi_sparc_tls_stub;
+ unsigned long dispatch = __glapi_sparc_get_dispatch();
+#else
+ extern unsigned int __glapi_sparc_pthread_stub;
+ unsigned int *code = &__glapi_sparc_pthread_stub;
+ unsigned long dispatch = (unsigned long) &_glapi_Dispatch;
+ unsigned long call_dest = (unsigned long ) &_glapi_get_dispatch;
+ int idx;
+#endif
+
+#ifdef GLX_USE_TLS
+ code[0] = template[0] | (dispatch >> 10);
+ code[1] = template[1];
+ __glapi_sparc_icache_flush(&code[0]);
+ code[2] = template[2] | (dispatch & 0x3ff);
+ code[3] = template[3];
+ __glapi_sparc_icache_flush(&code[2]);
+ code[4] = template[4];
+ code[5] = template[5];
+ __glapi_sparc_icache_flush(&code[4]);
+ code[6] = template[6];
+ __glapi_sparc_icache_flush(&code[6]);
+#else
+#if defined(__arch64__)
+ code[0] = template[0] | (dispatch >> (32 + 10));
+ code[1] = template[1] | ((dispatch & 0xffffffff) >> 10);
+ __glapi_sparc_icache_flush(&code[0]);
+ code[2] = template[2] | ((dispatch >> 32) & 0x3ff);
+ code[3] = template[3];
+ __glapi_sparc_icache_flush(&code[2]);
+ code[4] = template[4];
+ code[5] = template[5];
+ __glapi_sparc_icache_flush(&code[4]);
+ code[6] = template[6] | (dispatch & 0x3ff);
+ idx = 7;
+#else
+ code[0] = template[0] | (dispatch >> 10);
+ code[1] = template[1];
+ __glapi_sparc_icache_flush(&code[0]);
+ code[2] = template[2] | (dispatch & 0x3ff);
+ idx = 3;
+#endif
+ code[idx + 0] = template[idx + 0];
+ __glapi_sparc_icache_flush(&code[idx - 1]);
+ code[idx + 1] = template[idx + 1];
+ code[idx + 2] = template[idx + 2];
+ __glapi_sparc_icache_flush(&code[idx + 1]);
+ code[idx + 3] = template[idx + 3];
+ code[idx + 4] = template[idx + 4];
+ __glapi_sparc_icache_flush(&code[idx + 3]);
+ code[idx + 5] = template[idx + 5];
+ code[idx + 6] = template[idx + 6];
+ __glapi_sparc_icache_flush(&code[idx + 5]);
+ code[idx + 7] = template[idx + 7];
+ code[idx + 8] = template[idx + 8] |
+ (((call_dest - ((unsigned long) &code[idx + 8]))
+ >> 2) & 0x3fffffff);
+ __glapi_sparc_icache_flush(&code[idx + 7]);
+ code[idx + 9] = template[idx + 9];
+ code[idx + 10] = template[idx + 10];
+ __glapi_sparc_icache_flush(&code[idx + 9]);
+ code[idx + 11] = template[idx + 11];
+ code[idx + 12] = template[idx + 12];
+ __glapi_sparc_icache_flush(&code[idx + 11]);
+ code[idx + 13] = template[idx + 13];
+ __glapi_sparc_icache_flush(&code[idx + 13]);
+#endif
+#endif
+}
+
+
+_glapi_proc
+generate_entrypoint(GLuint functionOffset)
+{
+#if defined(PTHREADS) || defined(GLX_USE_TLS)
+ static const unsigned int template[] = {
+ 0x07000000, /* sethi %hi(0), %g3 */
+ 0x8210000f, /* mov %o7, %g1 */
+ 0x40000000, /* call */
+ 0x9e100001, /* mov %g1, %o7 */
+ };
+#ifdef GLX_USE_TLS
+ extern unsigned int __glapi_sparc_tls_stub;
+ unsigned long call_dest = (unsigned long ) &__glapi_sparc_tls_stub;
+#else
+ extern unsigned int __glapi_sparc_pthread_stub;
+ unsigned long call_dest = (unsigned long ) &__glapi_sparc_pthread_stub;
+#endif
+ unsigned int *code = (unsigned int *) u_execmem_alloc(sizeof(template));
+ if (code) {
+ code[0] = template[0] | (functionOffset & 0x3fffff);
+ code[1] = template[1];
+ __glapi_sparc_icache_flush(&code[0]);
+ code[2] = template[2] |
+ (((call_dest - ((unsigned long) &code[2]))
+ >> 2) & 0x3fffffff);
+ code[3] = template[3];
+ __glapi_sparc_icache_flush(&code[2]);
+ }
+ return (_glapi_proc) code;
+#endif
+}
+
+
+void
+fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset)
+{
+ unsigned int *code = (unsigned int *) entrypoint;
+
+ code[0] &= ~0x3fffff;
+ code[0] |= (offset * sizeof(void *)) & 0x3fffff;
+ __glapi_sparc_icache_flush(&code[0]);
+}
+
+
+#else /* USE_*_ASM */
+
+static void
+init_glapi_relocs( void )
+{
+}
+
+
+_glapi_proc
+generate_entrypoint(GLuint functionOffset)
+{
+ (void) functionOffset;
+ return NULL;
+}
+
+
+void
+fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset)
+{
+ /* an unimplemented architecture */
+ (void) entrypoint;
+ (void) offset;
+}
+
+#endif /* USE_*_ASM */
+
+
+void
+init_glapi_relocs_once( void )
+{
+#if defined(PTHREADS) || defined(GLX_USE_TLS)
+ static pthread_once_t once_control = PTHREAD_ONCE_INIT;
+ pthread_once( & once_control, init_glapi_relocs );
+#endif
+}
+
+/**
+ * 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]. Return -1 if error/problem.
+ *
+ * \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;
+ int offset = ~0;
+
+ init_glapi_relocs_once();
+
+ (void) memset( is_static, 0, sizeof( is_static ) );
+ (void) memset( entry, 0, sizeof( entry ) );
+
+ /* Find the _single_ dispatch offset for all function names that already
+ * exist (and have a dispatch offset).
+ */
+
+ for ( i = 0 ; function_names[i] != NULL ; i++ ) {
+ const char * funcName = function_names[i];
+ int static_offset;
+ int extension_offset;
+
+ if (funcName[0] != 'g' || funcName[1] != 'l')
+ return -1;
+
+ /* search built-in functions */
+ static_offset = get_static_proc_offset(funcName);
+
+ if (static_offset >= 0) {
+
+ is_static[i] = GL_TRUE;
+
+ /* FIXME: Make sure the parameter signatures match! How do we get
+ * FIXME: the parameter signature for static functions?
+ */
+
+ if ( (offset != ~0) && (static_offset != offset) ) {
+ return -1;
+ }
+
+ offset = static_offset;
+
+ continue;
+ }
+
+ /* search added extension functions */
+ entry[i] = get_extension_proc(funcName);
+
+ if (entry[i] != NULL) {
+ extension_offset = entry[i]->dispatch_offset;
+
+ /* The offset may be ~0 if the function name was added by
+ * glXGetProcAddress but never filled in by the driver.
+ */
+
+ if (extension_offset == ~0) {
+ continue;
+ }
+
+ if (strcmp(real_sig, entry[i]->parameter_signature) != 0) {
+ return -1;
+ }
+
+ if ( (offset != ~0) && (extension_offset != offset) ) {
+ return -1;
+ }
+
+ offset = extension_offset;
+ }
+ }
+
+ /* If all function names are either new (or with no dispatch offset),
+ * allocate a new dispatch offset.
+ */
+
+ if (offset == ~0) {
+ offset = next_dynamic_offset;
+ next_dynamic_offset++;
+ }
+
+ /* Fill in the dispatch offset for the new function names (and those with
+ * no dispatch offset).
+ */
+
+ for ( i = 0 ; function_names[i] != NULL ; i++ ) {
+ if (is_static[i]) {
+ continue;
+ }
+
+ /* generate entrypoints for new function names */
+ if (entry[i] == NULL) {
+ entry[i] = add_function_name( function_names[i] );
+ if (entry[i] == NULL) {
+ /* FIXME: Possible memory leak here. */
+ return -1;
+ }
+ }
+
+ if (entry[i]->dispatch_offset == ~0) {
+ set_entry_info( entry[i], real_sig, offset );
+ }
+ }
+
+ return offset;
+}
+
+/**
+ * Return size of dispatch table struct as number of functions (or
+ * slots).
+ */
+GLuint
+_glapi_get_dispatch_table_size(void)
+{
+ /*
+ * 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.
+ */
+ return FIRST_DYNAMIC_OFFSET + MAX_EXTENSION_FUNCS;
+}
+
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