/* * 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 #include #ifdef _MSC_VER #define PUBLIC _declspec(dllexport) #else #define PUBLIC _X_EXPORT #endif #else #include "glheader.h" #endif #include #include #ifdef DEBUG #include #endif #include #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) static GLboolean ThreadSafe = GL_FALSE; /**< In thread-safe mode? */ _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 /** * We should call this periodically from a function such as glXMakeCurrent * in order to test if multiple threads are being used. */ PUBLIC void _glapi_check_multithread(void) { static unsigned long knownID; static GLboolean firstCall = GL_TRUE; if (ThreadSafe) return; CHECK_MULTITHREAD_LOCK(); if (firstCall) { _glapi_init_multithread(); knownID = _glthread_GetID(); firstCall = GL_FALSE; } else if (knownID != _glthread_GetID()) { ThreadSafe = GL_TRUE; _glapi_set_dispatch(NULL); _glapi_set_context(NULL); } CHECK_MULTITHREAD_UNLOCK(); } #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 = (ThreadSafe) ? NULL : 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; #elif defined(THREADS) return (ThreadSafe) ? _glthread_GetTSD(&ContextTSD) : _glapi_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; } #ifdef DEBUG else { _glapi_check_table_not_null(dispatch); _glapi_check_table(dispatch); } #endif #if defined(GLX_USE_TLS) _glapi_tls_Dispatch = dispatch; #elif defined(THREADS) _glthread_SetTSD(&_gl_DispatchTSD, (void *) dispatch); _glapi_Dispatch = (ThreadSafe) ? NULL : 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; #elif defined(THREADS) return (ThreadSafe) ? (struct _glapi_table *) _glthread_GetTSD(&_gl_DispatchTSD) : _glapi_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; } /** * Make sure there are no NULL pointers in the given dispatch table. * Intended for debugging purposes. */ void _glapi_check_table_not_null(const struct _glapi_table *table) { #ifdef EXTRA_DEBUG /* set to DEBUG for extra DEBUG */ const GLuint entries = _glapi_get_dispatch_table_size(); const void **tab = (const void **) table; GLuint i; for (i = 1; i < entries; i++) { assert(tab[i]); } #else (void) table; #endif } /** * Do some spot checks to be sure that the dispatch table * slots are assigned correctly. For debugging only. */ void _glapi_check_table(const struct _glapi_table *table) { #ifdef EXTRA_DEBUG /* set to DEBUG for extra DEBUG */ { GLuint BeginOffset = _glapi_get_proc_offset("glBegin"); char *BeginFunc = (char*) &table->Begin; GLuint offset = (BeginFunc - (char *) table) / sizeof(void *); assert(BeginOffset == offset); } { GLuint viewportOffset = _glapi_get_proc_offset("glViewport"); char *viewportFunc = (char*) &table->Viewport; GLuint offset = (viewportFunc - (char *) table) / sizeof(void *); assert(viewportOffset == offset); } { GLuint VertexPointerOffset = _glapi_get_proc_offset("glVertexPointer"); char *VertexPointerFunc = (char*) &table->VertexPointer; GLuint offset = (VertexPointerFunc - (char *) table) / sizeof(void *); assert(VertexPointerOffset == offset); } { GLuint ResetMinMaxOffset = _glapi_get_proc_offset("glResetMinmax"); char *ResetMinMaxFunc = (char*) &table->ResetMinmax; GLuint offset = (ResetMinMaxFunc - (char *) table) / sizeof(void *); assert(ResetMinMaxOffset == offset); } { GLuint blendColorOffset = _glapi_get_proc_offset("glBlendColor"); char *blendColorFunc = (char*) &table->BlendColor; GLuint offset = (blendColorFunc - (char *) table) / sizeof(void *); assert(blendColorOffset == offset); } { GLuint secondaryColor3fOffset = _glapi_get_proc_offset("glSecondaryColor3fEXT"); char *secondaryColor3fFunc = (char*) &table->SecondaryColor3fEXT; GLuint offset = (secondaryColor3fFunc - (char *) table) / sizeof(void *); assert(secondaryColor3fOffset == offset); } { GLuint pointParameterivOffset = _glapi_get_proc_offset("glPointParameterivNV"); char *pointParameterivFunc = (char*) &table->PointParameterivNV; GLuint offset = (pointParameterivFunc - (char *) table) / sizeof(void *); assert(pointParameterivOffset == offset); } { GLuint setFenceOffset = _glapi_get_proc_offset("glSetFenceNV"); char *setFenceFunc = (char*) &table->SetFenceNV; GLuint offset = (setFenceFunc - (char *) table) / sizeof(void *); assert(setFenceOffset == offset); } #else (void) table; #endif }