| /* |
| * 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. |
| * 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> |
| #define PUBLIC |
| |
| #else |
| |
| #include "glheader.h" |
| |
| #endif |
| |
| #include <stdlib.h> |
| #include <string.h> |
| #ifdef DEBUG |
| #include <assert.h> |
| #endif |
| |
| #include "glapi.h" |
| #include "glapioffsets.h" |
| #include "glapitable.h" |
| |
| /***** BEGIN NO-OP DISPATCH *****/ |
| |
| static GLboolean WarnFlag = GL_FALSE; |
| static _glapi_warning_func 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); |
| |
| /* |
| * Enable/disable printing of warning messages. |
| */ |
| PUBLIC void |
| _glapi_noop_enable_warnings(GLboolean enable) |
| { |
| WarnFlag = enable; |
| } |
| |
| /* |
| * Register a callback function for reporting errors. |
| */ |
| PUBLIC void |
| _glapi_set_warning_func( _glapi_warning_func func ) |
| { |
| warning_func = func; |
| } |
| |
| static GLboolean |
| warn(void) |
| { |
| if ((WarnFlag || getenv("MESA_DEBUG") || getenv("LIBGL_DEBUG")) |
| && warning_func) { |
| return GL_TRUE; |
| } |
| else { |
| return GL_FALSE; |
| } |
| } |
| |
| |
| #define KEYWORD1 static |
| #define KEYWORD1_ALT static |
| #define KEYWORD2 GLAPIENTRY |
| #define NAME(func) NoOp##func |
| |
| #define F NULL |
| |
| #define DISPATCH(func, args, msg) \ |
| if (warn()) { \ |
| warning_func(NULL, "GL User Error: called without context: %s", #func); \ |
| } |
| |
| #define RETURN_DISPATCH(func, args, msg) \ |
| if (warn()) { \ |
| warning_func(NULL, "GL User Error: called without context: %s", #func); \ |
| } \ |
| return 0 |
| |
| #define DISPATCH_TABLE_NAME __glapi_noop_table |
| #define UNUSED_TABLE_NAME __unused_noop_functions |
| |
| #define TABLE_ENTRY(name) (_glapi_proc) NoOp##name |
| |
| static GLint NoOpUnused(void) |
| { |
| if (warn()) { |
| warning_func(NULL, "GL User Error: calling extension function without a current context\n"); |
| } |
| return 0; |
| } |
| |
| #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 */ |
| |
| #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 = |
| (struct _glapi_table *) __glapi_noop_table; |
| PUBLIC void *_glapi_Context = NULL; |
| |
| #endif /* defined(GLX_USE_TLS) */ |
| /*@}*/ |
| |
| |
| /** |
| * 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; |
| } |
| |
| |
| |
| /** |
| * We should call this periodically from a function such as glXMakeCurrent |
| * in order to test if multiple threads are being used. |
| */ |
| void |
| _glapi_check_multithread(void) |
| { |
| #if defined(THREADS) && !defined(GLX_USE_TLS) |
| if (!ThreadSafe) { |
| static unsigned long knownID; |
| static GLboolean firstCall = GL_TRUE; |
| if (firstCall) { |
| knownID = _glthread_GetID(); |
| firstCall = GL_FALSE; |
| } |
| else if (knownID != _glthread_GetID()) { |
| ThreadSafe = GL_TRUE; |
| _glapi_set_dispatch(NULL); |
| _glapi_set_context(NULL); |
| } |
| } |
| else if (!_glapi_get_dispatch()) { |
| /* make sure that this thread's dispatch pointer isn't null */ |
| _glapi_set_dispatch(NULL); |
| } |
| #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. |
| */ |
| PUBLIC void |
| _glapi_set_context(void *context) |
| { |
| (void) __unused_noop_functions; /* silence a warning */ |
| #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. |
| */ |
| PUBLIC void * |
| _glapi_get_context(void) |
| { |
| #if defined(GLX_USE_TLS) |
| return _glapi_tls_Context; |
| #elif defined(THREADS) |
| if (ThreadSafe) { |
| return _glthread_GetTSD(&ContextTSD); |
| } |
| else { |
| return _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). |
| */ |
| 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 (!dispatch) { |
| /* use the no-op functions */ |
| dispatch = (struct _glapi_table *) __glapi_noop_table; |
| } |
| #ifdef DEBUG |
| else { |
| _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 /*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; |
| #elif defined(THREADS) |
| api = (ThreadSafe) |
| ? (struct _glapi_table *) _glthread_GetTSD(&_gl_DispatchTSD) |
| : _glapi_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 |
| |
| #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 * |
| 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; |
| } |
| |
| |
| #if !defined(XFree86Server) && !defined(XGLServer) |
| #ifdef USE_X86_ASM |
| |
| #if defined( GLX_USE_TLS ) |
| extern GLubyte gl_dispatch_functions_start[]; |
| extern GLubyte gl_dispatch_functions_end[]; |
| #else |
| extern const GLubyte gl_dispatch_functions_start[]; |
| #endif |
| |
| #endif /* USE_X86_ASM */ |
| |
| |
| /** |
| * Return dispatch function address for the named static (built-in) function. |
| * Return NULL if function not found. |
| */ |
| static _glapi_proc |
| get_static_proc_address(const char *funcName) |
| { |
| const glprocs_table_t * const f = find_entry( funcName ); |
| if (f) { |
| #if defined(DISPATCH_FUNCTION_SIZE) && defined(GLX_INDIRECT_RENDERING) |
| return (f->Address == NULL) |
| ? (_glapi_proc) (gl_dispatch_functions_start |
| + (DISPATCH_FUNCTION_SIZE * f->Offset)) |
| : f->Address; |
| #elif defined(DISPATCH_FUNCTION_SIZE) |
| return (_glapi_proc) (gl_dispatch_functions_start |
| + (DISPATCH_FUNCTION_SIZE * f->Offset)); |
| #else |
| return f->Address; |
| #endif |
| } |
| else { |
| return NULL; |
| } |
| } |
| |
| #endif /* !defined(XFree86Server) && !defined(XGLServer) */ |
| |
| |
| |
| /** |
| * Return the name of the function at the given offset in the dispatch |
| * table. For debugging only. |
| */ |
| static const char * |
| get_static_proc_name( GLuint offset ) |
| { |
| GLuint i; |
| for (i = 0; static_functions[i].Name_offset >= 0; i++) { |
| if (static_functions[i].Offset == offset) { |
| return gl_string_table + static_functions[i].Name_offset; |
| } |
| } |
| return NULL; |
| } |
| |
| |
| |
| /********************************************************************** |
| * 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; |
| |
| |
| /** |
| * 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; |
| |
| #ifdef USE_SPARC_ASM |
| extern void __glapi_sparc_icache_flush(unsigned int *); |
| #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. |
| */ |
| static _glapi_proc |
| generate_entrypoint(GLuint functionOffset) |
| { |
| #if defined(USE_X86_ASM) |
| /* 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 *) malloc(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; |
| #elif defined(USE_SPARC_ASM) |
| |
| #ifdef __arch64__ |
| static const unsigned int insn_template[] = { |
| 0x05000000, /* sethi %uhi(_glapi_Dispatch), %g2 */ |
| 0x03000000, /* sethi %hi(_glapi_Dispatch), %g1 */ |
| 0x8410a000, /* or %g2, %ulo(_glapi_Dispatch), %g2 */ |
| 0x82106000, /* or %g1, %lo(_glapi_Dispatch), %g1 */ |
| 0x8528b020, /* sllx %g2, 32, %g2 */ |
| 0xc2584002, /* ldx [%g1 + %g2], %g1 */ |
| 0x05000000, /* sethi %hi(8 * glapioffset), %g2 */ |
| 0x8410a000, /* or %g2, %lo(8 * glapioffset), %g2 */ |
| 0xc6584002, /* ldx [%g1 + %g2], %g3 */ |
| 0x81c0c000, /* jmpl %g3, %g0 */ |
| 0x01000000 /* nop */ |
| }; |
| #else |
| static const unsigned int insn_template[] = { |
| 0x03000000, /* sethi %hi(_glapi_Dispatch), %g1 */ |
| 0xc2006000, /* ld [%g1 + %lo(_glapi_Dispatch)], %g1 */ |
| 0xc6006000, /* ld [%g1 + %lo(4*glapioffset)], %g3 */ |
| 0x81c0c000, /* jmpl %g3, %g0 */ |
| 0x01000000 /* nop */ |
| }; |
| #endif /* __arch64__ */ |
| unsigned int *code = (unsigned int *) malloc(sizeof(insn_template)); |
| unsigned long glapi_addr = (unsigned long) &_glapi_Dispatch; |
| if (code) { |
| memcpy(code, insn_template, sizeof(insn_template)); |
| |
| #ifdef __arch64__ |
| code[0] |= (glapi_addr >> (32 + 10)); |
| code[1] |= ((glapi_addr & 0xffffffff) >> 10); |
| __glapi_sparc_icache_flush(&code[0]); |
| code[2] |= ((glapi_addr >> 32) & ((1 << 10) - 1)); |
| code[3] |= (glapi_addr & ((1 << 10) - 1)); |
| __glapi_sparc_icache_flush(&code[2]); |
| code[6] |= ((functionOffset * 8) >> 10); |
| code[7] |= ((functionOffset * 8) & ((1 << 10) - 1)); |
| __glapi_sparc_icache_flush(&code[6]); |
| #else |
| code[0] |= (glapi_addr >> 10); |
| code[1] |= (glapi_addr & ((1 << 10) - 1)); |
| __glapi_sparc_icache_flush(&code[0]); |
| code[2] |= (functionOffset * 4); |
| __glapi_sparc_icache_flush(&code[2]); |
| #endif /* __arch64__ */ |
| } |
| return (_glapi_proc) code; |
| #else |
| (void) functionOffset; |
| return NULL; |
| #endif /* USE_*_ASM */ |
| } |
| |
| |
| /** |
| * This function inserts a new dispatch offset into the assembly language |
| * stub that was generated with the preceeding function. |
| */ |
| static void |
| fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset) |
| { |
| #if defined(USE_X86_ASM) |
| GLubyte * const code = (GLubyte *) entrypoint; |
| |
| #if DISPATCH_FUNCTION_SIZE == 32 |
| *((unsigned int *)(code + 11)) = 4 * offset; |
| *((unsigned int *)(code + 22)) = 4 * offset; |
| #elif DISPATCH_FUNCTION_SIZE == 16 && defined( GLX_USE_TLS ) |
| *((unsigned int *)(code + 8)) = 4 * offset; |
| #elif DISPATCH_FUNCTION_SIZE == 16 |
| *((unsigned int *)(code + 7)) = 4 * offset; |
| #else |
| # error Invalid DISPATCH_FUNCTION_SIZE! |
| #endif |
| |
| #elif defined(USE_SPARC_ASM) |
| |
| /* XXX this hasn't been tested! */ |
| unsigned int *code = (unsigned int *) entrypoint; |
| #ifdef __arch64__ |
| code[6] = 0x05000000; /* sethi %hi(8 * glapioffset), %g2 */ |
| code[7] = 0x8410a000; /* or %g2, %lo(8 * glapioffset), %g2 */ |
| code[6] |= ((offset * 8) >> 10); |
| code[7] |= ((offset * 8) & ((1 << 10) - 1)); |
| __glapi_sparc_icache_flush(&code[6]); |
| #else /* __arch64__ */ |
| code[2] = 0xc6006000; /* ld [%g1 + %lo(4*glapioffset)], %g3 */ |
| code[2] |= (offset * 4); |
| __glapi_sparc_icache_flush(&code[2]); |
| #endif /* __arch64__ */ |
| |
| #else |
| |
| /* an unimplemented architecture */ |
| (void) entrypoint; |
| (void) offset; |
| |
| #endif /* USE_*_ASM */ |
| } |
| |
| |
| /** |
| * 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) { |
| _glapi_proc entrypoint = generate_entrypoint(~0); |
| if (entrypoint != NULL) { |
| entry = & ExtEntryTable[NumExtEntryPoints]; |
| |
| ExtEntryTable[NumExtEntryPoints].name = str_dup(funcName); |
| ExtEntryTable[NumExtEntryPoints].parameter_signature = NULL; |
| ExtEntryTable[NumExtEntryPoints].dispatch_offset = ~0; |
| ExtEntryTable[NumExtEntryPoints].dispatch_stub = entrypoint; |
| 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]. 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 = _gloffset_FIRST_DYNAMIC; |
| 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] || function_names[i][0] != 'g' || function_names[i][1] != 'l') |
| return -1; |
| |
| /* 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) { |
| /* FIXME: Possible memory leak here. |
| */ |
| return -1; |
| } |
| } |
| |
| entry[i]->parameter_signature = str_dup(real_sig); |
| fill_in_entrypoint_offset(entry[i]->dispatch_stub, offset); |
| entry[i]->dispatch_offset = offset; |
| } |
| } |
| |
| return offset; |
| } |
| |
| |
| /** |
| * Return offset of entrypoint for named function within dispatch table. |
| */ |
| PUBLIC GLint |
| _glapi_get_proc_offset(const char *funcName) |
| { |
| /* search extension functions first */ |
| GLuint i; |
| for (i = 0; i < NumExtEntryPoints; i++) { |
| if (strcmp(ExtEntryTable[i].name, funcName) == 0) { |
| return ExtEntryTable[i].dispatch_offset; |
| } |
| } |
| /* search static functions */ |
| return get_static_proc_offset(funcName); |
| } |
| |
| |
| |
| /** |
| * Return pointer to the named function. If the function name isn't found |
| * in the name of static functions, try generating a new API entrypoint on |
| * the fly with assembly language. |
| */ |
| _glapi_proc |
| _glapi_get_proc_address(const char *funcName) |
| { |
| struct _glapi_function * entry; |
| GLuint i; |
| |
| #ifdef MANGLE |
| if (funcName[0] != 'm' || funcName[1] != 'g' || funcName[2] != 'l') |
| return NULL; |
| #else |
| if (funcName[0] != 'g' || funcName[1] != 'l') |
| return NULL; |
| #endif |
| |
| /* search extension functions first */ |
| for (i = 0; i < NumExtEntryPoints; i++) { |
| if (strcmp(ExtEntryTable[i].name, funcName) == 0) { |
| return ExtEntryTable[i].dispatch_stub; |
| } |
| } |
| |
| #if !defined( XFree86Server ) && !defined( XGLServer ) |
| /* search static functions */ |
| { |
| const _glapi_proc func = get_static_proc_address(funcName); |
| if (func) |
| return func; |
| } |
| #endif /* !defined( XFree86Server ) */ |
| |
| entry = add_function_name(funcName); |
| return (entry == NULL) ? NULL : entry->dispatch_stub; |
| } |
| |
| |
| |
| /** |
| * Return the name of the function at the given dispatch offset. |
| * This is only intended for debugging. |
| */ |
| const char * |
| _glapi_get_proc_name(GLuint offset) |
| { |
| GLuint i; |
| const char * n; |
| |
| /* search built-in functions */ |
| n = get_static_proc_name(offset); |
| if ( n != NULL ) { |
| return n; |
| } |
| |
| /* search added extension functions */ |
| for (i = 0; i < NumExtEntryPoints; i++) { |
| if (ExtEntryTable[i].dispatch_offset == offset) { |
| return ExtEntryTable[i].name; |
| } |
| } |
| 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; |
| } |
| |
| |
| |
| /** |
| * Make sure there are no NULL pointers in the given dispatch table. |
| * Intended for debugging purposes. |
| */ |
| void |
| _glapi_check_table(const struct _glapi_table *table) |
| { |
| #ifdef 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]); |
| } |
| |
| /* Do some spot checks to be sure that the dispatch table |
| * slots are assigned correctly. |
| */ |
| { |
| GLuint BeginOffset = _glapi_get_proc_offset("glBegin"); |
| char *BeginFunc = (char*) &table->Begin; |
| GLuint offset = (BeginFunc - (char *) table) / sizeof(void *); |
| assert(BeginOffset == _gloffset_Begin); |
| assert(BeginOffset == offset); |
| } |
| { |
| GLuint viewportOffset = _glapi_get_proc_offset("glViewport"); |
| char *viewportFunc = (char*) &table->Viewport; |
| GLuint offset = (viewportFunc - (char *) table) / sizeof(void *); |
| assert(viewportOffset == _gloffset_Viewport); |
| assert(viewportOffset == offset); |
| } |
| { |
| GLuint VertexPointerOffset = _glapi_get_proc_offset("glVertexPointer"); |
| char *VertexPointerFunc = (char*) &table->VertexPointer; |
| GLuint offset = (VertexPointerFunc - (char *) table) / sizeof(void *); |
| assert(VertexPointerOffset == _gloffset_VertexPointer); |
| assert(VertexPointerOffset == offset); |
| } |
| { |
| GLuint ResetMinMaxOffset = _glapi_get_proc_offset("glResetMinmax"); |
| char *ResetMinMaxFunc = (char*) &table->ResetMinmax; |
| GLuint offset = (ResetMinMaxFunc - (char *) table) / sizeof(void *); |
| assert(ResetMinMaxOffset == _gloffset_ResetMinmax); |
| assert(ResetMinMaxOffset == offset); |
| } |
| { |
| GLuint blendColorOffset = _glapi_get_proc_offset("glBlendColor"); |
| char *blendColorFunc = (char*) &table->BlendColor; |
| GLuint offset = (blendColorFunc - (char *) table) / sizeof(void *); |
| assert(blendColorOffset == _gloffset_BlendColor); |
| assert(blendColorOffset == offset); |
| } |
| { |
| GLuint secondaryColor3fOffset = _glapi_get_proc_offset("glSecondaryColor3fEXT"); |
| char *secondaryColor3fFunc = (char*) &table->SecondaryColor3fEXT; |
| GLuint offset = (secondaryColor3fFunc - (char *) table) / sizeof(void *); |
| assert(secondaryColor3fOffset == _gloffset_SecondaryColor3fEXT); |
| assert(secondaryColor3fOffset == offset); |
| } |
| { |
| GLuint pointParameterivOffset = _glapi_get_proc_offset("glPointParameterivNV"); |
| char *pointParameterivFunc = (char*) &table->PointParameterivNV; |
| GLuint offset = (pointParameterivFunc - (char *) table) / sizeof(void *); |
| assert(pointParameterivOffset == _gloffset_PointParameterivNV); |
| assert(pointParameterivOffset == offset); |
| } |
| { |
| GLuint setFenceOffset = _glapi_get_proc_offset("glSetFenceNV"); |
| char *setFenceFunc = (char*) &table->SetFenceNV; |
| GLuint offset = (setFenceFunc - (char *) table) / sizeof(void *); |
| assert(setFenceOffset == _gloffset_SetFenceNV); |
| assert(setFenceOffset == offset); |
| } |
| #else |
| (void) table; |
| #endif |
| } |
| |
| |
| #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) */ |