diff options
Diffstat (limited to 'mesalib/src/mesa/glapi/glapi.c')
| -rw-r--r-- | mesalib/src/mesa/glapi/glapi.c | 650 |
1 files changed, 650 insertions, 0 deletions
diff --git a/mesalib/src/mesa/glapi/glapi.c b/mesalib/src/mesa/glapi/glapi.c new file mode 100644 index 000000000..e36fccb35 --- /dev/null +++ b/mesalib/src/mesa/glapi/glapi.c @@ -0,0 +1,650 @@ +/* + * 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> +#define PUBLIC + +#else + +#include "main/glheader.h" + +#endif + +#include "main/compiler.h" + +#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; + +/* + * 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 !defined(_WIN32_WCE) + if ((WarnFlag || getenv("MESA_DEBUG") || getenv("LIBGL_DEBUG")) + && warning_func) { + return GL_TRUE; + } + else { + return GL_FALSE; + } +#else + return GL_FALSE; +#endif +} + + +#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) + +#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 + +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) */ +/*@}*/ + + + + +/** + * 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) + static unsigned long knownID; + static GLboolean firstCall = GL_TRUE; + + if (ThreadSafe) + return; + + CHECK_MULTITHREAD_LOCK(); + if (firstCall) { + /* initialize TSDs */ + (void) _glthread_GetTSD(&ContextTSD); + (void) _glthread_GetTSD(&_gl_DispatchTSD); + + 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(); +#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 +} + +#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 */ + + +#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 + +#ifdef USE_SPARC_ASM +#ifdef GLX_USE_TLS +extern unsigned int __glapi_sparc_tls_stub; +#else +extern unsigned int __glapi_sparc_pthread_stub; +#endif +#endif + +#if !defined(DISPATCH_FUNCTION_SIZE) && !defined(XFree86Server) && !defined(XGLServer) +# define NEED_FUNCTION_POINTER +#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 +#ifdef USE_SPARC_ASM + extern void __glapi_sparc_icache_flush(unsigned int *); + 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 long __glapi_sparc_get_dispatch(void); + unsigned int *code = &__glapi_sparc_tls_stub; + unsigned long dispatch = __glapi_sparc_get_dispatch(); +#else + 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 + +#if defined(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 +} +#endif /* defined(PTHREADS) || defined(GLX_USE_TLS) */ + + +/** + * 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 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) + + +/** + * 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 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]); + } + + /* 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 +} |