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xenocara/xserver/glx/glapi.c

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/*
* 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>
#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].
*
* \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 GL_FALSE;
/* Determine if the named function already exists. If the function does
* exist, it must have the same parameter signature as the function
* being added.
*/
new_offset = get_static_proc_offset(function_names[i]);
if (new_offset >= 0) {
/* FIXME: Make sure the parameter signatures match! How do we get
* FIXME: the parameter signature for static functions?
*/
if ( (offset != ~0) && (new_offset != offset) ) {
return -1;
}
is_static[i] = GL_TRUE;
offset = new_offset;
}
for ( j = 0 ; j < NumExtEntryPoints ; j++ ) {
if (strcmp(ExtEntryTable[j].name, function_names[i]) == 0) {
/* The offset may be ~0 if the function name was added by
* glXGetProcAddress but never filled in by the driver.
*/
if (ExtEntryTable[j].dispatch_offset != ~0) {
if (strcmp(real_sig, ExtEntryTable[j].parameter_signature)
!= 0) {
return -1;
}
if ( (offset != ~0) && (ExtEntryTable[j].dispatch_offset != offset) ) {
return -1;
}
offset = ExtEntryTable[j].dispatch_offset;
}
entry[i] = & ExtEntryTable[j];
break;
}
}
}
if (offset == ~0) {
offset = next_dynamic_offset;
next_dynamic_offset++;
}
for ( i = 0 ; function_names[i] != NULL ; i++ ) {
if (! is_static[i] ) {
if (entry[i] == NULL) {
entry[i] = add_function_name( function_names[i] );
if (entry[i] == NULL) {
/* 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) */
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