-
/*
* Mesa 3-D graphics library
- * Version: 4.1
+ * Version: 6.3
*
- * Copyright (C) 1999-2002 Brian Paul All Rights Reserved.
+ * Copyright (C) 1999-2003 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"),
static GLboolean WarnFlag = GL_FALSE;
static _glapi_warning_func warning_func;
+static void init_glapi_relocs(void);
+
+static _glapi_proc generate_entrypoint(GLuint functionOffset);
+static void fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset);
/*
* Enable/disable printing of warning messages.
*/
-void
+PUBLIC void
_glapi_noop_enable_warnings(GLboolean enable)
{
WarnFlag = enable;
/*
* Register a callback function for reporting errors.
*/
-void
+PUBLIC void
_glapi_set_warning_func( _glapi_warning_func func )
{
warning_func = func;
#define F NULL
-#define DISPATCH(func, args, msg) \
- if (warn()) { \
- warning_func(NULL, "GL User Error: called without context:"); \
- warning_func msg; \
+#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:"); \
- warning_func msg; \
- } \
+#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 __usused_noop_functions
+#define UNUSED_TABLE_NAME __unused_noop_functions
-#define TABLE_ENTRY(name) (void *) NoOp##name
+#define TABLE_ENTRY(name) (_glapi_proc) NoOp##name
-static int NoOpUnused(void)
+static GLint NoOpUnused(void)
{
if (warn()) {
warning_func(NULL, "GL User Error: calling extension function without a current context\n");
#if defined(THREADS)
+#if defined(GLX_USE_TLS)
+
+__thread struct _glapi_table * _glapi_tls_Dispatch
+ __attribute__((tls_model("initial-exec")))
+ = (struct _glapi_table *) __glapi_noop_table;
+
+static __thread struct _glapi_table * _glapi_tls_RealDispatch
+ __attribute__((tls_model("initial-exec")))
+ = (struct _glapi_table *) __glapi_noop_table;
+
+__thread void * _glapi_tls_Context
+ __attribute__((tls_model("initial-exec")));
+
+/**
+ * Legacy per-thread dispatch pointer. This is only needed to support
+ * non-TLS DRI drivers.
+ */
+
+_glthread_TSD _gl_DispatchTSD;
+
+#else
+
/**
* \name Multi-threaded control support variables
*
* 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_FALSE, is used to determin whether or not the application is
+ * \c GL_TRUE, is used to determine whether or not the application is
* multithreaded.
*/
/*@{*/
static _glthread_TSD ContextTSD; /**< Per-thread context pointer */
/*@}*/
+#endif /* defined(GLX_USE_TLS) */
#define DISPATCH_TABLE_NAME __glapi_threadsafe_table
-#define UNUSED_TABLE_NAME __usused_threadsafe_functions
+#define UNUSED_TABLE_NAME __unused_threadsafe_functions
-#define TABLE_ENTRY(name) (void *) gl##name
+#define TABLE_ENTRY(name) (_glapi_proc) gl##name
-static int glUnused(void)
+static GLint glUnused(void)
{
return 0;
}
/***** END THREAD-SAFE DISPATCH *****/
+#if defined(GLX_USE_TLS)
-struct _glapi_table *_glapi_Dispatch = (struct _glapi_table *) __glapi_noop_table;
+/**
+ * \name Old dispatch pointers
+ *
+ * Very old DRI based drivers assume that \c _glapi_Dispatch will never be
+ * \c NULL. Becuase of that, special "thread-safe" dispatch functions are
+ * needed here. Slightly more recent drivers detect the multi-threaded case
+ * by \c _glapi_DispatchTSD being \c NULL.
+ *
+ * \deprecated
+ *
+ * \warning
+ * \c _glapi_RealDispatch does not exist in TLS builds. I don't think it was
+ * ever used outside libGL.so, so this should be safe.
+ */
+/*@{*/
+PUBLIC const struct _glapi_table *_glapi_Dispatch = (struct _glapi_table *) __glapi_threadsafe_table;
+PUBLIC const struct _glapi_table *_glapi_DispatchTSD = NULL;
+PUBLIC const void *_glapi_Context = NULL;
+/*@}*/
+
+#else
+
+PUBLIC struct _glapi_table *_glapi_Dispatch = (struct _glapi_table *) __glapi_noop_table;
#if defined( THREADS )
-struct _glapi_table *_glapi_DispatchTSD = (struct _glapi_table *) __glapi_noop_table;
+PUBLIC struct _glapi_table *_glapi_DispatchTSD = (struct _glapi_table *) __glapi_noop_table;
#endif
-struct _glapi_table *_glapi_RealDispatch = (struct _glapi_table *) __glapi_noop_table;
-
+PUBLIC struct _glapi_table *_glapi_RealDispatch = (struct _glapi_table *) __glapi_noop_table;
/* Used when thread safety disabled */
-void *_glapi_Context = NULL;
+PUBLIC void *_glapi_Context = NULL;
+
+#endif /* defined(GLX_USE_TLS) */
static GLboolean DispatchOverride = GL_FALSE;
-/* strdup() is actually not a standard ANSI C or POSIX routine.
+/**
+ * strdup() is actually not a standard ANSI C or POSIX routine.
* Irix will not define it if ANSI mode is in effect.
*/
static char *
-/*
+/**
* We should call this periodically from a function such as glXMakeCurrent
* in order to test if multiple threads are being used.
*/
-void
+PUBLIC void
_glapi_check_multithread(void)
{
-#if defined(THREADS)
+#if defined(THREADS) && !defined(GLX_USE_TLS)
if (!ThreadSafe) {
static unsigned long knownID;
static GLboolean firstCall = GL_TRUE;
-/*
+/**
* 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
+PUBLIC void
_glapi_set_context(void *context)
{
-#if defined(THREADS)
+ (void) __unused_noop_functions; /* silence a warning */
+#if defined(GLX_USE_TLS)
+ _glapi_tls_Context = context;
+#elif defined(THREADS)
+ (void) __unused_threadsafe_functions; /* silence a warning */
_glthread_SetTSD(&ContextTSD, context);
_glapi_Context = (ThreadSafe) ? NULL : context;
#else
-/*
+/**
* 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 *
+PUBLIC void *
_glapi_get_context(void)
{
-#if defined(THREADS)
+#if defined(GLX_USE_TLS)
+ return _glapi_tls_Context;
+#elif defined(THREADS)
if (ThreadSafe) {
return _glthread_GetTSD(&ContextTSD);
}
-/*
+/**
* Set the global or per-thread dispatch table pointer.
*/
-void
+PUBLIC void
_glapi_set_dispatch(struct _glapi_table *dispatch)
{
- struct _glapi_table * old_style_dispatch;
-
+#if defined(PTHREADS) || defined(GLX_USE_TLS)
+ static pthread_once_t once_control = PTHREAD_ONCE_INIT;
- /* Use the no-op functions if a NULL dispatch table was requested.
- */
- old_style_dispatch = (dispatch == NULL)
- ? (struct _glapi_table *) __glapi_noop_table : dispatch;
+ pthread_once( & once_control, init_glapi_relocs );
+#endif
+ if (!dispatch) {
+ /* use the no-op functions */
+ dispatch = (struct _glapi_table *) __glapi_noop_table;
+ }
#ifdef DEBUG
- if (dispatch != NULL) {
+ else {
_glapi_check_table(dispatch);
}
#endif
-#if defined(THREADS)
+#if defined(GLX_USE_TLS)
if (DispatchOverride) {
- _glthread_SetTSD(&RealDispatchTSD, (void *) old_style_dispatch);
+ _glapi_tls_RealDispatch = dispatch;
+ }
+ else {
+ _glthread_SetTSD(&_gl_DispatchTSD, (void *) dispatch);
+ _glapi_tls_Dispatch = dispatch;
+ }
+#elif defined(THREADS)
+ if (DispatchOverride) {
+ _glthread_SetTSD(&RealDispatchTSD, (void *) dispatch);
if (ThreadSafe)
_glapi_RealDispatch = (struct _glapi_table*) __glapi_threadsafe_table;
else
}
else {
/* normal operation */
- _glthread_SetTSD(&_gl_DispatchTSD, (void *) old_style_dispatch);
+ _glthread_SetTSD(&_gl_DispatchTSD, (void *) dispatch);
if (ThreadSafe) {
_glapi_Dispatch = (struct _glapi_table *) __glapi_threadsafe_table;
_glapi_DispatchTSD = NULL;
}
else {
- _glapi_Dispatch = old_style_dispatch;
+ _glapi_Dispatch = dispatch;
_glapi_DispatchTSD = dispatch;
}
}
-/*
+/**
* Return pointer to current dispatch table for calling thread.
*/
-struct _glapi_table *
+PUBLIC struct _glapi_table *
_glapi_get_dispatch(void)
{
-#if defined(THREADS)
+#if defined(GLX_USE_TLS)
+ struct _glapi_table * api = (DispatchOverride)
+ ? _glapi_tls_RealDispatch : _glapi_tls_Dispatch;
+
+ assert( api != NULL );
+ return api;
+#elif defined(THREADS)
if (ThreadSafe) {
if (DispatchOverride) {
return (struct _glapi_table *) _glthread_GetTSD(&RealDispatchTSD);
/*
* Return: dispatch override layer number.
*/
-int
+PUBLIC int
_glapi_begin_dispatch_override(struct _glapi_table *override)
{
struct _glapi_table *real = _glapi_get_dispatch();
_glapi_set_dispatch(real);
-#if defined(THREADS)
+#if defined(GLX_USE_TLS)
+ _glthread_SetTSD(&_gl_DispatchTSD, (void *) override);
+ _glapi_tls_Dispatch = override;
+#elif defined(THREADS)
_glthread_SetTSD(&_gl_DispatchTSD, (void *) override);
if ( ThreadSafe ) {
_glapi_Dispatch = (struct _glapi_table *) __glapi_threadsafe_table;
}
-void
+PUBLIC void
_glapi_end_dispatch_override(int layer)
{
struct _glapi_table *real = _glapi_get_dispatch();
DispatchOverride = GL_FALSE;
_glapi_set_dispatch(real);
/* the rest of this isn't needed, just play it safe */
-#if defined(THREADS)
+#if defined(GLX_USE_TLS)
+ _glapi_tls_RealDispatch = NULL;
+#else
+# if defined(THREADS)
_glthread_SetTSD(&RealDispatchTSD, NULL);
-#endif
+# endif
_glapi_RealDispatch = NULL;
+#endif
}
-struct _glapi_table *
+PUBLIC struct _glapi_table *
_glapi_get_override_dispatch(int layer)
{
if (layer == 0) {
}
else {
if (DispatchOverride) {
-#if defined(THREADS)
+#if defined(GLX_USE_TLS)
+ return (struct _glapi_table *) _glapi_tls_Dispatch;
+#elif defined(THREADS)
return (struct _glapi_table *) _glthread_GetTSD(&_gl_DispatchTSD);
#else
return _glapi_Dispatch;
}
-struct name_address_offset {
- const char *Name;
- GLvoid *Address;
- GLuint Offset;
-};
-
-
#if !defined( USE_X86_ASM )
#define NEED_FUNCTION_POINTER
#endif
#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 )
{
- unsigned i;
+ GLuint i;
- for ( i = 0 ; static_functions[i].Name_offset >= 0 ; i++ ) {
+ for (i = 0; static_functions[i].Name_offset >= 0; i++) {
const char * test_name;
test_name = gl_string_table + static_functions[i].Name_offset;
return NULL;
}
-/*
+
+/**
* Return dispatch table offset of the named static (built-in) function.
* Return -1 if function not found.
*/
#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
-# if defined(PTHREADS)
+# if defined(THREADS) && !defined(GLX_USE_TLS)
# define X86_DISPATCH_FUNCTION_SIZE 32
# else
# define X86_DISPATCH_FUNCTION_SIZE 16
# endif
-/*
+/**
* Return dispatch function address the named static (built-in) function.
* Return NULL if function not found.
*/
-static const GLvoid *
+static const _glapi_proc
get_static_proc_address(const char *funcName)
{
const glprocs_table_t * const f = find_entry( funcName );
if ( f != NULL ) {
- return gl_dispatch_functions_start
- + (X86_DISPATCH_FUNCTION_SIZE * f->Offset);
+ return (_glapi_proc) (gl_dispatch_functions_start
+ + (X86_DISPATCH_FUNCTION_SIZE * f->Offset));
}
else {
return NULL;
#else
-/*
- * Return dispatch function address the named static (built-in) function.
- * Return NULL if function not found.
+/**
+ * Return pointer to the named static (built-in) function.
+ * \return NULL if function not found.
*/
-static const GLvoid *
+static const _glapi_proc
get_static_proc_address(const char *funcName)
{
const glprocs_table_t * const f = find_entry( funcName );
#endif /* USE_X86_ASM */
+/**
+ * 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 )
{
- unsigned i;
+ GLuint i;
- for ( i = 0 ; static_functions[i].Name_offset >= 0 ; 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;
}
/*
- * The disptach table size (number of entries) is the sizeof the
+ * 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)
-static struct name_address_offset ExtEntryTable[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 void *
+static _glapi_proc
generate_entrypoint(GLuint functionOffset)
{
#if defined(USE_X86_ASM)
- /*
- * This x86 code contributed by Josh Vanderhoof.
- *
- * 0: a1 10 32 54 76 movl __glapi_Dispatch,%eax
- * 00 01 02 03 04
- * 5: 85 c0 testl %eax,%eax
- * 05 06
- * 7: 74 06 je f <entrypoint+0xf>
- * 07 08
- * 9: ff a0 10 32 54 76 jmp *0x76543210(%eax)
- * 09 0a 0b 0c 0d 0e
- * f: e8 fc ff ff ff call __glapi_get_dispatch
- * 0f 10 11 12 13
- * 14: ff a0 10 32 54 76 jmp *0x76543210(%eax)
- * 14 15 16 17 18 19
+ /* 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.
*/
- static const unsigned char insn_template[] = {
- 0xa1, 0x00, 0x00, 0x00, 0x00,
- 0x85, 0xc0,
- 0x74, 0x06,
- 0xff, 0xa0, 0x00, 0x00, 0x00, 0x00,
- 0xe8, 0x00, 0x00, 0x00, 0x00,
- 0xff, 0xa0, 0x00, 0x00, 0x00, 0x00
- };
- unsigned char *code = (unsigned char *) malloc(sizeof(insn_template));
- unsigned int next_insn;
- if (code) {
- memcpy(code, insn_template, sizeof(insn_template));
+ const GLubyte * const template_func = gl_dispatch_functions_start
+ + (X86_DISPATCH_FUNCTION_SIZE * 32);
+ GLubyte * const code = (GLubyte *) malloc( X86_DISPATCH_FUNCTION_SIZE );
-#if defined( THREADS )
- *(unsigned int *)(code + 0x01) = (unsigned int)&_glapi_DispatchTSD;
-#else
- *(unsigned int *)(code + 0x01) = (unsigned int)&_glapi_Dispatch;
-#endif
- *(unsigned int *)(code + 0x0b) = (unsigned int)functionOffset * 4;
- next_insn = (unsigned int)(code + 0x14);
- *(unsigned int *)(code + 0x10) = (unsigned int)_glapi_get_dispatch - next_insn;
- *(unsigned int *)(code + 0x16) = (unsigned int)functionOffset * 4;
+
+ if ( code != NULL ) {
+ (void) memcpy( code, template_func, X86_DISPATCH_FUNCTION_SIZE );
+ fill_in_entrypoint_offset( (_glapi_proc) code, functionOffset );
}
- return code;
+
+ return (_glapi_proc) code;
#elif defined(USE_SPARC_ASM)
-#if defined(__sparc_v9__) && !defined(__linux__)
+#ifdef __arch64__
static const unsigned int insn_template[] = {
0x05000000, /* sethi %uhi(_glapi_Dispatch), %g2 */
0x03000000, /* sethi %hi(_glapi_Dispatch), %g1 */
if (code) {
memcpy(code, insn_template, sizeof(insn_template));
-#if defined(__sparc_v9__) && !defined(__linux__)
+#ifdef __arch64__
code[0] |= (glapi_addr >> (32 + 10));
code[1] |= ((glapi_addr & 0xffffffff) >> 10);
__glapi_sparc_icache_flush(&code[0]);
__glapi_sparc_icache_flush(&code[2]);
#endif
}
- return code;
+ 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(void *entrypoint, GLuint offset)
+fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset)
{
#if defined(USE_X86_ASM)
-
- unsigned char *code = (unsigned char *) entrypoint;
- *(unsigned int *)(code + 0x0b) = offset * 4;
- *(unsigned int *)(code + 0x16) = offset * 4;
+ GLubyte * const code = (GLubyte *) entrypoint;
+
+
+#if X86_DISPATCH_FUNCTION_SIZE == 32
+ *((unsigned int *)(code + 11)) = 4 * offset;
+ *((unsigned int *)(code + 22)) = 4 * offset;
+#elif X86_DISPATCH_FUNCTION_SIZE == 16 && defined( GLX_USE_TLS )
+ *((unsigned int *)(code + 8)) = 4 * offset;
+#elif X86_DISPATCH_FUNCTION_SIZE == 16
+ *((unsigned int *)(code + 7)) = 4 * offset;
+#else
+# error Invalid X86_DISPATCH_FUNCTION_SIZE!
+#endif
#elif defined(USE_SPARC_ASM)
/* XXX this hasn't been tested! */
unsigned int *code = (unsigned int *) entrypoint;
-#if defined(__sparc_v9__) && !defined(__linux__)
+#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 /* __sparc_v9__ && !linux */
+#else /* __arch64__ */
code[2] = 0xc6006000; /* ld [%g1 + %lo(4*glapioffset)], %g3 */
code[2] |= (offset * 4);
__glapi_sparc_icache_flush(&code[2]);
-#endif /* __sparc_v9__ && !linux */
+#endif /* __arch64__ */
+
+#else
+
+ /* an unimplemented architecture */
+ (void) entrypoint;
+ (void) offset;
#endif /* USE_*_ASM */
}
-/*
- * Add a new extension function entrypoint.
- * Return: GL_TRUE = success or GL_FALSE = failure
+/**
+ * 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.
*/
-GLboolean
-_glapi_add_entrypoint(const char *funcName, GLuint offset)
+
+PUBLIC int
+_glapi_add_dispatch( const char * const * function_names,
+ const char * parameter_signature )
{
- /* trivial rejection test */
+ 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.
+ */
+
#ifdef MANGLE
- if (!funcName || funcName[0] != 'm' || funcName[1] != 'g' || funcName[2] != 'l')
- return NULL;
+ if (!function_names[i] || function_names[i][0] != 'm' || function_names[i][1] != 'g' || function_names[i][2] != 'l')
+ return GL_FALSE;
#else
- if (!funcName || funcName[0] != 'g' || funcName[1] != 'l')
- return GL_FALSE;
+ if (!function_names[i] || function_names[i][0] != 'g' || function_names[i][1] != 'l')
+ return GL_FALSE;
#endif
-
- /* first check if the named function is already statically present */
- {
- GLint index = get_static_proc_offset(funcName);
- if (index >= 0) {
- return (GLboolean) ((GLuint) index == offset); /* bad offset! */
+
+
+ /* 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;
}
- }
-
- /* See if this function has already been dynamically added */
- {
- GLuint i;
- for (i = 0; i < NumExtEntryPoints; i++) {
- if (strcmp(ExtEntryTable[i].Name, funcName) == 0) {
- /* function already registered */
- if (ExtEntryTable[i].Offset == offset) {
- return GL_TRUE; /* offsets match */
- }
- else if (ExtEntryTable[i].Offset == (GLuint) ~0
- && offset < DISPATCH_TABLE_SIZE) {
- /* need to patch-up the dispatch code */
- if (offset != (GLuint) ~0) {
- fill_in_entrypoint_offset(ExtEntryTable[i].Address, offset);
- ExtEntryTable[i].Offset = offset;
- }
- return GL_TRUE;
- }
- else {
- return GL_FALSE; /* bad 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;
+ }
}
}
- /* This is a new function, try to add it. */
- if (NumExtEntryPoints >= MAX_EXTENSION_FUNCS ||
- offset >= DISPATCH_TABLE_SIZE) {
- /* No space left */
- return GL_FALSE;
+
+ if (offset == ~0) {
+ offset = next_dynamic_offset;
+ next_dynamic_offset++;
}
- else {
- void *entrypoint = generate_entrypoint(offset);
- if (!entrypoint)
- return GL_FALSE; /* couldn't generate assembly */
- /* OK! */
- ExtEntryTable[NumExtEntryPoints].Name = str_dup(funcName);
- ExtEntryTable[NumExtEntryPoints].Offset = offset;
- ExtEntryTable[NumExtEntryPoints].Address = entrypoint;
- NumExtEntryPoints++;
- return GL_TRUE; /* success */
- }
+ 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;
+ }
+ }
+
- /* should never get here, silence compiler warnings */
- return GL_FALSE;
+ 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.
*/
-GLint
+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].Offset;
+ if (strcmp(ExtEntryTable[i].name, funcName) == 0) {
+ return ExtEntryTable[i].dispatch_offset;
}
}
-/*
- * Return entrypoint for named function.
+/**
+ * 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.
*/
-const GLvoid *
+PUBLIC _glapi_proc
_glapi_get_proc_address(const char *funcName)
{
+ struct _glapi_function * entry;
GLuint i;
#ifdef MANGLE
/* search extension functions first */
for (i = 0; i < NumExtEntryPoints; i++) {
- if (strcmp(ExtEntryTable[i].Name, funcName) == 0) {
- return ExtEntryTable[i].Address;
+ if (strcmp(ExtEntryTable[i].name, funcName) == 0) {
+ return ExtEntryTable[i].dispatch_stub;
}
}
/* search static functions */
{
- const GLvoid *func = get_static_proc_address(funcName);
+ const _glapi_proc func = get_static_proc_address(funcName);
if (func)
return func;
}
- /* generate new entrypoint - use a temporary dispatch offset of
- * ~0 (i.e. -1). Later, when the driver calls _glapi_add_entrypoint()
- * 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.
- */
- if (NumExtEntryPoints < MAX_EXTENSION_FUNCS) {
- GLvoid *entrypoint = generate_entrypoint(~0);
- if (!entrypoint)
- return GL_FALSE;
-
- ExtEntryTable[NumExtEntryPoints].Name = str_dup(funcName);
- ExtEntryTable[NumExtEntryPoints].Offset = ~0;
- ExtEntryTable[NumExtEntryPoints].Address = entrypoint;
- NumExtEntryPoints++;
-
- return entrypoint;
- }
- else {
- /* no space for new functions! */
- return NULL;
- }
+ 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 *
+PUBLIC const char *
_glapi_get_proc_name(GLuint offset)
{
GLuint i;
/* search added extension functions */
for (i = 0; i < NumExtEntryPoints; i++) {
- if (ExtEntryTable[i].Offset == offset) {
- return ExtEntryTable[i].Name;
+ if (ExtEntryTable[i].dispatch_offset == offset) {
+ return ExtEntryTable[i].name;
}
}
return NULL;
-/*
+/**
* Return size of dispatch table struct as number of functions (or
* slots).
*/
-GLuint
+PUBLIC GLuint
_glapi_get_dispatch_table_size(void)
{
return DISPATCH_TABLE_SIZE;
-/*
+/**
* Get API dispatcher version string.
*/
-const char *
+PUBLIC const char *
_glapi_get_version(void)
{
return "20021001"; /* YYYYMMDD */
-/*
+/**
* Make sure there are no NULL pointers in the given dispatch table.
* Intended for debugging purposes.
*/
-void
+PUBLIC void
_glapi_check_table(const struct _glapi_table *table)
{
#ifdef DEBUG
GLuint offset = (secondaryColor3fFunc - (char *) table) / sizeof(void *);
assert(secondaryColor3fOffset == _gloffset_SecondaryColor3fEXT);
assert(secondaryColor3fOffset == offset);
- assert(_glapi_get_proc_address("glSecondaryColor3fEXT") == (void *) &glSecondaryColor3fEXT);
+ assert(_glapi_get_proc_address("glSecondaryColor3fEXT") == (_glapi_proc) &glSecondaryColor3fEXT);
}
{
GLuint pointParameterivOffset = _glapi_get_proc_offset("glPointParameterivNV");
GLuint offset = (pointParameterivFunc - (char *) table) / sizeof(void *);
assert(pointParameterivOffset == _gloffset_PointParameterivNV);
assert(pointParameterivOffset == offset);
- assert(_glapi_get_proc_address("glPointParameterivNV") == (void *) &glPointParameterivNV);
+ assert(_glapi_get_proc_address("glPointParameterivNV") == (_glapi_proc) &glPointParameterivNV);
}
{
GLuint setFenceOffset = _glapi_get_proc_offset("glSetFenceNV");
GLuint offset = (setFenceFunc - (char *) table) / sizeof(void *);
assert(setFenceOffset == _gloffset_SetFenceNV);
assert(setFenceOffset == offset);
- assert(_glapi_get_proc_address("glSetFenceNV") == (void *) &glSetFenceNV);
+ assert(_glapi_get_proc_address("glSetFenceNV") == (_glapi_proc) &glSetFenceNV);
}
+#else
+ (void) table;
#endif
}
+
+
+/**
+ * Perform platform-specific GL API entry-point fixups.
+ *
+ *
+ */
+static void
+init_glapi_relocs( void )
+{
+#if defined( USE_X86_ASM ) && defined( GLX_USE_TLS )
+ extern void * _x86_get_dispatch(void);
+ const GLubyte * const get_disp = (const GLubyte *) _x86_get_dispatch;
+ GLubyte * curr_func = (GLubyte *) gl_dispatch_functions_start;
+
+
+ while ( curr_func != (GLubyte *) gl_dispatch_functions_end ) {
+ (void) memcpy( curr_func, get_disp, 6 );
+ curr_func += X86_DISPATCH_FUNCTION_SIZE;
+ }
+#endif /* defined( USE_X86_ASM ) && defined( GLX_USE_TLS ) */
+}
projects / mesa.git / blobdiff