aboutsummaryrefslogtreecommitdiff
path: root/xorg-server/glx/glapi.c
diff options
context:
space:
mode:
Diffstat (limited to 'xorg-server/glx/glapi.c')
-rw-r--r--xorg-server/glx/glapi.c1032
1 files changed, 516 insertions, 516 deletions
diff --git a/xorg-server/glx/glapi.c b/xorg-server/glx/glapi.c
index c11454b1f..481d59f81 100644
--- a/xorg-server/glx/glapi.c
+++ b/xorg-server/glx/glapi.c
@@ -1,516 +1,516 @@
-/*
- * 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. There are functions
- * to set/get the current dispatch table for the current thread and to
- * manage registration/dispatch of dynamically added extension functions.
- *
- * This code was originally general enough to be shared with Mesa, but
- * they diverged long ago, so this is now just enough support to make
- * indirect GLX work.
- */
-
-#include <dix-config.h>
-#include <X11/Xfuncproto.h>
-#include <os.h>
-#ifdef _MSC_VER
-#define PUBLIC _declspec(dllexport)
-#else
-#define PUBLIC _X_EXPORT
-#endif
-
-#include <stdlib.h>
-#include <string.h>
-#ifdef DEBUG
-#include <assert.h>
-#endif
-#include <unistd.h>
-
-#include "glapi.h"
-#include "glapitable.h"
-
-#define _gloffset_FIRST_DYNAMIC (sizeof(struct _glapi_table) / sizeof(void *))
-
-#if defined(PTHREADS) || defined(GLX_USE_TLS)
-static void init_glapi_relocs(void);
-#endif
-
-/**
- * \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.
- *
- * 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 TLS struct _glapi_table * _glapi_tls_Dispatch = NULL;
-
-PUBLIC TLS void * _glapi_tls_Context;
-
-PUBLIC const struct _glapi_table *_glapi_Dispatch = NULL;
-PUBLIC const void *_glapi_Context = NULL;
-
-#else
-
-#if defined(THREADS)
-
-_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 = NULL;
-PUBLIC void *_glapi_Context = NULL;
-
-#endif /* defined(GLX_USE_TLS) */
-/*@}*/
-
-/*
- * xserver's gl is not multithreaded, we promise.
- */
-PUBLIC void
-_glapi_check_multithread(void)
-{
-}
-
-/**
- * Set the current context pointer for this thread.
- * The context pointer is an opaque type which should be cast to
- * void from the real context pointer type.
- */
-void
-_glapi_set_context(void *context)
-{
-#if defined(GLX_USE_TLS)
- _glapi_tls_Context = context;
-#elif defined(THREADS)
- _glthread_SetTSD(&ContextTSD, context);
- _glapi_Context = context;
-#else
- _glapi_Context = context;
-#endif
-}
-
-
-
-/**
- * Get the current context pointer for this thread.
- * The context pointer is an opaque type which should be cast from
- * void to the real context pointer type.
- */
-void *
-_glapi_get_context(void)
-{
-#if defined(GLX_USE_TLS)
- return _glapi_tls_Context;
-#else
- return _glapi_Context;
-#endif
-}
-
-
-
-/**
- * Set the global or per-thread dispatch table pointer.
- */
-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 defined(GLX_USE_TLS)
- _glapi_tls_Dispatch = dispatch;
-#elif defined(THREADS)
- _glthread_SetTSD(&_gl_DispatchTSD, (void *) dispatch);
- _glapi_Dispatch = dispatch;
-#else /*THREADS*/
- _glapi_Dispatch = dispatch;
-#endif /*THREADS*/
-}
-
-
-
-/**
- * Return pointer to current dispatch table for calling thread.
- */
-struct _glapi_table *
-_glapi_get_dispatch(void)
-{
- struct _glapi_table * api;
-#if defined(GLX_USE_TLS)
- api = _glapi_tls_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
-
-
-/* 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;
-}
-
-
-
-/**********************************************************************
- * 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;
-};
-
-static struct _glapi_function ExtEntryTable[MAX_EXTENSION_FUNCS];
-static GLuint NumExtEntryPoints = 0;
-
-/**
- * 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) {
- entry = &ExtEntryTable[NumExtEntryPoints];
-
- ExtEntryTable[NumExtEntryPoints].name = strdup(funcName);
- ExtEntryTable[NumExtEntryPoints].parameter_signature = NULL;
- ExtEntryTable[NumExtEntryPoints].dispatch_offset = ~0;
- 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][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)
- return -1;
- }
-
- entry[i]->parameter_signature = strdup(real_sig);
- entry[i]->dispatch_offset = offset;
- }
- }
-
- return offset;
-}
-
-/*
- * glXGetProcAddress doesn't exist in the protocol, the drivers never call
- * this themselves, and neither does the server. warn if it happens though.
- */
-_GLAPI_EXPORT _glapi_proc
-_glapi_get_proc_address(const char *funcName)
-{
- ErrorF("_glapi_get_proc_address called!\n");
- return NULL;
-}
-
-/**
- * Return size of dispatch table struct as number of functions (or
- * slots).
- */
-GLuint
-_glapi_get_dispatch_table_size(void)
-{
- return DISPATCH_TABLE_SIZE;
-}
-
-#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) */
+/*
+ * 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. There are functions
+ * to set/get the current dispatch table for the current thread and to
+ * manage registration/dispatch of dynamically added extension functions.
+ *
+ * This code was originally general enough to be shared with Mesa, but
+ * they diverged long ago, so this is now just enough support to make
+ * indirect GLX work.
+ */
+
+#include <dix-config.h>
+#include <X11/Xfuncproto.h>
+#include <os.h>
+#ifdef _MSC_VER
+#define PUBLIC _declspec(dllexport)
+#else
+#define PUBLIC _X_EXPORT
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+#ifdef DEBUG
+#include <assert.h>
+#endif
+#include <unistd.h>
+
+#include "glapi.h"
+#include "glapitable.h"
+
+#define _gloffset_FIRST_DYNAMIC (sizeof(struct _glapi_table) / sizeof(void *))
+
+#if defined(PTHREADS) || defined(GLX_USE_TLS)
+static void init_glapi_relocs(void);
+#endif
+
+/**
+ * \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.
+ *
+ * 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 TLS struct _glapi_table * _glapi_tls_Dispatch = NULL;
+
+PUBLIC TLS void * _glapi_tls_Context;
+
+PUBLIC const struct _glapi_table *_glapi_Dispatch = NULL;
+PUBLIC const void *_glapi_Context = NULL;
+
+#else
+
+#if defined(THREADS)
+
+_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 = NULL;
+PUBLIC void *_glapi_Context = NULL;
+
+#endif /* defined(GLX_USE_TLS) */
+/*@}*/
+
+/*
+ * xserver's gl is not multithreaded, we promise.
+ */
+PUBLIC void
+_glapi_check_multithread(void)
+{
+}
+
+/**
+ * Set the current context pointer for this thread.
+ * The context pointer is an opaque type which should be cast to
+ * void from the real context pointer type.
+ */
+void
+_glapi_set_context(void *context)
+{
+#if defined(GLX_USE_TLS)
+ _glapi_tls_Context = context;
+#elif defined(THREADS)
+ _glthread_SetTSD(&ContextTSD, context);
+ _glapi_Context = context;
+#else
+ _glapi_Context = context;
+#endif
+}
+
+
+
+/**
+ * Get the current context pointer for this thread.
+ * The context pointer is an opaque type which should be cast from
+ * void to the real context pointer type.
+ */
+void *
+_glapi_get_context(void)
+{
+#if defined(GLX_USE_TLS)
+ return _glapi_tls_Context;
+#else
+ return _glapi_Context;
+#endif
+}
+
+
+
+/**
+ * Set the global or per-thread dispatch table pointer.
+ */
+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 defined(GLX_USE_TLS)
+ _glapi_tls_Dispatch = dispatch;
+#elif defined(THREADS)
+ _glthread_SetTSD(&_gl_DispatchTSD, (void *) dispatch);
+ _glapi_Dispatch = dispatch;
+#else /*THREADS*/
+ _glapi_Dispatch = dispatch;
+#endif /*THREADS*/
+}
+
+
+
+/**
+ * Return pointer to current dispatch table for calling thread.
+ */
+struct _glapi_table *
+_glapi_get_dispatch(void)
+{
+ struct _glapi_table * api;
+#if defined(GLX_USE_TLS)
+ api = _glapi_tls_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
+
+
+/* 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;
+}
+
+
+
+/**********************************************************************
+ * 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;
+};
+
+static struct _glapi_function ExtEntryTable[MAX_EXTENSION_FUNCS];
+static GLuint NumExtEntryPoints = 0;
+
+/**
+ * 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) {
+ entry = &ExtEntryTable[NumExtEntryPoints];
+
+ ExtEntryTable[NumExtEntryPoints].name = strdup(funcName);
+ ExtEntryTable[NumExtEntryPoints].parameter_signature = NULL;
+ ExtEntryTable[NumExtEntryPoints].dispatch_offset = ~0;
+ 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][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)
+ return -1;
+ }
+
+ entry[i]->parameter_signature = strdup(real_sig);
+ entry[i]->dispatch_offset = offset;
+ }
+ }
+
+ return offset;
+}
+
+/*
+ * glXGetProcAddress doesn't exist in the protocol, the drivers never call
+ * this themselves, and neither does the server. warn if it happens though.
+ */
+_GLAPI_EXPORT _glapi_proc
+_glapi_get_proc_address(const char *funcName)
+{
+ ErrorF("_glapi_get_proc_address called!\n");
+ return NULL;
+}
+
+/**
+ * Return size of dispatch table struct as number of functions (or
+ * slots).
+ */
+GLuint
+_glapi_get_dispatch_table_size(void)
+{
+ return DISPATCH_TABLE_SIZE;
+}
+
+#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) */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-02 10:57:37 +0000