646 lines
18 KiB
C
646 lines
18 KiB
C
/*
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* Mesa 3-D graphics library
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* Version: 7.1
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*
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* Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/**
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* \file glapi_getproc.c
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*
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* Code for implementing glXGetProcAddress(), etc.
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* This was originally in glapi.c but refactored out.
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*/
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#ifdef HAVE_DIX_CONFIG_H
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#include <dix-config.h>
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#include "glapi/mesa.h"
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#else
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#include "main/glheader.h"
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#include "main/compiler.h"
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#endif
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#include "glapi/glapi.h"
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#include "glapi/glapi_priv.h"
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#include "glapi/glapitable.h"
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#include "glapi/glapioffsets.h"
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/**********************************************************************
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* Static function management.
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*/
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#if !defined(DISPATCH_FUNCTION_SIZE) && !defined(XFree86Server)
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# define NEED_FUNCTION_POINTER
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#endif
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#include "glapi/glprocs.h"
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/**
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* Search the table of static entrypoint functions for the named function
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* and return the corresponding glprocs_table_t entry.
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*/
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static const glprocs_table_t *
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get_static_proc( const char * n )
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{
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GLuint i;
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for (i = 0; static_functions[i].Name_offset >= 0; i++) {
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const char *testName = gl_string_table + static_functions[i].Name_offset;
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#ifdef MANGLE
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/* skip the prefix on the name */
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if (strcmp(testName, n + 1) == 0)
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#else
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if (strcmp(testName, n) == 0)
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#endif
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{
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return &static_functions[i];
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}
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}
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return NULL;
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}
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/**
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* Return dispatch table offset of the named static (built-in) function.
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* Return -1 if function not found.
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*/
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static GLint
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get_static_proc_offset(const char *funcName)
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{
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const glprocs_table_t * const f = get_static_proc( funcName );
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if (f == NULL) {
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return -1;
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}
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return f->Offset;
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}
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#if !defined(XFree86Server)
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/**
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* Return dispatch function address for the named static (built-in) function.
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* Return NULL if function not found.
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*/
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static _glapi_proc
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get_static_proc_address(const char *funcName)
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{
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const glprocs_table_t * const f = get_static_proc( funcName );
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if (f == NULL) {
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return NULL;
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}
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#if defined(DISPATCH_FUNCTION_SIZE) && defined(GLX_INDIRECT_RENDERING)
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return (f->Address == NULL)
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? get_entrypoint_address(f->Offset)
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: f->Address;
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#elif defined(DISPATCH_FUNCTION_SIZE)
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return get_entrypoint_address(f->Offset);
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#else
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return f->Address;
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#endif
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}
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#else
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static _glapi_proc
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get_static_proc_address(const char *funcName)
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{
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(void) funcName;
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return NULL;
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}
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#endif /* !defined(XFree86Server) */
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/**
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* Return the name of the function at the given offset in the dispatch
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* table. For debugging only.
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*/
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static const char *
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get_static_proc_name( GLuint offset )
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{
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GLuint i;
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for (i = 0; static_functions[i].Name_offset >= 0; i++) {
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if (static_functions[i].Offset == offset) {
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return gl_string_table + static_functions[i].Name_offset;
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}
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}
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return NULL;
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}
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/**********************************************************************
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* Extension function management.
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*/
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/**
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* Track information about a function added to the GL API.
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*/
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struct _glapi_function {
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/**
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* Name of the function.
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*/
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const char * name;
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/**
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* Text string that describes the types of the parameters passed to the
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* named function. Parameter types are converted to characters using the
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* following rules:
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* - 'i' for \c GLint, \c GLuint, and \c GLenum
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* - 'p' for any pointer type
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* - 'f' for \c GLfloat and \c GLclampf
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* - 'd' for \c GLdouble and \c GLclampd
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*/
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const char * parameter_signature;
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/**
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* Offset in the dispatch table where the pointer to the real function is
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* located. If the driver has not requested that the named function be
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* added to the dispatch table, this will have the value ~0.
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*/
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unsigned dispatch_offset;
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/**
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* Pointer to the dispatch stub for the named function.
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*
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* \todo
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* The semantic of this field should be changed slightly. Currently, it
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* is always expected to be non-\c NULL. However, it would be better to
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* only allocate the entry-point stub when the application requests the
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* function via \c glXGetProcAddress. This would save memory for all the
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* functions that the driver exports but that the application never wants
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* to call.
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*/
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_glapi_proc dispatch_stub;
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};
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/*
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* Number of extension functions which we can dynamically add at runtime.
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*/
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#define MAX_EXTENSION_FUNCS 300
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static struct _glapi_function ExtEntryTable[MAX_EXTENSION_FUNCS];
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static GLuint NumExtEntryPoints = 0;
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static struct _glapi_function *
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get_extension_proc(const char *funcName)
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{
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GLuint i;
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for (i = 0; i < NumExtEntryPoints; i++) {
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if (strcmp(ExtEntryTable[i].name, funcName) == 0) {
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return & ExtEntryTable[i];
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}
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}
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return NULL;
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}
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static GLint
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get_extension_proc_offset(const char *funcName)
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{
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const struct _glapi_function * const f = get_extension_proc( funcName );
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if (f == NULL) {
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return -1;
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}
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return f->dispatch_offset;
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}
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static _glapi_proc
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get_extension_proc_address(const char *funcName)
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{
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const struct _glapi_function * const f = get_extension_proc( funcName );
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if (f == NULL) {
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return NULL;
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}
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return f->dispatch_stub;
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}
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static const char *
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get_extension_proc_name(GLuint offset)
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{
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GLuint i;
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for (i = 0; i < NumExtEntryPoints; i++) {
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if (ExtEntryTable[i].dispatch_offset == offset) {
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return ExtEntryTable[i].name;
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}
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}
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return NULL;
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}
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/**
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* strdup() is actually not a standard ANSI C or POSIX routine.
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* Irix will not define it if ANSI mode is in effect.
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*/
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static char *
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str_dup(const char *str)
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{
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char *copy;
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copy = (char*) malloc(strlen(str) + 1);
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if (!copy)
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return NULL;
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strcpy(copy, str);
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return copy;
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}
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/**
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* Generate new entrypoint
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*
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* Use a temporary dispatch offset of ~0 (i.e. -1). Later, when the driver
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* calls \c _glapi_add_dispatch we'll put in the proper offset. If that
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* never happens, and the user calls this function, he'll segfault. That's
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* what you get when you try calling a GL function that doesn't really exist.
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*
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* \param funcName Name of the function to create an entry-point for.
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*
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* \sa _glapi_add_entrypoint
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*/
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static struct _glapi_function *
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add_function_name( const char * funcName )
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{
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struct _glapi_function * entry = NULL;
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if (NumExtEntryPoints < MAX_EXTENSION_FUNCS) {
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_glapi_proc entrypoint = generate_entrypoint(~0);
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if (entrypoint != NULL) {
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entry = & ExtEntryTable[NumExtEntryPoints];
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ExtEntryTable[NumExtEntryPoints].name = str_dup(funcName);
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ExtEntryTable[NumExtEntryPoints].parameter_signature = NULL;
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ExtEntryTable[NumExtEntryPoints].dispatch_offset = ~0;
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ExtEntryTable[NumExtEntryPoints].dispatch_stub = entrypoint;
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NumExtEntryPoints++;
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}
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}
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return entry;
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}
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/**
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* Fill-in the dispatch stub for the named function.
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*
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* This function is intended to be called by a hardware driver. When called,
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* a dispatch stub may be created created for the function. A pointer to this
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* dispatch function will be returned by glXGetProcAddress.
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*
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* \param function_names Array of pointers to function names that should
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* share a common dispatch offset.
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* \param parameter_signature String representing the types of the parameters
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* passed to the named function. Parameter types
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* are converted to characters using the following
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* rules:
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* - 'i' for \c GLint, \c GLuint, and \c GLenum
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* - 'p' for any pointer type
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* - 'f' for \c GLfloat and \c GLclampf
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* - 'd' for \c GLdouble and \c GLclampd
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*
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* \returns
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* The offset in the dispatch table of the named function. A pointer to the
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* driver's implementation of the named function should be stored at
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* \c dispatch_table[\c offset]. Return -1 if error/problem.
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*
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* \sa glXGetProcAddress
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*
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* \warning
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* This function can only handle up to 8 names at a time. As far as I know,
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* the maximum number of names ever associated with an existing GL function is
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* 4 (\c glPointParameterfSGIS, \c glPointParameterfEXT,
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* \c glPointParameterfARB, and \c glPointParameterf), so this should not be
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* too painful of a limitation.
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*
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* \todo
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* Determine whether or not \c parameter_signature should be allowed to be
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* \c NULL. It doesn't seem like much of a hardship for drivers to have to
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* pass in an empty string.
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*
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* \todo
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* Determine if code should be added to reject function names that start with
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* 'glX'.
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*
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* \bug
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* Add code to compare \c parameter_signature with the parameter signature of
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* a static function. In order to do that, we need to find a way to \b get
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* the parameter signature of a static function.
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*/
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PUBLIC int
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_glapi_add_dispatch( const char * const * function_names,
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const char * parameter_signature )
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{
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static int next_dynamic_offset = _gloffset_FIRST_DYNAMIC;
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const char * const real_sig = (parameter_signature != NULL)
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? parameter_signature : "";
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struct _glapi_function * entry[8];
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GLboolean is_static[8];
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unsigned i;
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unsigned j;
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int offset = ~0;
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int new_offset;
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(void) memset( is_static, 0, sizeof( is_static ) );
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(void) memset( entry, 0, sizeof( entry ) );
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for ( i = 0 ; function_names[i] != NULL ; i++ ) {
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/* Do some trivial validation on the name of the function.
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*/
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if (!function_names[i] || function_names[i][0] != 'g' || function_names[i][1] != 'l')
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return -1;
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/* Determine if the named function already exists. If the function does
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* exist, it must have the same parameter signature as the function
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* being added.
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*/
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new_offset = get_static_proc_offset(function_names[i]);
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if (new_offset >= 0) {
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/* FIXME: Make sure the parameter signatures match! How do we get
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* FIXME: the parameter signature for static functions?
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*/
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if ( (offset != ~0) && (new_offset != offset) ) {
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return -1;
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}
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is_static[i] = GL_TRUE;
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offset = new_offset;
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}
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for ( j = 0 ; j < NumExtEntryPoints ; j++ ) {
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if (strcmp(ExtEntryTable[j].name, function_names[i]) == 0) {
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/* The offset may be ~0 if the function name was added by
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* glXGetProcAddress but never filled in by the driver.
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*/
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if (ExtEntryTable[j].dispatch_offset != ~0) {
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if (strcmp(real_sig, ExtEntryTable[j].parameter_signature)
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!= 0) {
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return -1;
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}
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if ( (offset != ~0) && (ExtEntryTable[j].dispatch_offset != offset) ) {
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return -1;
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}
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offset = ExtEntryTable[j].dispatch_offset;
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}
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entry[i] = & ExtEntryTable[j];
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break;
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}
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}
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}
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if (offset == ~0) {
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offset = next_dynamic_offset;
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next_dynamic_offset++;
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}
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for ( i = 0 ; function_names[i] != NULL ; i++ ) {
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if (! is_static[i] ) {
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if (entry[i] == NULL) {
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entry[i] = add_function_name( function_names[i] );
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if (entry[i] == NULL) {
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/* FIXME: Possible memory leak here.
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*/
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return -1;
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}
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}
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entry[i]->parameter_signature = str_dup(real_sig);
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fill_in_entrypoint_offset(entry[i]->dispatch_stub, offset);
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entry[i]->dispatch_offset = offset;
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}
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}
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return offset;
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}
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/**
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* Return offset of entrypoint for named function within dispatch table.
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*/
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PUBLIC GLint
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_glapi_get_proc_offset(const char *funcName)
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{
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GLint offset;
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/* search extension functions first */
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offset = get_extension_proc_offset(funcName);
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if (offset >= 0)
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return offset;
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/* search static functions */
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return get_static_proc_offset(funcName);
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}
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/**
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* Return pointer to the named function. If the function name isn't found
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* in the name of static functions, try generating a new API entrypoint on
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* the fly with assembly language.
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*/
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PUBLIC _glapi_proc
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_glapi_get_proc_address(const char *funcName)
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{
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_glapi_proc func;
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struct _glapi_function * entry;
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#ifdef MANGLE
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/* skip the prefix on the name */
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if (funcName[1] != 'g' || funcName[2] != 'l')
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return NULL;
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#else
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if (funcName[0] != 'g' || funcName[1] != 'l')
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return NULL;
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#endif
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/* search extension functions first */
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func = get_extension_proc_address(funcName);
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if (func)
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return func;
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/* search static functions */
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func = get_static_proc_address(funcName);
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if (func)
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return func;
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entry = add_function_name(funcName);
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return (entry == NULL) ? NULL : entry->dispatch_stub;
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}
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/**
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* Return the name of the function at the given dispatch offset.
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* This is only intended for debugging.
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*/
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const char *
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_glapi_get_proc_name(GLuint offset)
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{
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const char * n;
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/* search built-in functions */
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n = get_static_proc_name(offset);
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if ( n != NULL ) {
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return n;
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}
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/* search added extension functions */
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return get_extension_proc_name(offset);
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}
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/**********************************************************************
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* GL API table functions.
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*/
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/*
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* The dispatch table size (number of entries) is the size of the
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* _glapi_table struct plus the number of dynamic entries we can add.
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* The extra slots can be filled in by DRI drivers that register new extension
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* functions.
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*/
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#define DISPATCH_TABLE_SIZE (sizeof(struct _glapi_table) / sizeof(void *) + MAX_EXTENSION_FUNCS)
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/**
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* Return size of dispatch table struct as number of functions (or
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* slots).
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*/
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PUBLIC GLuint
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_glapi_get_dispatch_table_size(void)
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{
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return DISPATCH_TABLE_SIZE;
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}
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/**
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* Make sure there are no NULL pointers in the given dispatch table.
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* Intended for debugging purposes.
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*/
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void
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_glapi_check_table_not_null(const struct _glapi_table *table)
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{
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#ifdef EXTRA_DEBUG /* set to DEBUG for extra DEBUG */
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const GLuint entries = _glapi_get_dispatch_table_size();
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const void **tab = (const void **) table;
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GLuint i;
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for (i = 1; i < entries; i++) {
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assert(tab[i]);
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}
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#else
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(void) table;
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#endif
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}
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|
|
|
|
|
/**
|
|
* Do some spot checks to be sure that the dispatch table
|
|
* slots are assigned correctly. For debugging only.
|
|
*/
|
|
void
|
|
_glapi_check_table(const struct _glapi_table *table)
|
|
{
|
|
#ifdef EXTRA_DEBUG /* set to DEBUG for extra DEBUG */
|
|
{
|
|
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
|
|
}
|