1/* 2 * Mesa 3-D graphics library 3 * 4 * Copyright (C) 2010 LunarG Inc. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included 14 * in all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 22 * DEALINGS IN THE SOFTWARE. 23 * 24 * Authors: 25 * Chia-I Wu <olv@lunarg.com> 26 */ 27 28#include <stdlib.h> 29#include <string.h> 30 31#include "u_current.h" 32#include "mapi.h" 33#include "stub.h" 34#include "table.h" 35 36/* dynamic stubs will run out before this array */ 37static const struct mapi_stub *mapi_stub_map[MAPI_TABLE_NUM_SLOTS]; 38static int mapi_num_stubs; 39 40static const struct mapi_stub * 41get_stub(const char *name, const struct mapi_stub *alias) 42{ 43 const struct mapi_stub *stub; 44 45 stub = stub_find_public(name); 46 if (!stub) { 47 struct mapi_stub *dyn = stub_find_dynamic(name, 1); 48 if (dyn) { 49 stub_fix_dynamic(dyn, alias); 50 stub = dyn; 51 } 52 } 53 54 return stub; 55} 56 57/** 58 * Initialize mapi. spec consists of NULL-separated strings. The first string 59 * denotes the version. It is followed by variable numbers of entries. Each 60 * entry can have multiple names. An empty name terminates an entry. An empty 61 * entry terminates the spec. A spec of two entries, Foo and Bar, is as 62 * follows 63 * 64 * "1\0" 65 * "Foo\0" 66 * "FooEXT\0" 67 * "\0" 68 * "Bar\0" 69 * "\0" 70 */ 71void 72mapi_init(const char *spec) 73{ 74 static mtx_t mutex = _MTX_INITIALIZER_NP; 75 const char *p; 76 int ver, count; 77 78 mtx_lock(&mutex); 79 80 /* already initialized */ 81 if (mapi_num_stubs) { 82 mtx_unlock(&mutex); 83 return; 84 } 85 86 count = 0; 87 p = spec; 88 89 /* parse version string */ 90 ver = atoi(p); 91 if (ver != 1) { 92 mtx_unlock(&mutex); 93 return; 94 } 95 p += strlen(p) + 1; 96 97 while (*p) { 98 const struct mapi_stub *stub; 99 100 stub = get_stub(p, NULL); 101 /* out of dynamic entries */ 102 if (!stub) 103 break; 104 p += strlen(p) + 1; 105 106 while (*p) { 107 get_stub(p, stub); 108 p += strlen(p) + 1; 109 } 110 111 mapi_stub_map[count++] = stub; 112 p++; 113 } 114 115 mapi_num_stubs = count; 116 117 mtx_unlock(&mutex); 118} 119 120/** 121 * Return the address of an entry. Optionally generate the entry if it does 122 * not exist. 123 */ 124mapi_proc 125mapi_get_proc_address(const char *name) 126{ 127 const struct mapi_stub *stub; 128 129 stub = stub_find_public(name); 130 if (!stub) 131 stub = stub_find_dynamic(name, 0); 132 133 return (stub) ? (mapi_proc) stub_get_addr(stub) : NULL; 134} 135 136/** 137 * Create a dispatch table. 138 */ 139struct mapi_table * 140mapi_table_create(void) 141{ 142 const struct mapi_table *noop = table_get_noop(); 143 struct mapi_table *tbl; 144 145 tbl = malloc(MAPI_TABLE_SIZE); 146 if (tbl) 147 memcpy(tbl, noop, MAPI_TABLE_SIZE); 148 149 return tbl; 150} 151 152/** 153 * Destroy a dispatch table. 154 */ 155void 156mapi_table_destroy(struct mapi_table *tbl) 157{ 158 free(tbl); 159} 160 161/** 162 * Fill a dispatch table. The order of the procs is determined when mapi_init 163 * is called. 164 */ 165void 166mapi_table_fill(struct mapi_table *tbl, const mapi_proc *procs) 167{ 168 const struct mapi_table *noop = table_get_noop(); 169 int i; 170 171 for (i = 0; i < mapi_num_stubs; i++) { 172 const struct mapi_stub *stub = mapi_stub_map[i]; 173 int slot = stub_get_slot(stub); 174 mapi_func func = (mapi_func) procs[i]; 175 176 if (!func) 177 func = table_get_func(noop, slot); 178 table_set_func(tbl, slot, func); 179 } 180} 181 182/** 183 * Make a dispatch table current. 184 */ 185void 186mapi_table_make_current(const struct mapi_table *tbl) 187{ 188 u_current_set_table(tbl); 189} 190