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-rw-r--r--nx-X11/extras/Mesa/src/mesa/main/hash.c451
1 files changed, 0 insertions, 451 deletions
diff --git a/nx-X11/extras/Mesa/src/mesa/main/hash.c b/nx-X11/extras/Mesa/src/mesa/main/hash.c
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@@ -1,451 +0,0 @@
-/**
- * \file hash.c
- * Generic hash table.
- *
- * Used for display lists, texture objects, vertex/fragment programs,
- * buffer objects, etc. The hash functions are thread-safe.
- *
- * \note key=0 is illegal.
- *
- * \author Brian Paul
- */
-
-/*
- * Mesa 3-D graphics library
- * Version: 6.4
- *
- * Copyright (C) 1999-2005 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.
- */
-
-
-#include "glheader.h"
-#include "imports.h"
-#include "glthread.h"
-#include "hash.h"
-
-
-#define TABLE_SIZE 1023 /**< Size of lookup table/array */
-
-#define HASH_FUNC(K) ((K) % TABLE_SIZE)
-
-
-/**
- * An entry in the hash table.
- *
- * This struct is private to this file.
- */
-struct HashEntry {
- GLuint Key; /**< the entry's key */
- void *Data; /**< the entry's data */
- struct HashEntry *Next; /**< pointer to next entry */
-};
-
-/**
- * The hash table data structure.
- *
- * This is an opaque types (it's not defined in hash.h file).
- */
-struct _mesa_HashTable {
- struct HashEntry *Table[TABLE_SIZE]; /**< the lookup table */
- GLuint MaxKey; /**< highest key inserted so far */
- _glthread_Mutex Mutex; /**< mutual exclusion lock */
-};
-
-
-/**
- * Create a new hash table.
- *
- * \return pointer to a new, empty hash table.
- */
-struct _mesa_HashTable *
-_mesa_NewHashTable(void)
-{
- struct _mesa_HashTable *table = CALLOC_STRUCT(_mesa_HashTable);
- if (table) {
- _glthread_INIT_MUTEX(table->Mutex);
- }
- return table;
-}
-
-
-
-/**
- * Delete a hash table.
- * Frees each entry on the hash table and then the hash table structure itself.
- * Note that the caller should have already traversed the table and deleted
- * the objects in the table (i.e. We don't free the entries' data pointer).
- *
- * \param table the hash table to delete.
- */
-void
-_mesa_DeleteHashTable(struct _mesa_HashTable *table)
-{
- GLuint i;
- assert(table);
- for (i = 0; i < TABLE_SIZE; i++) {
- struct HashEntry *entry = table->Table[i];
- while (entry) {
- struct HashEntry *next = entry->Next;
- FREE(entry);
- entry = next;
- }
- }
- _glthread_DESTROY_MUTEX(table->Mutex);
- FREE(table);
-}
-
-
-
-/**
- * Lookup an entry in the hash table.
- *
- * \param table the hash table.
- * \param key the key.
- *
- * \return pointer to user's data or NULL if key not in table
- */
-void *
-_mesa_HashLookup(const struct _mesa_HashTable *table, GLuint key)
-{
- GLuint pos;
- const struct HashEntry *entry;
-
- assert(table);
- assert(key);
-
- pos = HASH_FUNC(key);
- entry = table->Table[pos];
- while (entry) {
- if (entry->Key == key) {
- return entry->Data;
- }
- entry = entry->Next;
- }
- return NULL;
-}
-
-
-
-/**
- * Insert a key/pointer pair into the hash table.
- * If an entry with this key already exists we'll replace the existing entry.
- *
- * \param table the hash table.
- * \param key the key (not zero).
- * \param data pointer to user data.
- */
-void
-_mesa_HashInsert(struct _mesa_HashTable *table, GLuint key, void *data)
-{
- /* search for existing entry with this key */
- GLuint pos;
- struct HashEntry *entry;
-
- assert(table);
- assert(key);
-
- _glthread_LOCK_MUTEX(table->Mutex);
-
- if (key > table->MaxKey)
- table->MaxKey = key;
-
- pos = HASH_FUNC(key);
- entry = table->Table[pos];
- while (entry) {
- if (entry->Key == key) {
- /* replace entry's data */
- entry->Data = data;
- _glthread_UNLOCK_MUTEX(table->Mutex);
- return;
- }
- entry = entry->Next;
- }
-
- /* alloc and insert new table entry */
- entry = MALLOC_STRUCT(HashEntry);
- entry->Key = key;
- entry->Data = data;
- entry->Next = table->Table[pos];
- table->Table[pos] = entry;
-
- _glthread_UNLOCK_MUTEX(table->Mutex);
-}
-
-
-
-/**
- * Remove an entry from the hash table.
- *
- * \param table the hash table.
- * \param key key of entry to remove.
- *
- * While holding the hash table's lock, searches the entry with the matching
- * key and unlinks it.
- */
-void
-_mesa_HashRemove(struct _mesa_HashTable *table, GLuint key)
-{
- GLuint pos;
- struct HashEntry *entry, *prev;
-
- assert(table);
- assert(key);
-
- _glthread_LOCK_MUTEX(table->Mutex);
-
- pos = HASH_FUNC(key);
- prev = NULL;
- entry = table->Table[pos];
- while (entry) {
- if (entry->Key == key) {
- /* found it! */
- if (prev) {
- prev->Next = entry->Next;
- }
- else {
- table->Table[pos] = entry->Next;
- }
- FREE(entry);
- _glthread_UNLOCK_MUTEX(table->Mutex);
- return;
- }
- prev = entry;
- entry = entry->Next;
- }
-
- _glthread_UNLOCK_MUTEX(table->Mutex);
-}
-
-
-
-/**
- * Get the key of the "first" entry in the hash table.
- *
- * This is used in the course of deleting all display lists when
- * a context is destroyed.
- *
- * \param table the hash table
- *
- * \return key for the "first" entry in the hash table.
- *
- * While holding the lock, walks through all table positions until finding
- * the first entry of the first non-empty one.
- */
-GLuint
-_mesa_HashFirstEntry(struct _mesa_HashTable *table)
-{
- GLuint pos;
- assert(table);
- _glthread_LOCK_MUTEX(table->Mutex);
- for (pos=0; pos < TABLE_SIZE; pos++) {
- if (table->Table[pos]) {
- _glthread_UNLOCK_MUTEX(table->Mutex);
- return table->Table[pos]->Key;
- }
- }
- _glthread_UNLOCK_MUTEX(table->Mutex);
- return 0;
-}
-
-
-/**
- * Given a hash table key, return the next key. This is used to walk
- * over all entries in the table. Note that the keys returned during
- * walking won't be in any particular order.
- * \return next hash key or 0 if end of table.
- */
-GLuint
-_mesa_HashNextEntry(const struct _mesa_HashTable *table, GLuint key)
-{
- const struct HashEntry *entry;
- GLuint pos;
-
- assert(table);
- assert(key);
-
- /* Find the entry with given key */
- pos = HASH_FUNC(key);
- entry = table->Table[pos];
- while (entry) {
- if (entry->Key == key) {
- break;
- }
- entry = entry->Next;
- }
-
- if (!entry) {
- /* the key was not found, we can't find next entry */
- return 0;
- }
-
- if (entry->Next) {
- /* return next in linked list */
- return entry->Next->Key;
- }
- else {
- /* look for next non-empty table slot */
- pos++;
- while (pos < TABLE_SIZE) {
- if (table->Table[pos]) {
- return table->Table[pos]->Key;
- }
- pos++;
- }
- return 0;
- }
-}
-
-
-/**
- * Dump contents of hash table for debugging.
- *
- * \param table the hash table.
- */
-void
-_mesa_HashPrint(const struct _mesa_HashTable *table)
-{
- GLuint i;
- assert(table);
- for (i=0;i<TABLE_SIZE;i++) {
- const struct HashEntry *entry = table->Table[i];
- while (entry) {
- _mesa_debug(NULL, "%u %p\n", entry->Key, entry->Data);
- entry = entry->Next;
- }
- }
-}
-
-
-
-/**
- * Find a block of adjacent unused hash keys.
- *
- * \param table the hash table.
- * \param numKeys number of keys needed.
- *
- * \return Starting key of free block or 0 if failure.
- *
- * If there are enough free keys between the maximum key existing in the table
- * (_mesa_HashTable::MaxKey) and the maximum key possible, then simply return
- * the adjacent key. Otherwise do a full search for a free key block in the
- * allowable key range.
- */
-GLuint
-_mesa_HashFindFreeKeyBlock(struct _mesa_HashTable *table, GLuint numKeys)
-{
- GLuint maxKey = ~((GLuint) 0);
- _glthread_LOCK_MUTEX(table->Mutex);
- if (maxKey - numKeys > table->MaxKey) {
- /* the quick solution */
- _glthread_UNLOCK_MUTEX(table->Mutex);
- return table->MaxKey + 1;
- }
- else {
- /* the slow solution */
- GLuint freeCount = 0;
- GLuint freeStart = 1;
- GLuint key;
- for (key=1; key!=maxKey; key++) {
- if (_mesa_HashLookup(table, key)) {
- /* darn, this key is already in use */
- freeCount = 0;
- freeStart = key+1;
- }
- else {
- /* this key not in use, check if we've found enough */
- freeCount++;
- if (freeCount == numKeys) {
- _glthread_UNLOCK_MUTEX(table->Mutex);
- return freeStart;
- }
- }
- }
- /* cannot allocate a block of numKeys consecutive keys */
- _glthread_UNLOCK_MUTEX(table->Mutex);
- return 0;
- }
-}
-
-
-#if 0 /* debug only */
-
-/**
- * Test walking over all the entries in a hash table.
- */
-static void
-test_hash_walking(void)
-{
- struct _mesa_HashTable *t = _mesa_NewHashTable();
- const GLuint limit = 50000;
- GLuint i;
-
- /* create some entries */
- for (i = 0; i < limit; i++) {
- GLuint dummy;
- GLuint k = (rand() % (limit * 10)) + 1;
- while (_mesa_HashLookup(t, k)) {
- /* id already in use, try another */
- k = (rand() % (limit * 10)) + 1;
- }
- _mesa_HashInsert(t, k, &dummy);
- }
-
- /* walk over all entries */
- {
- GLuint k = _mesa_HashFirstEntry(t);
- GLuint count = 0;
- while (k) {
- GLuint knext = _mesa_HashNextEntry(t, k);
- assert(knext != k);
- _mesa_HashRemove(t, k);
- count++;
- k = knext;
- }
- assert(count == limit);
- k = _mesa_HashFirstEntry(t);
- assert(k==0);
- }
-
- _mesa_DeleteHashTable(t);
-}
-
-
-void
-_mesa_test_hash_functions(void)
-{
- int a, b, c;
- struct _mesa_HashTable *t;
-
- t = _mesa_NewHashTable();
- _mesa_HashInsert(t, 501, &a);
- _mesa_HashInsert(t, 10, &c);
- _mesa_HashInsert(t, 0xfffffff8, &b);
- /*_mesa_HashPrint(t);*/
-
- assert(_mesa_HashLookup(t,501));
- assert(!_mesa_HashLookup(t,1313));
- assert(_mesa_HashFindFreeKeyBlock(t, 100));
-
- _mesa_DeleteHashTable(t);
-
- test_hash_walking();
-}
-
-#endif
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