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+/*
+ * Mesa 3-D graphics library
+ * Version: 7.7
+ *
+ * Copyright (C) 2009 Chia-I Wu <olv@0xlab.org>
+ *
+ * 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.
+ */
+
+
+/**
+ * \file remap.c
+ * Remap table management.
+ *
+ * Entries in the dispatch table are either static or dynamic. The
+ * dispatch table is shared by mesa core and glapi. When they are
+ * built separately, it is possible that a static entry in mesa core
+ * is dynamic, or assigned a different static offset, in glapi. The
+ * remap table is in charge of mapping a static entry in mesa core to
+ * a dynamic entry, or the corresponding static entry, in glapi.
+ */
+
+#include "remap.h"
+#include "imports.h"
+
+#include "glapi/dispatch.h"
+
+
+#if FEATURE_remap_table
+
+
+#define need_MESA_remap_table
+#include "remap_helper.h"
+
+#define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
+#define MAX_ENTRY_POINTS 16
+
+
+/* this is global for quick access */
+int driDispatchRemapTable[driDispatchRemapTable_size];
+
+
+/**
+ * Return the spec string associated with the given function index.
+ * The index is available from including remap_helper.h.
+ *
+ * \param func_index an opaque function index.
+ *
+ * \return the spec string associated with the function index, or NULL.
+ */
+const char *
+_mesa_get_function_spec(GLint func_index)
+{
+ if (func_index < ARRAY_SIZE(_mesa_function_pool))
+ return _mesa_function_pool + func_index;
+ else
+ return NULL;
+}
+
+
+/**
+ * Map a function by its spec. The function will be added to glapi,
+ * and the dispatch offset will be returned.
+ *
+ * \param spec a '\0'-separated string array specifying a function.
+ * It begins with the parameter signature of the function,
+ * followed by the names of the entry points. An empty entry
+ * point name terminates the array.
+ *
+ * \return the offset of the (re-)mapped function in the dispatch
+ * table, or -1.
+ */
+GLint
+_mesa_map_function_spec(const char *spec)
+{
+ const char *signature;
+ const char *names[MAX_ENTRY_POINTS + 1];
+ GLint num_names = 0;
+
+ if (!spec)
+ return -1;
+
+ signature = spec;
+ spec += strlen(spec) + 1;
+
+ /* spec is terminated by an empty string */
+ while (*spec) {
+ names[num_names] = spec;
+ num_names++;
+ if (num_names >= MAX_ENTRY_POINTS)
+ break;
+ spec += strlen(spec) + 1;
+ }
+ if (!num_names)
+ return -1;
+
+ names[num_names] = NULL;
+
+ /* add the entry points to the dispatch table */
+ return _glapi_add_dispatch(names, signature);
+}
+
+
+/**
+ * Map an array of functions. This is a convenient function for
+ * use with arrays available from including remap_helper.h.
+ *
+ * Note that the dispatch offsets of the functions are not returned.
+ * If they are needed, _mesa_map_function_spec() should be used.
+ *
+ * \param func_array an array of function remaps.
+ */
+void
+_mesa_map_function_array(const struct gl_function_remap *func_array)
+{
+ GLint i;
+
+ if (!func_array)
+ return;
+
+ for (i = 0; func_array[i].func_index != -1; i++) {
+ const char *spec;
+ GLint offset;
+
+ spec = _mesa_get_function_spec(func_array[i].func_index);
+ if (!spec) {
+ _mesa_problem(NULL, "invalid function index %d",
+ func_array[i].func_index);
+ continue;
+ }
+
+ offset = _mesa_map_function_spec(spec);
+ /* error checks */
+ if (offset < 0) {
+ const char *name = spec + strlen(spec) + 1;
+ _mesa_warning(NULL, "failed to remap %s", name);
+ }
+ else if (func_array[i].dispatch_offset >= 0 &&
+ offset != func_array[i].dispatch_offset) {
+ const char *name = spec + strlen(spec) + 1;
+ _mesa_problem(NULL, "%s should be mapped to %d, not %d",
+ name, func_array[i].dispatch_offset, offset);
+ }
+ }
+}
+
+
+/**
+ * Map the functions which are already static.
+ *
+ * When a extension function are incorporated into the ABI, the
+ * extension suffix is usually stripped. Mapping such functions
+ * makes sure the alternative names are available.
+ *
+ * Note that functions mapped by _mesa_init_remap_table() are
+ * excluded.
+ */
+void
+_mesa_map_static_functions(void)
+{
+ /* Remap static functions which have alternative names and are in the ABI.
+ * This is to be on the safe side. glapi should have defined those names.
+ */
+ _mesa_map_function_array(MESA_alt_functions);
+}
+
+
+/**
+ * Initialize the remap table. This is called in one_time_init().
+ * The remap table needs to be initialized before calling the
+ * CALL/GET/SET macros defined in glapi/dispatch.h.
+ */
+void
+_mesa_init_remap_table(void)
+{
+ static GLboolean initialized = GL_FALSE;
+ GLint i;
+
+ if (initialized)
+ return;
+ initialized = GL_TRUE;
+
+ /* initialize the remap table */
+ for (i = 0; i < ARRAY_SIZE(driDispatchRemapTable); i++) {
+ GLint offset;
+ const char *spec;
+
+ /* sanity check */
+ ASSERT(i == MESA_remap_table_functions[i].remap_index);
+ spec = _mesa_function_pool + MESA_remap_table_functions[i].pool_index;
+
+ offset = _mesa_map_function_spec(spec);
+ /* store the dispatch offset in the remap table */
+ driDispatchRemapTable[i] = offset;
+ if (offset < 0)
+ _mesa_warning(NULL, "failed to remap index %d", i);
+ }
+}
+
+
+#endif /* FEATURE_remap_table */