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Diffstat (limited to 'xorg-server/glx/remap.c')
| -rw-r--r-- | xorg-server/glx/remap.c | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/xorg-server/glx/remap.c b/xorg-server/glx/remap.c new file mode 100644 index 000000000..75c9320b8 --- /dev/null +++ b/xorg-server/glx/remap.c @@ -0,0 +1,231 @@ +/* + * 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 + * THE AUTHORS OR COPYRIGHT HOLDERS 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. + */ + +#ifdef HAVE_DIX_CONFIG_H +#include <dix-config.h> +#endif + +#include "glheader.h" + +#include "glapi.h" +#include "glapitable.h" + +#include "remap.h" + +#define MAX_ENTRY_POINTS 16 + +#define need_MESA_remap_table +#include "remap_helper.h" + + +/* this is global for quick access */ +SERVEXTERN int driDispatchRemapTable[driDispatchRemapTable_size]; + +#if 0 +/** + * 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 < Elements(_mesa_function_pool)) + return _mesa_function_pool + func_index; + else + return NULL; +} +#endif + +/** + * 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); +} + +#if 0 +/** + * 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); +} +#else +#define ASSERT(a) +#define _mesa_warning(a, ...) ErrorF(__VA_ARGS__) +#endif + +/** + * 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 main/dispatch.h. + */ +static void +_mesa_do_init_remap_table(const char *pool, + int size, + const struct gl_function_pool_remap *remap) +{ + static GLboolean initialized = GL_FALSE; + GLint i; + + if (initialized) + return; + initialized = GL_TRUE; + + /* initialize the remap table */ + for (i = 0; i < size; i++) { + GLint offset; + const char *spec; + + /* sanity check */ + ASSERT(i == remap[i].remap_index); + spec = _mesa_function_pool + remap[i].pool_index; + + offset = _mesa_map_function_spec(spec); + /* store the dispatch offset in the remap table */ + driDispatchRemapTable[i] = offset; + if (offset < 0) { + const char *name = spec + strlen(spec) + 1; + _mesa_warning(NULL, "failed to remap %s", name); + } + } +} + + +void +_mesa_init_remap_table(void) +{ + _mesa_do_init_remap_table(_mesa_function_pool, + driDispatchRemapTable_size, + MESA_remap_table_functions); +} |