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363 lines
10 KiB
C
363 lines
10 KiB
C
/* SSNES - A Super Nintendo Entertainment System (SNES) Emulator frontend for libsnes.
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* Copyright (C) 2010-2011 - Hans-Kristian Arntzen
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*
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* Some code herein may be based on code found in BSNES.
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*
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* SSNES is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* SSNES is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with SSNES.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "dynamic.h"
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#include "general.h"
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#include "strl.h"
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#include <string.h>
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#include <assert.h>
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdbool.h>
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#include "libsnes.hpp"
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#ifdef NEED_DYNAMIC
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#ifdef _WIN32
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#include <windows.h>
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#else
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#include <dlfcn.h>
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#endif
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#endif
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#ifdef NEED_DYNAMIC
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#define DLSYM(lib, x) dylib_proc(lib, #x)
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#define SYM(type, x) do { \
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p##x = (type)DLSYM(lib_handle, x); \
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if (p##x == NULL) { SSNES_ERR("Failed to load symbol: \"%s\"\n", #x); exit(1); } \
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} while (0)
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#define OPT_SYM(type, x) do { \
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p##x = (type)DLSYM(lib_handle, x); \
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} while (0)
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static dylib_t lib_handle = NULL;
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#endif
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void (*psnes_init)(void);
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void (*psnes_set_video_refresh)(snes_video_refresh_t);
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void (*psnes_set_audio_sample)(snes_audio_sample_t);
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void (*psnes_set_input_poll)(snes_input_poll_t);
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void (*psnes_set_input_state)(snes_input_state_t);
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void (*psnes_reset)(void);
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void (*psnes_run)(void);
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void (*psnes_cheat_reset)(void);
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void (*psnes_cheat_set)(unsigned, bool, const char*);
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const char *(*psnes_library_id)(void) = NULL;
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unsigned (*psnes_library_revision_minor)(void);
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unsigned (*psnes_library_revision_major)(void);
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bool (*psnes_load_cartridge_normal)(const char*, const uint8_t*, unsigned);
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bool (*psnes_load_cartridge_super_game_boy)(
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const char*, const uint8_t*, unsigned,
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const char*, const uint8_t*, unsigned);
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bool (*psnes_load_cartridge_bsx)(
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const char*, const uint8_t*, unsigned,
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const char*, const uint8_t*, unsigned);
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bool (*psnes_load_cartridge_bsx_slotted)(
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const char*, const uint8_t*, unsigned,
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const char*, const uint8_t*, unsigned);
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bool (*psnes_load_cartridge_sufami_turbo)(
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const char*, const uint8_t*, unsigned,
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const char*, const uint8_t*, unsigned,
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const char*, const uint8_t*, unsigned);
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void (*psnes_set_controller_port_device)(bool, unsigned);
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bool (*psnes_get_region)(void);
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unsigned (*psnes_serialize_size)(void);
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bool (*psnes_serialize)(uint8_t*, unsigned);
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bool (*psnes_unserialize)(const uint8_t*, unsigned);
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void (*psnes_set_cartridge_basename)(const char*);
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uint8_t* (*psnes_get_memory_data)(unsigned);
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unsigned (*psnes_get_memory_size)(unsigned);
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void (*psnes_unload_cartridge)(void);
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void (*psnes_term)(void);
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#ifdef NEED_DYNAMIC
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static void set_environment(void);
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#endif
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#ifdef HAVE_DYNAMIC_LOAD
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static void load_dynamic(void)
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{
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SSNES_LOG("Loading dynamic libsnes from: \"%s\"\n", g_settings.libsnes);
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lib_handle = dylib_load(g_settings.libsnes);
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if (!lib_handle)
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{
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SSNES_ERR("Failed to open dynamic library: \"%s\"\n", g_settings.libsnes);
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exit(1);
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}
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SYM(void (*)(void), snes_init);
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SYM(void (*)(snes_video_refresh_t), snes_set_video_refresh);
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SYM(void (*)(snes_audio_sample_t), snes_set_audio_sample);
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SYM(void (*)(snes_input_poll_t), snes_set_input_poll);
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SYM(void (*)(snes_input_state_t), snes_set_input_state);
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SYM(const char *(*)(void), snes_library_id);
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SYM(unsigned (*)(void), snes_library_revision_minor);
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SYM(unsigned (*)(void), snes_library_revision_major);
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SYM(void (*)(void), snes_cheat_reset);
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SYM(void (*)(unsigned, bool, const char*), snes_cheat_set);
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SYM(void (*)(void), snes_reset);
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SYM(void (*)(void), snes_run);
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SYM(bool (*)(void), snes_get_region);
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SYM(bool (*)(const char*, const uint8_t*, unsigned), snes_load_cartridge_normal);
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SYM(bool (*)(const char*, const uint8_t*, unsigned,
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const char*, const uint8_t*, unsigned), snes_load_cartridge_super_game_boy);
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SYM(bool (*)(const char*, const uint8_t*, unsigned,
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const char*, const uint8_t*, unsigned), snes_load_cartridge_bsx);
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SYM(bool (*)(const char*, const uint8_t*, unsigned,
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const char*, const uint8_t*, unsigned), snes_load_cartridge_bsx_slotted);
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SYM(bool (*)(const char*, const uint8_t*, unsigned,
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const char*, const uint8_t*, unsigned,
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const char*, const uint8_t*, unsigned), snes_load_cartridge_sufami_turbo);
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SYM(void (*)(bool, unsigned), snes_set_controller_port_device);
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SYM(unsigned (*)(void), snes_serialize_size);
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SYM(bool (*)(uint8_t*, unsigned), snes_serialize);
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SYM(bool (*)(const uint8_t*, unsigned), snes_unserialize);
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SYM(void (*)(const char*), snes_set_cartridge_basename);
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SYM(uint8_t *(*)(unsigned), snes_get_memory_data);
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SYM(unsigned (*)(unsigned), snes_get_memory_size);
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SYM(void (*)(void), snes_unload_cartridge);
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SYM(void (*)(void), snes_term);
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}
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#else
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#define SSYM(x) do { \
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p##x = x; \
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} while (0)
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static void set_statics(void)
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{
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SSYM(snes_init);
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SSYM(snes_set_video_refresh);
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SSYM(snes_set_audio_sample);
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SSYM(snes_set_input_poll);
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SSYM(snes_set_input_state);
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SSYM(snes_library_revision_minor);
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SSYM(snes_library_revision_major);
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SSYM(snes_library_id);
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SSYM(snes_cheat_reset);
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SSYM(snes_cheat_set);
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SSYM(snes_reset);
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SSYM(snes_run);
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SSYM(snes_get_region);
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SSYM(snes_load_cartridge_normal);
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SSYM(snes_load_cartridge_super_game_boy);
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SSYM(snes_load_cartridge_bsx);
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SSYM(snes_load_cartridge_bsx_slotted);
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SSYM(snes_load_cartridge_sufami_turbo);
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SSYM(snes_set_controller_port_device);
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SSYM(snes_serialize_size);
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SSYM(snes_serialize);
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SSYM(snes_unserialize);
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SSYM(snes_set_cartridge_basename);
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SSYM(snes_get_memory_data);
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SSYM(snes_get_memory_size);
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SSYM(snes_unload_cartridge);
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SSYM(snes_term);
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}
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#endif
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void init_libsnes_sym(void)
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{
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// Guarantee that we can do "dirty" casting.
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// Every OS that this program supports should pass this ...
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assert(sizeof(void*) == sizeof(void (*)(void)));
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#ifdef HAVE_DYNAMIC
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// Try to verify that -lsnes was not linked in from other modules
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// since loading it dynamically and with -l will fail hard.
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function_t sym = dylib_proc(NULL, "snes_init");
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if (sym)
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{
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SSNES_ERR("Serious problem! SSNES wants to load libsnes dyamically, but it is already linked!\n");
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SSNES_ERR("This could happen if other modules SSNES depends on link against libsnes directly.\n");
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SSNES_ERR("Proceeding could cause a crash! Aborting ...\n");
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exit(1);
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}
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if (!*g_settings.libsnes)
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{
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#if defined(_WIN32)
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strlcpy(g_settings.libsnes, "snes.dll", sizeof(g_settings.libsnes));
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#elif defined(__APPLE__)
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strlcpy(g_settings.libsnes, "libsnes.dylib", sizeof(g_settings.libsnes));
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#else
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strlcpy(g_settings.libsnes, "libsnes.so", sizeof(g_settings.libsnes));
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#endif
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}
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load_dynamic();
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#else
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set_statics();
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#endif
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#ifdef NEED_DYNAMIC
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set_environment();
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#endif
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}
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void uninit_libsnes_sym(void)
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{
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#ifdef HAVE_DYNAMIC_LOAD
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if (lib_handle)
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dylib_close(lib_handle);
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#endif
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}
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#ifdef NEED_DYNAMIC
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// Platform independent dylib loading.
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dylib_t dylib_load(const char *path)
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{
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#ifdef _WIN32
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return LoadLibrary(path);
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#else
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return dlopen(path, RTLD_LAZY);
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#endif
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}
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#endif
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#ifdef HAVE_DYNAMIC_LOAD
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function_t dylib_proc(dylib_t lib, const char *proc)
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{
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#ifdef _WIN32
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function_t sym = (function_t)GetProcAddress(lib ? lib : GetModuleHandle(NULL), proc);
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#else
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void *ptr_sym = NULL;
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if (lib)
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ptr_sym = dlsym(lib, proc);
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else
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{
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void *handle = dlopen(NULL, RTLD_LAZY);
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if (handle)
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{
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ptr_sym = dlsym(handle, proc);
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dlclose(handle);
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}
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}
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// Dirty hack to workaround the non-legality of (void*) -> fn-pointer casts.
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function_t sym;
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memcpy(&sym, &ptr_sym, sizeof(void*));
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#endif
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return sym;
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}
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#endif
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#ifdef HAVE_DYNAMIC_LOAD
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void dylib_close(dylib_t lib)
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{
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#ifdef _WIN32
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FreeLibrary(lib);
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#else
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dlclose(lib);
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#endif
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}
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#endif
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#ifdef HAVE_DYNAMIC_LOAD
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static bool environment_cb(unsigned cmd, void *data)
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{
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switch (cmd)
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{
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case SNES_ENVIRONMENT_GET_FULLPATH:
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*(const char**)data = g_extern.system.fullpath;
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SSNES_LOG("FULLPATH: \"%s\"\n", g_extern.system.fullpath);
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break;
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case SNES_ENVIRONMENT_SET_GEOMETRY:
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g_extern.system.geom = *(const struct snes_geometry*)data;
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g_extern.system.geom.max_width = next_pow2(g_extern.system.geom.max_width);
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g_extern.system.geom.max_height = next_pow2(g_extern.system.geom.max_height);
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SSNES_LOG("SET_GEOMETRY: (%ux%u) / (%ux%u)\n",
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g_extern.system.geom.base_width,
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g_extern.system.geom.base_height,
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g_extern.system.geom.max_width,
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g_extern.system.geom.max_height);
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break;
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case SNES_ENVIRONMENT_SET_PITCH:
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g_extern.system.pitch = *(const unsigned*)data;
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SSNES_LOG("SET_PITCH: %u\n", g_extern.system.pitch);
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break;
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case SNES_ENVIRONMENT_GET_OVERSCAN:
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*(bool*)data = !g_settings.video.crop_overscan;
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SSNES_LOG("GET_OVERSCAN: %u\n", (unsigned)!g_settings.video.crop_overscan);
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break;
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case SNES_ENVIRONMENT_SET_TIMING:
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g_extern.system.timing = *(const struct snes_system_timing*)data;
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g_extern.system.timing_set = true;
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break;
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case SNES_ENVIRONMENT_GET_CAN_DUPE:
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*(bool*)data = true;
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break;
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default:
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return false;
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}
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return true;
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}
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// Assume SNES as defaults.
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static void set_environment_defaults(void)
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{
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g_extern.system.pitch = 0; // 0 is classic libsnes semantics.
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g_extern.system.geom = (struct snes_geometry) {
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.base_width = 256,
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.base_height = 224,
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.max_width = 512,
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.max_height = 512,
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};
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}
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// SSNES extension hooks. Totally optional 'n shizz :)
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static void set_environment(void)
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{
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#ifdef HAVE_DYNAMIC
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dylib_t lib = lib_handle;
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#else
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dylib_t lib = NULL;
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#endif
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void (*psnes_set_environment)(snes_environment_t) =
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(void (*)(snes_environment_t))dylib_proc(lib, "snes_set_environment");
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if (psnes_set_environment)
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psnes_set_environment(environment_cb);
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set_environment_defaults();
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}
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#endif
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