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RetroArch/driver.c

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/* RetroArch - A frontend for libretro.
* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
* Copyright (C) 2011-2015 - Daniel De Matteis
*
* RetroArch is free software: you can redistribute it and/or modify it under the terms
* of the GNU General Public License as published by the Free Software Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with RetroArch.
* If not, see <http://www.gnu.org/licenses/>.
*/
#include "driver.h"
#include "general.h"
#include "retroarch.h"
#include "compat/posix_string.h"
#include "gfx/video_monitor.h"
#include "audio/audio_monitor.h"
#ifdef HAVE_MENU
#include "menu/menu.h"
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
driver_t driver;
/**
* find_driver_nonempty:
* @label : string of driver type to be found.
* @i : index of driver.
* @str : identifier name of the found driver
* gets written to this string.
* @sizeof_str : size of @str.
*
* Find driver based on @label.
*
* Returns: NULL if no driver based on @label found, otherwise
* pointer to driver.
**/
static const void *find_driver_nonempty(const char *label, int i,
char *str, size_t sizeof_str)
{
const void *drv = NULL;
if (!strcmp(label, "camera_driver"))
{
drv = camera_driver_find_handle(i);
if (drv)
strlcpy(str, camera_driver_find_ident(i), sizeof_str);
}
else if (!strcmp(label, "location_driver"))
{
drv = location_driver_find_handle(i);
if (drv)
strlcpy(str, location_driver_find_ident(i), sizeof_str);
}
#ifdef HAVE_MENU
else if (!strcmp(label, "menu_driver"))
{
drv = menu_driver_find_handle(i);
if (drv)
strlcpy(str, menu_driver_find_ident(i), sizeof_str);
}
#endif
else if (!strcmp(label, "input_driver"))
{
drv = input_driver_find_handle(i);
if (drv)
strlcpy(str, input_driver_find_ident(i), sizeof_str);
}
else if (!strcmp(label, "input_joypad_driver"))
{
drv = joypad_driver_find_handle(i);
if (drv)
strlcpy(str, joypad_driver_find_ident(i), sizeof_str);
}
else if (!strcmp(label, "video_driver"))
{
drv = video_driver_find_handle(i);
if (drv)
strlcpy(str, video_driver_find_ident(i), sizeof_str);
}
else if (!strcmp(label, "audio_driver"))
{
drv = audio_driver_find_handle(i);
if (drv)
strlcpy(str, audio_driver_find_ident(i), sizeof_str);
}
else if (!strcmp(label, "audio_resampler_driver"))
{
drv = audio_resampler_driver_find_handle(i);
if (drv)
strlcpy(str, audio_resampler_driver_find_ident(i), sizeof_str);
}
return drv;
}
/**
* find_driver_index:
* @label : string of driver type to be found.
* @drv : identifier of driver to be found.
*
* Find index of the driver, based on @label.
*
* Returns: -1 if no driver based on @label and @drv found, otherwise
* index number of the driver found in the array.
**/
int find_driver_index(const char * label, const char *drv)
{
unsigned i;
char str[PATH_MAX_LENGTH];
const void *obj = NULL;
for (i = 0; (obj = (const void*)
find_driver_nonempty(label, i, str, sizeof(str))) != NULL; i++)
{
if (!obj)
return -1;
if (str[0] == '\0')
break;
if (!strcasecmp(drv, str))
return i;
}
return -1;
}
/**
* find_prev_driver:
* @label : string of driver type to be found.
* @str : identifier of driver to be found.
* @sizeof_str : size of @str.
*
* Find previous driver in driver array.
**/
void find_prev_driver(const char *label, char *str, size_t sizeof_str)
{
int i = find_driver_index(label, str);
if (i > 0)
find_driver_nonempty(label, i - 1, str, sizeof_str);
else
RARCH_WARN(
"Couldn't find any previous driver (current one: \"%s\").\n", str);
}
/**
* find_next_driver:
* @label : string of driver type to be found.
* @str : identifier of driver to be found.
* @sizeof_str : size of @str.
*
* Find next driver in driver array.
**/
void find_next_driver(const char *label, char *str, size_t sizeof_str)
{
int i = find_driver_index(label, str);
if (i >= 0)
find_driver_nonempty(label, i + 1, str, sizeof_str);
else
RARCH_WARN("Couldn't find any next driver (current one: \"%s\").\n", str);
}
/**
* init_drivers_pre:
*
* Attempts to find a default driver for
* all driver types.
*
* Should be run before init_drivers().
**/
void init_drivers_pre(void)
{
find_audio_driver();
find_video_driver();
find_input_driver();
find_camera_driver();
find_location_driver();
#ifdef HAVE_MENU
find_menu_driver();
#endif
}
static void driver_adjust_system_rates(void)
{
audio_monitor_adjust_system_rates();
video_monitor_adjust_system_rates();
if (!driver.video_data)
return;
if (g_extern.system.force_nonblock)
rarch_main_command(RARCH_CMD_VIDEO_SET_NONBLOCKING_STATE);
else
driver_set_nonblock_state(driver.nonblock_state);
}
/**
* driver_set_refresh_rate:
* @hz : New refresh rate for monitor.
*
* Sets monitor refresh rate to new value by calling
* video_monitor_set_refresh_rate(). Subsequently
* calls audio_monitor_set_refresh_rate().
**/
void driver_set_refresh_rate(float hz)
{
video_monitor_set_refresh_rate(hz);
audio_monitor_set_refresh_rate();
driver_adjust_system_rates();
}
/**
* driver_set_nonblock_state:
* @enable : Enable nonblock state?
*
* Sets audio and video drivers to nonblock state.
*
* If @enable is false, sets blocking state for both
* audio and video drivers instead.
**/
void driver_set_nonblock_state(bool enable)
{
/* Only apply non-block-state for video if we're using vsync. */
if (driver.video_active && driver.video_data)
{
bool video_nonblock = enable;
if (!g_settings.video.vsync || g_extern.system.force_nonblock)
video_nonblock = true;
driver.video->set_nonblock_state(driver.video_data, video_nonblock);
}
if (driver.audio_active && driver.audio_data)
driver.audio->set_nonblock_state(driver.audio_data,
g_settings.audio.sync ? enable : true);
g_extern.audio_data.chunk_size = enable ?
g_extern.audio_data.nonblock_chunk_size :
g_extern.audio_data.block_chunk_size;
}
/**
* driver_update_system_av_info:
* @info : pointer to new A/V info
*
* Update the system Audio/Video information.
* Will reinitialize audio/video drivers.
* Used by RETRO_ENVIRONMENT_SET_SYSTEM_AV_INFO.
*
* Returns: true (1) if successful, otherwise false (0).
**/
bool driver_update_system_av_info(const struct retro_system_av_info *info)
{
g_extern.system.av_info = *info;
rarch_main_command(RARCH_CMD_REINIT);
/* Cannot continue recording with different parameters.
* Take the easiest route out and just restart the recording. */
if (driver.recording_data)
{
static const char *msg = "Restarting recording due to driver reinit.";
msg_queue_push(g_extern.msg_queue, msg, 2, 180);
RARCH_WARN("%s\n", msg);
rarch_main_command(RARCH_CMD_RECORD_DEINIT);
rarch_main_command(RARCH_CMD_RECORD_INIT);
}
return true;
}
/**
* init_drivers:
* @flags : Bitmask of drivers to initialize.
*
* Initializes drivers.
* @flags determines which drivers get initialized.
**/
void init_drivers(int flags)
{
if (flags & DRIVER_VIDEO)
driver.video_data_own = false;
if (flags & DRIVER_AUDIO)
driver.audio_data_own = false;
if (flags & DRIVER_INPUT)
driver.input_data_own = false;
if (flags & DRIVER_CAMERA)
driver.camera_data_own = false;
if (flags & DRIVER_LOCATION)
driver.location_data_own = false;
#ifdef HAVE_MENU
/* By default, we want the menu to persist through driver reinits. */
driver.menu_data_own = true;
#endif
if (flags & (DRIVER_VIDEO | DRIVER_AUDIO))
driver_adjust_system_rates();
if (flags & DRIVER_VIDEO)
{
g_extern.frame_count = 0;
init_video();
if (!driver.video_cache_context_ack
&& g_extern.system.hw_render_callback.context_reset)
g_extern.system.hw_render_callback.context_reset();
driver.video_cache_context_ack = false;
g_extern.system.frame_time_last = 0;
}
if (flags & DRIVER_AUDIO)
init_audio();
/* Only initialize camera driver if we're ever going to use it. */
if ((flags & DRIVER_CAMERA) && driver.camera_active)
init_camera();
/* Only initialize location driver if we're ever going to use it. */
if ((flags & DRIVER_LOCATION) && driver.location_active)
init_location();
#ifdef HAVE_MENU
if (flags & DRIVER_MENU)
{
init_menu();
if (driver.menu && driver.menu_ctx && driver.menu_ctx->context_reset)
driver.menu_ctx->context_reset(driver.menu);
}
#endif
if (flags & (DRIVER_VIDEO | DRIVER_AUDIO))
{
/* Keep non-throttled state as good as possible. */
if (driver.nonblock_state)
driver_set_nonblock_state(driver.nonblock_state);
}
}
/**
* uninit_drivers:
* @flags : Bitmask of drivers to deinitialize.
*
* Deinitializes drivers.
* @flags determines which drivers get deinitialized.
**/
void uninit_drivers(int flags)
{
if (flags & DRIVER_AUDIO)
uninit_audio();
if (flags & DRIVER_VIDEO)
{
if (g_extern.system.hw_render_callback.context_destroy &&
!driver.video_cache_context)
g_extern.system.hw_render_callback.context_destroy();
}
#ifdef HAVE_MENU
if (flags & DRIVER_MENU)
{
if (driver.menu && driver.menu_ctx && driver.menu_ctx->context_destroy)
driver.menu_ctx->context_destroy(driver.menu);
if (!driver.menu_data_own)
{
menu_free_list(driver.menu);
menu_free(driver.menu);
driver.menu = NULL;
}
}
#endif
if (flags & DRIVERS_VIDEO_INPUT)
uninit_video_input();
if ((flags & DRIVER_VIDEO) && !driver.video_data_own)
driver.video_data = NULL;
if ((flags & DRIVER_CAMERA) && !driver.camera_data_own)
{
uninit_camera();
driver.camera_data = NULL;
}
if ((flags & DRIVER_LOCATION) && !driver.location_data_own)
{
uninit_location();
driver.location_data = NULL;
}
if ((flags & DRIVER_INPUT) && !driver.input_data_own)
driver.input_data = NULL;
if ((flags & DRIVER_AUDIO) && !driver.audio_data_own)
driver.audio_data = NULL;
}
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