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Add automatic frame skipping

This commit is contained in:
bmaupin 2020-03-10 13:51:03 -04:00
parent 3f2f57c982
commit f484239f9c
2 changed files with 37 additions and 7 deletions
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42
libretro.c
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@ -47,6 +47,10 @@ static int translation_caches_inited = 0;
#define MAX_PATH (512)
#endif
// 59.72750057 hz
#define GBA_FPS ((float) GBC_BASE_RATE) / (308 * 228 * 4)
#define MAX_FRAME_TIME 1.0f / ((float) GBA_FPS)
frameskip_type current_frameskip_type = no_frameskip;
u32 frameskip_value = 4;
u32 random_skip = 0;
@ -55,6 +59,10 @@ u32 skip_next_frame = 0;
u32 frameskip_counter = 0;
u32 num_skipped_frames = 0;
static float frame_time;
static retro_log_printf_t log_cb;
static retro_video_refresh_t video_cb;
static retro_input_poll_t input_poll_cb;
@ -181,8 +189,7 @@ void retro_get_system_av_info(struct retro_system_av_info* info)
info->geometry.max_width = GBA_SCREEN_WIDTH;
info->geometry.max_height = GBA_SCREEN_HEIGHT;
info->geometry.aspect_ratio = 0;
// 59.72750057 hz
info->timing.fps = ((float) GBC_BASE_RATE) / (308 * 228 * 4);
info->timing.fps = ((float) GBA_FPS);
info->timing.sample_rate = GBA_SOUND_FREQUENCY;
}
@ -322,8 +329,8 @@ void retro_set_environment(retro_environment_t cb)
#ifdef HAVE_DYNAREC
{ "gpsp_drc", "Dynamic recompiler (restart); enabled|disabled" },
#endif
{ "gpsp_frameskip_type", "Frameskip type; off|manual" },
{ "gpsp_frameskip_value", "Frameskip value; 1|2|3|4|5|6|7|8|9|0" },
{ "gpsp_frameskip_type", "Frameskip type; off|manual|automatic" },
{ "gpsp_frameskip_value", "Frameskip value; 1|2|3|4|5|6|7|8|9" },
{ "gpsp_frameskip_variation", "Frameskip variation; uniform|random" },
{ NULL, NULL },
};
@ -466,6 +473,8 @@ static void check_variables(int started_from_load)
{
if (!strcmp(var.value, "off"))
current_frameskip_type = no_frameskip;
else if (!strcmp(var.value, "automatic"))
current_frameskip_type = auto_frameskip;
else if (!strcmp(var.value, "manual"))
current_frameskip_type = manual_frameskip;
}
@ -500,6 +509,11 @@ static void set_input_descriptors()
environ_cb(RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS, descriptors);
}
static void frame_time_cb(retro_usec_t usec)
{
frame_time = usec / 1000000.0;
}
bool retro_load_game(const struct retro_game_info* info)
{
if (!info)
@ -541,6 +555,9 @@ bool retro_load_game(const struct retro_game_info* info)
dynarec_enable = 0;
#endif
struct retro_frame_time_callback frame_cb = { frame_time_cb, 1000000 / ((float) GBA_FPS) };
environ_cb(RETRO_ENVIRONMENT_SET_FRAME_TIME_CALLBACK, &frame_cb);
char filename_bios[MAX_PATH];
const char* dir = NULL;
@ -663,7 +680,22 @@ void retro_run(void)
skip_next_frame = 0;
if(current_frameskip_type == manual_frameskip)
if(current_frameskip_type == auto_frameskip)
{
if(frame_time > MAX_FRAME_TIME)
{
if(num_skipped_frames < frameskip_value)
{
skip_next_frame = 1;
num_skipped_frames++;
}
else
{
num_skipped_frames = 0;
}
}
}
else if(current_frameskip_type == manual_frameskip)
{
frameskip_counter = (frameskip_counter + 1) %
(used_frameskip + 1);

2
main.h
View File

@ -100,8 +100,6 @@ u32 file_length(const char *filename, s32 dummy);
u32 file_length(const char *dummy, FILE *fp);
#endif
extern u32 real_frame_count;
extern u32 virtual_frame_count;
extern u32 num_skipped_frames;
extern int dynarec_enable;