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libretro.c
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libretro.c
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#include "libretro.h"
#include <stdint.h>
#include <stdlib.h>
#define WIDHT 960
#define HEIGHT 540
#define FPS 60
typedef enum
{
MIDI_TEST_OFF,
MIDI_TEST_METRONOME,
MIDI_TEST_LOOPBACK,
MIDI_TEST_KEYBOARD
} midi_test_t;
retro_environment_t g_env;
struct retro_log_callback * g_log_cb;
struct retro_midi_interface * g_midi_iface;
uint16_t * g_video_frame;
retro_video_refresh_t g_video_refresh;
retro_input_poll_t g_input_poll;
retro_input_state_t g_input_state;
midi_test_t g_midi_test;
void run_metronome_test(void)
{
static unsigned i;
static int frames_elapsed;
static uint8_t data[2][3] =
{
{ 0x99, 35, 127 },
{ 0x89, 35, 127 }
};
if (!g_midi_iface->output_enabled())
return;
if (frames_elapsed == 0)
{
if ((!g_midi_iface->write(data[i][0], 250000) ||
!g_midi_iface->write(data[i][1], 320) ||
!g_midi_iface->write(data[i][2], 320)) && g_log_cb)
g_log_cb->log(RETRO_LOG_ERROR, "Metronome Test: write error.\n");
i ^= 1;
}
if (++frames_elapsed == FPS / 4)
frames_elapsed = 0;
}
void run_loopback_test(void)
{
uint8_t data;
if (!g_midi_iface->input_enabled())
return;
while (g_midi_iface->read(&data))
{
if (!g_midi_iface->output_enabled())
continue;
if (!g_midi_iface->write(data, 0) && g_log_cb)
g_log_cb->log(RETRO_LOG_ERROR, "Loopback Test: write error.\n");
}
}
void run_keyboard_test(void)
{
uint8_t i;
static uint16_t old_keys_state;
uint16_t new_keys_state = 0;
if (!g_midi_iface->output_enabled())
return;
new_keys_state |= g_input_state(0, RETRO_DEVICE_KEYBOARD, 0, RETROK_z) ? 1 : 0;
new_keys_state |= g_input_state(0, RETRO_DEVICE_KEYBOARD, 0, RETROK_s) ? 2 : 0;
new_keys_state |= g_input_state(0, RETRO_DEVICE_KEYBOARD, 0, RETROK_x) ? 4 : 0;
new_keys_state |= g_input_state(0, RETRO_DEVICE_KEYBOARD, 0, RETROK_d) ? 8 : 0;
new_keys_state |= g_input_state(0, RETRO_DEVICE_KEYBOARD, 0, RETROK_c) ? 16 : 0;
new_keys_state |= g_input_state(0, RETRO_DEVICE_KEYBOARD, 0, RETROK_v) ? 32 : 0;
new_keys_state |= g_input_state(0, RETRO_DEVICE_KEYBOARD, 0, RETROK_g) ? 64 : 0;
new_keys_state |= g_input_state(0, RETRO_DEVICE_KEYBOARD, 0, RETROK_b) ? 128 : 0;
new_keys_state |= g_input_state(0, RETRO_DEVICE_KEYBOARD, 0, RETROK_h) ? 256 : 0;
new_keys_state |= g_input_state(0, RETRO_DEVICE_KEYBOARD, 0, RETROK_n) ? 512 : 0;
new_keys_state |= g_input_state(0, RETRO_DEVICE_KEYBOARD, 0, RETROK_j) ? 1024 : 0;
new_keys_state |= g_input_state(0, RETRO_DEVICE_KEYBOARD, 0, RETROK_m) ? 2048 : 0;
if (new_keys_state == old_keys_state)
return;
for (i = 0; i < 12; ++i)
{
if ((new_keys_state & (1 << i)) != (old_keys_state & (1 << i)))
{
bool key_down = new_keys_state & (1 << i);
if ((!g_midi_iface->write(key_down ? 0x90 : 0x80, 0) ||
!g_midi_iface->write(60 + i, 0) ||
!g_midi_iface->write(127, 0)) && g_log_cb)
g_log_cb->log(RETRO_LOG_ERROR, "Keyboard Test: write error.\n");
}
}
old_keys_state = new_keys_state;
}
void retro_set_environment(retro_environment_t env)
{
bool support = true;
env(RETRO_ENVIRONMENT_SET_SUPPORT_NO_GAME, &support);
g_env = env;
}
void retro_set_video_refresh(retro_video_refresh_t video_refresh)
{
g_video_refresh = video_refresh;
}
void retro_set_audio_sample(retro_audio_sample_t p)
{
(void)p;
}
void retro_set_audio_sample_batch(retro_audio_sample_batch_t p)
{
(void)p;
}
void retro_set_input_poll(retro_input_poll_t input_poll)
{
g_input_poll = input_poll;
}
void retro_set_input_state(retro_input_state_t input_state)
{
g_input_state = input_state;
}
void retro_init(void)
{
static struct retro_log_callback callback;
static struct retro_midi_interface interface;
if (g_env(RETRO_ENVIRONMENT_GET_LOG_INTERFACE, &callback))
g_log_cb = &callback;
else
g_log_cb = NULL;
if(g_env(RETRO_ENVIRONMENT_GET_MIDI_INTERFACE, &interface))
g_midi_iface = &interface;
else
{
g_midi_iface = NULL;
if (g_log_cb)
g_log_cb->log(RETRO_LOG_ERROR, "MIDI interface unavailable.\n");
}
}
void retro_deinit(void)
{
}
unsigned retro_api_version(void)
{
return RETRO_API_VERSION;
}
void retro_get_system_info(struct retro_system_info *info)
{
info->library_name = "MIDI Test";
info->library_version = "v0.1.0";
info->valid_extensions = "";
info->block_extract = false;
info->need_fullpath = false;
}
void retro_get_system_av_info(struct retro_system_av_info *info)
{
info->geometry.aspect_ratio = (float)WIDHT / (float)HEIGHT;
info->geometry.base_height = HEIGHT;
info->geometry.base_width = WIDHT;
info->geometry.max_height = HEIGHT;
info->geometry.max_width = WIDHT;
info->timing.fps = FPS;
info->timing.sample_rate = 0.0;
}
void retro_set_controller_port_device(unsigned p1, unsigned p2)
{
(void)p1;
(void)p2;
}
void retro_reset(void)
{
}
void retro_run(void)
{
midi_test_t old_midi_test = g_midi_test;
g_input_poll();
if (g_input_state(0, RETRO_DEVICE_KEYBOARD, 0, RETROK_0))
g_midi_test = MIDI_TEST_OFF;
else if (g_input_state(0, RETRO_DEVICE_KEYBOARD, 0, RETROK_1))
g_midi_test = MIDI_TEST_METRONOME;
else if (g_input_state(0, RETRO_DEVICE_KEYBOARD, 0, RETROK_2))
g_midi_test = MIDI_TEST_LOOPBACK;
else if (g_input_state(0, RETRO_DEVICE_KEYBOARD, 0, RETROK_3))
g_midi_test = MIDI_TEST_KEYBOARD;
if (g_midi_test != old_midi_test)
{
struct retro_message message;
if (g_midi_test == MIDI_TEST_METRONOME)
message.msg = "Metronome test: ~120 BPM, note B1, channel 10";
else if (g_midi_test == MIDI_TEST_LOOPBACK)
message.msg = "Loopback test: input to output";
else if (g_midi_test == MIDI_TEST_KEYBOARD)
message.msg = "Keyboard test: keys Z..M, notes C4..B4, channel 1";
else
message.msg = "MIDI test off";
message.frames = FPS * 4;
g_env(RETRO_ENVIRONMENT_SET_MESSAGE, &message);
}
if (g_midi_iface)
{
if (g_midi_test == MIDI_TEST_METRONOME)
run_metronome_test();
else if (g_midi_test == MIDI_TEST_LOOPBACK)
run_loopback_test();
else if (g_midi_test == MIDI_TEST_KEYBOARD)
run_keyboard_test();
g_midi_iface->flush();
}
g_video_refresh(g_video_frame, WIDHT, HEIGHT, sizeof(uint16_t) * WIDHT);
}
size_t retro_serialize_size()
{
return 0;
}
bool retro_serialize(void *p1, size_t p2)
{
(void)p1;
(void)p2;
return false;
}
bool retro_unserialize(const void *p1, size_t p2)
{
(void)p1;
(void)p2;
return false;
}
void retro_cheat_reset(void)
{
}
void retro_cheat_set(unsigned p1, bool p2, const char *p3)
{
(void)p1;
(void)p2;
(void)p3;
}
bool retro_load_game(const struct retro_game_info *p)
{
(void)p;
if (g_midi_iface == NULL)
return false;
g_video_frame = (uint16_t *)calloc(sizeof(uint16_t) * WIDHT * HEIGHT, 1);
g_midi_test = MIDI_TEST_OFF;
return g_video_frame != NULL;
}
bool retro_load_game_special(unsigned p1, const struct retro_game_info *p2, size_t p3)
{
(void)p1;
(void)p2;
(void)p3;
return false;
}
void retro_unload_game(void)
{
free(g_video_frame);
}
unsigned retro_get_region(void)
{
return RETRO_REGION_NTSC;
}
void *retro_get_memory_data(unsigned p)
{
(void)p;
return NULL;
}
size_t retro_get_memory_size(unsigned p)
{
(void)p;
return 0;
}