mii_emu/ui_gl/mii_thread.c

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/*
* mii_thread.c
*
* Copyright (C) 2023 Michel Pollet <buserror@gmail.com>
*
* SPDX-License-Identifier: MIT
*/
#include <pthread.h>
#include <unistd.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/timerfd.h>
// probably should wrap these into a HAVE_JOYSTICK define for non-linux
#ifndef HAVE_JOYSTICK
#define HAVE_JOYSTICK 1
#endif
#include "mii.h"
#include "mii_thread.h"
#include <time.h>
typedef uint64_t mii_time_t;
enum {
MII_TIME_RES = 1,
MII_TIME_SECOND = 1000000,
MII_TIME_MS = (MII_TIME_SECOND/1000),
};
mii_time_t
mii_get_time()
{
struct timespec tim;
clock_gettime(CLOCK_MONOTONIC_RAW, &tim);
uint64_t time = ((uint64_t)tim.tv_sec) * (1000000 / MII_TIME_RES) +
tim.tv_nsec / (1000 * MII_TIME_RES);
return time;
}
static float default_fps = 60;
mii_th_fifo_t signal_fifo;
int
mii_thread_set_fps(
int timerfd,
float fps)
{
default_fps = fps;
long target_fps_us = 1000000 / default_fps;
struct itimerspec its = {
.it_interval = { .tv_sec = 0, .tv_nsec = target_fps_us * 1000 },
.it_value = { .tv_sec = 0, .tv_nsec = target_fps_us * 1000 },
};
if (timerfd_settime(timerfd, 0, &its, NULL) < 0) {
perror(__func__);
return -1;
}
return 0;
}
static void *
mii_thread_cpu_regulator(
void *arg)
{
mii_t *mii = (mii_t *) arg;
uint32_t running = 1;
// use a timerfd as regulation
int timerfd = timerfd_create(CLOCK_MONOTONIC, 0);
if (timerfd < 0) {
perror(__func__);
return NULL;
}
mii_thread_set_fps(timerfd, default_fps);
mii->state = MII_RUNNING;
uint32_t last_frame = mii->video.frame_count;
while (running) {
mii_th_signal_t sig;
while (!mii_th_fifo_isempty(&signal_fifo)) {
sig = mii_th_fifo_read(&signal_fifo);
switch (sig.cmd) {
case SIGNAL_RESET:
mii_reset(mii, sig.data);
break;
case SIGNAL_STOP:
mii_dump_run_trace(mii);
mii_dump_trace_state(mii);
mii->state = MII_STOPPED;
break;
case SIGNAL_STEP:
mii->state = MII_STEP;
running = 1;
break;
case SIGNAL_RUN:
mii->state = MII_RUNNING;
running = 1;
break;
}
}
if (mii->state != MII_STOPPED)
mii_run(mii);
bool sleep = false;
switch (mii->state) {
case MII_STOPPED:
sleep = true;
break;
case MII_STEP:
sleep = true;
if (running) {
running--;
mii_dump_trace_state(mii);
running = 1;
if (mii->trace.step_inst)
mii->trace.step_inst--;
if (mii->trace.step_inst == 0)
mii->state = MII_STOPPED;
}
break;
case MII_RUNNING:
sleep = mii->video.frame_count != last_frame;
if (sleep)
last_frame = mii->video.frame_count;
break;
case MII_TERMINATE:
running = 0;
break;
}
if (sleep) {
uint64_t timer_v;
read(timerfd, &timer_v, sizeof(timer_v));
}
}
mii_dispose(mii); // this sets mii->state to MII_INIT
return NULL;
}
#if HAVE_JOYSTICK
#include <linux/joystick.h>
static void *
mii_thread_joystick(
void *arg)
{
int fd = open("/dev/input/js0", O_RDONLY);
if (fd < 0) {
printf("No joystick found\n");
return NULL;
}
uint8_t axes, buttons;
if (ioctl(fd, JSIOCGAXES, &axes) == -1 ||
ioctl(fd, JSIOCGBUTTONS, &buttons) == -1) {
perror(__func__);
return NULL;
}
char name[128];
if (ioctl(fd, JSIOCGNAME(sizeof(name)), name) == -1) {
perror(__func__);
return NULL;
}
printf("Joystick found: '%s'\n", name);
#if 0
printf(" %d axes, %d buttons\n", axes, buttons);
// get and print mappings
struct js_corr corr[axes] = {};
if (ioctl(fd, JSIOCGCORR, corr) == -1) {
perror(__func__);
// return NULL;
}
printf(" %d axes, %d buttons\n", axes, buttons);
for (int i = 0; i < axes; i++) {
printf("coor %d: type %d, prec %d: %d %d %d %d\n", i,
corr[i].type, corr[i].prec,
corr[i].coef[0], corr[i].coef[1],
corr[i].coef[2], corr[i].coef[3]);
}
printf("Joystick thread started: %d axis, %d buttons\n", axes, buttons);
#endif
struct js_event event;
mii_t *mii = (mii_t *)arg;
mii->analog.v[0].value = 127;
mii->analog.v[1].value = 127;
do {
ssize_t rd = read(fd, &event, sizeof(event));
if (rd != sizeof(event)) {
perror(__func__);
break;
}
switch (event.type) {
case JS_EVENT_BUTTON:
// printf("button %u %s\n", event.number, event.value ? "pressed" : "released");
switch (event.number) {
case 2 ... 3:
mii_bank_poke(&mii->bank[MII_BANK_MAIN],
0xc061 + (event.number - 2),
event.value ? 0x80 : 0);
break;
case 4 ... 5:
mii_bank_poke(&mii->bank[MII_BANK_MAIN],
0xc061 + (event.number - 4),
event.value ? 0x80 : 0);
break;
}
break;
case JS_EVENT_AXIS:
switch (event.number) {
case 0 ... 1: {// X
uint32_t v = (event.value + 0x8000) / 256;
if (v > 255)
v = 255;
mii->analog.v[event.number ? 1 : 0].value = v;
// printf("axis %u %6d %3dx%3d\n"
// event.number, event.value,
// mii->analog.v[0].value, mii->analog.v[1].value);
} break;
}
break;
default:
/* Ignore init events. */
break;
}
} while (1);
close(fd);
printf("Joystick thread terminated\n");
return NULL;
}
#endif
pthread_t
mii_thread_start(
mii_t *mii)
{
const mii_th_fifo_t zero = {};
signal_fifo = zero;
pthread_t cpu, joystick;
pthread_create(&cpu, NULL, mii_thread_cpu_regulator, mii);
#if HAVE_JOYSTICK
pthread_create(&joystick, NULL, mii_thread_joystick, mii);
#endif
return cpu;
}
struct mii_th_fifo_t*
mii_thread_get_fifo(
struct mii_t *mii)
{
return &signal_fifo;
}