nesemu/system.c

//
// Created by william on 12/23/23.
//

#include "include/cpu.h"
#include "include/system.h"
#include "memory.h"
#include "cpu.h"

System current_sys;

void system_init() {
    cpu_init();
    ppu_init();

    current_sys.mapper = get_mapper(MAPPER_TYPE_SIMPLE);
    current_sys.cycle_count = 7;
}

void system_start() {
    address pc = mem_get_word(0xfffc);
    cpu_get_state()->program_counter = pc;
}

void system_next_frame() {
    for (int cpu_c = 0; cpu_c < CPU_CYCLE_PER_FRAME; cpu_c++) {
        if (!current_sys.paused) {
            cpu_cycle();
        }

        if (!current_sys.ppu_paused) {
            for (int ppu_c = 0; ppu_c < PPU_CYCLE_PER_CPU_CYCLE; ppu_c++) {
                ppu_cycle();
            }
        }
    }
}

void system_toggle_pause(bool pause_ppu) {
    current_sys.paused = !current_sys.paused;

    if (!current_sys.paused) {
        current_sys.ppu_paused = false;
    } else if (pause_ppu) {
        current_sys.ppu_paused = true;
    }
}

void system_uninit() {
}

unsigned int system_get_cycles() {
    return current_sys.cycle_count;
}

void system_add_cycles(unsigned int cycles) {
    current_sys.cycle_count += cycles;
}

Mapper *system_get_mapper() {
    return &current_sys.mapper;
}