nesemu/gui/gui.c

//
// Created by william on 16/05/24.
//

#include <SDL_ttf.h>
#include "log.h"
#include "gui.h"
#include "main_window.h"
#include "pattern_window.h"
#include "../include/system.h"

typedef struct nes_gui {
    NesMainWindow main_window;
    NesPatternWindow pattern_window;

    TTF_Font *font;

    // Debug info
    bool debug_enabled;
    Uint32 last_frame_tick;
    Uint32 frame_delay;
} NesGui;
NesGui gui;

bool gui_init() {
    TTF_Init();
    gui.font = TTF_OpenFont("../nintendo-nes-font.ttf", 16);
    if (gui.font == NULL) {
        log_error("Failed to open TTF font");
        return false;
    }

    gui.debug_enabled = false;

    main_window_init(&gui.main_window, gui.font);

    if (gui.debug_enabled) {
        pattern_window_init(&gui.pattern_window);
    }

    return true;
}

void gui_uninit() {
    main_window_uninit(&gui.main_window);

    if (gui.debug_enabled) {
        pattern_window_uninit(&gui.pattern_window);
    }

    TTF_CloseFont(gui.font);
}

void gui_post_sysinit() {
    byte *pattern_memory = system_get_mapper()->ppu_read(0);
    pattern_window_build_table(&gui.pattern_window, pattern_memory);
}

int gui_input() {
    SDL_Event event;

    while (SDL_PollEvent(&event)) {
        if (event.type == SDL_WINDOWEVENT && event.window.event == SDL_WINDOWEVENT_CLOSE) {
            return -1;
        }
    }

    return 1;
}

void gui_render() {
    main_window_render(&gui.main_window, ppu_get_state()->pixels);

    if (gui.debug_enabled) {
        pattern_window_render(&gui.pattern_window);
    }
}

void gui_present() {
    main_window_present(&gui.main_window);

    if (gui.debug_enabled) {
        pattern_window_present(&gui.pattern_window);
    }
}

void gui_delay() {
    Uint32 tick_now = SDL_GetTicks();
    gui.frame_delay = tick_now - gui.last_frame_tick;

    if (gui.frame_delay < 16) {
        Uint32 additional_delay = 16 - gui.frame_delay;
        SDL_Delay(additional_delay);
        gui.frame_delay += additional_delay;
    }

    gui.last_frame_tick = SDL_GetTicks();
}

bool gui_debug_enabled() {
    return gui.debug_enabled;
}

unsigned int gui_get_frame_delay() {
    return gui.frame_delay;
}