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"
#include "nametable_window.h"
#include "dbg_pattern_table.h"
#include "dbg_nametable.h"
#include "char_map.h"
#include "dbg_palette.h"

typedef struct nes_gui {
    NesMainWindow main_window;
    NesPatternWindow pattern_window;
    NesNametableWindow nametable_window;

    TTF_Font *font;

    Uint32 last_frame_tick;
    Uint32 frame_delay;

#if DEBUG
    unsigned long tick;
#endif
} 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;
    }

#if DEBUG
    gui.tick = 0;
    pattern_window_init(&gui.pattern_window);
    nametable_window_init(&gui.nametable_window);

    char_map_init(gui.main_window.sdl_context.renderer, gui.font);
#endif

    main_window_init(&gui.main_window);

    return true;
}

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

#if DEBUG
    char_map_uninit();

    pattern_window_uninit(&gui.pattern_window);
    nametable_window_uninit(&gui.nametable_window);
#endif

    TTF_CloseFont(gui.font);
}

void gui_post_sysinit() {
#if DEBUG
    dbg_palette_init();
    dbg_pattern_table_init();
    dbg_nametable_init();

    // TODO: The texture is rendered before the palette data is in the PPU memory, so the only color is grey
    pattern_window_build_table(&gui.pattern_window);
    nametable_window_update(&gui.nametable_window);
#endif
}

bool lctrl = false;

int gui_input() {
    SDL_Event event;

#if DEBUG
    PPUDebugFlags *ppu_debug = &ppu_get_state()->debug;
#endif

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

        if (event.type == SDL_KEYDOWN && event.key.keysym.sym == SDLK_LCTRL) {
            lctrl = true;
        }

        if (event.type == SDL_KEYUP) {
            switch (event.key.keysym.sym) {
                case SDLK_LCTRL:
                    lctrl = false;
                    break;
                case SDLK_p:
                    system_toggle_pause(lctrl);
                    break;
#if DEBUG
                case SDLK_t:
                    ppu_debug->flags.tile_debugger = !ppu_debug->flags.tile_debugger;
                    break;
                case SDLK_n:
                    ppu_debug->flags.tile_debugger_pattern_half = (ppu_debug->flags.tile_debugger_pattern_half + 1) % 3;
                    break;
                default:
                    pattern_window_key_up(&gui.pattern_window, event.key.keysym.sym);
                    break;
#else
                    default:
                        break;
#endif
            }
        }
    }

    return 1;
}

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

#if DEBUG
    dbg_palette_init();
    pattern_window_render(&gui.pattern_window);

    nametable_window_update(&gui.nametable_window);
    nametable_window_render(&gui.nametable_window);

    gui.tick++;
#endif
}

void gui_present() {
#if DEBUG
    pattern_window_present(&gui.pattern_window);
    nametable_window_present(&gui.nametable_window);
#endif

    main_window_present(&gui.main_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();
}

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