nesemu/gui/nametable_window.c

//
// Created by william on 12/07/24.
//

#include "nametable_window.h"
#include "dbg_nametable.h"

#define NW_WIDTH (NW_ROW_TILE_COUNT * PATTERN_DRAW_SIZE)
#define NW_HEIGHT (NW_ROW_COUNT * PATTERN_DRAW_SIZE)
#define NW_BUFFER_SIZE (NAMETABLE_ROW_WIDTH * NAMETABLE_COL_HEIGHT * PATTERN_DRAW_SIZE * PATTERN_DRAW_SIZE)

void nametable_window_init(NesNametableWindow *window) {
    window->sdl_context = window_init("Nametable", NW_WIDTH, NW_HEIGHT, NW_SCALE);

    window->texture = SDL_CreateTexture(window->sdl_context.renderer, SDL_PIXELFORMAT_ARGB8888,
                                        SDL_TEXTUREACCESS_STREAMING, NW_WIDTH, NW_HEIGHT);
}

void nametable_window_uninit(NesNametableWindow *window) {
    SDL_DestroyTexture(window->texture);
    window_uninit(window->sdl_context);
}

void nametable_window_update_bank(NesNametableWindow *window, int bank, pixel *buffer) {
    dbg_nametable_render_bank(bank, buffer);

    SDL_Rect rect;
    rect.w = NAMETABLE_ROW_WIDTH * PATTERN_DRAW_SIZE;
    rect.h = NAMETABLE_COL_HEIGHT * PATTERN_DRAW_SIZE;
    rect.x = (bank & 1) * rect.w;
    rect.y = ((bank & 2) >> 1) * rect.h;

    SDL_UpdateTexture(window->texture, &rect, buffer, (NW_WIDTH / 2) * sizeof(pixel));
}

void nametable_window_update(NesNametableWindow *window) {
    dbg_nametable_update();

    pixel buffer[NW_BUFFER_SIZE * 4] = {0};
    nametable_window_update_bank(window, 0, buffer);
    nametable_window_update_bank(window, 1, buffer);
    nametable_window_update_bank(window, 2, buffer);
    nametable_window_update_bank(window, 3, buffer);
}

void nametable_window_render(NesNametableWindow *window) {
    SDL_RenderClear(window->sdl_context.renderer);
    SDL_RenderCopy(window->sdl_context.renderer, window->texture, NULL, NULL);
}

void nametable_window_present(NesNametableWindow *window) {
    SDL_RenderPresent(window->sdl_context.renderer);
}