celumato.h

#ifndef CELUMATO_H_
#define CELUMATO_H_

#include <SDL2/SDL.h>

int scc(int code) {
  if(code < 0) {
    fprintf(stderr, "SDL ERROR: %s\n", SDL_GetError());
    exit(1);
  }
  return code;
}

void *scp(void *ptr) {
  if(ptr == NULL) {
    fprintf(stderr, "SDL ERROR: %s\n", SDL_GetError());
    exit(1);
  }
  return ptr;
}

#define SCREEN_WIDTH 1024
#define SCREEN_HEIGHT 768

#define BACKGROUND_COLOR 0x181818ff
#define HEX_COLOR_UNPACK(color) \
  ((color >> (8 * 3)) & 0xFF),  \
  ((color >> (8 * 2)) & 0xFF),  \
  ((color >> (8 * 1)) & 0xFF),  \
  ((color >> (8 * 0)) & 0xFF)

#define ROWS 100
#define COLS 100
#define CELL_WIDTH ((float) SCREEN_WIDTH / (float) COLS)
#define CELL_HEIGHT ((float) SCREEN_HEIGHT / (float)ROWS)

/*
 *
  return scp(SDL_CreateWindow(
          "Celumato",
          0,0,
          SCREEN_WIDTH, SCREEN_HEIGHT,
          SDL_WINDOW_RESIZABLE));
 * */
SDL_Window *celumato_create_window(void) {
  return scp(SDL_CreateWindow(
          "Celumato",
          SCREEN_WIDTH, SCREEN_HEIGHT,
          0,0,
          SDL_WINDOW_RESIZABLE
        ));
}

SDL_Renderer *celumato_create_renderer(SDL_Window * window) {
  SDL_Renderer *renderer =
    scp(SDL_CreateRenderer(window,
                           -1,
                           SDL_RENDERER_ACCELERATED));

    scc(SDL_RenderSetLogicalSize(renderer,
                                 SCREEN_WIDTH,
                                 SCREEN_HEIGHT));
    return renderer;
}

void celumato_fill_rect(SDL_Renderer *renderer, float x, float y, float w, float h, Uint32 color) {
  SDL_Rect rect = {
    .x = (int) floorf(x),
    .y = (int) floorf(y),
    .w = (int) floorf(w),
    .h = (int) floorf(h),
  };

  scc(SDL_SetRenderDrawColor(
        renderer,
        HEX_COLOR_UNPACK(color)));

  scc(SDL_RenderFillRect(renderer, &rect));
}

int mod(int a, int b) {
  return (a % b + b) % b;
}
#endif