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  1. #include <SFML/Graphics.hpp>
  2. #include <cstdlib>
  3. #include <ctime>
  4. #include <map>
  5.  
  6. int main()
  7. {
  8.     std::srand(std::time(0));
  9.  
  10.     const int width  = 512;
  11.     const int height = 256;
  12.  
  13.     sf::Image image(width, height, sf::Color::White);
  14.  
  15.     image.SetSmooth(false);
  16.  
  17.     std::map<int, int> interiorId2offset;
  18.  
  19.     for (int i = 0; i < width; ++ i) {
  20.         for (int j = 0; j < height; ++ j) {
  21.  
  22.             int val = 0;
  23.             int offset = 0;
  24.  
  25.             if (j % 128 < 64)
  26.                 offset = 40;
  27.  
  28.             bool one = ((i + offset) % 128 < 2 || (i + offset) % 128 > 126);
  29.             bool two = ( j           %  64 < 2 ||  j           %  64 >  62);
  30.  
  31.             bool nearOne = (i % 128 < 8 || i % 128 > 120);
  32.             bool nearTwo = (j %  64 < 8 || j %  64 >  56);
  33.  
  34.             if (one && !nearTwo)
  35.                 val = 225;
  36.  
  37.             if (two && !nearOne)
  38.                 val = 225;
  39.  
  40.             bool interior = !one && !two;
  41.  
  42.             if (interior) {
  43.  
  44.                 int x = (i + offset) / 128;
  45.                 int y =  j           /  64;
  46.  
  47.                 if (x >= width / 128) x = 0; // in order to be tileable
  48.  
  49.                 int interiorOffset = interiorId2offset[x + 100 * y];
  50.  
  51.                 if (interiorOffset == 0) {
  52.  
  53.                     interiorOffset = std::rand() % 3 * 30 + 1;
  54.                     interiorId2offset[x + 100 * y] = interiorOffset;
  55.                 }
  56.  
  57.                 val = ((i + offset) % 128 + j % 64 + interiorOffset) % 256;
  58.  
  59.                 if (val <  25) val =  25;
  60.                 if (val > 175) val = 175;
  61.             }
  62.  
  63.             image.SetPixel(i, j, sf::Color(val, val, val));
  64.         }
  65.     }
  66.  
  67.     sf::Sprite sprite(image);
  68.  
  69.     sf::RenderWindow window(sf::VideoMode(width * 2, height * 2, 32), "Procedural Textures!");
  70.  
  71.     window.UseVerticalSync(true);
  72.  
  73.     bool Running = true;
  74.  
  75.     while (Running)
  76.     {
  77.         sf::Event Event;
  78.  
  79.         while (window.GetEvent(Event))
  80.         {
  81.             if (Event.Type == sf::Event::Closed)
  82.                 Running = false;
  83.  
  84.             if ((Event.Type == sf::Event::KeyPressed) && (Event.Key.Code == sf::Key::Escape))
  85.                 Running = false;
  86.         }
  87.  
  88.         window.Clear();
  89.  
  90.         window.Draw(sprite);
  91.         sprite.Move(width, 0);
  92.         window.Draw(sprite);
  93.         sprite.Move(0, height);
  94.         window.Draw(sprite);
  95.         sprite.Move(- width, 0);
  96.         window.Draw(sprite);
  97.         sprite.Move(0, - height);
  98.  
  99.         window.Display();
  100.     }
  101. }
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https://ideone.com/z9vLhW
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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