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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 ;
  14.     image.create(width, height, sf::Color::White) ;
  15.  
  16.     std::map<int, int> interiorId2offset;
  17.  
  18.     for (int i = 0; i < width; ++ i) {
  19.         for (int j = 0; j < height; ++ j) {
  20.  
  21.             int val = 0;
  22.             int offset = 0;
  23.  
  24.             if (j % 128 < 64)
  25.                 offset = 40;
  26.  
  27.             bool one = ((i + offset) % 128 < 2 || (i + offset) % 128 > 126);
  28.             bool two = ( j           %  64 < 2 ||  j           %  64 >  62);
  29.  
  30.             bool nearOne = (i % 128 < 8 || i % 128 > 120);
  31.             bool nearTwo = (j %  64 < 8 || j %  64 >  56);
  32.  
  33.             if (one && !nearTwo)
  34.                 val = 225;
  35.  
  36.             if (two && !nearOne)
  37.                 val = 225;
  38.  
  39.             bool interior = !one && !two;
  40.  
  41.             if (interior) {
  42.  
  43.                 int x = (i + offset) / 128;
  44.                 int y =  j           /  64;
  45.  
  46.                 if (x >= width / 128) x = 0; // in order to be tileable
  47.  
  48.                 int interiorOffset = interiorId2offset[x + 100 * y];
  49.  
  50.                 if (interiorOffset == 0) {
  51.  
  52.                     interiorOffset = std::rand() % 3 * 30 + 1;
  53.                     interiorId2offset[x + 100 * y] = interiorOffset;
  54.                 }
  55.  
  56.                 val = ((i + offset) % 128 + j % 64 + interiorOffset) % 256;
  57.  
  58.                 if (val <  25) val =  25;
  59.                 if (val > 175) val = 175;
  60.             }
  61.  
  62.             image.setPixel(i, j, sf::Color(val, val, val));
  63.         }
  64.     }
  65.  
  66.     sf::Texture t ;
  67.     t.loadFromImage(image) ;
  68.     sf::Sprite sprite(t);
  69.  
  70.     sf::RenderWindow window(sf::VideoMode(width * 2, height * 2, 32), "Procedural Textures!");
  71.  
  72.     window.setVerticalSyncEnabled(true) ;
  73.  
  74.     bool Running = true;
  75.  
  76.     while (Running)
  77.     {
  78.         sf::Event Event;
  79.         while (window.pollEvent(Event))
  80.         {
  81.             if (Event.type == sf::Event::Closed)
  82.                 Running = false;
  83.  
  84.             if ((Event.type == sf::Event::KeyPressed) && (Event.key.code == sf::Keyboard::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/Vg7gGq
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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