Experiment with biomes

src/MapGenerator.php

@@ -18,15 +18,13 @@ class MapGenerator
         $this->noise = new Noise($seed);
     }
 
-    public function getPixels(): array
+    public function getPixels(): iterable
     {
-        $pixels = [];
         for ($x = 0; $x < $this->width; $x++) {
             for ($y = 0; $y < $this->height; $y++) {
-                $pixels[] = $this->drawPixel($x, $y, $this->noise->generate($x, $y));
+                yield $this->drawPixel($x, $y, $this->noise->generate($x, $y));
             }
         }
-        return $pixels;
     }
 
     private function drawPixel(int $x, int $y, Color $color): string

src/Noise.php

@@ -6,18 +6,20 @@ use Ardent\Game\dto\Color;
 
 class Noise
 {
-    private readonly PerlinNoise $noise;
+    private readonly PerlinNoise $height;
+    private readonly PerlinNoise $biome;
 
     public function __construct(
         ?int $seed = null,
     )
     {
-        $this->noise = new PerlinNoise($seed);
+        $this->height = new PerlinNoise($seed);
+        $this->biome = new PerlinNoise($seed + 1);
     }
 
-    private function getTransitions(): array
+    private function getGrassland(): array
     {
-        $deepwater = new Color('#006eb4');
+        $deepwater = new Color(0, 110, 180);
         $water = new Color(0, 156, 244);
         $sand = new Color(238, 226, 104);
         $grass = new Color(25, 171, 64);
@@ -26,7 +28,7 @@ class Noise
 
         return [
             [-1.0, $deepwater],
-            [-0.9, $water],
+            [-0.997, $water],
             [0.0, $sand],
             [0.8, $grass],
             [0.997, $mountain],
@@ -34,22 +36,46 @@ class Noise
         ];
     }
 
+    private function getDesert(): array
+    {
+        $lightSand = new Color(248, 255, 111);
+        $sand = new Color(238, 226, 104);
+        $darkSand = new Color(161, 153, 70);
+
+        return [
+            [-1.0, $sand],
+            [1.0, $darkSand],
+        ];
+    }
+
     public function generate(int $x, int $y): Color
     {
-        $rand = $this->noise->random2D($x, $y, 150);
-        $transitions = $this->getTransitions();
+        $height = $this->height->random2D($x, $y, 150);
 
-        for ($i = 0; $i < count($transitions) - 1; $i++) {
-            $transition = $transitions[$i];
-            $nextTransition = $transitions[$i + 1];
-            if ($rand >= $transition[0] && $rand < $nextTransition[0]) {
-                return $this->lerpTerrain($transition[1], $nextTransition[1], $transition[0], $nextTransition[0], $rand);
-            }
-        }
+//        $biomes = [
+//            [-1.0, $this->transitionTerrain($this->getGrassland(), $height)],
+//            [1.01, $this->transitionTerrain($this->getDesert(), $height)],
+//        ];
+//        $biome = $this->biome->random2D($x, $y, 200, 5);
+
+        return $this->transitionTerrain($this->getGrassland(), $height);
     }
 
     public function lerpTerrain(Color $color1, Color $color2, float $begin, float $end, float $value): Color
     {
         return $color1->lerp($color2, ($value - $begin) * (1.0 / ($end - $begin)));
     }
+
+    public function transitionTerrain(array $transitions, float $height): Color
+    {
+        $color = new Color('#000000');
+        for ($i = 0; $i < count($transitions) - 1; $i++) {
+            $transition = $transitions[$i];
+            $nextTransition = $transitions[$i + 1];
+            if ($height >= $transition[0] && $height < $nextTransition[0]) {
+                $color = $this->lerpTerrain($transition[1], $nextTransition[1], $transition[0], $nextTransition[0], $height);
+            }
+        }
+        return $color;
+    }
 }

src/PerlinNoise.php

@@ -148,7 +148,7 @@ class PerlinNoise
         return $value;
     }
 
-    function random2D(float $x, float $y, ?int $size = NULL): float
+    function random2D(float $x, float $y, ?int $size = null, float $multiplier = 1.0): float
     {
         if ($size === NULL) {
             $size = $this->_default_size;
@@ -167,7 +167,7 @@ class PerlinNoise
 
 //        $value /= 2.0;
 
-        return $this->sigmoid($value);
+        return $this->sigmoid($value * $multiplier);
     }
 
     private function sigmoid(float $t): float

src/dto/Color.php

@@ -12,7 +12,7 @@ class Color
     )
     {
         if (is_string($red)) {
-            list($this->red, $this->green, $this->blue) = sscanf($this->red, "#%02x%02x%02x");
+            [$this->red, $this->green, $this->blue] = sscanf($this->red, "#%02x%02x%02x");
         }
     }
 
@@ -31,4 +31,19 @@ class Color
             alpha: $this->alpha + ($color->alpha - $this->alpha) * $range,
         );
     }
+
+    public function brighten(float $amount): Color
+    {
+        return new Color(
+            red: $this->clamp($this->red + $amount, 0, 255),
+            green: $this->clamp($this->green + $amount, 0, 255),
+            blue: $this->clamp($this->blue + $amount, 0, 255),
+            alpha: $this->alpha,
+        );
+    }
+
+    private function clamp(int $current, int $min, int $max): int
+    {
+        return max($min, min($max, $current));
+    }
 }

src/index.php

@@ -9,6 +9,8 @@ include "MapGenerator.php";
 $renderer = new Renderer();
 $map = new MapGenerator($renderer, $_GET['seed'], (int)$_GET['width'], (int)$_GET['height']);
 
+$start = microtime(true);
 echo $renderer->render('map.html.twig', [
     'map' => $map,
 ]);
+echo 'time: ' . microtime(true) - $start;