feat: add chunked grass and organize environment systems

src/world/grass/grassShaders.ts

@@ -0,0 +1,48 @@
+export const grassVertexShader = /* glsl */ `
+  attribute vec3 aColor;
+  attribute vec3 aBladeBase;
+  attribute float aHeightFactor;
+  attribute float aWindPhase;
+
+  varying vec3 vColor;
+
+  uniform float uTime;
+  uniform float uWindDirection;
+  uniform float uWindSpeed;
+  uniform float uWindStrength;
+  uniform float uWindNoiseScale;
+  uniform float uBendStrength;
+
+  void main() {
+    vec3 transformed = position;
+    float topFactor = aHeightFactor * aHeightFactor;
+    vec2 windDirection = normalize(vec2(cos(uWindDirection), sin(uWindDirection)));
+
+    float primaryWind = sin(
+      uTime * max(uWindSpeed, 0.05) +
+      aWindPhase +
+      aBladeBase.x * uWindNoiseScale +
+      aBladeBase.z * uWindNoiseScale
+    );
+    float secondaryWind = sin(
+      uTime * max(uWindSpeed, 0.05) * 1.73 +
+      aWindPhase * 0.71 +
+      aBladeBase.x * uWindNoiseScale * 0.53 -
+      aBladeBase.z * uWindNoiseScale * 0.89
+    ) * 0.35;
+
+    float bend = (primaryWind + secondaryWind) * uWindStrength * uBendStrength * topFactor;
+    transformed.xz += windDirection * bend;
+
+    vColor = aColor;
+    gl_Position = projectionMatrix * modelViewMatrix * vec4(transformed, 1.0);
+  }
+`;
+
+export const grassFragmentShader = /* glsl */ `
+  varying vec3 vColor;
+
+  void main() {
+    gl_FragColor = vec4(vColor, 1.0);
+  }
+`;