add 002

html/lib/shader.js

@@ -71,3 +71,37 @@ export class Shader {
     this.updateTime();
   }
 }
+
+export const colorUtils = `
+  vec3 rgb2hsv(vec3 c) {
+    vec4 K = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
+    vec4 p = mix(vec4(c.bg, K.wz), vec4(c.gb, K.xy), step(c.b, c.g));
+    vec4 q = mix(vec4(p.xyw, c.r), vec4(c.r, p.yzx), step(p.x, c.r));
+
+    float d = q.x - min(q.w, q.y);
+    float e = 1.0e-10;
+    return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x);
+  }
+
+  vec3 hsv2rgb(vec3 c) {
+    vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
+    vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
+    return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
+  }
+`;
+
+export const commonFrag = `
+  precision highp float;
+
+  uniform float uTime;
+  uniform float uSinTime;
+  uniform float uCosTime;
+`;
+
+export const commonVert = `
+  attribute vec4 aVertexPosition;
+  attribute vec2 aTextureCoord;
+  
+  uniform mat4 uModelViewMatrix;
+  uniform mat4 uProjectionMatrix;
+`;