Improve color handling approach

src/helper/code-for-color-access.ts

@@ -0,0 +1,13 @@
+import { vec3, vec4 } from 'gl-matrix';
+import { colorToString } from './color-to-string';
+
+/**
+ * @internal
+ */
+export const codeForColorAccess = (color: vec3 | vec4 | number): string => {
+  if (color instanceof Array || color instanceof Float32Array) {
+    return colorToString(color);
+  }
+
+  return `readFromPalette(${color})`;
+};

src/helper/color-to-string.ts

@@ -0,0 +1,7 @@
+import { vec3, vec4 } from 'gl-matrix';
+
+/**
+ * @internal
+ */
+export const colorToString = (v: vec3 | vec4): string =>
+  `vec4(${v[0]}, ${v[1]}, ${v[2]}, ${v.length > 3 ? v[3] : 1})`;