@phaserjs/phaser/renderer/webgl1/shaders/CreateAttributes.js

Phaser 4

import * as GL_CONST from "../GL_CONST";
import { gl } from "../GL";
export function CreateAttributes(program, attribs) {
  const attributes = new Map();
  const defaultSettings = {
    size: 1,
    type: GL_CONST.FLOAT,
    normalized: false,
    stride: 0
  };
  let offset = 0;
  for (const [name, entry] of Object.entries(attribs)) {
    const index = gl.getAttribLocation(program, name);
    if (index !== -1) {
      gl.enableVertexAttribArray(index);
      const {
        size = defaultSettings.size,
        type = defaultSettings.type,
        normalized = defaultSettings.normalized,
        stride = defaultSettings.stride
      } = entry;
      attributes.set(name, { index, size, type, normalized, stride, offset });
      let typeSize = 4;
      if (type === GL_CONST.UNSIGNED_SHORT || type === GL_CONST.SHORT) {
        typeSize = 2;
      } else if (type === GL_CONST.UNSIGNED_BYTE || type === GL_CONST.BYTE) {
        typeSize = 1;
      }
      offset += size * typeSize;
    }
  }
  return attributes;
}