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weapp-adapter

weapp-adapter of Wechat Tiny Game in ES6

WeChat game official has provided developers with weapp-adapter to allow developers to modify and make it support by themselves for which libraries they use to develop their game on WeChat platform. (weapp-adapter is at: https://mp.weixin.qq.com/debug/wxagame/dev/tutorial/base/adapter.html )

This project is modified version of weapp-adapter in ES6.

Improvement

  • Modify HTMLImageElement / HTMLCanvasElement / HTMLVideoElement to make it be able to be detected by instanceof
  • Export TouchEvent globally, and fixed circular dependencies
  • Added global pseudo-MouseEvent as developer tool needs it
  • Added global pseudo-WebGLRenderingContext
  • Make XMLHttpRequest inherits from EventTarget
  • Added document.createElementNS
  • Added EventTarget property and style to canvas
  • Added clientWidth and clientHeight to canvas
  • Support of PixiJS、ThreeJS、Phaser are in progress (WIP)

WeChat game library's known issues

Only listed here for serious issue, and difficult to work around.

  • WebGL on Android doesn't support OES_vertex_array_object extension. But instead of returning null/undefined when calling gl.getExtension("OES_vertex_array_object"), it returns non-null object. This causes the engine to make mistakes when decide to use OESVao or not.
  • The size of gl.createFramebuffer/gl.createTexture is incorrect on Android with the resolution of canvas.
  • WebGL on Android for stencil has problem ( gl.getContextAttributes().stencil !== true ). This causes PixiJS to not work properly with WebGL mode. Anyway, you can work around in uncleanly way to make it runs but functionality related to Filter, Mask, Graphics won't work. Some of the features that work with ThreeJS also doesn't work.
  • When getting information from WebGLRenderingContext（antialias、preserveDrawingBuffer、stencil, its returning type should be boolean (true/false), but instead returned as integer(1/0). This will cause problem when using with strict equality comparison ===.
  • Unable to get correct WebGL version. This leads to the use of old version for ThreeJS (Android error of `Cannot read '1' of null). As well as on iOS, but doesn't affect ThreeJS for now.

Instructions

Put all files as found under src directory into js/libs/weapp-adapter directory.

Whenever you need to import the code, use the following.

import './js/libs/weapp-adapter/index.js'

Note

  • According to ES6 syntax, you can just use import './js/libs/weapp-adapter/ (without index.js). But for actual test on real device, sometimes it failed.
  • This project doesn't include with webpack bundling script. It is recommended to directly reference the source code, then let WeChat game engine (IDE) compile, compress, and convert automatically for you. In fact, the size of code package is smaller compared to if we do it ourselves.