Unify splash screen rendering

[smallmain]

Cocos Creator version

3.8.2

System information

MacOS

Issue description

wechatgame:

const defaultRatio = 200 / image.height;
const widthRatio = image.width / canvas.width * 1.35 * defaultRatio * displayRatio;
const heightRatio = image.height / canvas.height * 1.35 * defaultRatio * displayRatio;
const heightOffset = 1/6; // canvas:(-1,1) -> (button, top); heightOffset = (5/12) * (-2) + 1 = 1/6
const vertices = new Float32Array([
   widthRatio, heightOffset - heightRatio, 1.0, 1.0,
   widthRatio, heightOffset + heightRatio, 1.0, 0.0,
   -widthRatio, heightOffset - heightRatio, 0.0, 1.0,
   -widthRatio, heightOffset + heightRatio, 0.0, 0.0,
]);
gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);
gl.bufferData(gl.ARRAY_BUFFER, vertices, gl.STATIC_DRAW);

splash-screen.ts:

this.logoYTrans = 1 / 6 + 2.5 / 6;// Percent

I reproduce the rendering position and size of the logo on the start scene because we may need to make a special transition effect.

However, the rendering codes of different platforms are different and cannot be easily reproduced.

so:
Can you provide an example to help us reproduce splash screen rendering? Or unify the rendering code so that we can reproduce it more easily.

Relevant error log output

No response

Steps to reproduce

.

Minimal reproduction project

No response