How to set the default-Background-Color to White Color ?

[finscn]

now, the default-Background-Color is black.
How to let it be white ?

[finscn]

I'd know how to do it.

Generally, the background color of the web-page(in Browser) is white, I hope GLView's default background color can be set to white too.

[phoboslab]

Initially all pixels for the screen buffer are set to transparent black (0x00000000). We could clear to white, but this would break Apps that use getImageData(), because "empty" pixels are then no longer transparent but white.

We could also change the EAGLView's background color to white and make the EAGLLayer non-opaque

self.backgroundColor = [UIColor whiteColor];
eaglLayer.opaque = false;

However, a non-opaque EAGLLayer is supposed to have some performance penalty.

Setting the eaglLayer's backgroundColor to white has no effect whatsoever:

eaglLayer.backgroundColor = [UIColor whiteColor].CGColor;

So I'm not sure if you can have an opaque EAGLLayer with an non-black background color.

But I believe this is a non issue anyway. If you want your background to be white, just do a fillRect over the whole screen:

ctx.fillStyle = '#fff';
ctx.fillRect( 0, 0, canvas.width, canvas.height );