RenderTexture.resize fails on WebGL

[photonstorm]

Wow this one took me a good while to track down, but basically RenderTexture.resize is broken in WebGL.

The offending line is https://github.com/GoodBoyDigital/pixi.js/blob/master/src/pixi/textures/RenderTexture.js#L118

this.baseTexture._glTextures[gl.id] appears to be an empty object, and when that happens the bind fails and the texImage2D starts throwing console errors like they are going out of fashion.

This is easy to replicate. Just open Pixi example 11 and stick this on line 37:

renderTexture.resize(400, 300);

[photonstorm]

Sorry should have added, the error thrown is:

WebGL: INVALID_FRAMEBUFFER_OPERATION: clear: attachments do not have the same dimensions

But @GoodBoyDigital knew this anyway from our IM chat :)

[lock]

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