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c=t.format;w(n.webgl_depth_texture||!("depth"===c||"depth stencil"===c),"you must enable the WEBGL_depth_texture extension in order to use depth/stencil textures."),w.parameter(c,h,"invalid texture format");var l=e.internalformat=h[c];e.format=S[l],c in p&&!("type"in t)&&(e.type=p[c]),c in b&&(e.compressed=!0),s=!0;}!u&&s?e.channels=er[e.format]:u&&!s?e.channels!==et[e.format]&&(e.format=e.internalformat=et[e.channels]):s&&u&&w(e.channels===er[e.format],"number of channels inconsistent with specified format");}}function D(e){r.pixelStorei(37440,e.flipY),r.pixelStorei(37441,e.premultiplyAlpha),r.pixelStorei(37443,e.colorSpace),r.pixelStorei(3317,e.unpackAlignment);}function j(){O.call(this),this.xOffset=0,this.yOffset=0,this.data=null,this.needsFree=!1,this.element=null,this.needsCopy=!1;}function C(t,r){var n=null;if(eb(r)?n=r:r&&(w.type(r,"object","invalid pixel data type"),T(t,r),"x"in r&&(t.xOffset=0|r.x),"y"in r&&(t.yOffset=0|r.y),eb(r.data)&&(n=r.data)),w(!t.compressed||n 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