function destroyContext()

in seriously.js [1239:1347]
76 lines of code
19 McCabe index (conditional complexity)

		function destroyContext(event) {
			// either webglcontextlost or primary target node has been destroyed
			var i, node;

			/*
			todo: once multiple shared webgl resources are supported,
			see if we can switch context to another existing one and
			rebuild immediately
			*/

			if (event) {
				Seriously.logger.warn('WebGL context lost');
				/*
				todo: if too many webglcontextlost events fired in too short a time,
				don't preventDefault
				*/
				event.preventDefault();
			}

			//don't draw anymore until context is restored
			if (rafId) {
				cancelAnimFrame(rafId);
				rafId = 0;
			}

			if (glCanvas) {
				glCanvas.removeEventListener('webglcontextlost', destroyContext, false);
			}

			for (i = 0; i < effects.length; i++) {
				node = effects[i];
				node.gl = null;
				node.initialized = false;
				node.baseShader = null;
				node.model = null;
				node.frameBuffer = null;
				node.texture = null;
				if (node.shader && node.shader.destroy) {
					node.shader.destroy();
				}
				node.shaderDirty = true;
				node.shader = null;
				if (node.effect.lostContext) {
					node.effect.lostContext.call(node);
				}

				/*
				todo: do we need to set nodes to uready?
				if so, make sure nodes never get set to ready unless gl exists
				and make sure to set ready again when context is restored
				*/

				if (event) {
					node.emit('webglcontextlost');
				}
			}

			for (i = 0; i < sources.length; i++) {
				node = sources[i];
				//node.setUnready();
				node.texture = null;
				node.initialized = false;
				node.allowRefresh = false;
				if (event) {
					node.emit('webglcontextlost');
				}
			}

			for (i = 0; i < transforms.length; i++) {
				node = transforms[i];
				node.frameBuffer = null;
				node.texture = null;
				if (event) {
					node.emit('webglcontextlost');
				}
			}

			for (i = 0; i < targets.length; i++) {
				node = targets[i];
				node.model = false;
				node.frameBuffer = null;
				//texture?
				if (event) {
					node.emit('webglcontextlost');
				}
			}

			if (baseShader && baseShader.destroy) {
				baseShader.destroy();
			}

			//clean up rectangleModel
			if (gl) {
				gl.deleteBuffer(rectangleModel.vertex);
				gl.deleteBuffer(rectangleModel.texCoord);
				gl.deleteBuffer(rectangleModel.index);
			}

			if (rectangleModel) {
				delete rectangleModel.vertex;
				delete rectangleModel.texCoord;
				delete rectangleModel.index;
			}

			rectangleModel = null;
			baseShader = null;
			gl = null;
			glCanvas = null;
		}