awayjs-display/lib/materials/shadowmappers/NearDirectionalShadowMapper.ts

AwayJS displaylist classes

import Camera						from "../../display/Camera";
import DirectionalShadowMapper		from "../../materials/shadowmappers/DirectionalShadowMapper";

class NearDirectionalShadowMapper extends DirectionalShadowMapper
{
	private _coverageRatio:number;

	constructor(coverageRatio:number = .5)
	{
		super();

		this.coverageRatio = coverageRatio;
	}

	/**
	 * A value between 0 and 1 to indicate the ratio of the view frustum that needs to be covered by the shadow map.
	 */
	public get coverageRatio():number
	{
		return this._coverageRatio;
	}

	public set coverageRatio(value:number)
	{
		if (value > 1)
			value = 1; else if (value < 0)
			value = 0;

		this._coverageRatio = value;
	}

	public pUpdateDepthProjection(camera:Camera)
	{
		var corners:Array<number> = camera.projection.frustumCorners;

		for (var i:number /*int*/ = 0; i < 12; ++i) {
			var v:number = corners[i];
			this._pLocalFrustum[i] = v;
			this._pLocalFrustum[i + 12] = v + (corners[i + 12] - v)*this._coverageRatio;
		}

		this.pUpdateProjectionFromFrustumCorners(camera, this._pLocalFrustum, this._pMatrix);
		this._pOverallDepthProjection.matrix = this._pMatrix;
	}
}

export default NearDirectionalShadowMapper;