class DirShadow

extends Shader

@:directlyUsed@:src({ @const var enable:Bool; @const var USE_ESM:Bool; @param var shadowPower:Float; @const var USE_PCF:Bool; @const var PCF_SAMPLES:Int; @param var pcfScale:Float; @param var shadowRes:Vec2; @param var shadowMap:Channel; @param var shadowProj:Mat3x4; @param var shadowBias:Float; var transformedPosition:Vec3; var shadow:Float; var dirShadow:Float; @param var poissonDisk:Array<Vec4,PCF_SAMPLES>; function rand(v:Float):Float { var dp = dot(vec4(v), vec4(12.9898, 78.233, 45.164, 94.673)); return fract(sin(dp) * 43758.5453); }; function fragment() { if (enable) { if (USE_PCF) { shadow = 1.0; var texelSize = 1.0 / shadowRes; var shadowPos = transformedPosition * shadowProj; var shadowUv = screenToUv(shadowPos.xy); var zMax = shadowPos.z.saturate(); var rot = rand(transformedPosition.x + transformedPosition.y + transformedPosition.z) * 3.14 * 2; var cosR = cos(rot); var sinR = sin(rot); var sampleStrength = 1.0 / PCF_SAMPLES; var offScale = texelSize * pcfScale; for (i in 0 ... PCF_SAMPLES) { var offset = poissonDisk[i].xy * offScale; offset = vec2(cosR * offset.x - sinR * offset.y, cosR * offset.y + sinR * offset.x); var depth = shadowMap.getLod(shadowUv + offset, 0); shadow -= (zMax - shadowBias > depth) ? sampleStrength : 0.0; }; } else if (USE_ESM) { var shadowPos = transformedPosition * shadowProj; var depth = shadowMap.get(screenToUv(shadowPos.xy)); var zMax = shadowPos.z.saturate(); var delta = (depth + shadowBias).min(zMax) - zMax; shadow = exp(shadowPower * delta).saturate(); } else { var shadowPos = transformedPosition * shadowProj; var shadowUv = screenToUv(shadowPos.xy); var depth = shadowMap.get(shadowUv.xy); shadow = shadowPos.z.saturate() - shadowBias > depth ? 0 : 1; }; }; dirShadow = shadow; }; })@:build(hxsl.Macros.buildShader())@:autoBuild(hxsl.Macros.buildShader())