File size: 3,372 Bytes
b797337 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 | import { Matrix3 } from '../../math/Matrix3.js';
import { Plane } from '../../math/Plane.js';
function WebGLClipping( properties ) {
const scope = this;
let globalState = null,
numGlobalPlanes = 0,
localClippingEnabled = false,
renderingShadows = false;
const plane = new Plane(),
viewNormalMatrix = new Matrix3(),
uniform = { value: null, needsUpdate: false };
this.uniform = uniform;
this.numPlanes = 0;
this.numIntersection = 0;
this.init = function ( planes, enableLocalClipping ) {
const enabled =
planes.length !== 0 ||
enableLocalClipping ||
// enable state of previous frame - the clipping code has to
// run another frame in order to reset the state:
numGlobalPlanes !== 0 ||
localClippingEnabled;
localClippingEnabled = enableLocalClipping;
numGlobalPlanes = planes.length;
return enabled;
};
this.beginShadows = function () {
renderingShadows = true;
projectPlanes( null );
};
this.endShadows = function () {
renderingShadows = false;
};
this.setGlobalState = function ( planes, camera ) {
globalState = projectPlanes( planes, camera, 0 );
};
this.setState = function ( material, camera, useCache ) {
const planes = material.clippingPlanes,
clipIntersection = material.clipIntersection,
clipShadows = material.clipShadows;
const materialProperties = properties.get( material );
if ( ! localClippingEnabled || planes === null || planes.length === 0 || renderingShadows && ! clipShadows ) {
// there's no local clipping
if ( renderingShadows ) {
// there's no global clipping
projectPlanes( null );
} else {
resetGlobalState();
}
} else {
const nGlobal = renderingShadows ? 0 : numGlobalPlanes,
lGlobal = nGlobal * 4;
let dstArray = materialProperties.clippingState || null;
uniform.value = dstArray; // ensure unique state
dstArray = projectPlanes( planes, camera, lGlobal, useCache );
for ( let i = 0; i !== lGlobal; ++ i ) {
dstArray[ i ] = globalState[ i ];
}
materialProperties.clippingState = dstArray;
this.numIntersection = clipIntersection ? this.numPlanes : 0;
this.numPlanes += nGlobal;
}
};
function resetGlobalState() {
if ( uniform.value !== globalState ) {
uniform.value = globalState;
uniform.needsUpdate = numGlobalPlanes > 0;
}
scope.numPlanes = numGlobalPlanes;
scope.numIntersection = 0;
}
function projectPlanes( planes, camera, dstOffset, skipTransform ) {
const nPlanes = planes !== null ? planes.length : 0;
let dstArray = null;
if ( nPlanes !== 0 ) {
dstArray = uniform.value;
if ( skipTransform !== true || dstArray === null ) {
const flatSize = dstOffset + nPlanes * 4,
viewMatrix = camera.matrixWorldInverse;
viewNormalMatrix.getNormalMatrix( viewMatrix );
if ( dstArray === null || dstArray.length < flatSize ) {
dstArray = new Float32Array( flatSize );
}
for ( let i = 0, i4 = dstOffset; i !== nPlanes; ++ i, i4 += 4 ) {
plane.copy( planes[ i ] ).applyMatrix4( viewMatrix, viewNormalMatrix );
plane.normal.toArray( dstArray, i4 );
dstArray[ i4 + 3 ] = plane.constant;
}
}
uniform.value = dstArray;
uniform.needsUpdate = true;
}
scope.numPlanes = nPlanes;
scope.numIntersection = 0;
return dstArray;
}
}
export { WebGLClipping };
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