File size: 3,893 Bytes
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import { arrayNeedsUint32 } from '../../utils.js';
function WebGLGeometries( gl, attributes, info, bindingStates ) {
const geometries = {};
const wireframeAttributes = new WeakMap();
function onGeometryDispose( event ) {
const geometry = event.target;
if ( geometry.index !== null ) {
attributes.remove( geometry.index );
}
for ( const name in geometry.attributes ) {
attributes.remove( geometry.attributes[ name ] );
}
for ( const name in geometry.morphAttributes ) {
const array = geometry.morphAttributes[ name ];
for ( let i = 0, l = array.length; i < l; i ++ ) {
attributes.remove( array[ i ] );
}
}
geometry.removeEventListener( 'dispose', onGeometryDispose );
delete geometries[ geometry.id ];
const attribute = wireframeAttributes.get( geometry );
if ( attribute ) {
attributes.remove( attribute );
wireframeAttributes.delete( geometry );
}
bindingStates.releaseStatesOfGeometry( geometry );
if ( geometry.isInstancedBufferGeometry === true ) {
delete geometry._maxInstanceCount;
}
//
info.memory.geometries --;
}
function get( object, geometry ) {
if ( geometries[ geometry.id ] === true ) return geometry;
geometry.addEventListener( 'dispose', onGeometryDispose );
geometries[ geometry.id ] = true;
info.memory.geometries ++;
return geometry;
}
function update( geometry ) {
const geometryAttributes = geometry.attributes;
// Updating index buffer in VAO now. See WebGLBindingStates.
for ( const name in geometryAttributes ) {
attributes.update( geometryAttributes[ name ], gl.ARRAY_BUFFER );
}
// morph targets
const morphAttributes = geometry.morphAttributes;
for ( const name in morphAttributes ) {
const array = morphAttributes[ name ];
for ( let i = 0, l = array.length; i < l; i ++ ) {
attributes.update( array[ i ], gl.ARRAY_BUFFER );
}
}
}
function updateWireframeAttribute( geometry ) {
const indices = [];
const geometryIndex = geometry.index;
const geometryPosition = geometry.attributes.position;
let version = 0;
if ( geometryIndex !== null ) {
const array = geometryIndex.array;
version = geometryIndex.version;
for ( let i = 0, l = array.length; i < l; i += 3 ) {
const a = array[ i + 0 ];
const b = array[ i + 1 ];
const c = array[ i + 2 ];
indices.push( a, b, b, c, c, a );
}
} else if ( geometryPosition !== undefined ) {
const array = geometryPosition.array;
version = geometryPosition.version;
for ( let i = 0, l = ( array.length / 3 ) - 1; i < l; i += 3 ) {
const a = i + 0;
const b = i + 1;
const c = i + 2;
indices.push( a, b, b, c, c, a );
}
} else {
return;
}
const attribute = new ( arrayNeedsUint32( indices ) ? Uint32BufferAttribute : Uint16BufferAttribute )( indices, 1 );
attribute.version = version;
// Updating index buffer in VAO now. See WebGLBindingStates
//
const previousAttribute = wireframeAttributes.get( geometry );
if ( previousAttribute ) attributes.remove( previousAttribute );
//
wireframeAttributes.set( geometry, attribute );
}
function getWireframeAttribute( geometry ) {
const currentAttribute = wireframeAttributes.get( geometry );
if ( currentAttribute ) {
const geometryIndex = geometry.index;
if ( geometryIndex !== null ) {
// if the attribute is obsolete, create a new one
if ( currentAttribute.version < geometryIndex.version ) {
updateWireframeAttribute( geometry );
}
}
} else {
updateWireframeAttribute( geometry );
}
return wireframeAttributes.get( geometry );
}
return {
get: get,
update: update,
getWireframeAttribute: getWireframeAttribute
};
}
export { WebGLGeometries };
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