playcanvas/build/playcanvas/src/scene/skybox/sky-mesh.js

PlayCanvas WebGL game engine

import { SEMANTIC_POSITION, SHADERLANGUAGE_WGSL, SHADERLANGUAGE_GLSL, CULLFACE_FRONT } from '../../platform/graphics/constants.js';
import { SKYTYPE_INFINITE, LAYERID_SKYBOX } from '../constants.js';
import { ShaderMaterial } from '../materials/shader-material.js';
import { MeshInstance } from '../mesh-instance.js';
import { ChunkUtils } from '../shader-lib/chunk-utils.js';
import { SkyGeometry } from './sky-geometry.js';
import { ShaderChunks } from '../shader-lib/shader-chunks.js';

class SkyMesh {
		constructor(device, scene, node, texture, type){
				this.meshInstance = null;
				this._depthWrite = false;
				const material = new ShaderMaterial({
						uniqueName: 'SkyMaterial',
						vertexGLSL: ShaderChunks.get(device, SHADERLANGUAGE_GLSL).get('skyboxVS'),
						fragmentGLSL: ShaderChunks.get(device, SHADERLANGUAGE_GLSL).get('skyboxPS'),
						vertexWGSL: ShaderChunks.get(device, SHADERLANGUAGE_WGSL).get('skyboxVS'),
						fragmentWGSL: ShaderChunks.get(device, SHADERLANGUAGE_WGSL).get('skyboxPS'),
						attributes: {
								aPosition: SEMANTIC_POSITION
						}
				});
				material.setDefine('{SKYBOX_DECODE_FNC}', ChunkUtils.decodeFunc(texture.encoding));
				if (type !== SKYTYPE_INFINITE) material.setDefine('SKYMESH', '');
				if (texture.cubemap) material.setDefine('SKY_CUBEMAP', '');
				material.setParameter('skyboxHighlightMultiplier', scene.skyboxHighlightMultiplier);
				if (texture.cubemap) {
						material.setParameter('texture_cubeMap', texture);
				} else {
						material.setParameter('texture_envAtlas', texture);
						material.setParameter('mipLevel', scene.skyboxMip);
				}
				material.cull = CULLFACE_FRONT;
				material.depthWrite = this._depthWrite;
				const skyLayer = scene.layers.getLayerById(LAYERID_SKYBOX);
				if (skyLayer) {
						const mesh = SkyGeometry.create(device, type);
						const meshInstance = new MeshInstance(mesh, material, node);
						this.meshInstance = meshInstance;
						meshInstance.cull = false;
						meshInstance.pick = false;
						skyLayer.addMeshInstances([
								meshInstance
						]);
						this.skyLayer = skyLayer;
				}
		}
		destroy() {
				if (this.meshInstance) {
						if (this.skyLayer) {
								this.skyLayer.removeMeshInstances([
										this.meshInstance
								]);
						}
						this.meshInstance.destroy();
						this.meshInstance = null;
				}
		}
		set depthWrite(value) {
				this._depthWrite = value;
				if (this.meshInstance) {
						this.meshInstance.material.depthWrite = value;
				}
		}
		get depthWrite() {
				return this._depthWrite;
		}
}

export { SkyMesh };