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

Open-source WebGL/WebGPU 3D engine for the web

import { CULLFACE_FRONT, SEMANTIC_POSITION, SHADERLANGUAGE_GLSL, SHADERLANGUAGE_WGSL } from "../../platform/graphics/constants.js";
import { LAYERID_SKYBOX, SKYTYPE_INFINITE } 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 {
	meshInstance = null;
	_depthWrite = false;
	constructor(device, scene, node, texture, type) {
		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
};