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import BoxGeometry from "../Core/BoxGeometry.js";
import Cartesian3 from "../Core/Cartesian3.js";
import Check from "../Core/Check.js";
import defined from "../Core/defined.js";
import destroyObject from "../Core/destroyObject.js";
import DeveloperError from "../Core/DeveloperError.js";
import GeometryPipeline from "../Core/GeometryPipeline.js";
import Matrix4 from "../Core/Matrix4.js";
import VertexFormat from "../Core/VertexFormat.js";
import BufferUsage from "../Renderer/BufferUsage.js";
import CubeMap from "../Renderer/CubeMap.js";
import DrawCommand from "../Renderer/DrawCommand.js";
import loadCubeMap from "../Renderer/loadCubeMap.js";
import RenderState from "../Renderer/RenderState.js";
import ShaderProgram from "../Renderer/ShaderProgram.js";
import ShaderSource from "../Renderer/ShaderSource.js";
import VertexArray from "../Renderer/VertexArray.js";
import SkyBoxFS from "../Shaders/SkyBoxFS.js";
import SkyBoxVS from "../Shaders/SkyBoxVS.js";
import BlendingState from "./BlendingState.js";
import SceneMode from "./SceneMode.js";
/**
* A sky box around the scene to draw stars. The sky box is defined using the True Equator Mean Equinox (TEME) axes.
* <p>
* This is only supported in 3D. The sky box is faded out when morphing to 2D or Columbus view. The size of
* the sky box must not exceed {@link Scene#maximumCubeMapSize}.
* </p>
*
* @alias SkyBox
* @constructor
*
* @param {object} options Object with the following properties:
* @param {object} [options.sources] The source URL or <code>Image</code> object for each of the six cube map faces. See the example below.
* @param {boolean} [options.show=true] Determines if this primitive will be shown.
*
*
* @example
* scene.skyBox = new Cesium.SkyBox({
* sources : {
* positiveX : 'skybox_px.png',
* negativeX : 'skybox_nx.png',
* positiveY : 'skybox_py.png',
* negativeY : 'skybox_ny.png',
* positiveZ : 'skybox_pz.png',
* negativeZ : 'skybox_nz.png'
* }
* });
*
* @see Scene#skyBox
* @see Transforms.computeTemeToPseudoFixedMatrix
*/
function SkyBox(options) {
/**
* The sources used to create the cube map faces: an object
* with <code>positiveX</code>, <code>negativeX</code>, <code>positiveY</code>,
* <code>negativeY</code>, <code>positiveZ</code>, and <code>negativeZ</code> properties.
* These can be either URLs or <code>Image</code> objects.
*
* @type {object}
* @default undefined
*/
this.sources = options.sources;
this._sources = undefined;
/**
* Determines if the sky box will be shown.
*
* @type {boolean}
* @default true
*/
this.show = options.show ?? true;
this._command = new DrawCommand({
modelMatrix: Matrix4.clone(Matrix4.IDENTITY),
owner: this,
});
this._cubeMap = undefined;
this._attributeLocations = undefined;
this._useHdr = undefined;
this._hasError = false;
this._error = undefined;
}
/**
* Called when {@link Viewer} or {@link CesiumWidget} render the scene to
* get the draw commands needed to render this primitive.
* <p>
* Do not call this function directly. This is documented just to
* list the exceptions that may be propagated when the scene is rendered:
* </p>
*
* @exception {DeveloperError} this.sources is required and must have positiveX, negativeX, positiveY, negativeY, positiveZ, and negativeZ properties.
* @exception {DeveloperError} this.sources properties must all be the same type.
*/
SkyBox.prototype.update = function (frameState, useHdr) {
const that = this;
const { mode, passes, context } = frameState;
if (!this.show) {
return undefined;
}
if (mode !== SceneMode.SCENE3D && mode !== SceneMode.MORPHING) {
return undefined;
}
// The sky box is only rendered during the render pass; it is not pickable, it doesn't cast shadows, etc.
if (!passes.render) {
return undefined;
}
// Throw any errors that had previously occurred asynchronously so they aren't
// ignored when running. See https://github.com/CesiumGS/cesium/pull/12307
if (this._hasError) {
const error = this._error;
this._hasError = false;
this._error = undefined;
throw error;
}
if (this._sources !== this.sources) {
this._sources = this.sources;
const sources = this.sources;
//>>includeStart('debug', pragmas.debug);
Check.defined("this.sources", sources);
if (
Object.values(CubeMap.FaceName).some(
(faceName) => !defined(sources[faceName]),
)
) {
throw new DeveloperError(
"this.sources must have positiveX, negativeX, positiveY, negativeY, positiveZ, and negativeZ properties.",
);
}
const sourceType = typeof sources.positiveX;
if (
Object.values(CubeMap.FaceName).some(
(faceName) => typeof sources[faceName] !== sourceType,
)
) {
throw new DeveloperError(
"this.sources properties must all be the same type.",
);
}
//>>includeEnd('debug');
if (typeof sources.positiveX === "string") {
// Given urls for cube-map images. Load them.
loadCubeMap(context, this._sources)
.then(function (cubeMap) {
that._cubeMap = that._cubeMap && that._cubeMap.destroy();
that._cubeMap = cubeMap;
})
.catch((error) => {
// Defer throwing the error until the next call to update to prevent
// test from failing in `afterAll` if this is rejected after the test
// using the Skybox ends. See https://github.com/CesiumGS/cesium/pull/12307
this._hasError = true;
this._error = error;
});
} else {
this._cubeMap = this._cubeMap && this._cubeMap.destroy();
this._cubeMap = new CubeMap({
context: context,
source: sources,
});
}
}
const command = this._command;
if (!defined(command.vertexArray)) {
command.uniformMap = {
u_cubeMap: function () {
return that._cubeMap;
},
};
const geometry = BoxGeometry.createGeometry(
BoxGeometry.fromDimensions({
dimensions: new Cartesian3(2.0, 2.0, 2.0),
vertexFormat: VertexFormat.POSITION_ONLY,
}),
);
const attributeLocations = (this._attributeLocations =
GeometryPipeline.createAttributeLocations(geometry));
command.vertexArray = VertexArray.fromGeometry({
context: context,
geometry: geometry,
attributeLocations: attributeLocations,
bufferUsage: BufferUsage.STATIC_DRAW,
});
command.renderState = RenderState.fromCache({
blending: BlendingState.ALPHA_BLEND,
});
}
if (!defined(command.shaderProgram) || this._useHdr !== useHdr) {
const fs = new ShaderSource({
defines: [useHdr ? "HDR" : ""],
sources: [SkyBoxFS],
});
command.shaderProgram = ShaderProgram.fromCache({
context: context,
vertexShaderSource: SkyBoxVS,
fragmentShaderSource: fs,
attributeLocations: this._attributeLocations,
});
this._useHdr = useHdr;
}
if (!defined(this._cubeMap)) {
return undefined;
}
return command;
};
/**
* Returns true if this object was destroyed; otherwise, false.
* <br /><br />
* If this object was destroyed, it should not be used; calling any function other than
* <code>isDestroyed</code> will result in a {@link DeveloperError} exception.
*
* @returns {boolean} <code>true</code> if this object was destroyed; otherwise, <code>false</code>.
*
* @see SkyBox#destroy
*/
SkyBox.prototype.isDestroyed = function () {
return false;
};
/**
* Destroys the WebGL resources held by this object. Destroying an object allows for deterministic
* release of WebGL resources, instead of relying on the garbage collector to destroy this object.
* <br /><br />
* Once an object is destroyed, it should not be used; calling any function other than
* <code>isDestroyed</code> will result in a {@link DeveloperError} exception. Therefore,
* assign the return value (<code>undefined</code>) to the object as done in the example.
*
* @exception {DeveloperError} This object was destroyed, i.e., destroy() was called.
*
*
* @example
* skyBox = skyBox && skyBox.destroy();
*
* @see SkyBox#isDestroyed
*/
SkyBox.prototype.destroy = function () {
const command = this._command;
command.vertexArray = command.vertexArray && command.vertexArray.destroy();
command.shaderProgram =
command.shaderProgram && command.shaderProgram.destroy();
this._cubeMap = this._cubeMap && this._cubeMap.destroy();
return destroyObject(this);
};
function getDefaultSkyBoxUrl(suffix) {
return buildModuleUrl(`Assets/Textures/SkyBox/tycho2t3_80_${suffix}.jpg`);
}
/**
* Creates a skybox instance with the default starmap for the Earth.
* @return {SkyBox} The default skybox for the Earth
*
* @example
* viewer.scene.skyBox = Cesium.SkyBox.createEarthSkyBox();
*/
SkyBox.createEarthSkyBox = function () {
return new SkyBox({
sources: {
positiveX: getDefaultSkyBoxUrl("px"),
negativeX: getDefaultSkyBoxUrl("mx"),
positiveY: getDefaultSkyBoxUrl("py"),
negativeY: getDefaultSkyBoxUrl("my"),
positiveZ: getDefaultSkyBoxUrl("pz"),
negativeZ: getDefaultSkyBoxUrl("mz"),
},
});
};
export default SkyBox;
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