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mtime;�FI" 2013-07-03T11:02:49+02:00;�FI" length;�FiM I" digest;�F"%905458e8644fb6506c2cc51ba811d9b1I" source;�FI"M /*global define*/
define([
'../Core/BoxTessellator',
'../Core/Cartesian3',
'../Core/destroyObject',
'../Core/DeveloperError',
'../Core/Matrix4',
'../Core/MeshFilters',
'../Core/PrimitiveType',
'../Renderer/loadCubeMap',
'../Renderer/BufferUsage',
'../Renderer/DrawCommand',
'../Renderer/BlendingState',
'../Scene/SceneMode',
'../Shaders/SkyBoxVS',
'../Shaders/SkyBoxFS'
], function(
BoxTessellator,
Cartesian3,
destroyObject,
DeveloperError,
Matrix4,
MeshFilters,
PrimitiveType,
loadCubeMap,
BufferUsage,
DrawCommand,
BlendingState,
SceneMode,
SkyBoxVS,
SkyBoxFS) {
"use strict";
/**
* 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.
* </p>
*
* @alias SkyBox
* @constructor
*
* @param {Object} sources The source URL or <code>Image</code> object for each of the six cube map faces. See the example below.
*
* @exception {DeveloperError} sources is required and must have positiveX, negativeX, positiveY, negativeY, positiveZ, and negativeZ properties.
* @exception {DeveloperError} sources properties must all be the same type.
*
* @example
* scene.skyBox = new SkyBox({
* 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
*/
var SkyBox = function(sources) {
if ((typeof sources === 'undefined') ||
(typeof sources.positiveX === 'undefined') ||
(typeof sources.negativeX === 'undefined') ||
(typeof sources.positiveY === 'undefined') ||
(typeof sources.negativeY === 'undefined') ||
(typeof sources.positiveZ === 'undefined') ||
(typeof sources.negativeZ === 'undefined')) {
throw new DeveloperError('sources is required and must have positiveX, negativeX, positiveY, negativeY, positiveZ, and negativeZ properties.');
}
if ((typeof sources.positiveX !== typeof sources.negativeX) ||
(typeof sources.positiveX !== typeof sources.positiveY) ||
(typeof sources.positiveX !== typeof sources.negativeY) ||
(typeof sources.positiveX !== typeof sources.positiveZ) ||
(typeof sources.positiveX !== typeof sources.negativeZ)) {
throw new DeveloperError('sources properties must all be the same type.');
}
this._command = new DrawCommand();
this._cubeMap = undefined;
this._sources = sources;
/**
* Determines if the sky box will be shown.
* <p>
* The default is <code>true</code>.
* </p>
*
* @type {Boolean}
* @default true
*/
this.show = true;
};
/**
* Returns 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 are either URLs or <code>Image</code> objects, depending on how the sky box
* was constructed.
*
* @memberof SkyBox
*
* @return {Object} The sources used to create the cube map faces.
*/
SkyBox.prototype.getSources = function() {
return this._sources;
};
/**
* @private
*/
SkyBox.prototype.update = function(context, frameState) {
if (!this.show) {
return undefined;
}
if ((frameState.mode !== SceneMode.SCENE3D) &&
(frameState.mode !== SceneMode.MORPHING)) {
return undefined;
}
// The sky box is only rendered during the color pass; it is not pickable, it doesn't cast shadows, etc.
if (!frameState.passes.color) {
return undefined;
}
var command = this._command;
if (typeof command.vertexArray === 'undefined') {
var sources = this._sources;
var that = this;
if (typeof sources.positiveX === 'string') {
// Given urls for cube-map images. Load them.
loadCubeMap(context, this._sources).then(function(cubeMap) {
that._cubeMap = cubeMap;
});
} else {
this._cubeMap = context.createCubeMap({
source : sources
});
}
command.uniformMap = {
u_cubeMap: function() {
return that._cubeMap;
}
};
var mesh = BoxTessellator.compute({
dimensions : new Cartesian3(2.0, 2.0, 2.0)
});
var attributeIndices = MeshFilters.createAttributeIndices(mesh);
command.primitiveType = PrimitiveType.TRIANGLES;
command.modelMatrix = Matrix4.IDENTITY.clone();
command.vertexArray = context.createVertexArrayFromMesh({
mesh: mesh,
attributeIndices: attributeIndices,
bufferUsage: BufferUsage.STATIC_DRAW
});
command.shaderProgram = context.getShaderCache().getShaderProgram(SkyBoxVS, SkyBoxFS, attributeIndices);
command.renderState = context.createRenderState({
blending : BlendingState.ALPHA_BLEND
});
}
if (typeof this._cubeMap === 'undefined') {
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.
*
* @memberof SkyBox
*
* @return {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.
*
* @memberof SkyBox
*
* @return {undefined}
*
* @exception {DeveloperError} This object was destroyed, i.e., destroy() was called.
*
* @see SkyBox#isDestroyed
*
* @example
* skyBox = skyBox && skyBox.destroy();
*/
SkyBox.prototype.destroy = function() {
var command = this._command;
command.vertexArray = command.vertexArray && command.vertexArray.destroy();
command.shaderProgram = command.shaderProgram && command.shaderProgram.release();
this._cubeMap = this._cubeMap && this._cubeMap.destroy();
return destroyObject(this);
};
return SkyBox;
});
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