5c5fcb7e06
For consistency with the way we export ol.DeviceOrientation.SUPPORTED and ol.Geolocation.SUPPORTED.
66 lines
1.2 KiB
JavaScript
66 lines
1.2 KiB
JavaScript
goog.provide('ol.webgl');
|
|
goog.provide('ol.webgl.WebGLContextEventType');
|
|
|
|
goog.require('goog.dom');
|
|
goog.require('goog.dom.TagName');
|
|
|
|
|
|
/**
|
|
* @const
|
|
* @private
|
|
* @type {Array.<string>}
|
|
*/
|
|
ol.webgl.CONTEXT_IDS_ = [
|
|
'experimental-webgl',
|
|
'webgl',
|
|
'webkit-3d',
|
|
'moz-webgl'
|
|
];
|
|
|
|
|
|
/**
|
|
* @enum {string}
|
|
*/
|
|
ol.webgl.WebGLContextEventType = {
|
|
LOST: 'webglcontextlost',
|
|
RESTORED: 'webglcontextrestored'
|
|
};
|
|
|
|
|
|
/**
|
|
* @param {Element} canvas Canvas.
|
|
* @param {Object=} opt_attributes Attributes.
|
|
* @return {WebGLRenderingContext} WebGL rendering context.
|
|
*/
|
|
ol.webgl.getContext = function(canvas, opt_attributes) {
|
|
var context, i, ii = ol.webgl.CONTEXT_IDS_.length;
|
|
for (i = 0; i < ii; ++i) {
|
|
try {
|
|
context = canvas.getContext(ol.webgl.CONTEXT_IDS_[i], opt_attributes);
|
|
if (!goog.isNull(context)) {
|
|
return context;
|
|
}
|
|
} catch (e) {
|
|
}
|
|
}
|
|
return null;
|
|
};
|
|
|
|
|
|
/**
|
|
* Is supported.
|
|
* @const
|
|
* @type {boolean}
|
|
*/
|
|
ol.webgl.SUPPORTED = (function() {
|
|
if (!('WebGLRenderingContext' in goog.global)) {
|
|
return false;
|
|
}
|
|
try {
|
|
var canvas = goog.dom.createElement(goog.dom.TagName.CANVAS);
|
|
return !goog.isNull(ol.webgl.getContext(canvas));
|
|
} catch (e) {
|
|
return false;
|
|
}
|
|
})();
|