38 lines
1.0 KiB
JavaScript
38 lines
1.0 KiB
JavaScript
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var check = require('./util/check')
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module.exports = function createExtensionCache (gl, config) {
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var extensions = {}
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function tryLoadExtension (name_) {
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check.type(name_, 'string', 'extension name must be string')
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var name = name_.toLowerCase()
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var ext
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try {
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ext = extensions[name] = gl.getExtension(name)
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} catch (e) {}
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return !!ext
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}
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for (var i = 0; i < config.extensions.length; ++i) {
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var name = config.extensions[i]
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if (!tryLoadExtension(name)) {
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config.onDestroy()
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config.onDone('"' + name + '" extension is not supported by the current WebGL context, try upgrading your system or a different browser')
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return null
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}
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}
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config.optionalExtensions.forEach(tryLoadExtension)
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return {
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extensions: extensions,
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restore: function () {
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Object.keys(extensions).forEach(function (name) {
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if (extensions[name] && !tryLoadExtension(name)) {
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throw new Error('(regl): error restoring extension ' + name)
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}
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})
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}
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}
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}
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