WebGLShaderPrecisionFormat

WebGLShaderPrecisionFormat interface is part of the WebGL API and represents the information returned by calling the WebGLRenderingContext.getShaderPrecisionFormat() 方法。

特性

WebGLShaderPrecisionFormat.rangeMin 只读
The base 2 log of the absolute value of the minimum value that can be represented.
WebGLShaderPrecisionFormat.rangeMax 只读
The base 2 log of the absolute value of the maximum value that can be represented.
WebGLShaderPrecisionFormat.precision 只读
The number of bits of precision that can be represented. For integer formats this value is always 0.

范例

A WebGLShaderPrecisionFormat object is returned by the WebGLRenderingContext.getShaderPrecisionFormat() 方法。

var canvas = document.getElementById('canvas');
var gl = canvas.getContext('webgl');
gl.getShaderPrecisionFormat(gl.VERTEX_SHADER, gl.MEDIUM_FLOAT);
// WebGLShaderPrecisionFormat { rangeMin: 127, rangeMax: 127, precision: 23 }
					

规范

规范 状态 Comment
WebGL 1.0
The definition of 'WebGLShaderPrecisionFormat' in that specification.
Recommendation 初始定义。

浏览器兼容性

更新 GitHub 上的兼容性数据
Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
WebGLShaderPrecisionFormat Chrome 9 Edge 12 Firefox 4 IE 11 Opera 12 Safari 5.1 WebView Android Yes Chrome Android 25 Firefox Android Yes Opera Android 12 Safari iOS 8 Samsung Internet Android 1.5
precision Chrome 9 Edge 12 Firefox 4 IE 11 Opera 12 Safari 5.1 WebView Android Yes Chrome Android 25 Firefox Android Yes Opera Android 12 Safari iOS 8 Samsung Internet Android 1.5
rangeMax Chrome 9 Edge 12 Firefox 4 IE 11 Opera 12 Safari 5.1 WebView Android Yes Chrome Android 25 Firefox Android Yes Opera Android 12 Safari iOS 8 Samsung Internet Android 1.5
rangeMin Chrome 9 Edge 12 Firefox 4 IE 11 Opera 12 Safari 5.1 WebView Android Yes Chrome Android 25 Firefox Android Yes Opera Android 12 Safari iOS 8 Samsung Internet Android 1.5
Available in workers
Chrome No Edge No Firefox 44
Disabled
44
Disabled
Disabled From version 44: this feature is behind the gfx.offscreencanvas.enabled preference (needs to be set to true ). To change preferences in Firefox, visit about:config.
IE No Opera No Safari No WebView Android No Chrome Android No Firefox Android No Opera Android No Safari iOS No Samsung Internet Android No

图例

完整支持
完整支持
不支持
不支持
实验。期望将来行为有所改变。
实验。期望将来行为有所改变。
用户必须明确启用此特征。
用户必须明确启用此特征。

另请参阅