EXT_float_blend

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WebGL API 's EXT_float_blend extension allows blending and draw buffers with 32-bit floating-point components.

WebGL extensions are available using the WebGLRenderingContext.getExtension() method. For more information, see also 使用扩展在 WebGL 教程 .

可用性： This extension is available to both, WebGL1 and WebGL2 contexts. However, to use it, you need to enable the use of 32-bit floating-point draw buffers by enabling the extension WEBGL_color_buffer_float (for WebGL1) or EXT_color_buffer_float (for WebGL2). Doing so automatically enables EXT_float_blend 还。

With this extension enabled, calling drawArrays() or drawElements() with blending enabled and a draw buffer with 32-bit floating-point components will no longer result in an INVALID_OPERATION 错误。

用法注意事项

On devices that support the EXT_float_blend extension, it is automatically, implicitly, enabled when any one or more of EXT_color_buffer_float , OES_texture_float ，或 WEBGL_color_buffer_float are enabled. This ensures that content written before EXT_float_blend was exposed by WebGL will function as expected.

范例

const gl = canvas.getContext('webgl2');
// enable necessary extensions
gl.getExtension('EXT_color_buffer_float');
gl.getExtension('EXT_float_blend');
const tex = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, tex);
// use floating point format
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA32F, 1, 1, 0, gl.RGBA, gl.FLOAT, null);
const fb = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex, 0);
// enable blending
gl.enable(gl.BLEND);
gl.drawArrays(gl.POINTS, 0, 1);
// won't throw gl.INVALID_OPERATION with the extension enabled

规范

规范	状态
EXT_float_blend	草案

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`EXT_float_blend`	Chrome 75	Edge 79	Firefox 67	IE No	Opera No	Safari No	WebView Android No	Chrome Android 75 75 Until Chrome 77, this extension was unavailable on several Android devices powered by GLES 3.2. See bug 964208 .	Firefox Android No	Opera Android No	Safari iOS No	Samsung Internet Android No

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用法注意事项

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