EXT_float_blend

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 Using Extensions WebGL tutorial .

Availability: 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 as well.

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 error.

Usage notes

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

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
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

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。
见实现注意事项。

另请参阅