我们的志愿者还没有将这篇文章翻译为 中文 (简体)。加入我们帮助完成翻译！
The WebGLRenderingContext.generateMipmap() method of the WebGL API generates a set of mipmaps for a WebGLTexture object.
Mipmaps are used to create distance with objects. A higher-resolution mipmap is used for objects that are closer, and a lower-resolution mipmap is used for objects that are farther away. It starts with the resolution of the texture image and halves the resolution until a 1x1 dimension texture image is created.
Syntax
void gl.generateMipmap(target);
Parameters
- target
- A
GLenumspecifying the binding point (target) of the active texture whose mipmaps will be generated. Possible values:gl.TEXTURE_2D: A two-dimensional texture.gl.TEXTURE_CUBE_MAP: A cube-mapped texture.- When using a WebGL 2 context, the following values are available additionally:
gl.TEXTURE_3D: A three-dimensional texture.gl.TEXTURE_2D_ARRAY: A two-dimensional array texture.
Return value
None.
Examples
gl.generateMipmap(gl.TEXTURE_2D);
Specifications
| Specification | Status | Comment |
|---|---|---|
| WebGL 1.0 The definition of 'generateMipmap' in that specification. |
Recommendation | Initial definition for WebGL. |
| OpenGL ES 2.0 The definition of 'glGenerateMipmap' in that specification. |
Standard | Man page of the (similar) OpenGL ES 2.0 API. |
| OpenGL ES 3.0 The definition of 'glGenerateMipmap' in that specification. |
Standard | Man page of the (similar) OpenGL ES 3.0 API. Adds: gl.TEXTURE_3D and gl.TEXTURE_2D_ARRAY |
Browser compatibility
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | 9 | 12 | 4.0 (2.0) | 11 | 12 | 5.1 |
| WebGL 2 | No support [2] | No support | Nightly build [1] | No support | No support | No support |
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | Firefox OS | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|
| Basic support | ? | 25 | 4.0 (2.0) | 1.0 | ? | 12 | 8.0 |
| WebGL 2 | No support | No support | No support | No support | No support | No support | No support |
[1] WebGL 2 is enabled by default in Firefox Nightly. To enable it in a release version of Firefox, set the preference webgl.enable-prototype-webgl2 to true in about:config.
[2] To use an experimental implementation of WebGL 2 in Chrome, you have to start Chrome with the runtime flag --enable-unsafe-es3-apis.