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The WebGLRenderingContext.activeTexture() method of the WebGL API specifies which texture unit to make active.
Syntax
void gl.activeTexture(texture);
Parameters
texture- The texture unit to make active. The value is a
gl.TEXTUREIwhere I is within the range from 0 togl.MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1.
Return value
None.
Exceptions
If texture is not one of gl.TEXTUREI, where I is within the range from 0 to gl.MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1, a gl.INVALID_ENUM error is thrown.
Examples
The following call selects gl.TEXTURE1 as the current texture. Subsequent calls that modify the texture state will affect this texture.
gl.activeTexture(gl.TEXTURE1);
The number of texture units is implementation dependent, you can get this number with the help of the MAX_COMBINED_TEXTURE_IMAGE_UNITS constant. It is, per specification, at least 8.
gl.getParameter(gl.MAX_COMBINED_TEXTURE_IMAGE_UNITS);
To get the active texture, query the ACTIVE_TEXTURE constant.
gl.activeTexture(gl.TEXTURE0); gl.getParameter(gl.ACTIVE_TEXTURE); // returns "33984" (0x84C0, gl.TEXUTURE0 enum value)
Specifications
| Specification | Status | Comment |
|---|---|---|
| WebGL 1.0 The definition of 'activeTexture' in that specification. |
Recommendation | Initial definition. |
| OpenGL ES 2.0 The definition of 'glActiveTexture' in that specification. |
Standard | Man page of the OpenGL API. |
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | 9 | 4.0 (2.0) | 11 | 12 | 5.1 |
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | ? | 25 | (Yes) | ? | 12 | 8.1 |