WebGLRenderingContext: activeTexture() method
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
Note: This feature is available in Web Workers.
The WebGLRenderingContext.activeTexture() method of the WebGL API specifies which texture unit to make active.
Syntax
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 (undefined).
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.TEXTURE0 enum value) Specifications
| Specification |
|---|
| WebGL Specification # 5.14.3 |