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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/OES_texture_half_float_linear below:

OES_texture_half_float_linear extension - Web APIs

Limited availability

The OES_texture_half_float_linear extension is part of the WebGL API and allows linear filtering with half floating-point pixel types for textures.

WebGL extensions are available using the WebGLRenderingContext.getExtension() method. For more information, see also Using Extensions in the WebGL tutorial.

Note: This extension is only available to WebGL1 contexts. In WebGL2, the functionality of this extension is available on the WebGL2 context by default and the extension is not needed.

The OES_texture_half_float extension alone does not allow linear filtering with half floating-point textures. This extension enables this ability.

With the help of this extension, you can now set the magnification or minification filter in the WebGLRenderingContext.texParameter() method to one of gl.LINEAR, gl.LINEAR_MIPMAP_NEAREST, gl.NEAREST_MIPMAP_LINEAR, or gl.LINEAR_MIPMAP_LINEAR, and use half floating-point textures.

const halfFloat = gl.getExtension("OES_texture_half_float");
gl.getExtension("OES_texture_half_float_linear");

const texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);

gl.texParameterf(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
gl.texImage2D(
  gl.TEXTURE_2D,
  0,
  gl.RGBA,
  gl.RGBA,
  halfFloat.HALF_FLOAT_OES,
  image,
);

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