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

OES_texture_float extension - Web APIs

This extension extends WebGLRenderingContext.texImage2D() and WebGLRenderingContext.texSubImage2D():

The type parameter now accepts gl.FLOAT.
The pixels parameter now accepts a Float32Array.

Linear filtering on floating-point textures is not allowed with this extension. If you 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 floating-point textures, the texture will be marked as incomplete.

To use linear filtering on floating-point textures, enable the OES_texture_float_linear extension in addition to this extension.

Floating-point color buffers

This extension implicitly enables the WEBGL_color_buffer_float extension (if supported), which allows rendering to 32-bit floating-point color buffers.

Examples

const ext = gl.getExtension("OES_texture_float");

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

gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.FLOAT, image);

Specifications Browser compatibility

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