EXT_texture_norm16 extension

The EXT_texture_norm16 extension is part of the WebGL API and provides a set of new 16-bit signed normalized and unsigned normalized formats (fixed-point texture, renderbuffer and texture buffer).

When this extension is enabled:

• The WebGLRenderingContext.texImage2D() and WebGLRenderingContext.texSubImage2D() methods accept new formats provided by this extension.
• The 16-bit normalized fixed-point types ext.R16_EXT, ext.RG16_EXT and ext.RGBA16_EXT become available as color-renderable formats and renderbuffers and be created in these formats.

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

Constants

ext.R16_EXT

Red 16-bit unsigned format. Color-renderable.

ext.RG16_EXT

RG 16-bit unsigned format. Color-renderable.

ext.RGB16_EXT

RGB 16-bit unsigned format.

ext.RGBA16_EXT

RGBA 16-bit unsigned format. Color-renderable.

ext.R16_SNORM_EXT

Red 16-bit signed normalized format.

ext.RG16_SNORM_EXT

RG 16-bit signed normalized format.

ext.RGB16_SNORM_EXT

RGB 16-bit signed normalized format.

ext.RGBA16_SNORM_EXT

RGBA 16-bit signed normalized format.

Examples

Enabling the extension

let ext = gl.getExtension("EXT_texture_norm16");

Texture formats

The WebGLRenderingContext.texImage2D() method accepts new formats when EXT_texture_norm16 is enabled. Example calls:

// imageData = Uint16Array
gl.texImage2D(gl.TEXTURE_2D, 0, ext.R16_EXT, 1, 1, 0, gl.RED, gl.UNSIGNED_SHORT, imageData);
gl.texImage2D(gl.TEXTURE_2D, 0, ext.RG16_EXT, 1, 1, 0, gl.RG, gl.UNSIGNED_SHORT, imageData);
gl.texImage2D(gl.TEXTURE_2D, 0, ext.RGB16_EXT, 1, 1, 0, gl.RGB, gl.UNSIGNED_SHORT, imageData);
gl.texImage2D(gl.TEXTURE_2D, 0, ext.RGBA16_EXT, 1, 1, 0, gl.RGBA, gl.UNSIGNED_SHORT, imageData);

// imageData = Int16Array
gl.texImage2D(gl.TEXTURE_2D, 0, ext.R16_SNORM_EXT, 1, 1, 0, gl.RED, gl.SHORT, imageData);
gl.texImage2D(gl.TEXTURE_2D, 0, ext.RG16_SNORM_EXT, 1, 1, 0, gl.RG, gl.SHORT, imageData);
gl.texImage2D(gl.TEXTURE_2D, 0, ext.RGB16_SNORM_EXT, 1, 1, 0, gl.RGB, gl.SHORT, imageData);
gl.texImage2D(gl.TEXTURE_2D, 0, ext.RGBA16_SNORM_EXT, 1, 1, 0, gl.RGBA, gl.SHORT, imageData);

Renderbuffer formats

The WebGLRenderingContext.renderbufferStorage() method accepts ext.R16_EXT, ext.RG16_EXT and ext.RGBA16_EXT as internal formats to create renderbuffers in these formats. Example calls:

gl.renderbufferStorage(gl.RENDERBUFFER, ext.R16_EXT, 1, 1);
gl.renderbufferStorage(gl.RENDERBUFFER, ext.RG16_EXT, 1, 1);
gl.renderbufferStorage(gl.RENDERBUFFER, ext.RGBA16_EXT, 1, 1);

Specifications

Browser compatibility

See also

• WebGLRenderingContext.getExtension()
• WebGLRenderingContext.texImage2D()
• WebGLRenderingContext.renderbufferStorage()