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EXT_texture_norm16 extension

files/en-us/web/api/ext_texture_norm16/index.md

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{{APIRef("WebGL")}}

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 {{domxref("WebGLRenderingContext.texImage2D()")}} and {{domxref("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 {{domxref("WebGLRenderingContext.getExtension()")}} method. For more information, see also Using Extensions in the WebGL tutorial.

[!NOTE] This extension is only available to {{domxref("WebGL2RenderingContext", "WebGL 2", "", 1)}} contexts.

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

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

Texture formats

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

js-nolint
// 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 {{domxref("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:

js
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

{{Specifications}}

Browser compatibility

{{Compat}}

See also

  • {{domxref("WebGLRenderingContext.getExtension()")}}
  • {{domxref("WebGLRenderingContext.texImage2D()")}}
  • {{domxref("WebGLRenderingContext.renderbufferStorage()")}}