WebGL EXT_texture_norm16 Extension Specification

Name

EXT_texture_norm16

Contact

WebGL working group (public_webgl 'at' khronos.org)

Contributors

Rijubrata Bhaumik (rijubrata.bhaumik 'at' intel.com)

Members of the WebGL working group

Version

Last modified date: August 13, 2020
Revision: 4

Number

WebGL extension #44

Dependencies

Written against the WebGL API 2.0 specification.

Overview

This extension exposes the EXT_texture_norm16 functionality to WebGL.

The following WebGL-specific behavioral changes apply:

• Support for UNSIGNED_SHORT textures as FBO attachments.

Consult the above extension for documentation, issues and new functions and enumerants.

When this extension is enabled:

• This extension provides a set of new 16-bit signed normalized and unsigned normalized fixed point texture, renderbuffer and texture buffer formats. The 16-bit normalized fixed point types R16_EXT, RG16_EXT and RGBA16_EXT become available as color-renderable formats. Renderbuffers can be created in these formats. These and textures created with type = UNSIGNED_SHORT, which will have one of these internal formats, can be attached to framebuffer object color attachments for rendering.
• The texImage2D and texSubImage2D entry points taking ArrayBufferView are extended to accept Uint16Array with the pixel type UNSIGNED_SHORT and Int16Array with the pixel type SHORT.
• The texImage2D and texSubImage2D entry points taking ImageData, HTMLImageElement, HTMLCanvasElement and HTMLVideoElement are extended to accept the pixel type UNSIGNED_SHORT.

IDL

[NoInterfaceObject]
interface EXT_texture_norm16 {
  const GLenum R16_EXT = 0x822A;
  const GLenum RG16_EXT = 0x822C;
  const GLenum RGB16_EXT = 0x8054;
  const GLenum RGBA16_EXT = 0x805B;
  const GLenum R16_SNORM_EXT = 0x8F98;
  const GLenum RG16_SNORM_EXT = 0x8F99;
  const GLenum RGB16_SNORM_EXT = 0x8F9A;
  const GLenum RGBA16_SNORM_EXT = 0x8F9B;
};
  

Revision History

Revision 1, 2019/03/27

• Initial Draft.

Revision 2, 2019/09/25

• Promoted to Draft.

Revision 3, 2020/08/10

• Specialized to WebGL 2.0 after WG agreement, since this extension refers to sized internal formats unavailable in WebGL 1.0.

Revision 4, 2020/08/13

• Promoted to Community Approved.