WebGL EXT_float_blend Extension Specification

Name

EXT_float_blend

Contact

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

Contributors

Mark Callow

Members of the WebGL working group

Version

Last modified date: August 27, 2019
Revision: 5

Number

WebGL extension #35

Dependencies

Written against the WebGL API 1.0 specification.

Written against the WEBGL_color_buffer_float specification.

Written against the EXT_color_buffer_float specification.

Overview

This extension exposes the EXT_float_blend functionality to WebGL.

There are no WebGL-specific behavioral changes.

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

When this extension is enabled:

• An INVALID_OPERATION error will no longer be raised by drawArrays or drawElements when blending is enabled and the draw buffer has 32-bit floating-point components. Note that in order to create such a draw buffer the EXT_color_buffer_float or WEBGL_color_buffer_float extensions must be enabled. This extension applies to both WebGL 1.0 and 2.0 contexts.

• On supported systems, this extension is implicitly enabled when any of the following extensions are enabled:
  • EXT_color_buffer_float
  • OES_texture_float
  • WEBGL_color_buffer_float

  This preserves functionality for content written before this extension was exposed.

IDL

[Exposed=(Window,Worker), LegacyNoInterfaceObject]
interface EXT_float_blend {
}; // interface EXT_float_blend

Revision History

Revision 1, 2015/04/13

• Initial revision.

Revision 2, 2017/01/03

• Promoted to draft status after discussion on public_webgl.

Revision 3, 2019/02/01

• Backport to WebGL 1.

Revision 4, 2019/03/15

• Implicitly enable to preserve existing content.
• Promote to Community Approved.

Revision 5, 2019/08/27

• Clarified that this extension applies to both WebGL 1.0 and 2.0 contexts.