WebGL EXT_color_buffer_float Extension Specification

Name

EXT_color_buffer_float

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

Mark Callow, HI Corporation

Members of the WebGL working group

Last modified date: April 19, 2017
Revision: 8

WebGL extension #31

Written against the WebGL API 2.0 specification.

This extension exposes the EXT_color_buffer_float functionality to WebGL.

The following WebGL-specific behavioral changes apply:

The sized internal format RGB16F is not color-renderable in this extension. This is a difference in functionality compared to the EXT_color_buffer_half_float extension.

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

When this extension is enabled:

The following floating-point internal formats become color-renderable: R16F, RG16F, RGBA16F, R32F, RG32F, RGBA32F and R11F_G11F_B10F. A renderbuffer or a texture with a color-renderable internal format can be used as a rendering target by attaching it to a framebuffer object as a color attachment.
Renderbuffers with these internal formats can be created.
The format and type combination RGBA and FLOAT becomes valid for reading from a floating-point color buffer.

Notes:

Fragment shader outputs to buffers with these internal formats are not clamped.
The format and type combination RGBA and UNSIGNED_BYTE cannot be used for reading from a floating-point color buffer.
Multi-sample floating-point color renderbuffers may optionally be supported. Limitations are defined in the EXT_color_buffer_float extension.
The sized internal format RGB16F is not color-renderable in this extension.

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

Revision 1, 2012/11/08

Revision 2, 2014/07/15

Revision 3, 2014/10/29

Revision 4, 2016/04/14

Revision 5, 2016/06/16

Revision 6, 2016/07/21

Allowed allocation of multi-sample floating-point color renderbuffers as optional functionality.
Changed XML tags to fix incorrect statement that there are no behavioral changes compared to the native extension.

Revision 7, 2016/08/03

Removed incorrect statement about framebuffer completeness and multi-sampled floating-point color renderbuffers.

Revision 8, 2017/04/19