WebGL OES_standard_derivatives Khronos Ratified Extension Specification

Name

OES_standard_derivatives

Contact

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

Contributors

Members of the WebGL working group

Version

Last modified date: July 15, 2014
Revision: 5

Number

WebGL extension #4

Dependencies

Written against the WebGL API 1.0 specification.

Promoted to core and no longer available as an extension in WebGL API 2.0 specification. Requires GLSL #version 300 es.

Overview

This extension exposes the OES_standard_derivatives 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:

• The hint entry point accepts FRAGMENT_SHADER_DERIVATIVE_HINT_OES as a target and the getParameter entry point accepts it as a pname.
• When a fragment shader enables, requires, or warns GL_OES_standard_derivatives with an #extension directive:
  • genType dFdx(genType) is a built-in function.
  • genType dFdy(genType) is a built-in function.
  • genType fwidth(genType) is a built-in function.
• The GLSL macro GL_OES_standard_derivatives is defined as 1.

IDL

[Exposed=(Window,Worker), LegacyNoInterfaceObject]
interface OES_standard_derivatives {
    const GLenum FRAGMENT_SHADER_DERIVATIVE_HINT_OES = 0x8B8B;
};
  

Revision History

Revision 1, 2010/01/13

• Initial revision.

Revision 2, 2011/12/07

• Added genType argument and return type to function declarations.

Revision 3, 2012/01/03

• Removed webgl module per changes to Web IDL spec.

Revision 4, 2013/05/15

• Ratified by Khronos Board of Promoters.

Revision 5, 2014/07/15

• Added NoInterfaceObject extended attribute.