WebGL EXT_frag_depth Extension Draft Specification

Name

EXT_frag_depth

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

Florian Boesch (pyalot 'at' gmail.com)

Members of the WebGL working group

Last modified date: December 17, 2012
Revision: 2

WebGL extension #16

Written against the WebGL API 1.0 specification.

This extension exposes the EXT_frag_depth 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:

Adds the ability to set the depth value of a fragment from within the fragment shader with the built-in output variable gl_FragDepthEXT.
When a fragment shader enables, requires, or warns GL_EXT_frag_depth with an #extension directive:
- float gl_FragDepthEXT is a built-in output.
The GLSL macro GL_EXT_frag_depth is defined as 1.

    interface EXT_frag_depth {
    };

    void main(){
        gl_FragColor = vec4(1.0, 0.0, 1.0, 1.0);
        gl_FragDepthEXT = 0.5;
    }

Revision 1, 2012/11/22

Revision 2, 2012/12/17