Name

    CHROMIUM_bind_generates_resource

Name Strings

    GL_CHROMIUM_bind_generates_resource

Contributors

    Geoff Lang

Contact

    Geoff Lang (geofflang 'at' google.com)

Notice

    Copyright (c) 2016 The Khronos Group Inc. Copyright terms at
        http://www.khronos.org/registry/speccopyright.html

Status

    Draft

Version

    Version 1, September 19, 2016

Number

    OpenGL ES Extension #??

Dependencies

    Requires OpenGL ES 2.0

    Written against the OpenGL ES 2.0 specification.

Overview

    This extension allows the user to control the behaviour when binding an
    object that has not been generated.  This functionality is useful to
    notify the user of potential use-after-free errors or support other APIs
    such as WebGL on top of an OpenGL ES context.

New Procedures and Functions

    None

New Tokens

    Accepted by the <cap> parameter to IsEnabled and the <pname> parameter to
    GetBooleanv, GetIntegerv, GetFloatv, and GetInteger64v:

    BIND_GENERATES_RESOURCE_CHROMIUM            0x9244

Additions to the OpenGL ES Specification

    Add to the end of Section 2.9 "Buffer Objects":

    If BIND_GENERATES_RESOURCE_CHROMIUM is false, BindBuffer fails and an
    INVALID_OPERATION error is generated if buffer is not zero or a name
    returned from a previous call to GenBuffers, or if such a name has since
    been deleted with DeleteBuffers.

    Add to the end of Section 3.7.13 "Texture Objects":

    If BIND_GENERATES_RESOURCE_CHROMIUM is false, BindTexture fails and an
    INVALID_OPERATION error is generated if texture is not zero or a name
    returned from a previous call to GenTextures, or if such a name has since
    been deleted with DeleteTextures.

    Add to the end of Section 4.4.1 "Binding and Managing Framebuffer Objects":

    If BIND_GENERATES_RESOURCE_CHROMIUM is false, BindFramebuffer fails and an
    INVALID_OPERATION error is generated if framebuffer is not zero or a name
    returned from a previous call to GenFramebuffers, or if such a name has
    since been deleted with DeleteFramebuffers.

    Add to the end of Section 4.4.3 "Renderbuffer Objects":

    If BIND_GENERATES_RESOURCE_CHROMIUM is false, BindRenderbuffer fails and an
    INVALID_OPERATION error is generated if renderbuffer is not zero or a name
    returned from a previous call to GenRenderbuffers, or if such a name has
    since been deleted with DeleteRenderbuffers.

New State

    Modify Table 6.22, Miscellaneous

    Add:

                                                      Initial
    Get Value                        Type Get Command Value   Description
    -----------------------          ---- ----------- ------- --------------
    BIND_GENERATES_RESOURCE_CHROMIUM B    IsEnabled   TRUE    Bind generates
                                                              new resources

Conformance Tests

    TBD

Issues

    (1) Should the BIND_GENERATES_RESOURCE_CHROMIUM state be enabled at context
        creation time or dynamically through the Enable and Disable functions?

    RESOLOVED: BIND_GENERATES_RESOURCE_CHROMIUM is initialized by a context
    creation attribute and cannot be modified.  One of the major use cases of
    this extension is to back WebGL contexts and the end user should not be
    allowed to modify this state.

Revision History

    Rev.    Date         Author     Changes
    ----  -------------  ---------  ----------------------------------------
      1   Sept 19, 2016  geofflang  Initial version