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<?xml version="1.0" encoding="UTF-8"?>

<extension href="EXT_color_buffer_float/">

  <name>EXT_color_buffer_float</name>

  <contact> <a href="https://www.khronos.org/webgl/public-mailing-list">WebGL

  working group</a> (public_webgl 'at' khronos.org) </contact>

  <contributors>

    <contributor>Mark Callow, HI Corporation</contributor>

    <contributor>Members of the WebGL working group</contributor>

  </contributors>

  <number>31</number>

  <depends>

    <api version="2.0"/>

  </depends>

  <overview>

    <mirrors href="http://www.khronos.org/registry/gles/extensions/EXT/EXT_color_buffer_float.txt"

             name="EXT_color_buffer_float">

      <addendum>

        The sized internal format <code>RGB16F</code> is not color-renderable in this

        extension. This is a difference in functionality compared to the <a

        href="../EXT_color_buffer_half_float">EXT_color_buffer_half_float</a> extension.

      </addendum>

    </mirrors>

    <features>

      <feature>

        <p>The following floating-point internal formats become <span

        style="font-style: italic">color-renderable</span>: <code>R16F</code>,

        <code>RG16F</code>, <code>RGBA16F</code>, <code>R32F</code>,

        <code>RG32F</code>, <code>RGBA32F</code> and

        <code>R11F_G11F_B10F</code>. 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.</p>

      </feature>

      <feature>

        <p>Renderbuffers with these internal formats can be created.</p>

      </feature>

      <feature>

        <p>The format and type combination <code>RGBA</code> and

        <code>FLOAT</code> becomes valid for reading from a floating-point

        color buffer.</p>

      </feature>

    </features>

    <p>Notes: <ul style="list-style-type: circle">

        <li>Fragment shader outputs to buffers with these internal formats are

        not clamped.</li>

        <li>Colors specified with <code>clearColor</code> and

        <code>blendColor</code> are not clamped when applied to buffers with

        these internal formats.</li>

        <li>The format and type combination <code>RGBA</code> and

        <code>UNSIGNED_BYTE</code> cannot be used for reading from a

        floating-point color buffer.</li>

        <li>Multi-sample floating-point color renderbuffers may optionally be supported. Limitations

        are defined in the <a

        href="http://www.khronos.org/registry/gles/extensions/EXT/EXT_color_buffer_float.txt">EXT_color_buffer_float</a>

        extension.</li>

        <li>The sized internal format <code>RGB16F</code> is not color-renderable in this

        extension.</li>

      </ul></p>

  </overview>

  <idl xml:space="preserve">

[NoInterfaceObject]

interface EXT_color_buffer_float {

}; // interface EXT_color_buffer_float

</idl>

  <history>

    <revision date="2012/11/08">

      <change>Initial revision.</change>

    </revision>

    <revision date="2014/07/15">

      <change>Added NoInterfaceObject extended attribute.</change>

    </revision>

    <revision date="2014/10/29">

      <change>Moved to draft status.</change>

    </revision>

    <revision date="2016/04/14">

      <change>Moved to community approved status.</change>

    </revision>

    <revision date="2016/06/16">

      <change>Added note about RGB16F not being color-renderable.</change>

    </revision>

    <revision date="2016/07/21">

      <change>Allowed allocation of multi-sample floating-point color renderbuffers as optional functionality.</change>

      <change>Changed XML tags to fix incorrect statement that there are no behavioral changes compared to the native extension.</change>

    </revision>

    <revision date="2016/08/03">

      <change>Removed incorrect statement about framebuffer completeness and multi-sampled floating-point color renderbuffers.</change>

    </revision>

    <revision date="2017/04/19">

      <change>Allowed these float formats for CopyTexImage2D.</change>

    </revision>

  </history>

</extension>