angle/extensions/EGL_ANGLE_stream_producer_d3d_texture.txt

Name

    ANGLE_stream_producer_d3d_texture

Name Strings

    EGL_ANGLE_stream_producer_d3d_texture

Contributors

    Ian Ewell
    Geoff Lang
    John Bauman
    Jeff Gilbert

Contacts

    Geoff Lang, Google (geofflang ‘at’ google.com)

Status

    Draft

Version

    Version 2, November 15, 2017

Number

    EGL Extension #XXX

Dependencies

    Requires EGL 1.4.
    Requires OpenGL ES 2.0.

    Requires the EGL_KHR_stream extension.
    Requires the EGL_NV_stream_consumer_gltexture_yuv extension.
    Requires the EGL_KHR_stream_consumer_gltexture extension.
    Requires the EGL_ANGLE_device_d3d extension.

Overview

    This extension allows D3D11 textures to be inserted into an EGL stream
    with the expectation that the stream consumer will be either an RGB GL
    texture consumer, or a YUV GL texture consumer using a two plane
    configuration (i.e. a Y plane and a UV plane).
    This will act as the producer of the stream.

New procedures and functions

    EGLBoolean eglCreateStreamProducerD3DTextureANGLE(
                EGLDisplay dpy,
                EGLStreamKHR stream,
                const EGLAttrib *attrib_list)
    EGLBoolean eglStreamPostD3DTextureANGLE(EGLDisplay dpy,
                EGLStreamKHR stream,
                void *texture,
                const EGLAttrib *attrib_list)

New Tokens

    Accepted as an <attribute> in eglStreamPostD3DTextureANGLE:

        EGL_D3D_TEXTURE_SUBRESOURCE_ID_ANGLE 0x33AB

Replace section "3.10.3.1 No way to connect producer to EGLStream" in the
EGL_KHR_stream extension with this:

    3.10.3.1 Stream Surface Producer

    Call

        EGLBoolean eglCreateStreamProducerD3DTextureANGLE(
                    EGLDisplay dpy,
                    EGLStreamKHR stream,
                    const EGLAttrib *attrib_list)

    to create a producer that accepts D3D11 textures and connect it as the
    producer of <stream>. <attrib_list> is used to specify attributes for the
    stream producer. Currently there are no attributes to specify, and the
    attribute list is used as a placeholder for future additions.

    On failure, eglCreateStreamProducerD3DTextureANGLE returns EGL_FALSE and
    generates an error.

        - EGL_BAD_STATE_KHR is generated if <stream> is not in the state
          EGL_STREAM_STATE_CONNECTING_KHR.

        - EGL_BAD_MATCH is generated if <stream> does not have a connected GL
          texture consumer.

        - EGL_BAD_STREAM_KHR is generated if <stream> is not a valid EGLStream
          generated for <dpy>.

        - EGL_BAD_DISPLAY is generated if <dpy> is not a valid, initialized
          display.

Add a section preceding "3.9.3 Posting Semantics" in the EGL specification:

    3.9.x Posting to a Stream

    To post a D3D11 texture to a stream, call

        EGLBoolean eglStreamPostD3DTextureANGLE(
                    EGLDisplay dpy,
                    EGLStreamKHR stream,
                    void *texture,
                    const EGLAttrib *attrib_list);

    If <stream> is an appropriately configured stream and <texture> points to a
    valid ID3D11Texture2D object of a supported format that is owned
    by the same ID3D11Device that is queried with the EGL_ANGLE_device_d3d
    extension, the texture will be posted to the stream and can be bound as one
    or more OpenGL texture objects.

    The parameter <attrib_list> allows for per-frame attributes to be specified
    along with the texture. The only parameter currently available is
    EGL_D3D_TEXTURE_SUBRESOURCE_ID_ANGLE, which allows the subresource id of
    the texture that will be used to be specified. If this attribute is not
    explicitly specified, it will default to the value of 0.

    It is the responsibility of the application to perform any synchronization
    between the insertion of the frame into the stream and the use of the
    consumer textures output by the stream. The EGL_CONSUMER_LATENCY_USEC_KHR
    attribute will have no effect on the function of the implementation of this
    extension, but can still be used for communication between components of
    the application.

    The implementation will hold a reference to the D3D11 texture object if the
    insertion is successful and will release the texture object when a new frame
    is inserted or when the stream is destroyed.

    On failure, eglStreamInsertD3DTexture returns EGL_FALSE and generates an
    error.

        - EGL_BAD_STATE is generated if <stream> is not in the state
          EGL_STREAM_STATE_EMPTY_KHR, EGL_STREAM_STATE_NEW_FRAME_AVAILABLE_KHR,
          or EGL_STREAM_STATE_OLD_FRAME_AVAILABLE_KHR.

        - EGL_BAD_MATCH is generated if the stream is not associated with a
          D3D11 texture producer.

        - EGL_BAD_PARAMETER is generated if <texture> is not owned by the
          queried device, is not a supported format, is not compatible with the
          implementation, or if the specified value for
          EGL_D3D_TEXTURE_SUBRESOURCE_ID_ANGLE is not a valid subresource id for
          the texture.

        - EGL_BAD_STREAM_KHR is generated if <stream> is not a valid EGLStream.

        - EGL_BAD_ATTRIBUTE is generated if an attribute other than
          EGL_D3D_TEXTURE_SUBRESOURCE_ID_ANGLE is specified in <attrib_list>.

Revision History

    #1 (April 6, 2016) Ian Ewell
        - initial draft

    #2 (November 15, 2017) Jeff Gilbert
        - Rename from EGL_ANGLE_stream_producer_d3d_texture_nv12 to
          EGL_ANGLE_stream_producer_d3d_texture
        - Remove NV12 suffix from function names
        - add RGB GL texture consumer support
        - reduce required EGL version to 1.4 (from 1.5)