On 09.05.2017 12:59, Philipp Zabel wrote:
On Tue, 2017-05-09 at 12:48 +0200, Volker Vogelhuber wrote:
[...]
Ok thanks for the clarification. There is only one missing part for the
GL_TEXTURE_2D case. The second EGLImage is created internally when
calling eglCreateImage with EGL_LINUX_DMA_BUF_EXT, so I only
have one return value I can bind to a texture using
glEGLImageTargetTexture2DOES.
Is there any "get" function to access the ARGB eglimage to bind it to
another
texture?
You create two separate EGLImages, calling eglCreateImage once for each
plane. See for example:
https://cgit.freedesktop.org/gstreamer/gst-plugins-bad/tree/gst-libs/gst/gl/gstglupload.c#n646
or
https://cgit.freedesktop.org/wayland/weston/tree/libweston/gl-renderer.c#n1536
That assumes I have two planes available. But as mentioned the planes
are created internally by dri2_create_image_dma_buf during my call of
eglCreateImage.
So from the API point of view I only have one FD from the V4L2 buffer
that is of type
FOURCC('Y','U','Y','V'). Passing that FD to eglCreateImage returns only
one EGLImage.
Although understanding gstreamer code is always a bit hard, I think in
their case they have
a mulit plane V4L2 buffer, where I only have a single plane buffer.
That's why I wonder if there is a way to retrieve the "second" EGLImage
after eglCreateImage
has been called for the single V4L2 DMABUF file descriptor.
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