gl-renderer: Add comment for yuv_format_descriptor

Try to describe this and yuv_plane_descriptor as well, since they're not
blindingly obvious.

Signed-off-by: Daniel Stone <daniels@collabora.com>
dev
Daniel Stone 3 years ago committed by Pekka Paalanen
parent 18a31a6af8
commit 67fc71214d
  1. 10
      libweston/renderer-gl/gl-renderer.c

@ -118,6 +118,16 @@ struct dmabuf_format {
int num_modifiers;
};
/*
* yuv_format_descriptor and yuv_plane_descriptor describe the translation
* between YUV and RGB formats. When native YUV sampling is not available, we
* bind each YUV plane as one or more RGB plane and convert in the shader.
* This structure describes the mapping: output_planes is the number of
* RGB images we need to bind, each of which has a yuv_plane_descriptor
* describing the GL format and the input (YUV) plane index to bind.
*
* The specified shader_variant is then used to sample.
*/
struct yuv_plane_descriptor {
uint32_t format;
int plane_index;

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