For saving memory and improving performance，I want to use a special format texture to deal with jpeg picture. The format handles by GL_TEXTURE_EXTERNAL_OES but process is same to GL_TEXTURE_2D (only different from glBindTexture and shader program texture declaration) I have done it in egl hardware mode('rasterizer_type': 'direct-gles'). But have problems when I use skia hardware mode ('rasterizer_type': 'hardware'), I found skia hardware mode don`t support it directly and will call render_image_fallback_function_ (HardwareRasterizer::Impl::RenderTextureEGL) to deal with it likes 360 video. I found the result for display is very different from it show in egl hardware mode, It seems that the way only use to deal with 360 video. Is there a way to possible I let skia hardware mode support the special format directly or I only add a new way in TexturedMeshRenderer to deal with picture to distinguish 360 video.
Cobalt/Starboard supports letting the platform define custom (possibly accelerated) image decode functionality in starboard/image.h, are you using this to set GL_TEXTURE_EXTERNAL_OES, or are you modifying common Cobalt code?
If you are modifying Cobalt code, you may want to search through https://cobalt.googlesource.com/cobalt/+/master/src/cobalt/renderer/rasterizer/skia/hardware_image.cc for references to "GL_TEXTURE_2D" and make sure that they still make sense after your changes. In particular, you may need to adjust HardwareFrontendImage::CanRenderInSkia().