vo_opengl: support inconsistent negative strides per plane

GL generally does not support flipping the image on upload, meaning
negative strides are not supported. vo_opengl handles this by flipping
rendering if the stride is inverted, and gl_pbo_upload() "ignores"
negative strides by uploading without flipping the image.

If individual planes had strides with different signs, this broke. The
flipping affected the entire image, and only the sign of the first plane
was respected.

This is just a crazy corner case that will never happen, but it turns
out this is quite simple to support, and actually improves the code
somewhat.

0 files changed, 0 insertions, 0 deletions