vrend: correct blit/copy_image code path

Closed Gert Wollny requested to merge gerddie/virglrenderer:fix-copy-image into master

Gallium copy_image redirects calls to resource_copy_region for equal src and dst formats or if at least one of the two is compressed. Handle the condition for selecting blit vs. glCopyImageSubRegion accordingly.

Fixes piglit: bptc-float-modes

Signed-off-by: Gert Wollny gert.wollny@collabora.com

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