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e80a23eae6
DirectGLES served every multi-slice glGetTexImage from the CPU shadow copy, on the grounds that its scratch FBO can only expose one layer at a time. But the shadow only holds what was uploaded, so any slice that was rendered to rather than written by glTexSubImage came back stale - and a layered framebuffer produces exactly that. The scratch FBO can expose one layer at a time repeatedly. The read now attaches each layer in turn and takes the slice off the GPU, walking the destination over GL_PACK_SKIP_IMAGES / GL_PACK_IMAGE_HEIGHT itself so each per-slice call packs a plain 2D image with the same layout StoreWideRowsToClient computes for the whole stack. The shadow stays as the fallback for the formats a colour attachment cannot represent at all, and for any slice whose attachment comes back incomplete. Takes all 27 remaining direct_state_access.textures_storage_multisample_3d_* cases from failing to passing on Espryt - they render into a TEXTURE_2D_MULTISAMPLE_ARRAY one layer per colour attachment and then read the whole array back. DirectVulkan is untouched.