[Bug 93704] Stencil blits from targets other than GL_TEXTURE_2D or GL_TEXTURE_2D_MULTISAMPLE are probably broken

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93704

--- Comment #2 from Ian Romanick <idr at freedesktop.org> ---
Looking back at the GIT history, it appears that GL_TEXTURE_2D and
GL_TEXTURE_2D_MULTISAMPLE were the only targets supported when
GL_ARB_stencil_texturing did not exist.  A renderbuffer was the only way to get
stencil because internally we use separate stencil on these GENs even for
packed depth / stencil targets.  _mesa_meta_bind_rb_as_tex_image would only
generate those two targets.

When support for GL_ARB_stencil_texturing was added for GEN8+, we had only one
test in piglit.  It didn't hit the non-GL_TEXTURE_2D* path, so nobody noticed.

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