CopyTexSubImage can be called on a multisample renderbuffer if the
renderbuffer is part of the window-system framebuffer (i.e. comes from
the visual).
IIRC, the game Cogs uses it if both MSAA and Post Filters are enabled.
Marek
On Fri, May 24, 2013 at 10:56 PM, Eric Anholt <e...@anholt.net> wrote:
> This is just in case someone else trips over this due to our weird reuse
> of this code in glBlitFramebuffer().
> ---
> src/mesa/drivers/dri/intel/intel_tex_copy.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/src/mesa/drivers/dri/intel/intel_tex_copy.c
> b/src/mesa/drivers/dri/intel/intel_tex_copy.c
> index 94e90da..4a13b9a 100644
> --- a/src/mesa/drivers/dri/intel/intel_tex_copy.c
> +++ b/src/mesa/drivers/dri/intel/intel_tex_copy.c
> @@ -62,6 +62,12 @@ intel_copy_texsubimage(struct intel_context *intel,
>
> intel_prepare_render(intel);
>
> + /* glCopyTexSubImage() can't be called on multisampled renderbuffers or
> + * textures.
> + */
> + assert(!irb->Base.Base.NumSamples);
> + assert(!intelImage->base.Base.NumSamples);
> +
> if (!intelImage->mt || !irb || !irb->mt) {
> if (unlikely(INTEL_DEBUG & DEBUG_PERF))
> fprintf(stderr, "%s fail %p %p (0x%08x)\n",
> --
> 1.8.3.rc0
>
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