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intel: Support blitting to multiple color draw buffers
This patch enables blitting to multiple color attachments of a
framebuffer. It also fixes a case when blitting to a framebuffer with
renderbuffer/texture attached to non-zero attachment point
i.e. GL_COLOR_ATTACHMENT{1, 2, ...}. Earlier we were incorrectly
blitting to GL_COLOR_ATTACHMENT0 by default.
V2: Use intel_copy_texsubimage() for blitting only if all the color
attachments can blit using it.
Signed-off-by: Anuj Phogat <anuj.phogat@gmail.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>