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In GLES2, we cannot do GL_RED or GL_RG without GL_EXT_texture_rg. So, add check for GL_EXT_texture_rg to make it working. Also add a yuv2 pixman format into render.h to make Xv yuv rendering works. Signed-off-by: Yuriy Vasilev <uuvasiliev@yandex.ru> Reviewed-by: Adam Jackson <ajax@redhat.com> Reviewed-by: Emma Anholt <emma@anholt.net>