ycbcr.y = tex2D(PREFIX(tex_cbcr), tc + PREFIX(cb_offset)).x;
ycbcr.z = tex2D(PREFIX(tex_cbcr), tc + PREFIX(cr_offset)).x;
ycbcr.y = tex2D(PREFIX(tex_cbcr), tc + PREFIX(cb_offset)).x;
ycbcr.z = tex2D(PREFIX(tex_cbcr), tc + PREFIX(cr_offset)).x;
ycbcr.y = tex2D(PREFIX(tex_cb), tc + PREFIX(cb_offset)).x;
ycbcr.z = tex2D(PREFIX(tex_cr), tc + PREFIX(cr_offset)).x;
ycbcr.y = tex2D(PREFIX(tex_cb), tc + PREFIX(cb_offset)).x;
ycbcr.z = tex2D(PREFIX(tex_cr), tc + PREFIX(cr_offset)).x;