1 // See footer.frag for details about this if statement.
2 #ifndef YCBCR_ALSO_OUTPUT_RGBA
3 #define YCBCR_ALSO_OUTPUT_RGBA 0
6 #if YCBCR_ALSO_OUTPUT_RGBA
7 vec4[2] FUNCNAME(vec2 tc) {
9 vec4 FUNCNAME(vec2 tc) {
11 vec4 rgba = INPUT(tc);
14 ycbcr_a.rgb = PREFIX(ycbcr_matrix) * rgba.rgb + PREFIX(offset);
16 if (PREFIX(clamp_range)) {
17 // If we use limited-range Y'CbCr, the card's usual 0–255 clamping
18 // won't be enough, so we need to clamp ourselves here.
20 // We clamp before dither, which is a bit unfortunate, since
21 // it means dither can take us out of the clamped range again.
22 // However, since DitherEffect never adds enough dither to change
23 // the quantized levels, we will be fine in practice.
24 ycbcr_a.rgb = clamp(ycbcr_a.rgb, PREFIX(ycbcr_min), PREFIX(ycbcr_max));
29 #if YCBCR_ALSO_OUTPUT_RGBA
30 return vec4[2](ycbcr_a, rgba);