X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=ycbcr_conversion_effect.frag;h=ef289df8fa34dc35ddf74858d8a351227b96de12;hp=6bc29b1be63782bcd950f3dd451256a2caedb8f0;hb=90ac46cdc5845432df13385f946c63b5496c685e;hpb=80fc4a6e806e5638ae050c3020962137ca5fd76b

diff --git a/ycbcr_conversion_effect.frag b/ycbcr_conversion_effect.frag
index 6bc29b1..ef289df 100644
--- a/ycbcr_conversion_effect.frag
+++ b/ycbcr_conversion_effect.frag
@@ -1,24 +1,38 @@
+// See footer.frag for details about this if statement.
+#ifndef YCBCR_ALSO_OUTPUT_RGBA
+#define YCBCR_ALSO_OUTPUT_RGBA 0
+#endif
+
 uniform sampler2D PREFIX(tex_y);
 uniform sampler2D PREFIX(tex_cb);
 uniform sampler2D PREFIX(tex_cr);
 
+#if YCBCR_ALSO_OUTPUT_RGBA
+vec4[2] FUNCNAME(vec2 tc) {
+#else
 vec4 FUNCNAME(vec2 tc) {
+#endif
 	vec4 rgba = INPUT(tc);
 	vec4 ycbcr_a;
 
 	ycbcr_a.rgb = PREFIX(ycbcr_matrix) * rgba.rgb + PREFIX(offset);
 
-#if YCBCR_CLAMP_RANGE
-	// If we use limited-range Y'CbCr, the card's usual 0–255 clamping
-	// won't be enough, so we need to clamp ourselves here.
-	//
-	// We clamp before dither, which is a bit unfortunate, since
-	// it means dither can take us out of the clamped range again.
-	// However, since DitherEffect never adds enough dither to change
-	// the quantized levels, we will be fine in practice.
-	ycbcr_a.rgb = clamp(ycbcr_a.rgb, PREFIX(ycbcr_min), PREFIX(ycbcr_max));
-#endif
+	if (PREFIX(clamp_range)) {
+		// If we use limited-range Y'CbCr, the card's usual 0–255 clamping
+		// won't be enough, so we need to clamp ourselves here.
+		//
+		// We clamp before dither, which is a bit unfortunate, since
+		// it means dither can take us out of the clamped range again.
+		// However, since DitherEffect never adds enough dither to change
+		// the quantized levels, we will be fine in practice.
+		ycbcr_a.rgb = clamp(ycbcr_a.rgb, PREFIX(ycbcr_min), PREFIX(ycbcr_max));
+	}
 
 	ycbcr_a.a = rgba.a;
+
+#if YCBCR_ALSO_OUTPUT_RGBA
+	return vec4[2](ycbcr_a, rgba);
+#else
 	return ycbcr_a;
+#endif
 }