X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;ds=sidebyside;f=ycbcr_conversion_effect.frag;fp=ycbcr_conversion_effect.frag;h=6bc29b1be63782bcd950f3dd451256a2caedb8f0;hb=80fc4a6e806e5638ae050c3020962137ca5fd76b;hp=0000000000000000000000000000000000000000;hpb=5f81c29e307735bbadb3c0cb06500af627b2e57a;p=movit

diff --git a/ycbcr_conversion_effect.frag b/ycbcr_conversion_effect.frag
new file mode 100644
index 0000000..6bc29b1
--- /dev/null
+++ b/ycbcr_conversion_effect.frag
@@ -0,0 +1,24 @@
+uniform sampler2D PREFIX(tex_y);
+uniform sampler2D PREFIX(tex_cb);
+uniform sampler2D PREFIX(tex_cr);
+
+vec4 FUNCNAME(vec2 tc) {
+	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
+
+	ycbcr_a.a = rgba.a;
+	return ycbcr_a;
+}