X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=overlay_effect.frag;h=d32cc062204c4492dbb552c6930908e2f8b805be;hp=9e5709d1dad6271535701316d4ff1b60c4533d99;hb=f0d64ec5bf2e3ccfc20d7cfe8a6843b32d07ffad;hpb=756e3ceaca8c190a9e7c310272c1c6a0e41c9999

diff --git a/overlay_effect.frag b/overlay_effect.frag
index 9e5709d..d32cc06 100644
--- a/overlay_effect.frag
+++ b/overlay_effect.frag
@@ -13,7 +13,15 @@
 // C_o without the division by alpha_o).
 
 vec4 FUNCNAME(vec2 tc) {
+// SWAP_INPUTS will be #defined to 1 if we want to swap the two inputs,
+#if SWAP_INPUTS
+	vec4 bottom = INPUT2(tc);
+	vec4 top = INPUT1(tc);
+#else
 	vec4 bottom = INPUT1(tc);
 	vec4 top = INPUT2(tc);
+#endif
 	return top + (1.0 - top.a) * bottom;
 }
+
+#undef SWAP_INPUTS