X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=futatabi%2Fgray.frag;fp=futatabi%2Fgray.frag;h=57a6891c4b7032ff48d4760b3b7c45aff5924373;hb=6e116a6bbeb2c047a3bfb084395ec601ce211e6c;hp=0000000000000000000000000000000000000000;hpb=ce2e0615420b706e1ff2405fffcedfba37a9adac;p=nageru

diff --git a/futatabi/gray.frag b/futatabi/gray.frag
new file mode 100644
index 0000000..57a6891
--- /dev/null
+++ b/futatabi/gray.frag
@@ -0,0 +1,13 @@
+#version 450 core
+
+in vec3 tc;
+out vec4 gray;
+
+uniform sampler2DArray tex;
+
+void main()
+{
+	vec4 color = texture(tex, tc);
+	gray.rgb = vec3(dot(color.rgb, vec3(0.2126f, 0.7152f, 0.0722f)));  // Rec. 709.
+	gray.a = color.a;
+}