X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=futatabi%2Fchroma_subsample.vert;fp=futatabi%2Fchroma_subsample.vert;h=81e1004049c375b1dcfaba22bf32dadc0f3b53b2;hb=6e116a6bbeb2c047a3bfb084395ec601ce211e6c;hp=0000000000000000000000000000000000000000;hpb=ce2e0615420b706e1ff2405fffcedfba37a9adac;p=nageru

diff --git a/futatabi/chroma_subsample.vert b/futatabi/chroma_subsample.vert
new file mode 100644
index 0000000..81e1004
--- /dev/null
+++ b/futatabi/chroma_subsample.vert
@@ -0,0 +1,21 @@
+#version 450 core
+
+layout(location=0) in vec2 position;
+out vec2 tc0, tc1;
+uniform vec2 chroma_offset_0;
+uniform vec2 chroma_offset_1;
+
+void main()
+{
+	// The result of glOrtho(0.0, 1.0, 0.0, 1.0, 0.0, 1.0) is:
+	//
+	//   2.000  0.000  0.000 -1.000
+	//   0.000  2.000  0.000 -1.000
+	//   0.000  0.000 -2.000 -1.000
+	//   0.000  0.000  0.000  1.000
+	gl_Position = vec4(2.0 * position.x - 1.0, 2.0 * position.y - 1.0, -1.0, 1.0);
+	vec2 flipped_tc = position;
+	tc0 = flipped_tc + chroma_offset_0;
+	tc1 = flipped_tc + chroma_offset_1;
+}
+