X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=ycbcr_input.frag;fp=ycbcr_input.frag;h=13e44b071398b986bb2a9037f27fed2016a65645;hb=9dcbd93164611ea111cc29519c18193d4f571ac1;hp=0000000000000000000000000000000000000000;hpb=ef82f39846c48a654b63797b78bf8b0b8935d348;p=movit

diff --git a/ycbcr_input.frag b/ycbcr_input.frag
new file mode 100644
index 0000000..13e44b0
--- /dev/null
+++ b/ycbcr_input.frag
@@ -0,0 +1,23 @@
+uniform sampler2D PREFIX(tex_y);
+uniform sampler2D PREFIX(tex_cb);
+uniform sampler2D PREFIX(tex_cr);
+
+vec4 FUNCNAME(vec2 tc) {
+	// OpenGL's origin is bottom-left, but most graphics software assumes
+	// a top-left origin. Thus, for inputs that come from the user,
+	// we flip the y coordinate.
+	tc.y = 1.0 - tc.y;
+
+	vec3 ycbcr;
+	ycbcr.x = texture2D(PREFIX(tex_y), tc).x;
+	ycbcr.y = texture2D(PREFIX(tex_cb), tc + PREFIX(chroma_offset)).x;
+	ycbcr.z = texture2D(PREFIX(tex_cr), tc + PREFIX(chroma_offset)).x;
+
+	ycbcr -= PREFIX(offset);
+	ycbcr *= PREFIX(scale);
+
+	vec4 rgba;
+	rgba.rgb = PREFIX(inv_ycbcr_matrix) * ycbcr;
+	rgba.a = 1.0;
+	return rgba;
+}