From 5b4d80edadf21ca218204da0335b0dd903d1f307 Mon Sep 17 00:00:00 2001
From: oc1024 <carana2099@gmail.com>
Date: Wed, 23 Jan 2019 08:25:18 -0300
Subject: [PATCH] Added luma key effect

---
 effects/lumakey.frag | 21 +++++++++++++++++++++
 effects/lumakey.xml  | 10 ++++++++++
 2 files changed, 31 insertions(+)
 create mode 100644 effects/lumakey.frag
 create mode 100644 effects/lumakey.xml

diff --git a/effects/lumakey.frag b/effects/lumakey.frag
new file mode 100644
index 000000000..3e7b0d266
--- /dev/null
+++ b/effects/lumakey.frag
@@ -0,0 +1,21 @@
+/* Luma key simple program
+Based on Edward Cannon's Simple Chroma Key (adaptation by Olive Team)
+Feel free to modify and use at will */
+
+uniform sampler2D tex;
+varying vec2 vTexCoord;
+
+uniform float loc;
+uniform float hic;
+
+void main(void) {
+	vec4 texture_color = texture2D(tex,vTexCoord);
+
+	float luma = max(max(texture_color.r,texture_color.g), texture_color.b) + min(min(texture_color.r,texture_color.g), texture_color.b);
+	
+	luma /= 2.0;
+
+	texture_color.a = (luma >= loc && luma <= hic) ? luma : 0.0;
+	
+	gl_FragColor = texture_color; 
+}
\ No newline at end of file
diff --git a/effects/lumakey.xml b/effects/lumakey.xml
new file mode 100644
index 000000000..03b933877
--- /dev/null
+++ b/effects/lumakey.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<effect name="Luma Key" category="Keying">
+	<row name="Lower Limit">
+		<field type="double" min="0" default="0" max="1" id="loc"/>
+	</row>
+	<row name="Upper Limit">
+		<field type="double" min="0" default="1" max="1" id="hic"/>
+	</row>
+	<shader vert="common.vert" frag="lumakey.frag"/>
+</effect>
\ No newline at end of file