Merge pull request #358 from oc1024/master

Extra Keying Effects I: Luma Key and Color Selector

effects/colorsel.frag

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+/* Filter by color characteristic simple program
+Based on Edward Cannon's Simple Chroma Key (adaptation by Olive Team)
+RGB to HSV based on MattKC's toonify source code
+Feel free to modify and use at will */
+#version 110
+
+uniform sampler2D tex;
+varying vec2 vTexCoord;
+
+uniform float loc;
+uniform float hic;
+uniform int compo;
+uniform bool invert;
+
+float rgb2luma(vec3 c) {
+    return (max(max(c.r,c.g), c.b) + min(min(c.r,c.g), c.b))/2.0;
+}
+
+vec3 rgb2hsv(vec3 c) 
+{
+     float r = c.r;
+     float b = c.b;
+     float g = c.g;
+	 float minv, maxv, delta;
+	 vec3 res;
+
+	 minv = min(min(r, g), b);
+	 maxv = max(max(r, g), b);
+	 res.z = maxv;            // v
+	 
+	 delta = maxv - minv;
+
+	 if( maxv != 0.0 )
+			res.y = delta / maxv;      // s
+	 else {
+			// r = g = b = 0      // s = 0, v is undefined
+			res.y = 0.0;
+			res.x = -1.0;
+			return res;
+	 }
+
+	 if( r == maxv )
+			res.x = ( g - b ) / delta;      // between yellow & magenta
+	 else if( g == maxv )
+			res.x = 2.0 + ( b - r ) / delta;   // between cyan & yellow
+	 else
+			res.x = 4.0 + ( r - g ) / delta;   // between magenta & cyan
+
+	 res.x = res.x * 60.0;            // degrees
+	 if( res.x < 0.0 )
+			res.x = res.x + 360.0;
+			
+	 return res;
+}
+
+bool isNotIncreasingSequence(float a, float b, float c) {
+    return (c < b || a > b);
+}
+
+void main(void) {
+	vec4 texture_color = texture2D(tex,vTexCoord);
+    vec3 color = texture_color.rgb;
+    float toCheck = 0.0;
+    
+	if (compo == 0) {
+            toCheck = rgb2luma(color)*100.0;
+    } else if (compo == 4) {
+            toCheck = color.r*100.0;
+    } else if (compo == 5) {
+            toCheck = color.g*100.0;
+    } else if (compo == 6) {
+            toCheck = color.b*100.0;
+    } else if (compo == 1) {
+            toCheck = rgb2hsv(color).z*100.0;
+    } else if (compo == 2) {
+            toCheck = rgb2hsv(color).x/3.6;
+    } else if (compo == 3) {
+            toCheck = rgb2hsv(color).y*100.0;
+    }
+	texture_color.a = isNotIncreasingSequence(loc, toCheck, hic) ? (invert ? texture_color.a : 0.0) : (invert ? 0.0 : texture_color.a);
+	texture_color.rgb *= texture_color.a;
+	gl_FragColor = texture_color;
+}

effects/colorsel.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<effect name="Color Finder" category="Keying">
+    <row name="Find by">
+        <field type="combo" default="0" id="compo">
+			<option>Luminance</option>
+            <option>Value</option>
+            <option>Hue</option>
+            <option>Saturation</option>
+            <option>Red</option>
+			<option>Green</option>
+			<option>Blue</option>
+		</field>
+    </row>
+	<row name="Lower Limit">
+		<field type="double" min="0" default="0" max="100" id="loc"/>
+	</row>
+	<row name="Upper Limit">
+		<field type="double" min="0" default="100" max="100" id="hic"/>
+	</row>
+    <row name="Invert">
+		<field type="bool" min="0" default="100" max="100" id="invert"/>
+	</row>
+	<shader vert="common.vert" frag="colorsel.frag"/>
+</effect>

effects/lumakey.frag

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+/* 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;
+uniform bool invert;
+
+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;
+
+	if (luma > hic/100.0) {
+        texture_color.a = (invert ? 0.0 : 1.0);
+    } else if (luma < loc/100.0) {
+        texture_color.a = (invert ? 1.0 : 0.0);
+    } else {
+        texture_color.a = (invert ? 1.0-luma : luma);
+    }
+	
+	texture_color.rgb *= texture_color.a;
+	gl_FragColor = texture_color; 
+}

effects/lumakey.xml

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+<?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="100" id="loc"/>
+	</row>
+	<row name="Upper Limit">
+		<field type="double" min="0" default="100" max="100" id="hic"/>
+	</row>
+        <row name="Invert">
+		<field type="bool" min="0" default="100" max="100" id="invert"/>
+	</row>
+	<shader vert="common.vert" frag="lumakey.frag"/>
+</effect>