1 files changed, 72 insertions, 0 deletions
diff --git a/src/graphics/shaders/huesat.frag b/src/graphics/shaders/huesat.frag
new file mode 100644
index 0000000..381b5b2
--- /dev/null
+++ b/src/graphics/shaders/huesat.frag
@@ -0,0 +1,72 @@
+//
+//  libavg - Media Playback Engine. 
+//  Copyright (C) 2003-2011 Ulrich von Zadow
+//
+//  This library is free software; you can redistribute it and/or
+//  modify it under the terms of the GNU Lesser General Public
+//  License as published by the Free Software Foundation; either
+//  version 2 of the License, or (at your option) any later version.
+//
+//  This library is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+//  Lesser General Public License for more details.
+//
+//  You should have received a copy of the GNU Lesser General Public
+//  License along with this library; if not, write to the Free Software
+//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//
+//  Current versions can be found at www.libavg.de
+//
+
+const vec3 lumCoeff = vec3(0.2125, 0.7154, 0.0721);
+const vec3 white = vec3(1.0, 1.0, 1.0);
+const vec3 black = vec3(0.0, 0.0, 0.0);
+
+uniform sampler2D u_Texture;
+uniform float u_Hue;
+uniform float u_Sat;
+uniform float u_LightnessOffset;
+uniform bool u_bColorize;
+
+#ifndef FRAGMENT_ONLY
+varying vec2 v_TexCoord;
+varying vec4 v_Color;
+#endif
+
+#include "helper.frag"            
+
+void main(void)
+{
+    float tmp;
+    float s;
+    float l;
+    float h;
+    vec4 tex = texture2D(u_Texture, v_TexCoord);
+    unPreMultiplyAlpha(tex);
+    rgb2hsl(tex, tmp, s, l);
+    if (u_bColorize) {
+       h = u_Hue;
+       s = u_Sat;
+    } else {
+       h = u_Hue+tmp;
+    }
+    vec4 rgbTex = vec4(hsl2rgb(mod(h, 360.0), s, l), tex.a);
+
+    // Saturate in rgb - space to imitate photoshop filter
+    if (!u_bColorize) { 
+      s = clamp(u_Sat+s, 0.0, 2.0);
+      vec3 intensity = vec3(dot(rgbTex.rgb, lumCoeff));
+      rgbTex.rgb = mix(intensity, rgbTex.rgb, s);
+    }
+
+    // Brightness with black/white pixels to imitate photoshop lightness-offset
+    if (u_LightnessOffset >= 0.0) { 
+       rgbTex = vec4(mix(rgbTex.rgb, white, u_LightnessOffset), tex.a);
+    } else if (u_LightnessOffset < 0.0) { 
+       rgbTex = vec4(mix(rgbTex.rgb, black, -u_LightnessOffset), tex.a);
+    }
+
+    preMultiplyAlpha(rgbTex);
+    gl_FragColor = rgbTex;
+}