1 files changed, 54 insertions, 0 deletions
diff --git a/src/graphics/shaders/vertshadow.frag b/src/graphics/shaders/vertshadow.frag
new file mode 100644
index 0000000..bed8376
--- /dev/null
+++ b/src/graphics/shaders/vertshadow.frag
@@ -0,0 +1,54 @@
+//
+//  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
+//
+
+uniform float u_Width;
+uniform int u_Radius;
+uniform sampler2D u_KernelTex;
+uniform sampler2D u_HBlurTex;
+uniform sampler2D u_OrigTex;
+uniform vec4 u_Color;
+uniform vec2 u_DestPos;
+uniform vec2 u_DestSize;
+
+#ifndef FRAGMENT_ONLY
+varying vec2 v_TexCoord;
+varying vec4 v_Color;
+#endif
+
+void main(void)
+{
+    float sum = 0.;
+    float dy = dFdy(v_TexCoord.y);
+    for (int i=-u_Radius; i<=u_Radius; ++i) {
+        float a = texture2D(u_HBlurTex,
+                v_TexCoord+vec2(0,float(i)*dy)).a;
+        float coeff = 
+                texture2D(u_KernelTex, vec2((float(i+u_Radius)+0.5)/u_Width,0)).r;
+        sum += a*coeff;
+    }
+    sum = min(1., sum);
+    vec2 origCoord = v_TexCoord;
+    origCoord = u_DestPos + 
+            vec2(origCoord.s*u_DestSize.x, origCoord.t*u_DestSize.y);
+    vec4 origCol = texture2D(u_OrigTex, origCoord);
+    gl_FragColor = origCol+(1.-origCol.a)*u_Color*sum;
+}
+