From 67dd4bdd47a0324507bed232d22068aa198549fe Mon Sep 17 00:00:00 2001
From: hwc487
Date: Wed, 11 Jul 2012 09:48:19 -0700
Subject: re-wrote the radial blur shader.  Changed tolerances in the
 deformation shaders.

---
 assets/shaders/radialBlur.frag.glsl | 81 +++++++++++++++++++++++++------------
 1 file changed, 55 insertions(+), 26 deletions(-)

(limited to 'assets/shaders/radialBlur.frag.glsl')

diff --git a/assets/shaders/radialBlur.frag.glsl b/assets/shaders/radialBlur.frag.glsl
index c4520e58..953e6f07 100644
--- a/assets/shaders/radialBlur.frag.glsl
+++ b/assets/shaders/radialBlur.frag.glsl
@@ -1,46 +1,75 @@
 
+/* <copyright>
+Copyright (c) 2012, Motorola Mobility LLC.
+All Rights Reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice,
+  this list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+* Neither the name of Motorola Mobility LLC nor the names of its
+  contributors may be used to endorse or promote products derived from this
+  software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+</copyright> */
+
+#ifdef GL_ES
 precision highp float;
+#endif
 
 uniform vec2 u_resolution;
 uniform float u_time;
 uniform float u_speed;
 uniform sampler2D u_tex0;
 
-vec3 deform( in vec2 p )
-{
-    vec2 uv;
-
-	float time = u_time * u_speed;
-    vec2 q = vec2( sin(1.1*time+p.x),sin(1.2*time+p.y) );
-
-    float a = atan(q.y,q.x);
-    float r = sqrt(dot(q,q));
-
-    uv.x = sin(0.0+1.0*time)+p.x*sqrt(r*r+1.0);
-    uv.y = sin(0.6+1.1*time)+p.y*sqrt(r*r+1.0);
-
-    return texture2D(u_tex0,uv*.5).xyz;
-}
 
 void main(void)
 {
     vec2 p = -1.0 + 2.0 * gl_FragCoord.xy / u_resolution.xy;
-    //vec2 p = -1.0 + 2.0 * gl_FragCoord.xy / vec2(500,500).xy;
     vec2 s = p;
 
-    vec3 total = vec3(0.0);
-    vec2 d = (vec2(0.0,0.0)-p)/40.0;
-    float w = 1.0;
-    for( int i=0; i<40; i++ )
+	float time = u_time * u_speed;
+    float c1 = 1.1*time,  c2 = 1.2*time,  c3 = 0.6+1.1*time;
+    float sc3 = sin(c3),  st = sin(time);
+
+    const float iterCount = 40.0;
+    const int iIterCount = int( iterCount );
+    
+    vec3 sum = vec3(0.0);
+    vec2 delta = -p/iterCount;
+    vec2 uv;
+    for( int i=0; i<iIterCount; i++ )
     {
-        vec3 res = deform(s);
+        vec2 q = vec2( sin(c1 + s.x), sin(c2 + s.y) );
+        float a = atan(q.y,q.x);
+        float rsq = abs(dot(q,q)) + 1.0;
+        uv.x =  st + s.x*rsq;
+        uv.y = sc3 + s.y*rsq;
+        vec3 res = texture2D(u_tex0, uv*.5).xyz;
+
         res = smoothstep(0.1,1.0,res*res);
-        total += w*res;
-        w *= .99;
-        s += d;
+        sum += res;
+        s += delta;
     }
-    total /= 40.0;
+    sum /= iterCount;
     float r = 1.5/(1.0+dot(p,p));
 
-    gl_FragColor = vec4( total*r,1.0);
+    gl_FragColor = vec4( sum*r, 1.0);
 }
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