port from perforce

hgplus/ShaderMinifier/tests/real/deform.frag

@@ -0,0 +1,27 @@
+uniform float time;
+uniform vec2 resolution;
+uniform vec4 mouse;
+uniform sampler2D tex0;
+uniform sampler2D tex1;
+uniform sampler2D tex2;
+uniform sampler2D tex3;
+
+void main(void)
+{
+    vec2 p = -1.0 + 2.0 * gl_FragCoord.xy / resolution.xy;
+    vec2 m = -1.0 + 2.0 * mouse.xy / resolution.xy;
+
+    float a1 = atan(p.y-m.y,p.x-m.x);
+    float r1 = sqrt(dot(p-m,p-m));
+    float a2 = atan(p.y+m.y,p.x+m.x);
+    float r2 = sqrt(dot(p+m,p+m));
+
+    vec2 uv;
+    uv.x = 0.2*time + (r1-r2)*0.25;
+    uv.y = sin(2.0*(a1-a2));
+
+    float w = r1*r2*0.8;
+    vec3 col = texture2D(tex0,uv).xyz;
+
+    gl_FragColor = vec4(col/(.1+w),1.0);
+}