1 files changed, 68 insertions, 0 deletions

diff --git a/assets/shaders/Paris.frag.glsl b/assets/shaders/Paris.frag.glsl
new file mode 100644
index 00000000..690b1453
--- /dev/null
+++ b/assets/shaders/Paris.frag.glsl
@@ -0,0 +1,68 @@
+#ifdef GL_ES
+precision highp float;
+#endif
+
+uniform sampler2D u_tex0;
+uniform float u_time;
+uniform vec2 u_resolution;
+const float PI = 3.1415926535897932;
+
+//speed
+
+const float speed = 0.1;
+const float speed_x = 0.075;
+const float speed_y = 0.000;
+
+// geometry
+const float intensity = 1.5;
+const int steps = 8;
+//const float frequency = 4.0;
+const float frequency = 2.0;
+const int angle = 7; // better when a prime
+
+// reflection and emboss
+const float delta = 20.;
+const float intence = 400.;
+const float emboss = 0.3;
+
+//---------- crystals effect
+
+  float col(vec2 coord)
+  {
+    float delta_theta = 2.0 * PI / float(angle);
+    float col = 0.0;
+    float theta = 0.0;
+    for (int i = 0; i < steps; i++)
+    {
+      vec2 adjc = coord;
+      theta = delta_theta*float(i);
+      adjc.x += cos(theta)*u_time*speed + u_time * speed_x;
+      adjc.y -= sin(theta)*u_time*speed - u_time * speed_y;
+      col = col + cos( (adjc.x*cos(theta) - adjc.y*sin(theta))*frequency)*intensity;
+    }
+
+    return cos(col);
+  }
+
+//---------- main
+
+void main(void)
+{
+vec2 p = (gl_FragCoord.xy) / u_resolution.xy, c1 = p, c2 = p;
+float cc1 = col(c1);
+
+c2.x += u_resolution.x/delta;
+float dx = emboss*(cc1-col(c2))/delta;
+
+c2.x = p.x;
+c2.y += u_resolution.y/delta;
+float dy = emboss*(cc1-col(c2))/delta;
+
+c1.x += dx;
+c1.y = -(c1.y+dy);
+
+float alpha = 1.+dot(dx,dy)*intence;
+gl_FragColor = texture2D(u_tex0,c1)*(alpha);
+// gl_FragColor = vec4(col(p),0,0,1);
+
+}