ez going

1 files changed, 26 insertions, 1 deletions

diff --git a/src/shader.frag b/src/shader.frag
index 7c5b0e7..cad317c 100644
--- a/src/shader.frag
+++ b/src/shader.frag
@@ -1,9 +1,34 @@
 #version 450
 
 layout(location = 0) in vec3 fragColor;
+layout(location = 1) in vec2 fragPos;
 
 layout(location = 0) out vec4 outColor;
 
+// void main() {
+//     outColor = vec4(fragColor, 1.0);
+// }
+vec3 mandel(vec2 z0) {
+    float k = 0.0;
+    vec2 z = vec2(0.0);
+    for(int i = 0; i < 420; ++i) {
+        z = vec2(z.x*z.x-z.y*z.y, z.x*z.y*2.0) + z0;
+        if (length(z) > 20.0) break;
+        k += 1.0;
+    }
+    float mu = k + 1.0 - log2(log(length(z)));
+    return sin(mu*0.1 + vec3(0.0,0.5,1.0));
+}
 void main() {
-    outColor = vec4(fragColor, 1.0);
+    float ar = fragPos.x / fragPos.y;
+    vec2 uv = gl_FragCoord.xy / fragPos.yy - vec2(0.66 * ar, 0.5);
+    //uv = uv * 2.0 + vec2(-0.3, 1.0);
+    float p = 30.0;
+    float t = mod(13.0, p);
+    if (t > p/2.0) t = p - t;
+    float scale = 0.5 + pow(4.0, t);
+    vec2 offset = vec2(-1.36799, .01);
+    uv += offset*scale;
+    uv /= scale;
+    outColor = vec4(mandel(uv), 1.0);
 }