Add cardioid fractal shader code

Author: Youngermaster

cardioid.glsl

@@ -0,0 +1,40 @@
+#version 430
+
+out vec4 fragColor;
+
+uniform vec2 resolution;
+uniform float time;
+
+vec2 rotate2D(vec2 uv, float a) {
+    float s = sin(a);
+    float c = cos(a);
+    return mat2(c, -s, s, c) * uv;
+}
+
+vec2 hash12(float t) {
+    float x = fract(sin(t * 3453.329));
+    float y = fract(sin((t + x) * 8532.732));
+    return vec2(x, y);
+}
+
+void main() {
+    vec2 uv = (gl_FragCoord.xy - 0.5 * resolution.xy) / resolution.y;
+    vec3 col = vec3(0.0);
+
+    uv = rotate2D(uv, 3.14 / 2.0);
+
+    float r = 0.17;
+    for (float i=0.0; i < 60.0; i++) {
+        float factor = (sin(time) * 0.5 + 0.5) + 0.3;
+        i += factor;
+
+        float a = i / 3;
+        float dx = 2 * r * cos(a) - r * cos(2 * a);
+        float dy = 2 * r * sin(a) - r * sin(2 * a);
+
+        col += 0.013 * factor / length(uv - vec2(dx + 0.1, dy) - 0.02 * hash12(i));
+    }
+    col *= sin(vec3(0.2, 0.8, 0.9) * time) * 0.15 + 0.25;
+
+    fragColor = vec4(col, 1.0);
+}

main.py

@@ -2,7 +2,10 @@
 
 shape("turtle")
 speed(-5)
-
+bgcolor("white")
+penup()
+goto(0, -180)  # Move the turtle to a starting position
+pendown()
 
 def tree(size, levels, angle):
     if levels == 0:
@@ -23,7 +26,6 @@ def tree(size, levels, angle):
     right(angle)
     backward(size)
 
-
 def snowflake_side(length, levels):
     if levels == 0:
         forward(length)
@@ -38,18 +40,26 @@ def snowflake_side(length, levels):
     left(60)
     snowflake_side(length, levels - 1)
 
-
 def create_snowflake(sides, length):
     colors = ["green", "blue", "yellow", "orange"]
     for i in range(sides):
         color(colors[i])
         snowflake_side(length, sides)
         right(360 / sides)
 
+create_snowflake(4, 200)
 
-# left(90)
-# tree(70, 7, 30)
+# Hide the turtle after drawing the snowflake
+hideturtle()
 
-create_snowflake(4, 200)
+# Move to the center and write "OmegaHack 2024"
+penup()
+goto(0, 0)
+color("black")
+write("OmegaHack 2024", align="center", font=("Arial", 24, "bold"))
+
+# Move down a bit and write "DSI"
+goto(0, -30)
+write("DSI", align="center", font=("Arial", 18, "bold"))
 
 mainloop()