1 files changed, 36 insertions, 0 deletions
diff --git a/01f.glsl b/01f.glsl
new file mode 100644
index 0000000..9baa911
--- /dev/null
+++ b/01f.glsl
@@ -0,0 +1,36 @@
+varying vec2 pos;
+uniform float u_aspect_ratio;
+
+vec2 rand(vec2 co) {
+    float random = 2920.0 * sin(co.x * 21942.0 + co.y * 171324.0 + 8912.0) * cos(co.x * 23157.0 * co.y * 217832.0 + 9758.0);
+    return vec2(cos(random), sin(random));
+}
+
+float dot_grid_gradient(vec2 floor_p, vec2 p) {
+	vec2 gradient = rand(floor_p);
+	vec2 dist = p - floor_p;
+	return dot(dist, gradient);
+}
+
+void main() {
+	vec2 p = pos * 10.0;
+	p.x *= u_aspect_ratio;
+	vec2 p0 = floor(p);
+	vec2 p1 = p0 + vec2(1.0, 1.0);
+	vec2 weight = p - p0;
+	weight = smoothstep(0.0, 1.0, weight);
+	
+	float n0 = dot_grid_gradient(vec2(p0.x, p0.y), p);
+	float n1 = dot_grid_gradient(vec2(p1.x, p0.y), p);
+	float ix0 = mix(n0, n1, weight.x);
+		
+	n0 = dot_grid_gradient(vec2(p0.x, p1.y), p);
+	n1 = dot_grid_gradient(vec2(p1.x, p1.y), p);
+	float ix1 = mix(n0, n1, weight.x);
+	
+	float v = mix(ix0, ix1, weight.y);
+	v += 1.0;
+	v *= 0.5;
+	vec3 color = mix(vec3(0.4, 0.2, 1.0), vec3(1.0, 0.6, 0.6), v);
+	gl_FragColor = vec4(color, 1.0);
+}