some new things, mostly not working or finished

math/mandelbrot.hlsl

@@ -0,0 +1,24 @@
+cbuffer ViewportBuffer : register(b0)
+{
+    float xmin;
+    float xmax;
+    float ymin;
+    float ymax;
+    int max_iter;
+};
+
+struct PS_IN { float4 pos : SV_POSITION; };
+
+float4 PSMain(PS_IN input) : SV_TARGET
+{
+    float2 uv = input.pos.xy * 0.5 + 0.5; // [-1,1] -> [0,1]
+    float2 c = float2(xmin,ymin) + uv * float2(xmax-xmin, ymax-ymin);
+    float2 z = c;
+    int i;
+    for(i=0;i<max_iter;i++){
+        if(dot(z,z)>4) break;
+        z = float2(z.x*z.x - z.y*z.y, 2*z.x*z.y)+c;
+    }
+    float t = i/(float)max_iter;
+    return float4(t,0.5*t,1.0-t,1);
+}