feat: Zoom XY Shader ( Fixes #199 )

Shaders/Zoom_XY.shader

@@ -0,0 +1,44 @@
+// Zoom XY Shader
+
+// A simple twist on the Zoom Shader in https://github.com/exeldro/obs-shaderfilter/
+
+// The allow for an independent Horizontal and Vertical Zoom.
+
+uniform int center_x_percent<
+    string label = "center x percent";
+    string widget_type = "slider";
+    int minimum = 0;
+    int maximum = 100;
+    int step = 1;
+> = 50;
+uniform int center_y_percent<
+    string label = "center y percent";
+    string widget_type = "slider";
+    int minimum = 0;
+    int maximum = 100;
+    int step = 1;
+> = 50;
+uniform float x_power<
+    string label = "x power";
+    string widget_type = "slider";
+    float minimum = 0;
+    float maximum = 20.0;
+    float step = 0.001;
+> = 1;
+
+uniform float y_power<
+    string label = "y power";
+    string widget_type = "slider";
+    float minimum = 0;
+    float maximum = 20.0;
+    float step = 0.001;
+> = 1;
+
+float4 mainImage(VertData v_in) : TARGET
+{
+    float2 center_pos = float2(center_x_percent * .01, center_y_percent * .01);
+    float2 uv = v_in.uv;
+    uv.x = (v_in.uv.x - center_pos.x) * x_power +  center_pos.x;
+    uv.y = (v_in.uv.y - center_pos.y) * y_power +  center_pos.y;
+    return image.Sample(textureSampler, uv);
+}