Setup terrains system

scripts/shaders/Scanner.gdshader

@@ -0,0 +1,48 @@
+shader_type canvas_item;
+
+#define pow2(x) (x * x)
+#define iResolution 1.0/SCREEN_PIXEL_SIZE
+
+uniform sampler2D gradient : source_color, filter_nearest; 
+uniform int dimension;
+
+const float alpha = 0.3;
+const float strength = 0.5;
+const float pi = atan(1.0) * 4.0;
+const int samples = 35;
+const float sigma = float(samples) * 0.25;
+
+float gaussian(vec2 i) {
+    return 1.0 / (2.0 * pi * pow(sigma,2)) * exp(-((pow(i.x,2) + pow(i.y,2)) / (2.0 * pow(sigma,2))));
+}
+
+vec3 blur(sampler2D sp, vec2 uv, vec2 scale) {
+    vec3 col = vec3(0.0);
+    float accum = 0.0;
+    float weight;
+    vec2 offset;
+    
+    for (int x = -samples / 2; x < samples / 2; ++x) {
+        for (int y = -samples / 2; y < samples / 2; ++y) {
+            offset = vec2(float(x), float(y));
+            weight = gaussian(offset);
+            col += texture(sp, uv + scale * offset).rgb * weight;
+            accum += weight;
+        }
+    }
+    
+    return col / accum;
+}
+
+void fragment() {
+	vec2 ps = vec2(1.0) / iResolution.xy * .000001 * strength;
+    vec2 uv = UV ;
+	
+	vec3 pixel_color = blur(TEXTURE, uv, ps );
+	float value = pixel_color.x;
+	if (dimension == 1) value = pixel_color.y;
+	if (dimension == 2) value = pixel_color.z;
+	
+	COLOR = texture(gradient, vec2(value, 0));
+	COLOR.a = alpha;
+}