added cava

.config/cava/shaders/normalized_bars.frag

@@ -0,0 +1,38 @@
+#version 330
+
+in vec2 fragCoord;
+out vec4 fragColor;
+
+// bar values. defaults to left channels first (low to high), then right (high to low).
+uniform float bars[512];
+
+uniform int bars_count;    // number of bars (left + right) (configurable)
+
+uniform vec3 u_resolution; // window resolution, not used here
+
+//colors, configurable in cava config file
+uniform vec3 bg_color; // background color(r,g,b) (0.0 - 1.0), not used here
+uniform vec3 fg_color; // foreground color, not used here
+
+float normalize_C(float x, float x_min, float x_max, float r_min, float r_max )
+{
+	float xr;
+	xr = (r_max-r_min) * (x - x_min) / (x_max - x_min) + r_min;
+	return xr;
+}
+
+void main()
+{
+    // find which bar to use based on where we are on the x axis
+    int bar = int(bars_count * fragCoord.x);
+
+    // create a normal along the y axis based on the bar height
+    float x = normalize_C(fragCoord.y, 1.0, 0.0, 0.0, bars[bar]);
+
+    // set color
+    fragColor.r=fg_color.x*x;
+    fragColor.g=fg_color.y*x;
+    fragColor.b=fg_color.z*x;
+    fragColor.a=1.0;
+
+}