1 files changed, 34 insertions, 0 deletions
diff --git a/.config/cava/shaders/northern_lights.frag b/.config/cava/shaders/northern_lights.frag
new file mode 100644
index 0000000..ecd859a
--- /dev/null
+++ b/.config/cava/shaders/northern_lights.frag
@@ -0,0 +1,34 @@
+#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
+
+void main()
+{
+    // find which bar to use based on where we are on the x axis
+    int bar = int(bars_count * fragCoord.x);
+
+    float bar_y = 1.0 - abs((fragCoord.y - 0.5)) * 2.0;
+    float y = (bars[bar]) * bar_y;
+
+    float bar_x = (fragCoord.x - float(bar) / float(bars_count)) * bars_count;
+    float bar_r = 1.0 - abs((bar_x - 0.5)) * 2;
+
+    bar_r = bar_r * bar_r * 2;
+
+    // set color
+    fragColor.r = fg_color.x * y * bar_r;
+    fragColor.g = fg_color.y * y * bar_r;
+    fragColor.b = fg_color.z * y * bar_r;
+}