Make glpaper work

custom-files/sway/selen.frag

@@ -0,0 +1,73 @@
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+#ifdef GLSLVIEWER 
+uniform float u_time;
+uniform vec2 u_resolution;
+#endif
+#ifndef GLSLVIEWER
+uniform float time;
+uniform vec2 resolution;
+#endif
+
+// Control variables
+const float scale_factor = 0.55;
+const float squish_factor = 3.0;
+const float time_factor = -0.025;
+const float dim_factor = 0.2;
+
+vec4 simpleAlphaCompositing (vec4 source, vec4 backdrop) {
+	float final_alpha = source.a + backdrop.a * (1.0 - source.a);
+	return vec4(
+		(source.rgb * source.a + backdrop.rgb * backdrop.a * (1.0 - source.a)) / final_alpha,
+		final_alpha
+	);
+}
+
+
+vec4 getColor(vec4 input_color, float speed, float freq, float amp, vec2 uv, float phase_offset) {
+#ifdef GLSLVIEWER
+  float time = u_time;
+#endif
+  float y = uv.y + (time * time_factor * speed);
+  float d = uv.x - amp * scale_factor * sin(phase_offset + y * squish_factor * freq);
+  float value = clamp((0.01 / (d * d)) * dim_factor, 0.0, 1.0);
+  input_color.a = value;
+  return input_color;
+}
+
+void main( void ) {
+#ifdef GLSLVIEWER
+        float time = u_time;
+        vec2 resolution = u_resolution;
+#endif
+        vec2 uv = (gl_FragCoord.xy * 2. - resolution) / resolution.y;
+	float tmp_x = uv.x;
+	float tmp_y = uv.y;
+	uv.x = tmp_y;
+	uv.y = tmp_x;
+	vec4 background = vec4((24.0/255.0), (73.0/255.0), (86.0/255.0), 0.0);
+        vec4 colors[3];
+        colors[0] = vec4((250.0/255.0), (87.0/255.0), (80.0/255.0), 0.0);
+        colors[1] = vec4((117.0/255.0),(185.0/255.0),(56.0/255.0), 0.0);
+        colors[2] = vec4((70.0/255.0),(149.0/255.0),(247.0/255.0),0.0);
+	// Relative travel speeds
+        vec3 speeds = vec3(1.0, 1.2, 0.8);
+	// Relative frequency
+        vec3 freqs = vec3(1.0, 1.2, 0.8);
+	// Relative amplitude
+        vec3 amps = vec3(1.0, 1.5, 0.5);
+	// Generate the color maps
+        for (int i = 0; i < 3; i++) {
+          colors[i] = getColor(colors[i], speeds[i], freqs[i], amps[i], uv, 0.0);
+          background.a += colors[i].a;
+        }
+	// Mix the colors
+	background.a = 1.0 - clamp(background.a, 0.0, 1.0);
+	vec4 color = simpleAlphaCompositing(colors[0], vec4(0.0, 0.0, 0.0, 1.0));
+	color = simpleAlphaCompositing(colors[1], color);
+	color = simpleAlphaCompositing(colors[2], color);
+	vec4 result = simpleAlphaCompositing(background, color);
+	gl_FragColor = result;
+}

machines/levitation.nix

@@ -44,6 +44,12 @@
           subpixel = "rgb";
         };
       };
+      startup = [
+        # GLPaper
+        { command = "glpaper DP-1 ${../custom-files/sway/selen.frag} --fork"; }
+        { command = "glpaper DP-3 ${../custom-files/sway/selen.frag} --fork"; }
+        { command = "glpaper HDMI-A-1 ${../custom-files/sway/selen.frag} --fork"; }
+      ];
     };
     # Mako output configuration
     programs.mako = {

modules/sway.nix

@@ -148,11 +148,14 @@
               # Clpy entire output to clipboard
               "${modifer}+Alt+x" = "exec ${pkgs.sway-contrib.grimshot}/bin/grimshot copy output";
             };
+          # Startup applications
+          startup = [
+            # Albert, the launcher
+            { command = "albert"; }
+            # Mako, the notification daemon
+            { command = "mako"; }
+          ];
         };
-        extraConfig = ''
-          exec albert
-          exec mako
-        '';
       };
       # Mako for notifications
       programs.mako = {