Install glpaper for our wallpaper

- glpaper is a background program that lets us use a glsl shader as our
  wallpaper
- we'll only use it on eDP-1, as in my experience using it on my 4k monitor
  slows my system too much
diff --git a/modules/glpaper/shader.glsl b/modules/glpaper/shader.glsl
new file mode 100644
index 0000000..c0ac9ed
--- /dev/null
+++ b/modules/glpaper/shader.glsl
@@ -0,0 +1,53 @@
+#extension GL_OES_standard_derivatives : enable
+
+precision highp float;
+
+uniform float time;
+uniform vec2 mouse;
+uniform vec2 resolution;
+
+vec3 white = vec3(1, 1, 1);
+vec3 amaranth_pink = vec3(0.945, 0.612, 0.733);
+vec3 maya_blue = vec3(0.298, 0.624, 0.886);
+
+vec3 color_for_position (vec2 position) {
+	vec3 color = white;
+	
+	if (sin(position.x + time / 30.0) / 2.0 - position.y + 0.4 < 0.0) {
+		color = amaranth_pink;
+	} else if (sin(position.x / 5.0 + time / 21.0 + 20.0) / 2.0 - position.y + 0.5 < 0.0) {
+		color = maya_blue;
+	}
+
+	return color;
+}
+
+void main( void ) {
+	vec2 position = ( gl_FragCoord.xy / resolution.xy );
+
+	float r = 0.0;
+	float g = 0.0;
+	float b = 0.0;
+
+	float sampleSqrt = 3.0;
+
+	for (float x = 0.0; x < sampleSqrt; x++) {
+		for (float y = 0.0; y < sampleSqrt; y++) {
+			vec3 color = color_for_position(
+				vec2(
+					(x / (resolution.x * sampleSqrt)) + position.x, 
+					(y / (resolution.y * sampleSqrt)) + position.y
+				)
+			);
+			r += color.r;
+			g += color.g;
+			b += color.b;
+		}
+	}
+
+	r /= sampleSqrt * sampleSqrt * 0.75;
+	g /= sampleSqrt * sampleSqrt * 0.75;
+	b /= sampleSqrt * sampleSqrt * 0.75;
+
+	gl_FragColor = vec4(vec3(r, g, b), 1.0);
+}