initial commit

hypr/grayscale.glsl

@@ -0,0 +1,9 @@
+precision mediump float;
+varying vec2 v_texcoord;
+uniform sampler2D tex;
+
+void main() {
+  vec4 this_colour = texture2D( tex, v_texcoord ); 
+  float new_colour = (this_colour.r+this_colour.g+this_colour.b)/3.0;
+  gl_FragColor = vec4(new_colour,new_colour,new_colour,1.0);
+}