shaders moved to subdir; console click on the actor to type its id in

assets/shaders/blur_dither.frag

@@ -0,0 +1,59 @@
+/**
+ * Blue Noise texture created by Christoph Peters, released under CC0
+ * http://momentsingraphics.de/BlueNoise.html
+ */
+#version 120
+#ifdef GL_ES
+    precision mediump float;
+#endif
+
+varying vec4 v_color;
+varying vec2 v_texCoords;
+uniform sampler2D u_texture;
+uniform sampler2D u_pattern;
+uniform ivec2 rnd = ivec2(0,0);
+
+float quant = 127.0; // 64 steps -> 63.0; 256 steps -> 255.0
+vec4 quantiser = vec4(quant);
+vec4 quantiserDivider = vec4(1.0 / quant);
+
+vec2 boolean = vec2(0.0, 1.0);
+vec4 halfvec = vec4(0.5);
+
+vec2 patternsize = vec2(1.0/512.0, 1.0/512.0);
+
+vec4 nearestColour(vec4 inColor) {
+    return floor(quantiser * inColor + halfvec) * quantiserDivider;
+}
+
+vec4 getDitherredDot(vec4 inColor) {
+    vec4 bayerThreshold = vec4(texture2D(u_pattern, (gl_FragCoord.xy + rnd) * patternsize) - 0.5);
+    return nearestColour(bayerThreshold * quantiserDivider + inColor);
+}
+
+
+uniform vec2 iResolution;
+uniform float flip;
+uniform vec2 direction;
+
+vec4 blur(sampler2D image, vec2 uv, vec2 resolution, vec2 direction) {
+    vec4 color = vec4(0.0);
+    vec2 off1 = vec2(1.3846153846) * direction;
+    vec2 off2 = vec2(3.2307692308) * direction;
+    color += texture2D(image, uv) * 0.2270270270;
+    color += texture2D(image, uv + (off1 / resolution)) * 0.3162162162;
+    color += texture2D(image, uv - (off1 / resolution)) * 0.3162162162;
+    color += texture2D(image, uv + (off2 / resolution)) * 0.0702702703;
+    color += texture2D(image, uv - (off2 / resolution)) * 0.0702702703;
+    return color;
+}
+
+void main() {
+    vec2 uv = vec2(gl_FragCoord.xy / iResolution.xy);
+    if (flip == 1.0) { uv.y = 1.0 - uv.y; }
+
+    vec4 inColor = blur(u_texture, uv, iResolution.xy, direction);
+    vec4 selvec = getDitherredDot(inColor);
+
+    gl_FragColor = selvec; // quantise all four RGBA
+}