ffnord-con-2015-2 hinzugefügt

ffnord-con-2015-2/31c3/COPYRIGHT

@@ -0,0 +1,7 @@
+Created by Florian Wesch <fw@dividuum.de>
+
+This work is licensed under a Creative Commons Attribution 4.0 International License.
+http://creativecommons.org/licenses/by/4.0/
+
+The tiles.png, package.png, screenshot.jpg are based on the design by graphorama
+http://www.graphorama.de/blog/31c3-das-design/

ffnord-con-2015-2/31c3/README.creole

@@ -0,0 +1,6 @@
+= A 31c3 themed background pattern
+
+{{screenshot.jpg|Screenshot}}
+
+Background pattern for the 
+[[http://events.ccc.de/congress/2014/wiki/Static:Main_Page|31c3 conference in Hamburg]].

ffnord-con-2015-2/31c3/node.json

@@ -0,0 +1,4 @@
+{
+    "name": "31c3 Pattern",
+    "options": []
+}

ffnord-con-2015-2/31c3/node.lua

@@ -0,0 +1,29 @@
+gl.setup(NATIVE_WIDTH, NATIVE_HEIGHT)
+
+sys.set_flag("slow_gc")
+
+util.resource_loader{
+    "shader31c3.frag";
+    "noise.png";
+    "tiles.png";
+}
+
+function node.render()
+    local now = sys.now()
+
+    local x = math.sin(now/62) * 320
+    local y = math.cos(now/128) * 200
+
+    gl.perspective(80 + math.cos(now/5) * 3, x + math.sin(now/14)*10, y + math.cos(now/14.4)*20, -100, x, y, 0)
+    gl.rotate(math.cos(now/9)*5, 0, 0, 1)
+
+    shader31c3:use{
+        time = now / 1234.5;
+        noise = noise;
+        tile_res = {16, 16};
+        res = {16.0 * 12, 16.0 * 12};
+    }
+
+    local size = 40
+    tiles:draw(-16*size, -16*size, 16*size, 16*size)
+end

ffnord-con-2015-2/31c3/package.json

@@ -0,0 +1,6 @@
+{
+    "name": "Animated background pattern",
+    "author": "fw@dividuum.de",
+    "desc": "Background pattern created for the 31c3 conference in Hamburg",
+    "repository": "https://github.com/info-beamer/package-31c3-background"
+}

ffnord-con-2015-2/31c3/shader31c3.frag

@@ -0,0 +1,28 @@
+uniform sampler2D Texture;
+uniform sampler2D noise;
+varying vec2 TexCoord;
+uniform float time;
+uniform vec2 res;
+uniform vec2 tile_res;
+
+const vec2 one = vec2(1.0, 1.0);
+
+void main() {
+    vec2 tcoord_res = TexCoord * res;
+    vec2 noise_vec1 = vec2(0.0, time * 0.8);
+    vec2 noise_vec2 = noise_vec1 + vec2(time * 0.9, 0.0);
+
+    vec2 pos = floor(tcoord_res) / res;
+
+    float foo = texture2D(noise, mod(pos * 41.0 + noise_vec1, one)).x;
+    float bar = texture2D(noise, mod(pos * 5.0 + noise_vec2, one)).x;
+
+    vec2 t = vec2(foo, bar);
+    t = floor(t * tile_res) / tile_res;
+
+    // gl_FragColor = vec4(t, 0.0, 1.0);
+    gl_FragColor = vec4(texture2D(
+        Texture, 
+        mod(tcoord_res, one) / tile_res + t
+    ).rgb, 1.0);
+}