Added jump flood

orx-jumpflood/src/main/resources/shaders/gl3/encode-points.frag

@@ -0,0 +1,16 @@
+#version 330 core
+
+uniform sampler2D tex0;
+in vec2 v_texCoord0;
+
+out vec4 o_color;
+
+void main() {
+    float ref = texture(tex0, v_texCoord0).r;
+    vec4 outc = vec4(-1.0, -1.0, 0.0, 1.0);
+
+    if (ref > 0.5) {
+        outc.xy = v_texCoord0.xy;
+    }
+    o_color = outc;
+}

orx-jumpflood/src/main/resources/shaders/gl3/jumpflood.frag

@@ -0,0 +1,39 @@
+#version 330 core
+in vec2 v_texCoord0;
+
+uniform sampler2D tex0;
+uniform int maxSteps;
+uniform int step;
+
+out vec4 o_color;
+void main() {
+
+    float stepwidth = 1.0 / pow(2.0, step+1);
+
+    float bestDistance = 9999.0;
+    vec2 bestCoord = vec2(-1.0);
+    vec2 bestColor = vec2(-1.0);
+
+    vec2 is = vec2(1.0) / textureSize(tex0, 0);
+
+    float found = 0.0;
+    for (int y = -1; y <= 1; ++y) {
+        for (int x = -1; x <= 1; ++x) {
+            vec2 sampleCoord = v_texCoord0 + vec2(stepwidth) * vec2(x,y);
+            vec4 data = texture( tex0, sampleCoord);
+            vec2 seedCoord = data.xy;
+            vec2 seedColor = data.zw;
+            float dist = length(seedCoord - v_texCoord0);
+            if ((seedCoord.x >= 0.0 || seedCoord.y >= 0.0) && dist < bestDistance)
+            {
+                found = 1.0;
+                bestDistance = dist;
+                bestCoord = seedCoord;
+                bestColor = seedColor;
+            }
+        }
+    }
+
+    o_color = vec4(bestCoord, found, 1.0);
+
+}