fixed movement not wrapping around the world.. again

shaders/agents_cs.glsl

@@ -12,7 +12,7 @@ layout(binding = 2) restrict buffer AgentBuffer {
 } agent_buffer;
 
 layout(push_constant, std430) uniform Params {
-    ivec2 texture_size;
+    vec2 texture_size;
     float sensor_angle;
     float sensor_distance;
 } params;
@@ -24,13 +24,7 @@ float random(vec2 coords) {
 }
 
 vec2 loop_position(vec2 pos) {
-    int width = params.texture_size.x;
-    int height = params.texture_size.y;
-    if (pos.x > width) pos.x = mod(pos.x, width);
-    if (pos.y > height) pos.y = mod(pos.y, height);
-    if (pos.x < 0) pos.x = width + pos.x;
-    if (pos.y < 0) pos.y = height + pos.y;
-    return pos;
+    return mod(pos, params.texture_size);
 }
 
 void main() {
@@ -39,6 +33,8 @@ void main() {
     vec2 position = agent_buffer.positions[id];
     float heading = agent_buffer.headings[id];
 
+    float current_v = imageLoad(current_trail, ivec2(position)).r;
+
     float sa = params.sensor_angle;
     float left_heading = heading - sa;
     float right_heading = heading + sa;
@@ -64,17 +60,26 @@ void main() {
     } else if (right > forward && right > left) {
         pos += right_detect_dir * SPEED;
         new_heading = right_heading;
+    } else if (forward < left && forward < right) {
+        // uuugh
+        float r = random(pos);
+        if (r < 0.5) {
+            pos += right_detect_dir * SPEED;
+            new_heading = right_heading;
+        } else {
+            pos += left_detect_dir * SPEED;
+            new_heading = left_heading;
+        }
     } else {
         pos += forward_detect_dir * SPEED;
     }
 
-    pos = loop_position(pos);
+    pos = mod(pos, params.texture_size);
     agent_buffer.positions[id] = pos;
     agent_buffer.headings[id] = new_heading;
 
-    float current_v = imageLoad(current_trail, ivec2(pos)).r;
-
     float new_v = current_v + 0.3;
+    if (new_v > 1.0) new_v = 1.0;
 
     vec4 result = vec4(new_v, new_v, new_v, 1.0);
     imageStore(output_trail, ivec2(pos), result);