quick

shaders/ComputeShader.glsl

@@ -16,23 +16,49 @@ layout(std430, binding = 0) buffer particles
 };
 
 uniform float dt;
+uniform vec3 resetPos;
+uniform uint seed;
 
 layout (local_size_x = 256, local_size_y = 1, local_size_z = 1) in;
 
+float rand()
+{
+    uint seedR;
+    seedR = (seed * 1103515245u + 12345u);
+    return float(seed) / 4294967296.0;
+}
+
+vec3 rand3() {
+    vec3 result;
+    uint seedR;
+    seedR = (seed * 1103515245u + 12345u);
+    result.x = float(seed);
+    seedR = (seed * 1103515245u + 12345u);
+    result.y = float(seed);
+    seedR = (seed * 1103515245u + 12345u);
+    result.z = float(seed);
+    return (result / 2147483648.0) - vec3(1,1,1);
+}
+
 void main()
 {
     uint gid = gl_GlobalInvocationID.x;
     particle part = p[gid];
 
-    if (part.age > 0 || part.pos.x > 1 || part.pos.y > 1 || part.pos.z > 1)
+    if (part.age < 0 || part.pos.x > 1 || part.pos.y > 1 || part.pos.z > 1
+        || part.pos.x < -1 || part.pos.y < -1 || part.pos.z < -1 )
+    {
+        part.pos = resetPos;
+        part.vel = rand3();
+        part.col = vec3(rand(), rand(), rand());
+        part.age = rand() * 0x7fff * 0.01f;
+
+    }
+    else
     {
         part.pos += part.vel * dt;
         part.age -= 0.01f;
     }
-    else
-    {
-        part.pos = vec3(0, 0, 0);
-    }
 
     p[gid] = part;
 }

shaders/VertexShader.glsl

@@ -8,5 +8,5 @@ out vec3 colV;
 void main(void)
 {
     colV = colIn;
-    gl_Position = vec4(pos, 0);
+    gl_Position = vec4(pos, 1);
 }