Initial release

engine/plugins/schedulers/bong_tangent.lua

@@ -0,0 +1,38 @@
+-- bong_tangent.lua: Tangent-based scheduler, concentrates at high noise
+
+scheduler = {
+    name        = "bong_tangent",
+    display     = "Tangent",
+    description = "Front-loaded (structural focus)",
+}
+
+function schedule(output, num_steps, shift)
+    local scale = 1.5
+    for i = 0, num_steps - 1 do
+        local frac = (i + 0.5) / num_steps
+        local angle = frac * math.pi / 2.0
+        local tan_val = math.tan(angle)
+        output[i] = 1.0 - (2.0 / math.pi) * math.atan(tan_val * scale)
+    end
+    -- Sort descending
+    local vals = {}
+    for i = 0, num_steps - 1 do vals[i+1] = output[i] end
+    table.sort(vals, function(a,b) return a > b end)
+    for i = 0, num_steps - 1 do output[i] = vals[i+1] end
+    clamp(output, num_steps)
+    apply_shift(output, num_steps, shift)
+end
+
+function apply_shift(ts, n, shift)
+    if shift == 1.0 then return end
+    for i = 0, n - 1 do
+        local t = ts[i]; ts[i] = shift * t / (1.0 + (shift - 1.0) * t)
+    end
+end
+
+function clamp(ts, n)
+    for i = 0, n - 1 do
+        if ts[i] < 1e-6 then ts[i] = 1e-6 end
+        if ts[i] > 1.0 then ts[i] = 1.0 end
+    end
+end