Initial release

engine/plugins/schedulers/linear_quadratic.lua

@@ -0,0 +1,38 @@
+-- linear_quadratic.lua: Linear start, quadratic finish
+
+scheduler = {
+    name        = "linear_quadratic",
+    display     = "Linear-Quadratic",
+    description = "Linear start, quadratic finish",
+}
+
+function schedule(output, num_steps, shift)
+    local crossover = 0.5
+    local n_linear = math.max(math.floor(num_steps * crossover), 1)
+    local n_quad = num_steps - n_linear
+    local t_cross = 1.0 - crossover
+
+    for i = 0, n_linear - 1 do
+        output[i] = 1.0 - i * crossover / n_linear
+    end
+    for i = 0, n_quad - 1 do
+        local frac = (i + 1) / n_quad
+        output[n_linear + i] = t_cross * (1.0 - frac * frac)
+    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