fix: yield inside wedge rasteriser and between wedges; only redraw ball each spin frame

programs/roulette.lua

@@ -181,8 +181,12 @@ local function drawWedge(slotIdx, rotorAngle, glowing)
     local by1 = math.ceil(CY  + ro) + 1
 
     -- Normalise angle range to handle wrap-around
-    -- We scan row by row and fill runs for speed
+    -- We scan row by row and fill runs for speed.
+    -- Yield every 32 rows so CC:Tweaked doesn't kill us.
+    local rowCount = 0
     for sy = by0, by1 do
+        rowCount = rowCount + 1
+        if rowCount % 32 == 0 then sleep(0) end
         local runStart = nil
         for sx = bx0, bx1 do
             local dx = sx - CX
@@ -228,6 +232,8 @@ end
 local function drawAllWedges(rotorAngle, glowSlot)
     for i = 1, NUM_POCKETS do
         drawWedge(i, rotorAngle, i == glowSlot)
+        -- yield between wedges so CC doesn't kill us during init
+        sleep(0)
     end
 end
 
@@ -360,10 +366,10 @@ local function spin()
             ballR = (R_OUTER - 6 + R_POCKET_OUT + 2) / 2 * (1 - t) + R_SETTLE * t
         end
 
-        -- Draw frame
-        drawWheelStatic(rotorAngle, nil)
-
-        -- Erase old ball area by redrawing wheel under it (handled by full redraw above)
+        -- Erase old ball, draw new ball.
+        -- Repaint a small circle at the old position with the track colour,
+        -- then draw the ball at the new position.
+        px_circle(ballX, ballY, BALL_RADIUS + 3, COL_TRACK)
         local bx, by = ballPosAt(ballR, ballAngle)
         drawBallAt(bx, by)
         gpu.sync()
@@ -407,17 +413,17 @@ end
 ----------------------------------------------------------------------
 
 local function glowAnimation(slotIdx)
+    local R_SETTLE = (R_POCKET_IN + R_POCKET_OUT) / 2
+    local sa = slotAngle(slotIdx, rotorAngle)
+    local bx, by = ballPosAt(R_SETTLE, sa)
     for flash = 1, 6 do
-        drawWheelStatic(rotorAngle, flash % 2 == 1 and slotIdx or nil)
-        local sa = slotAngle(slotIdx, rotorAngle)
-        local bx, by = ballPosAt((R_POCKET_IN + R_POCKET_OUT) / 2, sa)
+        drawWedge(slotIdx, rotorAngle, flash % 2 == 1)
         drawBallAt(bx, by)
         gpu.sync()
         sleep(0.18)
     end
-    drawWheelStatic(rotorAngle, slotIdx)
-    local sa = slotAngle(slotIdx, rotorAngle)
-    local bx, by = ballPosAt((R_POCKET_IN + R_POCKET_OUT) / 2, sa)
+    -- Leave glowing
+    drawWedge(slotIdx, rotorAngle, true)
     drawBallAt(bx, by)
     gpu.sync()
 end