initial commit

tables.asm

@@ -0,0 +1,47 @@
+; -----------------------------------------------------------
+; tables.asm - perspective and speed tables, generated at
+; assembly time; t is the rabbit's distance (0 = horizon,
+; 255 = the player's line)
+; -----------------------------------------------------------
+
+; feet y along the lane: linear from the horizon to the player
+ytab:
+!for i, 0, 255 {
+    !byte 100 + (111*i) DIV 256
+}
+
+; horizontal fan-out on a t^2 curve (full offset of the outer
+; lanes; the inner lanes use half of it)
+offtab:
+!for i, 0, 255 {
+    !byte (107*i*i) DIV 65536
+}
+
+; hop wave, subtracted from the feet y (doubled for big rabbits)
+hoptab:
+    !byte 0, 1, 2, 4, 4, 3, 2, 1
+
+; speed ramp: score (capped at 64) -> 16-bit speed bonus
+sptab_lo:
+!for i, 0, 64 {
+    !byte <(i*13)
+}
+sptab_hi:
+!for i, 0, 64 {
+    !byte >(i*13)
+}
+
+; scooter sprite x per lane (lane center - 12); lane 4 crosses
+; the 8-bit boundary, pxhi is its MSB flag
+pxlo:
+    !byte 66, 119, 172, 225, 22
+pxhi:
+    !byte 0, 0, 0, 0, 1
+
+; rabbit slot -> sprite register offset (sprite = slot + 1)
+sprxreg:
+    !byte 2, 4, 6, 8, 10, 12, 14
+
+; rabbit slot -> sprite enable/MSB/expand bit
+sprbit:
+    !byte 2, 4, 8, 16, 32, 64, 128