diff options
Diffstat (limited to 'bunny.gbasm')
| -rw-r--r-- | bunny.gbasm | 57 |
1 files changed, 51 insertions, 6 deletions
diff --git a/bunny.gbasm b/bunny.gbasm index 62ee751..9e80bef 100644 --- a/bunny.gbasm +++ b/bunny.gbasm @@ -1,7 +1,7 @@ Initialize_Bunny: - LD A, $20 + LD A, $50 LD ($80), A - LD A, $20 + LD A, $50 LD ($81), A RET @@ -27,32 +27,77 @@ Move_Bunny: Move_Bunny.check_direction_end: BIT 1, A - JR NZ, =Move_Bunny.vertical_move + JR NZ, =Move_Bunny.vertical_px_move - Move_Bunny.horizontal_move: + Move_Bunny.horizontal_px_move: LD A, ($81) ADD B + CP $30 + JR C, =Move_Bunny.horizontal_px_move.scrolling_fallback + CP $71 + JR NC, =Move_Bunny.horizontal_px_move.scrolling_fallback LD ($81), A JP =Move_Bunny.check_end_of_movement + Move_Bunny.horizontal_px_move.scrolling_fallback: + LD A, ($43) + ADD B + LD ($43), A + JP =Move_Bunny.check_end_of_movement - Move_Bunny.vertical_move: + + Move_Bunny.vertical_px_move: LD A, ($80) ADD B + CP $30 + JR C, =Move_Bunny.vertical_px_move.scrolling_fallback + CP $71 + JR NC, =Move_Bunny.vertical_px_move.scrolling_fallback LD ($80), A + JP =Move_Bunny.check_end_of_movement + Move_Bunny.vertical_px_move.scrolling_fallback: + LD A, ($42) + ADD B + LD ($42), A + JP =Move_Bunny.check_end_of_movement Move_Bunny.check_end_of_movement: + LD A, ($84) + INC A AND $0f LD ($84), A JR NZ, =Move_Bunny.end LD ($83), A + LD A, ($85) + DEC A + + BIT 1, A + JR NZ, =Move_Bunny.vertical_tile_move + + Move_Bunny.horizontal_tile_move: + LD A, ($86) + ADD B + LD ($86), A + JP =Move_Bunny.end + + Move_Bunny.vertical_tile_move: + LD A, ($87) + ADD B + LD ($87), A Move_Bunny.end: RET Display_Bunny: ; X position in $81, Y position in $80 + LD A, ($86) + LD HL, $9800 + CALL =Print_8bit + + LD A, ($87) + LD HL, $9820 + CALL =Print_8bit + LD A, ($81) LD B, A - LD A, ($80) LD C, A LD A, ($84) |