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| author | Miquel Sabaté Solà <mssola@mssola.com> | 2026-03-23 23:59:26 +0100 |
|---|---|---|
| committer | Miquel Sabaté Solà <mssola@mssola.com> | 2026-03-23 23:59:26 +0100 |
| commit | 0c9b0ad7938e2ba7e994574b4947e25c82440b8c (patch) | |
| tree | cb6721fc9689104463b5a71ca02303299486af9e /src/background.s | |
| parent | fb23cf51040f06bfcfbaf318d7b452d76ffbedfb (diff) | |
| download | jetpac.nes-0c9b0ad7938e2ba7e994574b4947e25c82440b8c.tar.gz jetpac.nes-0c9b0ad7938e2ba7e994574b4947e25c82440b8c.zip | |
Implement the "take off" animation
This is the animation that is done after clearing a stage. Moreover, and
for the first time since I started development, now we can move into the
next level as intended from the game's design.
Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
Diffstat (limited to 'src/background.s')
| -rw-r--r-- | src/background.s | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/src/background.s b/src/background.s index 0facde6..369def9 100644 --- a/src/background.s +++ b/src/background.s @@ -107,4 +107,58 @@ ;; End of the list. .byte $FF + + ;; Clear out the shuttle from the background. + ;; + ;; NOTE: this should only be called from NMI code. + .proc clear_shuttle + ;; The low part of the rocket. + bit PPU::m_status + ldx #$2B + stx PPU::m_address + ldx #$15 + stx PPU::m_address + sta PPU::m_data + sta PPU::m_data + + ;; High part of the rocket. + bit PPU::m_status + ldy #$2A + sty PPU::m_address + ldx #$75 + stx PPU::m_address + sta PPU::m_data + sta PPU::m_data + + bit PPU::m_status + sty PPU::m_address + ldx #$95 + stx PPU::m_address + sta PPU::m_data + sta PPU::m_data + + bit PPU::m_status + sty PPU::m_address + ldx #$B5 + stx PPU::m_address + sta PPU::m_data + sta PPU::m_data + + ;; Middle part of the rocket. + bit PPU::m_status + sty PPU::m_address + ldx #$D5 + stx PPU::m_address + sta PPU::m_data + sta PPU::m_data + + bit PPU::m_status + sty PPU::m_address + ldx #$F5 + stx PPU::m_address + sta PPU::m_data + sta PPU::m_data + + rts + .endproc .endscope |