91 lines
1.6 KiB
NASM
91 lines
1.6 KiB
NASM
; DMGTRIS
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; Copyright (C) 2023 - Randy Thiemann <randy.thiemann@gmail.com>
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; This program is free software: you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation, either version 3 of the License, or
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; (at your option) any later version.
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; This program is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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; You should have received a copy of the GNU General Public License
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; along with this program. If not, see <https://www.gnu.org/licenses/>.
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IF !DEF(DMGFX_ASM)
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DEF DMGFX_ASM EQU 1
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INCLUDE "globals.asm"
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SECTION "DMG Intro Effect", ROM0
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; Does a small effect on boot with the nintendo logo.
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DoDMGEffect::
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ld a, [wInitialA]
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cp a, $11
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ret z
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; Yeet the logo
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ld c, 10
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.loop0
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wait_vblank
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ldh a, [rSCY]
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dec a
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ldh [rSCY], a
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wait_vblank_end
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dec c
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jr nz, .loop0
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ld c, 45
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.loop1
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wait_vblank
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ldh a, [rSCY]
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inc a
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inc a
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ldh [rSCY], a
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wait_vblank_end
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dec c
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jr nz, .loop1
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; Fade
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wait_vblank
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ld a, PALETTE_MONO_2
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ldh [rBGP], a
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ld c, 20
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.loop2
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wait_vblank
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wait_vblank_end
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dec c
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jr nz, .loop2
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wait_vblank
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ld a, PALETTE_MONO_1
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ldh [rBGP], a
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ld c, 20
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.loop3
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wait_vblank
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wait_vblank_end
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dec c
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jr nz, .loop3
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wait_vblank
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ld a, PALETTE_MONO_0
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ldh [rBGP], a
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ld c, 20
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.loop4
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wait_vblank
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wait_vblank_end
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dec c
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jr nz, .loop4
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ret
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ENDC
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