163 lines
3.3 KiB
NASM
163 lines
3.3 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(MAIN_ASM)
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DEF MAIN_ASM EQU 1
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INCLUDE "globals.asm"
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INCLUDE "res/other_data.inc"
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SECTION "High Globals", HRAM
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hGameState:: ds 1
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SECTION "Globals", WRAM0
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wSwapABState:: ds 1
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wRNGModeState:: ds 1
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wRotModeState:: ds 1
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wDropModeState:: ds 1
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wSpeedCurveState:: ds 1
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wAlways20GState:: ds 1
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wBGMode:: ds 1
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wInitialA:: ds 1
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wInitialB:: ds 1
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wInitialC:: ds 1
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SECTION "Stack", WRAM0
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wStack::
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ds STACK_SIZE + 1
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wStackEnd::
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SECTION "Code Entry Point", ROM0
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; Main entry point. Does some set up and then goes into an infinite event loop initialized on the title screen.
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Main::
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; Load the initial registers. For reasons.
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ld [wInitialA], a
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ld a, b
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ld [wInitialB], a
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ld a, c
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ld [wInitialC], a
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; Initialize the mapper.
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ld a, CART_SRAM_ENABLE
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ld [rRAMG], a
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xor a, a
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ld [rRAMB], a
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ld a, BANK_OTHER
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ld [rROMB0], a
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; Set up stack
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ld sp, wStackEnd-1
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; GBC? Double speed.
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ld a, [wInitialA]
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cp a, $11
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jr nz, .notgbc
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ld a, KEY1F_PREPARE
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ldh [rKEY1], a
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stop
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.notgbc
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; Harvest entropy
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call HarvestEntropy
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; Let the console have some fun with the initial screen.
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call InputInit
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call BankingInit
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xor a, a
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ldh [hFilterMode], a
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call DoIntroEffect
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; Turn off LCD during initialization.
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wait_vram
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xor a, a
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ldh [rLCDC], a
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ld [wSpritePal], a
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; Clear OAM.
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call ClearOAM
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call SetNumberSpritePositions
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call CopyOAMHandler
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; Other initialization.
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call RestoreSRAM
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call InputInit
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call TimeInit
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call SFXInit
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call BankingInit
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xor a, a
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ld [wKillScreenActive], a
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ld [wSkippedSectionsBCD], a
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ldh [hMode], a
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; Switch to title state.
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call SwitchToTitle
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; Event loop time!
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EventLoop::
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; Play the sound effect, if any.
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call SFXPlay
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call SFXPlayNoise
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; Wrangle inputs and timers at the start of every frame.
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call GetInput
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call HandleTimers
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call HandleSectionTimers
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; Call the current state's event handler.
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ld hl, .eventloopjumps
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ldh a, [hGameState]
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ld b, 0
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ld c, a
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add hl, bc
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jp hl
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.eventloopjumps
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jp TitleEventLoopHandler
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jp GamePlayEventLoopHandler
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jp GamePlayBigEventLoopHandler
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EventLoopPostHandler::
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; Wait for vblank.
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wait_vblank
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; Do OAM DMA.
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call hOAMDMA
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; Call the current state's vblank handler.
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ld hl, .vblankjumps
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ldh a, [hGameState]
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ld b, 0
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ld c, a
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add hl, bc
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jp hl
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.vblankjumps
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jp TitleVBlankHandler
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jp BlitField
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jp BigBlitField
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; The VBlank Handler is expected to end with jp EventLoop.
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ENDC
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