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SegaVDP.i
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SegaVDP.i
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;@
;@ SegaVDP.i
;@ Sega VDP chip emulator for GBA/NDS.
;@
;@ Created by Fredrik Ahlström on 2012-03-10.
;@ Copyright © 2012-2023 Fredrik Ahlström. All rights reserved.
;@
;@ ASM header for the SegaVDP emulator
;@
//-----------------------------------------------------------vdp types
#define VDPAUTO (0x00) // Should not be used.
#define VDPTMS9918 (0x01) // SG-1000, SC-3000, OMV, Coleco & MSX VDP
#define VDPSega3155066 (0x01) // SG-1000 II VDP, TMS9918 and SN76489 in the same package (but with RGB output?)
#define VDPSega3155124 (0x02) // Mark III & SMS1 VDP
#define VDPSega3155246 (0x03) // SMS2 VDP
#define VDPSega3155313 (0x04) // Mega Drive VDP (YM7101 /FC1001)
//#define VDPSega3155315 (0x04) // Mega Drive / Pico VDP (YM7101 /FC1001)
#define VDPSega3155378 (0x05) // GG VDP VA0, correct number or is it 5377?
//#define VDPSega3155487 (0x06) // Mega Drive 1/2 VDP (vdp & sound) (Yamaha FC1004)
//#define VDPSega3155535 (0x05) // GG VDP VA1, later version.
//#define VDPSega3155582 (0x05) // GG VDP, later version?
//#define VDPSega3155660 (0x06) // Mega Drive 2 VDP (vdp & sound)(Yamaha FC1004)
//#define VDPSega3155685 (0x08) // Mega Drive 2 VDP (Toshiba TC6158AF)
//#define VDPSega3155700 (0x07) // Nomad VDP (combined vdp, sound & Z80?)(Yamaha FF1004)
//#define VDPSega3155708 (0x06) // Mega Drive 1/2? (Yamaha FC1004)
//#define VDPSega3155786 (0x08) // Mega Drive 2 VDP (Toshiba T9N13BF)
//#define VDPSega3155960 (0x09) // Mega Drive 2/3 VDP (combined vdp, sound & Z80?) (Yamaha FJ3002)
//#define VDPSega3156123 (0x0A) // Mega Drive 3 / Pico VDP (combined M68K, Z80, VDP, YM2612) (Yamaha FQ8007), column -1 scroll fixed?
#define VDPTYPE_MASK (0x07)
#define TVTYPEPAL (0x80) // 0x00=NTSC 0x80=PAL timing
#define GGMODE (0x40) // 0x00=normal 0x40=GG mode
//-----------------------------------------------------------vdp modes
#define VDPMODE_0 (0x00)
#define VDPMODE_1 (0x01)
#define VDPMODE_2 (0x02)
#define VDPMODE_3 (0x03)
#define VDPMODE_4 (0x04)
#define VDPMODE_4_224 (0x14)
#define VDPMODE_4_240 (0x24)
#define VDPMODE_5 (0x05)
#define VDPMODE_5_224 (0x15)
#define VDPMODE_5_240 (0x25)
#define VDPMODE_B (0x88)
#define VDPHEIGHT_192 (0x00)
#define VDPHEIGHT_224 (0x10)
#define VDPHEIGHT_240 (0x20)
#define VDPMODE_MASK (0x0F)
#define VDPMODE_HEIGHTMASK (0x30)
#define VDPSTATESIZE (0xE0)
rclr .req r4
vdpptr .req r12
;@ SegaVDP.s
.struct 0
dirtyTiles: .space 0x200
vdpSpriteTileBuffer: .space 0x20
vdpSpritePosBuffer: .space 0x20
vdpJumpTable: .space 0x80 ;@
vdpCtrlTable: .space 0x10 ;@
scrollBuff: .space 320 ;@ Horizontal scrollbuffer.
TMapBuff: .space 320 ;@ Tilemap buffer.
VRAMPtr: .long 0
VRAMCopyPtr: .long 0
vdpModesPtr: .long 0
irqRoutine: .long 0 ;@
debounceRoutine: .long 0
vdpScanlineHook: .long 0
vdpTmpOAMBuffer: .long 0
vdpDMAOAMBuffer: .long 0
vdpDirtyTilesPtr: .long 0
.space 0x0C
vdpState: ;@
vdpAdr: .long 0
vdpScanline: .long 0
vdpBuff: .byte 0,0 ;@ vdpbuff + toggle need to be together in this way.
vdpToggle: .byte 0,0
vdpBuffMD: .byte 0
vdpCtrl: .byte 0
vdpStat: .byte 0 ;@ VBlank + spr stat
vdpPending: .byte 0 ;@ line interrupt pending
vdpRegisters:
vdpMode1: .byte 0
vdpMode2: .byte 0
vdpNameTable: .byte 0
vdpCTOffset: .byte 0
vdpPGOffset: .byte 0
vdpSATOffset: .byte 0
vdpSPROffset: .byte 0
vdpBDColor: .byte 0
vdpXScroll: .byte 0
vdpYScroll: .byte 0
vdpCounter: .byte 0
vdpMode3: .byte 0
vdpMode4: .byte 0
vdpHScrollAdr: .byte 0
vdpReg0E: .byte 0
vdpReg0F: .byte 0
vdpMDRegs: .space 0x10
vdpRegistersSize:
vdpPaletteRAM: .space 0x80
vdpHCountLatch: .byte 0
vdpHCountOffset: .byte 0
vdpHCountBP: .byte 0
vdpVCountBP: .byte 0
vdpNametableLine: .long 0
vdpScrollXLine: .long 0
vdpScanlineBP: .long 0
vdpType: .byte 0
vdpTVType: .byte 0
vdpGGMode: .byte 0
vdpMode2Bak1: .byte 0
vdpMode2Bak2: .byte 0
vdpYScrollBak1: .byte 0
vdpPGOffsetBak1: .byte 0
vdpRealMode: .byte 0
vdpCalcMode: .byte 0
vdpHeightMode: .byte 0
vdpLineState: .byte 0
vdpPrimedVBl: .byte 0
vdpDebouncePin: .byte 0
vdpNTMask: .byte 0
.space 0x02
vdpScrollMask: .long 0
vdpSprStop: .long 0
vdpLineIRQ: .long 0
vdpNextLineChange: .long 0
.space 0x04
vdpStateTable:
vdpZeroLine: .long 0,0
vdpScrStartLine: .long 0,0
vdpMidFrameLine: .long 0,0
vdpEndFrameLine: .long 0,0
vdpVBlLine: .long 0,0
vdpVBlEndLine: .long 0,0
vdp2ndLastScanline: .long 0,0
vdpLastScanline: .long 0,0
vdpTotalScanlines: .long 0,0
.space 0x04
vdpBgrMapOfs0: .long 0
vdpBgrMapOfs1: .long 0
vdpBgrTileOfs: .long 0
vdpSprTileOfs: .long 0
vdpSize:
;@----------------------------------------------------------------------------