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NES presets; neslib .o w/ splitxy()
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Steven Hugg
parent
dcd07a1440
commit
645815155b
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@ -60,17 +60,17 @@ const unsigned char* const playerRunSeq[16] = {
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/*{pal:"nes",layout:"nes"}*/
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const char PALETTE[32] = {
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0x03, // background color
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0x03, // screen color
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0x25,0x30,0x27,0x00, // ladders and pickups
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0x1C,0x20,0x2C,0x00, // floor blocks
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0x00,0x10,0x20,0x00,
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0x06,0x16,0x26,0x00,
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0x11,0x30,0x27,0x0, // background palette 0
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0x1c,0x20,0x2c,0x0, // background palette 1
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0x00,0x10,0x20,0x0, // background palette 2
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0x06,0x16,0x26,0x0, // background palette 3
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0x16,0x35,0x24,0x00, // enemy sprites
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0x00,0x37,0x25,0x00, // rescue person
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0x0D,0x2D,0x1A,0x00,
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0x0D,0x27,0x2A // player sprites
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0x16,0x35,0x24,0x0, // sprite palette 0
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0x00,0x37,0x25,0x0, // sprite palette 1
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0x0d,0x2d,0x3a,0x0, // sprite palette 2
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0x0d,0x27,0x2a // sprite palette 3
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};
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// setup PPU and tables
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@ -172,6 +172,11 @@ void __fastcall__ scroll(unsigned int x, unsigned int y);
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// warning: only X scroll could be changed in this version
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void __fastcall__ split(unsigned int x, unsigned int y);
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// set scroll after screen split invoked by the sprite 0 hit
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// sets both X and Y, but timing might be iffy depending
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// on exact sprite 0 position
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void __fastcall__ splitxy(unsigned int x, unsigned int y);
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// select current chr bank for sprites, 0..1
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void __fastcall__ bank_spr(unsigned char n);
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@ -43,10 +43,7 @@ Start:
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; fill video RAM
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FillVRAM: subroutine
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txa
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ldy #$20
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sty PPU_ADDR
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sta PPU_ADDR
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PPU_SETADDR $2000
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ldy #$10
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.loop:
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sta PPU_DATA
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@ -59,10 +56,7 @@ FillVRAM: subroutine
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; set palette colors
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SetPalette: subroutine
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ldy #$00
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lda #$3f
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sta PPU_ADDR
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sty PPU_ADDR
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PPU_SETADDR $3f00
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ldx #32
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.loop:
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lda Palette,y
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150
presets/nes/xyscroll.asm
Normal file
150
presets/nes/xyscroll.asm
Normal file
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@ -0,0 +1,150 @@
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include "nesdefs.asm"
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;;;;; ZERO-PAGE VARIABLES
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seg.u ZEROPAGE
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org $0
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ScrollX ds 1
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ScrollY ds 1
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Temp ds 1
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;;;;; OTHER VARIABLES
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seg.u RAM
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org $300
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;;;;; NES CARTRIDGE HEADER
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NES_HEADER 0,2,1,0 ; mapper 0, 2 PRGs, 1 CHR, horiz. mirror
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;;;;; START OF CODE
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Start:
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NES_INIT ; set up stack pointer, turn off PPU
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jsr WaitSync ; wait for VSYNC
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jsr ClearRAM ; clear RAM
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jsr WaitSync ; wait for VSYNC (and PPU warmup)
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jsr SetPalette ; set palette colors
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jsr FillVRAM ; set PPU video RAM
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lda #0
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sta PPU_ADDR
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sta PPU_ADDR ; PPU addr = $0000
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sta PPU_SCROLL
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sta PPU_SCROLL ; scroll = $0000
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lda #CTRL_NMI
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sta PPU_CTRL ; enable NMI
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lda #MASK_BG|MASK_SPR
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sta PPU_MASK ; enable rendering
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.endless
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jmp .endless ; endless loop
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; fill video RAM
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FillVRAM: subroutine
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PPU_SETADDR $2000
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ldy #$10
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.loop:
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sta PPU_DATA
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adc #7
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inx
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bne .loop
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dey
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bne .loop
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rts
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; set palette colors
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SetPalette: subroutine
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PPU_SETADDR $3f00
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ldx #32
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.loop:
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lda Palette,y
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sta PPU_DATA
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iny
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dex
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bne .loop
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rts
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; set sprite 0
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SetSprite0: subroutine
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sta $200 ;y
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lda #$01 ;code
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sta $201
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lda #$20 ;flags
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sta $202
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lda #$fe ;xpos
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sta $203
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rts
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;;;;; COMMON SUBROUTINES
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include "nesppu.asm"
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;;;;; INTERRUPT HANDLERS
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NMIHandler: subroutine
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SAVE_REGS
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lda #0
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sta PPU_SCROLL
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sta PPU_SCROLL
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lda #111
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jsr SetSprite0
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; load sprites
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lda #$02
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sta PPU_OAM_DMA
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; wait for sprite 0
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.wait0 bit PPU_STATUS
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bvs .wait0
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.wait1 bit PPU_STATUS
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bvc .wait1
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; set XY scroll
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; compute first PPU_ADDR write
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lda ScrollX
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tax
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lsr
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lsr
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lsr
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sta Temp
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lda ScrollY
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tay
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and #$f8
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asl
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asl
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ora Temp
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pha
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; set PPU_ADDR.1
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lda #0
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sta PPU_ADDR
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; set PPU_SCROLL.1
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sty PPU_SCROLL
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; set PPU_SCROLL.2
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stx PPU_SCROLL
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; set PPU_ADDR.2
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pla
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sta PPU_ADDR
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; modify scroll positions
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inc ScrollX
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inc ScrollY
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; restore registers and return
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RESTORE_REGS
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rti
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;;;;; CONSTANT DATA
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align $100
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Palette:
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hex 1f ;background
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hex 09092c00 ;bg0
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hex 09091900 ;bg1
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hex 09091500 ;bg2
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hex 09092500 ;bg3
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;;;;; CPU VECTORS
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NES_VECTORS
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;;;;; TILE SETS
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org $10000
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incbin "jroatch.chr"
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@ -36,6 +36,7 @@ const JSNES_PRESETS = [
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{id:'bankswitch.c', name:'Bank Switching'},
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{id:'irq.c', name:'IRQ Scanline Counter'},
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{id:'scrollrt.asm', name:'Line-by-line Scrolling (ASM)'},
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{id:'xyscroll.asm', name:'XY Split Scrolling (ASM)'},
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];
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/// JSNES
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Binary file not shown.
2
tss
2
tss
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@ -1 +1 @@
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Subproject commit 5b5ee67fc06956bc7dce51726e98812d2d897eaa
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Subproject commit 61a1691a1de05dca3b694bf603db49ffbaf572cf
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