281 lines
4.3 KiB
ArmAsm
281 lines
4.3 KiB
ArmAsm
;
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; spritedemo
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;
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; Created by Quinn Dunki on 7/19/16
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; Copyright (c) 2015 One Girl, One Laptop Productions. All rights reserved.
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;
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.org $6000
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.include "macros.s"
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; Softswitches
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TEXT = $c050
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HIRES1 = $c057
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HIRES2 = $c058
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; ROM entry points
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COUT = $fded
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ROMWAIT = $fca8
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; Zero page locations we use (unused by Monitor, Applesoft, or ProDOS)
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PARAM0 = $06
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PARAM1 = $07
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PARAM2 = $08
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PARAM3 = $09
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SCRATCH0 = $19
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SCRATCH1 = $1a
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; Macros
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.macro BLITBYTE xPos,yPos,addr
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lda #xPos
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sta PARAM0
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lda #yPos
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sta PARAM1
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lda #<addr
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sta PARAM2
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lda #>addr
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sta PARAM3
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jsr BlitSpriteOnByte
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.endmacro
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.macro BLIT xPos,yPos,addr
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lda #xPos
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sta PARAM0
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lda #yPos
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sta PARAM1
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lda #<addr
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sta PARAM2
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lda #>addr
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sta PARAM3
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jsr BlitSprite
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.endmacro
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.macro WAIT
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lda #$80
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jsr $fca8
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.endmacro
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main:
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jsr EnableHires
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lda #$00
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jsr LinearFill
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ldx #0
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loop:
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txa
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asl
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asl
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sta PARAM0
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lda #0
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sta PARAM1
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lda #<BOX_MAG_SHIFT0
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sta PARAM2
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lda #>BOX_MAG_SHIFT0
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sta PARAM3
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jsr BlitSprite
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lda #88
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sta PARAM1
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lda #<BOX_GRN_SHIFT0
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sta PARAM2
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lda #>BOX_GRN_SHIFT0
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sta PARAM3
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jsr BlitSprite
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lda #96
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sta PARAM1
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lda #<BOX_BLU_SHIFT0
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sta PARAM2
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lda #>BOX_BLU_SHIFT0
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sta PARAM3
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jsr BlitSprite
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lda #184
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sta PARAM1
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lda #<BOX_ORG_SHIFT0
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sta PARAM2
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lda #>BOX_ORG_SHIFT0
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sta PARAM3
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jsr BlitSprite
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inx
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cpx #35
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bne loop
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; BlitSprite
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; Trashes everything, including parameters
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; PARAM0: X Pos
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; PARAM1: Y Pos
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; PARAM2: Sprite Ptr LSB
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; PARAM3: Sprite Ptr MSB
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;
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BlitSprite:
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SAVE_AXY
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clc ; Compute sprite data base 2
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ldx PARAM0 ; 3
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lda HGRROWBYTES_BITSHIFT,x ; 4
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adc PARAM2 ; 3
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sta PARAM2 ; 3
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lda #0 ; 2
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adc PARAM3 ; 3
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sta PARAM3 ; 3
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lda #7 ; 2
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sta SCRATCH0 ; Tracks row index 3
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asl ; Multiply by byte width 2
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asl ; 2
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sta SCRATCH1 ; Tracks total bytes 3
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ldy #0 ; 2
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; 37 cycles overhead
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blitSprite_Yloop:
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clc ; Calculate Y line on screen 2
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lda SCRATCH0 ; 3
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adc PARAM1 ; 3
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tax ; 2
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lda HGRROWS_H,x ; Compute hires row 4
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sta blitSprite_smc+2 ; Self-modifying code 4
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sta blitSprite_smc+5 ; 4
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lda HGRROWS_L,x ; 4
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sta blitSprite_smc+1 ; 4
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sta blitSprite_smc+4 ; 4
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ldx PARAM0 ; Compute hires horizontal byte 3
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lda HGRROWBYTES,x ; 4
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tax ; 2
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blitSprite_Xloop:
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lda (PARAM2),y ; 5
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blitSprite_smc:
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ora $2000,x
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sta $2000,x ; 5
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inx ; 2
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iny ; 2
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tya ; End of row? 2
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and #$03 ; If last two bits are zero, we've wrapped a row 2
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bne blitSprite_Xloop ; 2
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dec SCRATCH0 ; 5
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bpl blitSprite_Yloop ; 3
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; 71 cycles per row
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RESTORE_AXY
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; BlitSpriteOnByte
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; Trashes everything
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; PARAM0: X Byte
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; PARAM1: Y Pos
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; PARAM2: Sprite Ptr MSB
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; PARAM3: Sprite Ptr LSB
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;
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BlitSpriteOnByte:
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ldy #7
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blitSpriteOnByte_loop:
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clc
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tya
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adc PARAM1 ; Calculate Y line
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tax
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lda HGRROWS_H,x ; Compute hires row
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sta blitSpriteOnByte_smc+2
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lda HGRROWS_L,x
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sta blitSpriteOnByte_smc+1
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ldx PARAM0 ; Compute hires column
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lda (PARAM2),y
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blitSpriteOnByte_smc:
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sta $2000,x
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dey
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bpl blitSpriteOnByte_loop
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; EnableHires
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; Trashes A
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;
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EnableHires:
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lda TEXT
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lda HIRES1
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lda HIRES2
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; LinearFill
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; A: Byte value to fill
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; Trashes all registers
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;
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LinearFill:
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ldx #0
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linearFill_outer:
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pha
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lda HGRROWS_H,x
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sta linearFill_inner+2
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lda HGRROWS_L,x
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sta linearFill_inner+1
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pla
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ldy #39
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linearFill_inner:
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sta $2000,y
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dey
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bpl linearFill_inner
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inx
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cpx #192
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bne linearFill_outer
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; VenetianFill
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; A: Byte value to fill
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; Trashes all registers
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;
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VenetianFill:
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ldx #$3f
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venetianFill_outer:
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stx venetianFill_inner+2
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ldy #$00
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venetianFill_inner:
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sta $2000,y ; Upper byte of address is self-modified
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iny
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bne venetianFill_inner
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dex
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cpx #$1f
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bne venetianFill_outer
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rts
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.include "hgrtableX.s"
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.include "hgrtableY.s"
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.include "spritegen0.s"
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.include "spritegen1.s"
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.include "spritegen2.s"
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.include "spritegen3.s"
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; Suppress some linker warnings - Must be the last thing in the file
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.SEGMENT "ZPSAVE"
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.SEGMENT "EXEHDR"
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.SEGMENT "STARTUP"
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.SEGMENT "INIT"
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.SEGMENT "LOWCODE"
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