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cliff: optimizing sprite code
This commit is contained in:
Vince Weaver
parent
62f066b46e
commit
8ebe0aeac1
@ -114,10 +114,12 @@ game_loop:
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;=====================
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; draw enemies
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lda #$20 ; backup location
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sta OUTH
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lda #$00
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sta OUTL
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ldx #0
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; lda #$20 ; backup location
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; sta OUTH
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; lda #$00
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; sta OUTL
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lda #8
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sta SPRITE_X
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@ -125,22 +127,24 @@ game_loop:
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lda #100
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sta SPRITE_Y
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lda #<bird0_sprite
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sta INL
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lda #>bird0_sprite
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sta INH
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; lda #<bird0_sprite
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; sta INL
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; lda #>bird0_sprite
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; sta INH
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lda #<bird0_mask
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sta MASKL
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lda #>bird0_mask
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sta MASKH
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; lda #<bird0_mask
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; sta MASKL
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; lda #>bird0_mask
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; sta MASKH
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jsr hgr_draw_sprite
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lda #$21 ; backup location
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sta OUTH
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lda #$00
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sta OUTL
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ldx #1
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; lda #$21 ; backup location
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; sta OUTH
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; lda #$00
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; sta OUTL
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lda #21
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sta SPRITE_X
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@ -148,15 +152,15 @@ game_loop:
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lda #89
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sta SPRITE_Y
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lda #<bird1_sprite
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sta INL
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lda #>bird1_sprite
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sta INH
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; lda #<bird1_sprite
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; sta INL
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; lda #>bird1_sprite
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; sta INH
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lda #<bird1_mask
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sta MASKL
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lda #>bird1_mask
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sta MASKH
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; lda #<bird1_mask
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; sta MASKL
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; lda #>bird1_mask
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; sta MASKH
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jsr hgr_draw_sprite
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@ -222,3 +226,28 @@ priority_data:
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sprites:
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.include "sprites/enemy_sprites.inc"
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sprites_xsize:
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.byte 3, 3
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sprites_ysize:
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.byte 16,12
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sprites_data_l:
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.byte <bird0_sprite,<bird1_sprite
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sprites_data_h:
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.byte >bird0_sprite,>bird1_sprite
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sprites_mask_l:
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.byte <bird0_mask,<bird1_mask
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sprites_mask_h:
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.byte >bird0_mask,>bird1_mask
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save_xsize:
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.byte 0, 0
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save_ysize:
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.byte 0, 0
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save_x:
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.byte 0, 0
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save_y:
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.byte 0, 0
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@ -5,57 +5,69 @@
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;
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; *cannot* handle sprites bigger than a 256 byte page
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; SPRITE in INL/INH
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; note: xsize,ysize in first two bytes
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; total bytes in text two bytes
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; mask data immediately follows sprite data
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; Location at SPRITE_X SPRITE_Y
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; note: sprite_x is column, so Xcoord/7
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; Save at OUTL/OUTH
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; which sprite in X
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hgr_draw_sprite:
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; backup location in case we need to restore
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lda SPRITE_X
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sta save_x,X
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lda SPRITE_Y
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sta save_y,X
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; handle xsize
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lda sprites_xsize,X
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sta save_xsize,X
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clc
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adc SPRITE_X
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sta sprite_width_end_smc+1 ; self modify for end of line
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sta osprite_width_end_smc+1 ; self modify for end of line
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; handle ysize
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lda sprites_ysize,X
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sta save_ysize,X
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sta sprite_ysize_smc+1 ; self modify for end row
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sta osprite_ysize_smc+1 ; self modify for end row
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; point smc to sprite
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lda sprites_data_l,X
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sta sprite_smc1+1
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sta osprite_smc1+1
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lda sprites_data_h,X
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sta sprite_smc1+2
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sta osprite_smc1+2
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; point smc to mask
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lda sprites_mask_l,X
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sta sprite_mask_smc1+1
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sta osprite_mask_smc1+1
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lda sprites_mask_h,X
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sta sprite_mask_smc1+2
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sta osprite_mask_smc1+2
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; pick if even or odd code
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lda SPRITE_X
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ror
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bcs hgr_draw_sprite_odd
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hgr_draw_sprite_even:
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ldy #0
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lda (INL),Y ; load xsize
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sta (OUTL),Y ; store to screen backup
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clc
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adc SPRITE_X
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sta sprite_width_end_smc+1 ; self modify for end of line
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iny ; load ysize
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lda (INL),Y
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sta (OUTL),Y ; store to screen backup
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sta sprite_ysize_smc+1 ; self modify for end row
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; point smc to sprite
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lda INL
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sta sprite_smc1+1
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lda INH
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sta sprite_smc1+2
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sta INH
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; point smc to backup
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lda OUTL
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sta backup_sprite_smc1+1
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lda OUTH
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sta backup_sprite_smc1+2
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; point smc to mask
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lda MASKL
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sta sprite_mask_smc1+1
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lda MASKH
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sta sprite_mask_smc1+2
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ldx #0 ; X is pointer offset
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stx CURRENT_ROW ; actual row
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ldx #2 ; start two bytes in (past x/y)
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; ldx #0 ; start two bytes in (past x/y)
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hgr_sprite_yloop:
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@ -107,43 +119,17 @@ sprite_ysize_smc:
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rts
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;============================================
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hgr_draw_sprite_odd:
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ldy #0
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lda (INL),Y ; load xsize
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sta (OUTL),Y ; store to screen backup
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clc
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adc SPRITE_X
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sta osprite_width_end_smc+1 ; self modify for end of line
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iny
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lda (INL),Y ; load ysize
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sta (OUTL),Y ; store to screen backup
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sta osprite_ysize_smc+1 ; self modify for end row
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; point smc to sprite
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lda INL
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sta osprite_smc1+1
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lda INH
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sta osprite_smc1+2
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; point smc to backup
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lda OUTL
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sta obackup_sprite_smc1+1
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lda OUTH
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sta obackup_sprite_smc1+2
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; point smc to mask
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lda MASKL
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sta osprite_mask_smc1+1
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lda MASKH
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sta osprite_mask_smc1+2
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ldx #0 ; X is pointer offset
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stx CURRENT_ROW ; actual row
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ldx #2
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; ldx #2
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ohgr_sprite_yloop:
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@ -221,18 +207,3 @@ osprite_ysize_smc:
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rts
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.if 0
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;hgr_sprite_page_smc:
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; eor #$00
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backup_sprite1 = $1800
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backup_sprite2 = $1900
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.endif
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@ -3,10 +3,10 @@ HGR_SPRITE = ../../../../utils/hgr-utils/hgr_make_sprite
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all: enemy_sprites.inc
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enemy_sprites.inc: enemy_sprites.png
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$(HGR_SPRITE) -s -l bird0_sprite enemy_sprites.png 210 50 230 66 > enemy_sprites.inc
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$(HGR_SPRITE) -s -l bird0_mask enemy_sprites.png 238 50 258 66 >> enemy_sprites.inc
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$(HGR_SPRITE) -s -l bird1_sprite enemy_sprites.png 210 74 230 88 >> enemy_sprites.inc
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$(HGR_SPRITE) -s -l bird1_mask enemy_sprites.png 238 74 258 88 >> enemy_sprites.inc
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$(HGR_SPRITE) -l bird0_sprite enemy_sprites.png 210 50 230 66 > enemy_sprites.inc
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$(HGR_SPRITE) -l bird0_mask enemy_sprites.png 238 50 258 66 >> enemy_sprites.inc
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$(HGR_SPRITE) -l bird1_sprite enemy_sprites.png 210 74 230 88 >> enemy_sprites.inc
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$(HGR_SPRITE) -l bird1_mask enemy_sprites.png 238 74 258 88 >> enemy_sprites.inc
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clean:
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