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https://github.com/sehugg/8bitworkshop.git
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82 lines
1.5 KiB
Plaintext
82 lines
1.5 KiB
Plaintext
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.include "vcs-ca65.inc"
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.setcpu "6502x"
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.macpack longbranch
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.global _kernel_2pp_4pfa
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.global _kernel_2pfasync
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.importzp _k_height
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.importzp _k_ypos
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.importzp _k_bitmap
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.importzp _k_colormap
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.importzp _k_playfield
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.importzp tmp1
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.import _k_asyncpf
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.import _reset_gfx
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_k_pftmp = tmp1 ; no one's using this just now, right?
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.include "kernel.inc"
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.code
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Display Kernel
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; - two double-line players w/ colormap
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; - two missiles, variable height
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; - versatile playfield, 4 lines per change (no cross page)
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; Modifies: _k_ypos, _k_playfield
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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.proc _kernel_2pp_4pfa
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tay
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ldx #0
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@loop:
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; first two lines, fetch PF0 and PF1
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DO_PCOLOR 0
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DO_PCOLOR 1
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DO_DRAW 0,1
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DO_DRAW 1,0
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DO_MISSILE 2
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DO_MISSILE_NOP 3
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DO_VERSATILE_PF_1
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dey
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; second two lines, fetch PF2 and write PF registers
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DO_PCOLOR 0
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DO_PCOLOR 1
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DO_DRAW 0,1
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DO_DRAW 1,0
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DO_MISSILE_NOP 2
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DO_MISSILE 3
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DO_VERSATILE_PF_2
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dey
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jne @loop
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jmp _reset_gfx
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.endproc
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Display Kernel
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; - async playfield, 6 lines per change
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; - playfield data should be page-aligned
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; Modifies: _k_playfield
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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.proc _kernel_2pfasync
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tay
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loop2:
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dey
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ldx #5
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loop:
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DO_PFWRITE_2
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DO_WSYNC
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lda _k_asyncpf,y
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sta _k_pftmp,x
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DO_PFWRITE
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stx COLUPF ; fun vfx rainbow
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dex
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bmi loop2
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dey
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jne loop
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jmp _reset_gfx
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.endproc
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