43 lines
518 B
ArmAsm
43 lines
518 B
ArmAsm
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.importzp TEMP, _oam_off, sp
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.import popa, popax
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.include "nes.inc"
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.include "zpvars.inc"
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;unsigned char __fastcall__ oam_spr(unsigned char x,unsigned char y,unsigned char chrnum,unsigned char attr,unsigned char sprid);
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.export _oam_spr
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_oam_spr:
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tax
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ldy #0 ;four popa calls replacement
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lda (sp),y
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iny
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sta OAM_BUF+2,x
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lda (sp),y
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iny
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sta OAM_BUF+1,x
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lda (sp),y
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iny
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sta OAM_BUF+0,x
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lda (sp),y
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sta OAM_BUF+3,x
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lda <sp
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clc
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adc #4
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sta <sp
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bcc @1
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inc <sp+1
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@1:
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txa
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clc
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adc #4
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ldx #$00
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rts
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