mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-11-27 01:51:35 +00:00
105 lines
1.4 KiB
PHP
105 lines
1.4 KiB
PHP
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.macro DO_WSYNC
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sta WSYNC
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.endmacro
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; 16-17 cycles
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; modifies _k_ypos
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.macro DO_DRAW_A index
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lda _k_height+index
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dcp _k_ypos+index
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bcs :+
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lda #0
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.byte $2C
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:
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lda (_k_bitmap+index*2),y
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.endmacro
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; 19-20 cycles (unless WSYNC)
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; modifies _k_ypos
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.macro DO_DRAW index,wsync
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DO_DRAW_A index
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.if wsync
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DO_WSYNC
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.endif
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sta GRP0+index
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.endmacro
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; 8 cycles
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.macro DO_PCOLOR index
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lda (_k_colormap+index*2),y
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sta COLUP0+index
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.endmacro
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; 13-14 cycles
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; modifies _k_playfield (can't cross page boundary)
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.macro DO_PF index
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lda (_k_playfield,x)
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sta _k_pftmp + index
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inc _k_playfield
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.endmacro
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; 18 cycles
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.macro DO_PFWRITE
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lda _k_pftmp+0
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sta PF0
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lda _k_pftmp+1
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sta PF1
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lda _k_pftmp+2
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sta PF2
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.endmacro
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; 18 cycles
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.macro DO_PFWRITE_2
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lda _k_pftmp+3
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sta PF0
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lda _k_pftmp+4
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sta PF1
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lda _k_pftmp+5
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sta PF2
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.endmacro
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; 7-8 cycles
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.macro DO_VERSATILE_PF_1
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lda (_k_playfield),y
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tax
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.endmacro
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; 9-10 cycles
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.macro DO_VERSATILE_PF_2
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lda (_k_playfield),y
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sta $40,x ; use TIA mirror
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.endmacro
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; 13 cycles
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; modifies _k_ypos
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.macro DO_MISSILE index
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lda _k_height+index
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dcp _k_ypos+index
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sbc #$fe
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sta ENAM0-2+index
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.endmacro
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; 5 cycles
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; modifies _k_ypos
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.macro DO_MISSILE_NOP index
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dcp _k_ypos+index
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.endmacro
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; 13 cycles
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.macro DO_MISSILE_PIXEL index
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cpy _k_ypos+index
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php
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pla
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sta ENAM0-2+index
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.endmacro
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.macro RESET_GFX
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lda #0
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sta GRP0
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sta GRP1
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sta PF0
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sta PF1
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sta PF2
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.endmacro
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