mirror of
https://github.com/Pixinn/gameoflife-appleii.git
synced 2024-11-18 20:06:01 +00:00
349 lines
8.0 KiB
NASM
Executable File
349 lines
8.0 KiB
NASM
Executable File
.include "apple2.inc"
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.include "zeropage.inc"
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.import pusha
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.import popa
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.import pushax
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.import popax
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.export _mode_text
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.export _gfx_init
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.export _gfx_fill
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.export _gfx_pixel
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.export _gfx_get_pixel
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.export _gfx_refresh
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.define FULLSCREEN #0
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.define SPLIT #1
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.define LOWRES #0
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.define HIRES #1
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.define PAGE_1 #1
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.define PAGE_2 #2
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.BSS
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Page_Current: .byte 0
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Page_Future: .byte 0
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.DATA
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;Pages are composed of lines. Here are their 1st pixel adress
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Page1: .word $400, $480, $500, $580, $600, $680, $700, $780, $428, $4A8, $528, $5A8, $628, $6A8, $728, $7A8, $450, $4D0, $550, $5D0, $650, $6D0, $750, $7D0
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Page2: .word $800, $880, $900, $980, $A00, $A80, $B00, $B80, $828, $8A8, $928, $9A8, $A28, $AA8, $B28, $BA8, $850, $8D0, $950, $9D0, $A50, $AD0, $B50, $BD0
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.CODE
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;will put the adress of the future page into ptr1
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.macro GET_PAGE_FUTURE
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.local get_page_future_page_1, get_page_future_page_2, get_page_future_end
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LDA Page_Current
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CMP PAGE_1
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BEQ get_page_future_page_2
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;storing the low and high bytes of the page address into ptr1
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get_page_future_page_1:
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LDA #<Page1
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STA ptr1
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LDA #>Page1
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STA ptr1+1
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CLC
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BCC get_page_future_end
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get_page_future_page_2:
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LDA #<Page2
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STA ptr1
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LDA #>Page1
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STA ptr1+1
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get_page_future_end:
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.endmacro
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;**************************
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;void __fastcall__ mode_text( void );
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_mode_text:
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LDA $C054 ;page 1
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LDA $C051 ;text
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RTS
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;**************************
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;void __fastcall__ gfx_init( uint8_t RES, uint8_t MODE )
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; Switches to the desired res and mode.
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; Always displays page 1
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_gfx_init:
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res: TAX
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LDY #0
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LDA (sp),Y
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CMP LOWRES
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BNE hires
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lores: LDA $C056
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CLC
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BCC mode
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hires: LDA $C057
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mode: CPX FULLSCREEN
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BNE split
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fullscr:LDA $C052
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CLC
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BCC init_end
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split: LDA $C053
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init_end:
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LDA $C054 ;page 1
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LDA $C050 ;graphics
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LDA PAGE_1
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STA Page_Current
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JSR popa ;the parameter on stack
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RTS
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;**************************
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;void __fastcall__ gfx_fill( uint8_t color )
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; Fills the screen with the given color
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_gfx_fill:
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; TODO SWITCH PAGES !!
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;saving the context
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;WARNING context us not saved properly: ptr+1 not saved!
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TAX
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LDA tmp1
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JSR pusha
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LDA ptr1
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JSR pusha
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LDA ptr2
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JSR pusha
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TXA
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;duplicate nybble color
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STA tmp1
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ASL A
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ASL A
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ASL A
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ASL A
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ORA tmp1
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STA tmp1
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;select to page to write into
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LDA Page_Current
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CMP PAGE_1
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BNE page_2
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;storing the low and high bytes of the page address into ptr1
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page_1: LDA #<Page1
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STA ptr1
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LDA #>Page1
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STA ptr1+1
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CLC
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BCC fill
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page_2: LDA #<Page2
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STA ptr1
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LDA #>Page1
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STA ptr1+1
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fill:
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;iterating on X: the line number
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for_lines:
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;getting the 16 bit line adress and storing it in ptr2
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TXA
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ASL
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TAY
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LDA (ptr1),Y
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STA ptr2
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INY
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LDA (ptr1),Y
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STA ptr2+1
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;iterating on Y to fill a line
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LDY #0
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fill_line:
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LDA tmp1 ;reload the color
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STA (ptr2),Y ;color the current pixel
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INY ;next pixel
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CPY #40 ;nb pixels per line
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BNE fill_line
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INX
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CPX #20 ;nb lines
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BNE for_lines
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fill_end:
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;displaying the page we filled
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; TODO SWITCH PAGES !!
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;restoring the context
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JSR popa
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STA ptr2
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JSR popa
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STA ptr1
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JSR popa
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STA tmp1
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RTS
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;**************************
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;void __fastcall__ gfx_pixel( uint8_t color, uint8_t coord_x, uint8_t coord_y )
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; Draws a pixel at the given coordinates on the Page_Future
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_gfx_pixel:
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;aliases
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coord_y := tmp3
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;saving the context
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PHA
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LDA tmp3
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JSR pusha
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LDA tmp2
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JSR pusha
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LDA tmp1
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JSR pusha
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LDA ptr1
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LDX ptr1+1
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JSR pushax
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LDA ptr2
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LDX ptr2+1
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JSR pushax
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PLA
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STA coord_y ;coord_y
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; Modify the color depending on the pixel's line parity
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AND #1
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BEQ even
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odd: ; pixel is on an odd line
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LDA #$0F ;To or with the other nybble when writting the pixel
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STA tmp1
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LDY #(1+7) ;there were 7 pushes to save registers
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LDA (sp),Y ;color
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ASL ;shift the color to put it on high nybble
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ASL
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ASL
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ASL
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CLC
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BCC oddeven
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even: ; pixel is on an even line
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LDA #$F0 ;To or with the other nybble when writting the pixel
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STA tmp1
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LDY #(1+7) ;there were 7 pushes to save registers
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LDA (sp),Y ;color
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oddeven:
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STA tmp2
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; FIXME : switching to Page 2 does not work
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; dont get the future page and work on page 1
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;GET_PAGE_FUTURE
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LDA #<Page1
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STA ptr1
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LDA #>Page1
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STA ptr1+1
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; get the line adress and store it in ptr2
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LDA coord_y
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LSR
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ASL
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TAY
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LDA (ptr1),Y
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STA ptr2
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INY
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LDA (ptr1),Y
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STA ptr2+1
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; get coord_x
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LDY #7 ;there were 4 pushes to save registers
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LDA (sp),Y
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; draw
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TAY
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LDA (ptr2),Y ;a color may have been present on the other nybble
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AND tmp1 ;clearing the pixel's nybble
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ORA tmp2 ;adding the color to the pixel's nyyble
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STA (ptr2),Y
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;restoring the context
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JSR popax
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STA ptr2
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STX ptr2+1
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JSR popax
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STA ptr1
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STX ptr1+1
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JSR popa
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STA tmp1
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JSR popa
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STA tmp2
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JSR popa
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STA tmp3
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JSR popa ;the 2 parameters on stack
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JSR popa
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RTS
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;**************************
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;uint8_t __fastcall__ gfx_get_pixel( uint8_t coord_x, uint8_t coord_y )
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; Returns the pixel's color
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_gfx_get_pixel:
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TAX ; coord_y
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;saving the context
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LDA ptr1
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JSR pusha
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LDA ptr2
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JSR pusha
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; Page's address to ptr1
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LDA #<Page1
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STA ptr1
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LDA #>Page1
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STA ptr1+1
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; Line's adress to ptr2
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TXA
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LSR
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ASL
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TAY
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LDA (ptr1),Y
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STA ptr2
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INY
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LDA (ptr1),Y
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STA ptr2+1
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; get coord_x
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LDY #2 ;there were 4 pushes to save registers
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LDA (sp),Y
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TAY
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TXA
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AND #1 ; test line parity to read the correct nybble
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BEQ even_2
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odd_2: LDA (ptr2),Y
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LSR ; color is in lo nybble
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LSR
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LSR
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LSR
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CLC
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BCC end_2
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even_2: LDA (ptr2),Y
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AND #$0F ; color is in hi nybble
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end_2: TAX
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;restoring the context
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JSR popa
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STA ptr2
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JSR popa
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STA ptr1
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JSR popa ;1st parameter
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; return value
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TXA
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LDX #0
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RTS
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;**************************
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;void __fastcall__ gfx_refresh( void )
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; Updates the screen by displaying the Future Page which becomes Current
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_gfx_refresh:
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LDA Page_Current
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CMP PAGE_1
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BEQ switch_to_page_2
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switch_to_page_1:
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LDA $C054 ;page 1
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LDA PAGE_1
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CLC
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BCC switch_to_page_end
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switch_to_page_2:
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LDA $C055 ;page 2
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LDA PAGE_2
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switch_to_page_end:
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STA Page_Current
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RTS
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