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90 lines
1.9 KiB
ArmAsm
90 lines
1.9 KiB
ArmAsm
;
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; Graphics driver for the 40x24x4 (CIO mode 3, ANTIC mode 8) on the Atari.
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;
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; Fatih Aygun (2009)
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;
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.include "atari.inc"
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.include "zeropage.inc"
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.include "tgi-kernel.inc"
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.include "tgi-mode.inc"
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.include "tgi-error.inc"
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.macpack generic
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; ******************************************************************************
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; ----------------------------------------------------------------------
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;
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; Constants and tables
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;
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; ----------------------------------------------------------------------
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; Graphics mode
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grmode = 3
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; X resolution
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x_res = 40
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; Y resolution
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y_res = 24
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; Number of colors
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colors = 4
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; Pixels per byte
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ppb = 4
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; Screen memory size in bytes
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scrsize = x_res * y_res / ppb
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; Pixel aspect ratio
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aspect = $00CC ; based on 4/3 display
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; Free memory needed
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mem_needed = 1
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; Number of screen pages
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pages = 1
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.rodata
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mask_table: ; Mask table to set pixels
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.byte %11000000, %00110000, %00001100, %00000011
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masks: ; Color masks
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.byte %00000000, %01010101, %10101010, %11111111
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bar_table: ; Mask table for BAR
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.byte %11111111, %00111111, %00001111, %00000011, %00000000
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default_palette:
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.byte $00, $0E, $32, $96
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.code
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; ******************************************************************************
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.proc SETPALETTE
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; ----------------------------------------------------------------------
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;
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; SETPALETTE: Set the palette (in ptr1)
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;
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; ----------------------------------------------------------------------
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.code
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; Copy the palette
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ldy #colors - 1
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loop: lda (ptr1),y
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sta palette,y
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dey
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bpl loop
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; Get the color entries from the palette
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lda palette
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sta COLOR4
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lda palette + 1
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sta COLOR0
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lda palette + 2
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sta COLOR1
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lda palette + 3
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sta COLOR2
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; Done, reset the error code
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lda #TGI_ERR_OK
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sta error
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rts
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.endproc
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.include "atari_tgi_common.inc"
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