;
; Graphics driver for the 40x24x4 (CIO mode 3, ANTIC mode 8) on the Atari.
;
; Fatih Aygun (2009)
;

	.include	"atari.inc"
	.include 	"zeropage.inc"

	.include 	"tgi-kernel.inc"
	.include        "tgi-mode.inc"
	.include        "tgi-error.inc"

	.macpack        generic

; ******************************************************************************

	; ----------------------------------------------------------------------
	;
	; Constants and tables
	;
	; ----------------------------------------------------------------------

; Graphics mode
	grmode = 3
; X resolution
	x_res = 40
; Y resolution
	y_res = 24
; Number of colors
	colors = 4
; Pixels per byte
	ppb = 4
; Screen memory size in bytes
	scrsize = x_res * y_res / ppb
; Pixel aspect ratio
	aspect = $0100				; 1:1
; Free memory needed
	mem_needed = 1
; Number of screen pages
	pages = 1

.rodata
	mask_table:				; Mask table to set pixels
		.byte	%11000000, %00110000, %00001100, %00000011
	masks:					; Color masks
		.byte	%00000000, %01010101, %10101010, %11111111
	bar_table:				; Mask table for BAR
		.byte	%11111111, %00111111, %00001111, %00000011, %00000000
	default_palette:
		.byte	$00, $0E, $32, $96

.code

; ******************************************************************************

.proc SETPALETTE

	; ----------------------------------------------------------------------
	;
	; SETPALETTE: Set the palette (in ptr1)
	;
	; ----------------------------------------------------------------------

.code
	; Copy the palette
	ldy     #colors - 1
loop:	lda     (ptr1),y
	sta     palette,y
	dey
	bpl     loop

	; Get the color entries from the palette
	lda	palette
	sta	COLOR4
	lda	palette + 1
	sta	COLOR0
	lda	palette + 2
	sta	COLOR1
	lda	palette + 3
	sta	COLOR2

	; Done, reset the error code
        lda     #TGI_ERR_OK
        sta     error
        rts
.endproc

.include "atari_tgi_common.inc"