mirror of
https://github.com/sehugg/8bitworkshop.git
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89 lines
5.3 KiB
NASM
89 lines
5.3 KiB
NASM
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; "HORCB Pal" demo 2018 hxlnt
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; Inspired by Michael Garber's Color Picker
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; http://ballyalley.com/ml/ml_homebrew/colorpicker.asm
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; Assemble with Zmac 1.3
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; From: https://github.com/hxlnt/astrocade
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INCLUDE "hvglib.h" ; Include HVGLIB library
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FrameCount EQU $4F00 ; Reserve a space for a frame counter
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ORG FIRSTC ; Initialize at beginning of cartridge ROM area
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DB $55 ; ... with the code for a normal menued cartridge
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DW MENUST ; Initialize menu
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DW PrgName ; ... with string at PrgName
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DW PrgStart ; ... such that selecting the program enters PrgStart
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PrgName: DB "HORCB PAL" ; String
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DB 0 ; ... which must be followed by 0
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PrgStart: DI ; Disable interrupts
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SYSTEM INTPC ; Begin interpreter mode
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DO SETOUT ; Set output ports
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DB 96*2 ; ... with VBLANK line set to line 96
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DB 0/4 ; ... with color boundary 0 pixels from the left of the screen
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DB 00001000b ; ... with screen interrupts enabled
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DO COLSET ; Set color palettes
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DW Palettes ; ... with the values at Palettes
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DO FILL ; Set background fill
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DW NORMEM ; ... starting at the beginning of screen RAM
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DW 24*BYTEPL ; ... and going for 24 lines
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DB 00011011b ; ... with a fill pattern of four different colored pixels
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DO FILL ; Set background fill
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DW NORMEM+(24*BYTEPL)
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DW 24*BYTEPL ; ... and going for 24 lines
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DB 00000000b ; ... with a solid fill of color 00
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DO FILL ; Set background fill
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DW NORMEM+(48*BYTEPL)
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DW 24*BYTEPL ; ... and going for 24 lines
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DB 11111111b ; ... with a solid fill of color 11
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DO STRDIS ; Set string display
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DB 28 ; ... starting 28 pixels from the left of the screen
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DB 40 ; ... and 40 pixels from the top of the screen
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DB 00001100b ; ... with no enlargement, foreground color = 11, background color = 00
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DW PrgName ; ... with string at PrgName
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EXIT ; Exit interpreter mode
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Loop: IN A,(POT0) ; Let A = controller 1 knob value
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OUT (HORCB),A ; Let horizontal color boundary = A
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CALL UpdateDisp ; Call UpdateDisp subroutine
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JP Loop ; Go back to beginning of infinite loop
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Palettes: DB $F4,$1C,$1F,$5F ; Left color palette (11b, 10b, 01b, 00b)
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DB $ED,$CD,$D5,$8E ; Right color palette (11b, 10b, 01b, 00b)
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UpdateDisp: DI ; Disable interrupts
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PUSH AF ; Push AF to SP
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LD C,A ; Get first hex digit from knob value
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SRL C ; ...
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SRL C ; ...
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SRL C ; ...
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SRL C ; ...
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LD B,0 ; Display first hex digit from knob value
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LD HL,Hex ; ... Load HL with address Hex
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ADD HL,BC ; ... Offset Hex by BC to get first hex digit
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LD A,(HL) ; ... Load A with first hex digit
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LD C,00000100b ; ... Load C with string options
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LD D,40 ; ... Load D with string Y-coordinate
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LD E,120 ; ... Load E with X-coordinate
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SYSTEM (CHRDIS) ; ... Display first digit
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POP AF ; Pop AF off SP
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AND $0F ; Get second hex digit from knob value
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LD C,A ; ...
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LD B,0 ; Display second hex digit from knob value
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LD HL,Hex ; ... Load HL with address Hex
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ADD HL,BC ; ... Offset Hex by BC to get second hex digit
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LD A,(HL) ; ... Load A with second hex digit
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LD C,00000100b ; ... Load C with string options
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LD D,40 ; ... Load D with Y-coordinate
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LD E,128 ; ... Load E with X-coordinate
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SYSTEM (CHRDIS) ; ... Display second digit
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LD A,(FrameCount) ; Increment frame counter
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INC A ; ...
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LD (FrameCount),A ; ...
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AND 00000111b ; Every fourth frame, run AnimBars
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CP 00000100b ; ...
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JR Z, AnimBars ; ...
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JP AnimDone ; Otherwise, skip AnimBars
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AnimBars: SYSSUK RANGED ; Load a random 8-bit number in A
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DEFB 0 ; ...
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LD BC,24*BYTEPL ; Load BC with one scanline's length
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LD DE,NORMEM+(72*BYTEPL)
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SYSTEM FILL ; Fill remainder of screen with repeating random tile
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AnimDone: EI ; Enable interrupts
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RET ; Return from subroutine
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Hex: DB "0123456789ABCDEF"
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