mirror of
https://github.com/cc65/cc65.git
synced 2024-12-26 08:32:00 +00:00
dacee3b9ed
All but one TGI drivers didn't use IRQs. Especially when the TGI driver kernel was the only .interruptor this meant quite some unnecessary overhead because it pulled in the whole IRQ infrastructure. The one driver using IRQs (the graphics driver for the 160x102x16 mode on the Lynx) now uses a library reference to set up a JMP to its IRQ handler.
497 lines
13 KiB
ArmAsm
497 lines
13 KiB
ArmAsm
;
|
|
; Graphics driver for the lores 64x56x2 mode on the NES
|
|
;
|
|
; Stefan Haubenthal, 2009-03-10
|
|
; Based on Maciej Witkowiak's line routine.
|
|
;
|
|
|
|
.include "zeropage.inc"
|
|
|
|
.include "tgi-kernel.inc"
|
|
.include "tgi-error.inc"
|
|
.include "nes.inc"
|
|
.include "get_tv.inc"
|
|
.import _clrscr, setcursor, putchar
|
|
.import paldata
|
|
|
|
.macpack generic
|
|
.macpack module
|
|
|
|
|
|
; ------------------------------------------------------------------------
|
|
; Header. Includes jump table and constants.
|
|
|
|
module_header _nes_64_56_2_tgi
|
|
|
|
; First part of the header is a structure that has a magic and defines the
|
|
; capabilities of the driver
|
|
|
|
.byte $74, $67, $69 ; "tgi"
|
|
.byte TGI_API_VERSION ; TGI API version number
|
|
.addr $0000 ; Library reference
|
|
xres: .word charsperline*2 ; Max X resolution
|
|
yres: .word 56 ; Max Y resolution
|
|
.byte 2 ; Number of drawing colors
|
|
.byte 1 ; Number of screens available
|
|
.byte 2 ; System font X size
|
|
.byte 2 ; System font Y size
|
|
.word $0100 ; Aspect ratio
|
|
.byte 0 ; TGI driver flags
|
|
|
|
; Next comes the jump table. Currently all entries must be valid and may point
|
|
; to an RTS for test versions (function not implemented).
|
|
|
|
.addr INSTALL
|
|
.addr UNINSTALL
|
|
.addr INIT
|
|
.addr DONE
|
|
.addr GETERROR
|
|
.addr CONTROL
|
|
.addr CLEAR
|
|
.addr SETVIEWPAGE
|
|
.addr SETDRAWPAGE
|
|
.addr SETCOLOR
|
|
.addr SETPALETTE
|
|
.addr GETPALETTE
|
|
.addr GETDEFPALETTE
|
|
.addr SETPIXEL
|
|
.addr GETPIXEL
|
|
.addr LINE
|
|
.addr BAR
|
|
.addr TEXTSTYLE
|
|
.addr OUTTEXT
|
|
|
|
; ------------------------------------------------------------------------
|
|
; Data.
|
|
|
|
; Variables mapped to the zero page segment variables. Some of these are
|
|
; used for passing parameters to the driver.
|
|
|
|
X1 = ptr1
|
|
Y1 = ptr2
|
|
X2 = ptr3
|
|
Y2 = ptr4
|
|
RADIUS = tmp1
|
|
|
|
ADDR = tmp1
|
|
TEMP = tmp3
|
|
TEMP2 = tmp4
|
|
TEMP3 = sreg
|
|
TEMP4 = sreg+1
|
|
|
|
; Line routine stuff (must be on zpage)
|
|
PB = ptr3 ; (2) LINE
|
|
UB = ptr4 ; (2) LINE
|
|
ERR = regsave ; (2) LINE
|
|
NX = regsave+2 ; (2) LINE
|
|
|
|
; Absolute variables used in the code
|
|
|
|
.bss
|
|
|
|
MEM: .res charsperline*2*56/4
|
|
MEMEND:
|
|
ERROR: .res 1 ; Error code
|
|
COLOR: .res 1 ; Current color
|
|
PALETTE: .res 2 ; The current palette
|
|
|
|
; Line routine stuff
|
|
|
|
OGora:
|
|
COUNT: .res 2
|
|
OUkos:
|
|
NY: .res 2
|
|
Y3:
|
|
DX: .res 1
|
|
DY: .res 1
|
|
AY: .res 1
|
|
|
|
; Constants and tables
|
|
|
|
.rodata
|
|
|
|
DEFPALETTE: .byte $0, $1
|
|
OFFSET: .byte 8, 4, 2, 1
|
|
; 00 00 00 00 01 01 01 01
|
|
; 00 01 10 11 00 01 10 11
|
|
CODE: .byte 32, 29, 26, 25, 28, 24+128, 31+128, 30+128
|
|
; 10 10 10 10 11 11 11 11
|
|
; 00 01 10 11 00 01 10 11
|
|
.byte 30, 31, 24, 28+128, 25+128, 26+128, 29+128, 32+128
|
|
|
|
.code
|
|
|
|
; ------------------------------------------------------------------------
|
|
; INSTALL routine. Is called after the driver is loaded into memory. May
|
|
; initialize anything that has to be done just once. Is probably empty
|
|
; most of the time.
|
|
;
|
|
; Must set an error code: NO
|
|
;
|
|
|
|
INSTALL:
|
|
jsr _get_tv
|
|
cmp #TV::NTSC
|
|
beq ntsc
|
|
; TODO ROM!
|
|
inc yres
|
|
inc yres
|
|
ntsc:; rts
|
|
|
|
; ------------------------------------------------------------------------
|
|
; UNINSTALL routine. Is called before the driver is removed from memory. May
|
|
; clean up anything done by INSTALL but is probably empty most of the time.
|
|
;
|
|
; Must set an error code: NO
|
|
;
|
|
|
|
UNINSTALL:
|
|
rts
|
|
|
|
; ------------------------------------------------------------------------
|
|
; INIT: Changes an already installed device from text mode to graphics
|
|
; mode.
|
|
; Note that INIT/DONE may be called multiple times while the driver
|
|
; is loaded, while INSTALL is only called once, so any code that is needed
|
|
; to initializes variables and so on must go here. Setting palette and
|
|
; clearing the screen is not needed because this is called by the graphics
|
|
; kernel later.
|
|
; The graphics kernel will never call INIT when a graphics mode is already
|
|
; active, so there is no need to protect against that.
|
|
;
|
|
; Must set an error code: YES
|
|
;
|
|
|
|
INIT:
|
|
|
|
; Done, reset the error code
|
|
|
|
lda #TGI_ERR_OK
|
|
sta ERROR
|
|
; rts
|
|
|
|
; ------------------------------------------------------------------------
|
|
; DONE: Will be called to switch the graphics device back into text mode.
|
|
; The graphics kernel will never call DONE when no graphics mode is active,
|
|
; so there is no need to protect against that.
|
|
;
|
|
; Must set an error code: NO
|
|
;
|
|
|
|
DONE:
|
|
rts
|
|
|
|
; ------------------------------------------------------------------------
|
|
; GETERROR: Return the error code in A and clear it.
|
|
|
|
GETERROR:
|
|
lda ERROR
|
|
ldx #TGI_ERR_OK
|
|
stx ERROR
|
|
rts
|
|
|
|
; ------------------------------------------------------------------------
|
|
; CONTROL: Platform/driver specific entry point.
|
|
;
|
|
; Must set an error code: YES
|
|
;
|
|
|
|
CONTROL:
|
|
lda #TGI_ERR_INV_FUNC
|
|
sta ERROR
|
|
rts
|
|
|
|
; ------------------------------------------------------------------------
|
|
; CLEAR: Clears the screen.
|
|
;
|
|
; Must set an error code: NO
|
|
;
|
|
|
|
CLEAR:
|
|
ldx #<MEM
|
|
stx TEMP
|
|
ldx #>MEM
|
|
stx TEMP+1
|
|
lda #0
|
|
tay
|
|
@L1: sta (TEMP),y
|
|
iny
|
|
bne @L1
|
|
inc TEMP+1
|
|
inx
|
|
cpx #>MEMEND
|
|
bne @L1
|
|
jmp _clrscr
|
|
|
|
; ------------------------------------------------------------------------
|
|
; SETCOLOR: Set the drawing color (in A). The new color is already checked
|
|
; to be in a valid range (0..maxcolor-1).
|
|
;
|
|
; Must set an error code: NO (will only be called if color ok)
|
|
;
|
|
|
|
SETCOLOR:
|
|
sta COLOR
|
|
; rts
|
|
|
|
; ------------------------------------------------------------------------
|
|
; SETVIEWPAGE: Set the visible page. Called with the new page in A (0..n).
|
|
; The page number is already checked to be valid by the graphics kernel.
|
|
;
|
|
; Must set an error code: NO (will only be called if page ok)
|
|
;
|
|
|
|
SETVIEWPAGE:
|
|
|
|
; ------------------------------------------------------------------------
|
|
; SETDRAWPAGE: Set the drawable page. Called with the new page in A (0..n).
|
|
; The page number is already checked to be valid by the graphics kernel.
|
|
;
|
|
; Must set an error code: NO (will only be called if page ok)
|
|
;
|
|
|
|
SETDRAWPAGE:
|
|
rts
|
|
|
|
; ------------------------------------------------------------------------
|
|
; SETPALETTE: Set the palette (not available with all drivers/hardware).
|
|
; A pointer to the palette is passed in ptr1. Must set an error if palettes
|
|
; are not supported
|
|
;
|
|
; Must set an error code: YES
|
|
;
|
|
|
|
SETPALETTE:
|
|
; Wait for v-blank
|
|
@wait: lda PPU_STATUS
|
|
bpl @wait
|
|
|
|
lda #$3F
|
|
sta PPU_VRAM_ADDR2
|
|
lda #$00
|
|
sta PPU_VRAM_ADDR2
|
|
|
|
ldy #0
|
|
lda (ptr1),y
|
|
sta PALETTE
|
|
tax
|
|
lda paldata,x
|
|
; sta PPU_VRAM_IO
|
|
|
|
iny
|
|
lda (ptr1),y
|
|
sta PALETTE+1
|
|
tax
|
|
lda paldata,x
|
|
sta PPU_VRAM_IO
|
|
|
|
lda #TGI_ERR_OK
|
|
sta ERROR
|
|
rts
|
|
|
|
; ------------------------------------------------------------------------
|
|
; GETPALETTE: Return the current palette in A/X. Even drivers that cannot
|
|
; set the palette should return the default palette here, so there's no
|
|
; way for this function to fail.
|
|
;
|
|
; Must set an error code: NO
|
|
;
|
|
|
|
GETPALETTE:
|
|
lda #<PALETTE
|
|
ldx #>PALETTE
|
|
rts
|
|
|
|
; ------------------------------------------------------------------------
|
|
; GETDEFPALETTE: Return the default palette for the driver in A/X. All
|
|
; drivers should return something reasonable here, even drivers that don't
|
|
; support palettes, otherwise the caller has no way to determine the colors
|
|
; of the (not changeable) palette.
|
|
;
|
|
; Must set an error code: NO (all drivers must have a default palette)
|
|
;
|
|
|
|
GETDEFPALETTE:
|
|
lda #<DEFPALETTE
|
|
ldx #>DEFPALETTE
|
|
rts
|
|
|
|
; ------------------------------------------------------------------------
|
|
; SETPIXEL: Draw one pixel at X1/Y1 = ptr1/ptr2 with the current drawing
|
|
; color. The coordinates passed to this function are never outside the
|
|
; visible screen area, so there is no need for clipping inside this function.
|
|
;
|
|
; Must set an error code: NO
|
|
;
|
|
|
|
SETPIXEL:
|
|
ldx Y1 ; y+2<yres
|
|
inx
|
|
inx
|
|
cpx yres
|
|
bcc @L2
|
|
ldx X1 ; x+2<xres
|
|
inx
|
|
inx
|
|
cpx xres
|
|
bcc @L2
|
|
rts
|
|
@L2: lda X1
|
|
lsr
|
|
tay
|
|
lda Y1
|
|
lsr
|
|
tax
|
|
clc
|
|
jsr setcursor
|
|
jsr CALC
|
|
ldx COLOR
|
|
bne @set2
|
|
eor #%00001111
|
|
@set2: sta TEMP3
|
|
|
|
lda (TEMP),y
|
|
ldx COLOR
|
|
bne @set
|
|
and TEMP3
|
|
.byte $2c
|
|
@set: ora TEMP3
|
|
sta (TEMP),y
|
|
tax
|
|
lda CODE,x
|
|
@normal:jmp putchar
|
|
|
|
; ------------------------------------------------------------------------
|
|
; GETPIXEL: Read the color value of a pixel and return it in A/X. The
|
|
; coordinates passed to this function are never outside the visible screen
|
|
; area, so there is no need for clipping inside this function.
|
|
|
|
|
|
GETPIXEL:
|
|
jsr CALC
|
|
sta TEMP3
|
|
lda (TEMP),y
|
|
and TEMP3
|
|
beq @L1
|
|
lda #1
|
|
@L1: ldx #0
|
|
rts
|
|
|
|
; ------------------------------------------------------------------------
|
|
; BAR: Draw a filled rectangle with the corners X1/Y1, X2/Y2, where
|
|
; X1/Y1 = ptr1/ptr2 and X2/Y2 = ptr3/ptr4 using the current drawing color.
|
|
; Contrary to most other functions, the graphics kernel will sort and clip
|
|
; the coordinates before calling the driver, so on entry the following
|
|
; conditions are valid:
|
|
; X1 <= X2
|
|
; Y1 <= Y2
|
|
; (X1 >= 0) && (X1 < XRES)
|
|
; (X2 >= 0) && (X2 < XRES)
|
|
; (Y1 >= 0) && (Y1 < YRES)
|
|
; (Y2 >= 0) && (Y2 < YRES)
|
|
;
|
|
; Must set an error code: NO
|
|
;
|
|
|
|
BAR:
|
|
inc Y2
|
|
@L1: lda X1
|
|
pha
|
|
@L2: jsr SETPIXEL
|
|
inc X1
|
|
lda X2
|
|
cmp X1
|
|
bne @L2
|
|
pla
|
|
sta X1
|
|
inc Y1
|
|
lda Y2
|
|
cmp Y1
|
|
bne @L1
|
|
rts
|
|
|
|
; ------------------------------------------------------------------------
|
|
; TEXTSTYLE: Set the style used when calling OUTTEXT. Text scaling in X and Y
|
|
; direction is passend in X/Y, the text direction is passed in A.
|
|
;
|
|
; Must set an error code: NO
|
|
;
|
|
|
|
TEXTSTYLE:
|
|
rts
|
|
|
|
; ------------------------------------------------------------------------
|
|
; OUTTEXT: Output text at X/Y = ptr1/ptr2 using the current color and the
|
|
; current text style. The text to output is given as a zero terminated
|
|
; string with address in ptr3.
|
|
;
|
|
; Must set an error code: NO
|
|
;
|
|
|
|
OUTTEXT:
|
|
lda ptr1
|
|
lsr
|
|
tay
|
|
lda ptr2
|
|
lsr
|
|
tax
|
|
clc
|
|
jsr setcursor
|
|
ldy #0
|
|
@L1: lda (ptr3),y
|
|
jsr putchar
|
|
iny
|
|
cmp #$0
|
|
bne @L1
|
|
rts
|
|
|
|
; ------------------------------------------------------------------------
|
|
; Calculate all variables to plot the pixel at X1/Y1. If the point is out
|
|
; of range, a carry is returned and INRANGE is set to a value !0 zero. If
|
|
; the coordinates are valid, INRANGE is zero and the carry clear.
|
|
|
|
CALC: lda xres
|
|
sta TEMP
|
|
lda #0
|
|
sta TEMP+1
|
|
ldy Y1
|
|
@L1: lda TEMP
|
|
add xres
|
|
lsr
|
|
sta TEMP
|
|
lda TEMP+1
|
|
adc #0
|
|
lsr
|
|
sta TEMP+1
|
|
dey
|
|
bne @L1
|
|
lda TEMP
|
|
add X1
|
|
lsr
|
|
sta TEMP
|
|
lda TEMP+1
|
|
adc #0
|
|
lsr
|
|
sta TEMP+1
|
|
lda TEMP
|
|
add #<MEM
|
|
sta TEMP
|
|
lda TEMP+1
|
|
adc #>MEM
|
|
sta TEMP+1
|
|
|
|
lda X1
|
|
and #%00000001
|
|
sta TEMP3
|
|
lda Y1
|
|
asl
|
|
and #%00000010
|
|
ora TEMP3
|
|
tax
|
|
lda OFFSET,x
|
|
rts
|
|
|
|
; ------------------------------------------------------------------------
|
|
|
|
.include "../../tgi/tgidrv_line.inc"
|