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NES TGI Update by Stefan Haubenthal.
git-svn-id: svn://svn.cc65.org/cc65/trunk@5352 b7a2c559-68d2-44c3-8de9-860c34a00d81
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doc/nes.sgml
17
doc/nes.sgml
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@ -93,9 +93,19 @@ allow access to hardware located in the address space.
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<sect>Loadable drivers<p>
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All drivers must be statically linked because no file I/O is available.
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See the documentation for the <htmlurl url="co65.html" name="co65 utility">
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for information on how to do that.
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<sect1>Graphics drivers<p>
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No graphics drivers are currently available for the NES.
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<descrip>
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<tag><tt/nes-64-56-2.tgi/</tag>
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This driver features a resolution of 64×56 with 2 colors using the
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CHR bank.
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</descrip><p>
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<sect1>Extended memory drivers<p>
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@ -104,10 +114,7 @@ No extended memory drivers are currently available for the NES.
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<sect1>Joystick drivers<p>
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A joystick driver for the standard buttons is available, but must be
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statically linked, because no file I/O is available. See the documentation for
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the <htmlurl url="co65.html" name="co65 utility"> for information on how to do
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that.
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A joystick driver for the standard four buttons joypad is available.
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<sect1>Mouse drivers<p>
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@ -65,6 +65,7 @@ OBJS = _scrsize.o \
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revers.o \
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setcursor.o \
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sysuname.o \
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tgi_colors.o \
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waitvblank.o \
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wherex.o \
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wherey.o
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@ -33,7 +33,7 @@ yres: .word 56 ; Max Y resolution
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.byte 2 ; System font X size
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.byte 2 ; System font Y size
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.word $100 ; Aspect ratio
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.byte 0 ; TGI driver flags
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.byte 0 ; TGI driver flags
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; Next comes the jump table. Currently all entries must be valid and may point
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; to an RTS for test versions (function not implemented).
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@ -110,11 +110,11 @@ AY: .res 1
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DEFPALETTE: .byte $0, $1
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OFFSET: .byte 8, 4, 2, 1
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; 00 00 00 00 01 01 01 01
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; 00 01 10 11 00 01 10 11
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; 00 00 00 00 01 01 01 01
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; 00 01 10 11 00 01 10 11
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CODE: .byte 32, 29, 26, 25, 28, 24+128, 31+128, 30+128
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; 10 10 10 10 11 11 11 11
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; 00 01 10 11 00 01 10 11
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; 10 10 10 10 11 11 11 11
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; 00 01 10 11 00 01 10 11
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.byte 30, 31, 24, 28+128, 25+128, 26+128, 29+128, 32+128
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.code
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@ -375,197 +375,6 @@ GETPIXEL:
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@L1: ldx #0
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rts
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; ------------------------------------------------------------------------
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; LINE: Draw a line from X1/Y1 to X2/Y2, where X1/Y1 = ptr1/ptr2 and
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; X2/Y2 = ptr3/ptr4 using the current drawing color.
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;
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; Must set an error code: NO
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;
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LINE:
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; nx = abs(x2 - x1)
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lda X2
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sub X1
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sta NX
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lda X2+1
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sbc X1+1
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tay
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lda NX
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jsr abs
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sta NX
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sty NX+1
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; ny = abs(y2 - y1)
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lda Y2
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sub Y1
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sta NY
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lda Y2+1
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sbc Y1+1
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tay
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lda NY
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jsr abs
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sta NY
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sty NY+1
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; if (x2>=x1)
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ldx #X2
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lda X1
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ldy #0
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jsr icmp
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bcc @L0243
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beq @L0243
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; dx = 1;
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lda #1
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bne @L0244
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; else
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; dx = -1;
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@L0243: lda #$ff
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@L0244: sta DX
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; if (y2>=y1)
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ldx #Y2
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lda Y1
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ldy #0
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jsr icmp
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bcc @L024A
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beq @L024A
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; dy = 1;
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lda #1
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bne @L024B
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; else
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; dy = -1;
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@L024A: lda #$ff
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@L024B: sta DY
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; err = ay = 0;
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lda #0
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sta ERR
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sta ERR+1
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sta AY
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; if (nx<ny) {
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ldx #NX
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lda NY
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ldy #0
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jsr icmp
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bcs @L0255
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; nx <-> ny
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lda NX
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ldx NY
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sta NY
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stx NX
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lda NX+1
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ldx NY+1
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sta NY+1
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stx NX+1
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; ay = dx
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lda DX
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sta AY
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; dx = dy = 0;
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lda #0
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sta DX
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sta DY
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; ny = - ny;
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@L0255: lda NY
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ldy #0
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jsr neg
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sta NY
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sty NY+1
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; for (count=nx;count>0;--count) {
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lda NX
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ldx #0
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sta COUNT
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stx COUNT+1
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@L0166: lda COUNT ; count>0
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ora COUNT+1
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bne @L0167
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rts
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; setpixel(X1,Y1)
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@L0167: jsr SETPIXEL
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; pb = err + ny
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lda ERR
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add NY
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sta PB
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lda ERR+1
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adc NY+1
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sta PB+1
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tax
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; ub = pb + nx
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lda PB
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add NX
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sta UB
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txa
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adc NX+1
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sta UB+1
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; x1 = x1 + dx
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ldx #0
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lda DX
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bpl @L027B
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dex
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@L027B: add X1
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sta X1
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txa
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adc X1+1
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sta X1+1
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; y1 = y1 + ay
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ldx #0
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lda AY
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bpl @L027E
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dex
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@L027E: add Y1
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sta Y1
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txa
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adc Y1+1
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sta Y1+1
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; if (abs(pb)<abs(ub)) {
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lda PB
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ldy PB+1
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jsr abs
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sta TEMP3
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sty TEMP4
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lda UB
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ldy UB+1
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jsr abs
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ldx #TEMP3
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jsr icmp
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bpl @L027F
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; err = pb
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lda PB
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ldx PB+1
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jmp @L0312
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; } else { x1 = x1 + ay
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@L027F:
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ldx #0
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lda AY
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bpl @L0288
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dex
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@L0288: add X1
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sta X1
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txa
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adc X1+1
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sta X1+1
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; y1 = y1 + dy
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ldx #0
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lda DY
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bpl @L028B
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dex
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@L028B: add Y1
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sta Y1
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txa
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adc Y1+1
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sta Y1+1
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; err = ub }
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lda UB
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ldx UB+1
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@L0312:
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sta ERR
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stx ERR+1
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; } (--count)
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sec
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lda COUNT
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sbc #1
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sta COUNT
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bcc @L0260
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jmp @L0166
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@L0260: dec COUNT+1
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jmp @L0166
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; ------------------------------------------------------------------------
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; BAR: Draw a filled rectangle with the corners X1/Y1, X2/Y2, where
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; X1/Y1 = ptr1/ptr2 and X2/Y2 = ptr3/ptr4 using the current drawing color.
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@ -634,49 +443,6 @@ OUTTEXT:
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bne @L1
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rts
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;-------------
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; copies of some runtime routines
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abs:
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; a/y := abs(a/y)
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cpy #0
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bpl absend
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; negay
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neg: eor #$ff
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add #1
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pha
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tya
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eor #$ff
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adc #0
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tay
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pla
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absend: rts
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icmp:
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; compare a/y to zp,x
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sta TEMP ; TEMP/TEMP2 - arg2
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sty TEMP2
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lda $0,x
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pha
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lda $1,x
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tay
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pla
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tax
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tya ; x/a - arg1 (a=high)
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sub TEMP2
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bne @L4
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cpx TEMP
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beq @L3
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adc #$ff
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ora #$01
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@L3: rts
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@L4: bvc @L3
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eor #$ff
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ora #$01
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rts
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; ------------------------------------------------------------------------
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; Calculate all variables to plot the pixel at X1/Y1. If the point is out
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; of range, a carry is returned and INRANGE is set to a value !0 zero. If
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@ -722,3 +488,7 @@ CALC: lda xres
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tax
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lda OFFSET,x
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rts
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; ------------------------------------------------------------------------
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.include "../tgi/tgidrv_line.inc"
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8
libsrc/nes/tgi_colors.s
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8
libsrc/nes/tgi_colors.s
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@ -0,0 +1,8 @@
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;
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; Target-specific black & white values for use by the target-shared TGI kernel
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;
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.include "tgi-kernel.inc"
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.export tgi_color_black:zp = $00
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.export tgi_color_white:zp = $01
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