fixed math.mul_word_40 that was actually doing *80...

This commit is contained in:
Irmen de Jong 2020-12-23 00:54:11 +01:00
parent 118aed2e31
commit d65cfbf093
4 changed files with 238 additions and 19 deletions

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@ -165,22 +165,22 @@ cx16 {
&ubyte d1ora = via1+15
const uword via2 = $9f70 ;VIA 6522 #2
&ubyte d2prb =via2+0
&ubyte d2pra =via2+1
&ubyte d2ddrb =via2+2
&ubyte d2ddra =via2+3
&ubyte d2t1l =via2+4
&ubyte d2t1h =via2+5
&ubyte d2t1ll =via2+6
&ubyte d2t1lh =via2+7
&ubyte d2t2l =via2+8
&ubyte d2t2h =via2+9
&ubyte d2sr =via2+10
&ubyte d2acr =via2+11
&ubyte d2pcr =via2+12
&ubyte d2ifr =via2+13
&ubyte d2ier =via2+14
&ubyte d2ora =via2+15
&ubyte d2prb = via2+0
&ubyte d2pra = via2+1
&ubyte d2ddrb = via2+2
&ubyte d2ddra = via2+3
&ubyte d2t1l = via2+4
&ubyte d2t1h = via2+5
&ubyte d2t1ll = via2+6
&ubyte d2t1lh = via2+7
&ubyte d2t2l = via2+8
&ubyte d2t2h = via2+9
&ubyte d2sr = via2+10
&ubyte d2acr = via2+11
&ubyte d2pcr = via2+12
&ubyte d2ifr = via2+13
&ubyte d2ier = via2+14
&ubyte d2ora = via2+15
; ---- Commander X-16 additions on top of C64 kernal routines ----

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@ -1203,8 +1203,6 @@ mul_word_40 .proc
rol a
asl P8ZP_SCRATCH_W1
rol a
asl P8ZP_SCRATCH_W1
rol a
tay
lda P8ZP_SCRATCH_W1
rts

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@ -2,6 +2,7 @@
TODO
====
- optimize (byte) bitshifting 1<<x (and 2**x) via lookup table 1,2,4,8,...
- Cx16 target: support full-screen 640x480 and 320x240 graphics? That requires our own custom graphics routines though to draw lines, and plot pixels.
- hoist all variable declarations up to the subroutine scope *before* even the constant folding takes place (to avoid undefined symbol errors when referring to a variable from another nested scope in the subroutine)
- make it possible to use cpu opcodes such as 'nop' as variable names by prefixing all asm vars with something such as '_'

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@ -2,13 +2,233 @@
%import diskio
%import floats
%import graphics
%zeropage basicsafe
%import test_stack
%zeropage basicsafe
%option no_sysinit
main {
; uword adres
; ubyte adreshi
sub start () {
txt.print("hello\n")
uword xx
xx = 777
%asm {{
lda xx
ldy xx+1
jsr math.mul_word_20
sta xx
sty xx+1
}}
txt.print_uw(xx)
txt.chrout('\n')
xx = 777
%asm {{
lda xx
ldy xx+1
jsr math.mul_word_40
sta xx
sty xx+1
}}
txt.print_uw(xx)
txt.chrout('\n')
xx = 777
%asm {{
lda xx
ldy xx+1
jsr math.mul_word_80
sta xx
sty xx+1
}}
txt.print_uw(xx)
txt.chrout('\n')
return
gfx2.set_mode(128)
gfx2.clear_screen()
uword offset
ubyte angle
uword x
uword y
when gfx2.active_mode {
0 -> {
for offset in 0 to 90 step 3 {
for angle in 0 to 255 {
x = $0008+sin8u(angle)/2
y = $0008+cos8u(angle)/2
gfx2.plot(x+offset*2,y+offset, lsb(x+y))
}
}
}
128 -> {
for offset in 0 to 190 step 6 {
for angle in 0 to 255 {
x = $0008+sin8u(angle)
y = $0008+cos8u(angle)
gfx2.plot(x+offset*2,y+offset, 1)
}
}
}
}
}
}
gfx2 {
ubyte active_mode = 255
uword width = 0
uword height = 0
ubyte bpp = 0
sub set_mode(ubyte mode) {
; mode 0 = bitmap 320 x 240 x 256c
; mode 128 = bitmap 640 x 480 x 1c monochrome
; ...
when mode {
0 -> {
; 320 x 240 x 256c
cx16.VERA_DC_VIDEO = (cx16.VERA_DC_VIDEO & %11001111) | %00100000 ; enable only layer 1
cx16.VERA_DC_HSCALE = 64
cx16.VERA_DC_VSCALE = 64
cx16.VERA_L1_CONFIG = %00000111
cx16.VERA_L1_MAPBASE = 0
cx16.VERA_L1_TILEBASE = 0
width = 320
height = 240
bpp = 8
}
128 -> {
; 640 x 480 x 1c
cx16.VERA_DC_VIDEO = (cx16.VERA_DC_VIDEO & %11001111) | %00100000 ; enable only layer 1
cx16.VERA_DC_HSCALE = 128
cx16.VERA_DC_VSCALE = 128
cx16.VERA_L1_CONFIG = %00000100
cx16.VERA_L1_MAPBASE = 0
cx16.VERA_L1_TILEBASE = %00000001
width = 640
height = 480
bpp = 1
}
}
active_mode = mode
}
sub clear_screen() {
when active_mode {
0 -> {
; 320 x 240 x 256c
cx16.VERA_CTRL = 0
cx16.VERA_ADDR_H = %00010000
cx16.VERA_ADDR_M = 0
cx16.VERA_ADDR_L = 0
repeat 240/4
cs_innerloop1280()
}
128 -> {
; 640 x 480 x 1c
cx16.VERA_CTRL = 0
cx16.VERA_ADDR_H = %00010000
cx16.VERA_ADDR_M = 0
cx16.VERA_ADDR_L = 0
repeat 480/16
cs_innerloop1280()
}
}
}
asmsub cs_innerloop1280() {
%asm {{
ldy #160
- stz cx16.VERA_DATA0
stz cx16.VERA_DATA0
stz cx16.VERA_DATA0
stz cx16.VERA_DATA0
stz cx16.VERA_DATA0
stz cx16.VERA_DATA0
stz cx16.VERA_DATA0
stz cx16.VERA_DATA0
dey
bne -
rts
}}
}
sub plot(uword x, uword y, ubyte color) {
uword addr
ubyte addrhi
when active_mode {
0 -> {
; TODO problem when y>=204 and x=..something... then the address gets > 64K; so we really need 24 bit address calculations...
addr = y
addr_mul_24_320()
addr_add_word_24(x)
cx16.vpoke(addrhi, addr, color)
}
128 -> {
ubyte[8] bits = [128, 64, 32, 16, 8, 4, 2, 1]
addr = 0
addr += y*(640/8)
addr += x/8
ubyte pix = cx16.vpeek(0, addr) | bits[lsb(x)&7]
cx16.vpoke(0, addr, pix)
}
}
; TODO when subs are in front of real code, they generate in place and fuck up the code. Move them to the bottom?
asmsub addr_mul_24_320() {
; addr = addr * 256 + addr * 64, bits 16-23 into addrhi
%asm {{
lda addr
sta P8ZP_SCRATCH_B1
lda addr+1
sta addrhi
sta P8ZP_SCRATCH_REG
lda addr
asl a
rol P8ZP_SCRATCH_REG
asl a
rol P8ZP_SCRATCH_REG
asl a
rol P8ZP_SCRATCH_REG
asl a
rol P8ZP_SCRATCH_REG
asl a
rol P8ZP_SCRATCH_REG
asl a
rol P8ZP_SCRATCH_REG
sta addr
lda P8ZP_SCRATCH_B1
clc
adc P8ZP_SCRATCH_REG
sta addr+1
bcc +
inc addrhi
+ rts
}}
}
asmsub addr_add_word_24(uword w @ AY) {
%asm {{
clc
adc addr
sta addr
tya
adc addr+1
sta addr+1
bcc +
inc addrhi
+ rts
}}
}
}
}