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cx16 virtual registers R0-R15 also available on C64 target (although in a different location in memory)

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This commit is contained in:
Irmen de Jong 2020-12-21 21:04:29 +01:00
parent dcb81e6bea
commit 950bc4b937
6 changed files with 67 additions and 27 deletions
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27
compiler/res/prog8lib/c64/syslib.p8
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@ -462,3 +462,30 @@ _raster_irq_handler
}
cx16 {
; the sixteen virtual 16-bit registers that the CX16 has defined in the zeropage
; they are simulated on the C64 as well but their location in memory is different
; (because there's no room for them in the zeropage)
; they are allocated at the bottom of the eval-stack (should be ample space unless
; you're doing insane nesting of expressions...)
&uword r0 = $cf00
&uword r1 = $cf02
&uword r2 = $cf04
&uword r3 = $cf06
&uword r4 = $cf08
&uword r5 = $cf0a
&uword r6 = $cf0c
&uword r7 = $cf0e
&uword r8 = $cf10
&uword r9 = $cf12
&uword r10 = $cf14
&uword r11 = $cf16
&uword r12 = $cf18
&uword r13 = $cf1a
&uword r14 = $cf1c
&uword r15 = $cf1e
}

36
compiler/res/prog8lib/cx16/graphics.p8
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@ -48,31 +48,31 @@ graphics {
while xx>=yy {
cx16.r0 = xcenter + xx
cx16.r1 = ycenter + yy
cx16.FB_cursor_position()
cx16.FB_cursor_position2()
cx16.FB_set_pixel(1)
cx16.r0 = xcenter - xx
cx16.FB_cursor_position()
cx16.FB_cursor_position2()
cx16.FB_set_pixel(1)
cx16.r0 = xcenter + xx
cx16.r1 = ycenter - yy
cx16.FB_cursor_position()
cx16.FB_cursor_position2()
cx16.FB_set_pixel(1)
cx16.r0 = xcenter - xx
cx16.FB_cursor_position()
cx16.FB_cursor_position2()
cx16.FB_set_pixel(1)
cx16.r0 = xcenter + yy
cx16.r1 = ycenter + xx
cx16.FB_cursor_position()
cx16.FB_cursor_position2()
cx16.FB_set_pixel(1)
cx16.r0 = xcenter - yy
cx16.FB_cursor_position()
cx16.FB_cursor_position2()
cx16.FB_set_pixel(1)
cx16.r0 = xcenter + yy
cx16.r1 = ycenter - xx
cx16.FB_cursor_position()
cx16.FB_cursor_position2()
cx16.FB_set_pixel(1)
cx16.r0 = xcenter - yy
cx16.FB_cursor_position()
cx16.FB_cursor_position2()
cx16.FB_set_pixel(1)
yy++
if decisionOver2<=0 {
@ -102,27 +102,19 @@ graphics {
ubyte ycenter_min_xx = ycenter - xx
uword @zp plotx
cx16.r0 = xcenter-xx
cx16.r1 = ycenter_plus_yy
cx16.FB_cursor_position()
cx16.FB_cursor_position(xcenter-xx, ycenter_plus_yy)
repeat xx*2+1
cx16.FB_set_pixel(1)
cx16.r0 = xcenter-xx
cx16.r1 = ycenter_min_yy
cx16.FB_cursor_position()
cx16.FB_cursor_position(xcenter-xx, ycenter_min_yy)
repeat xx*2+1
cx16.FB_set_pixel(1)
cx16.r0 = xcenter-yy
cx16.r1 = ycenter_plus_xx
cx16.FB_cursor_position()
cx16.FB_cursor_position(xcenter-yy, ycenter_plus_xx)
repeat yy*2+1
cx16.FB_set_pixel(1)
cx16.r0 = xcenter-yy
cx16.r1 = ycenter_min_xx
cx16.FB_cursor_position()
cx16.FB_cursor_position(xcenter-yy, ycenter_min_xx)
repeat yy*2+1
cx16.FB_set_pixel(1)
@ -137,9 +129,7 @@ graphics {
}
sub plot(uword plotx, ubyte ploty) {
cx16.r0 = plotx
cx16.r1 = ploty
cx16.FB_cursor_position()
cx16.FB_cursor_position(plotx, ploty)
cx16.FB_set_pixel(1)
}
}

1
compiler/res/prog8lib/cx16/syslib.p8
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@ -215,6 +215,7 @@ romsub $fef6 = FB_init() clobbers(A,X,Y)
romsub $fef9 = FB_get_info() clobbers(X,Y) -> byte @A, uword @R0, uword @R1 ; width=r0, height=r1
romsub $fefc = FB_set_palette(uword pointer @R0, ubyte index @A, ubyte bytecount @X) clobbers(A,X,Y)
romsub $feff = FB_cursor_position(uword x @R0, uword y @R1) clobbers(A,X,Y)
romsub $feff = FB_cursor_position2() clobbers(A,X,Y) ; alias for the previous routine, but avoiding having to respecify both x and y every time
romsub $ff02 = FB_cursor_next_line(uword x @R0) clobbers(A,X,Y)
romsub $ff05 = FB_get_pixel() clobbers(X,Y) -> ubyte @A
romsub $ff08 = FB_get_pixels(uword pointer @R0, uword count @R1) clobbers(A,X,Y)

1
compiler/src/prog8/compiler/target/c64/C64MachineDefinition.kt
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@ -24,7 +24,6 @@ internal object C64MachineDefinition: IMachineDefinition {
override val RAW_LOAD_ADDRESS = 0xc000
// the 2*256 byte evaluation stack (on which bytes, words, and even floats are stored during calculations)
// and some heavily used string constants derived from the two values above
override val ESTACK_LO = 0xce00 // $ce00-$ceff inclusive
override val ESTACK_HI = 0xcf00 // $ce00-$ceff inclusive

1
compiler/src/prog8/compiler/target/cx16/CX16MachineDefinition.kt
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@ -21,7 +21,6 @@ internal object CX16MachineDefinition: IMachineDefinition {
override val RAW_LOAD_ADDRESS = 0x8000
// the 2*256 byte evaluation stack (on which bytes, words, and even floats are stored during calculations)
// and some heavily used string constants derived from the two values above
override val ESTACK_LO = 0x0400 // $0400-$04ff inclusive
override val ESTACK_HI = 0x0500 // $0500-$05ff inclusive

28
examples/test.p8
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@ -8,9 +8,33 @@
main {
romsub $ff2c = GRAPH_draw_line(uword x1 @R0, uword y1 @R1, uword x2 @R2, uword y2 @R3) clobbers(A,X,Y) ; uses x1=r0, y1=r1, x2=r2, y2=r3
asmsub GRAPH_draw_line(uword x1 @R0, uword y1 @R1, uword x2 @R2, uword y2 @R3) clobbers(A,X,Y) {
%asm {{
lda cx16.r0
ldy cx16.r0+1
jsr txt.print_uw
lda #13
jsr c64.CHROUT
lda cx16.r1
ldy cx16.r1+1
jsr txt.print_uw
lda #13
jsr c64.CHROUT
lda cx16.r2
ldy cx16.r2+1
jsr txt.print_uw
lda #13
jsr c64.CHROUT
lda cx16.r3
ldy cx16.r3+1
jsr txt.print_uw
lda #13
jsr c64.CHROUT
rts
}}
}
sub start () {
GRAPH_draw_line(1,2,3,4)
GRAPH_draw_line(1111,2222,3333,4444) ; TODO allocate R0-R15 for the C64 as well (at the bottom of the eval stack hi at $cf00)
}
}