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tweak mandelbrots and c64 graphics plot() doesnt work with XY parameter

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This commit is contained in:
Irmen de Jong 2020-08-31 00:36:40 +02:00
parent 364ef3e55c
commit 5eae7a2b93
3 changed files with 60 additions and 50 deletions
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98
compiler/res/prog8lib/c64graphics.p8
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@ -38,15 +38,15 @@ graphics {
} }
dx *= 2 dx *= 2
dy *= 2 dy *= 2
plotx = x1 internal_plotx = x1
if dx >= dy { if dx >= dy {
if positive_ix { if positive_ix {
repeat { repeat {
plot(y1) internal_plot(y1)
if plotx==x2 if internal_plotx==x2
return return
plotx++ internal_plotx++
d += dy d += dy
if d > dx { if d > dx {
y1++ y1++
@ -55,10 +55,10 @@ graphics {
} }
} else { } else {
repeat { repeat {
plot(y1) internal_plot(y1)
if plotx==x2 if internal_plotx==x2
return return
plotx-- internal_plotx--
d += dy d += dy
if d > dx { if d > dx {
y1++ y1++
@ -70,25 +70,25 @@ graphics {
else { else {
if positive_ix { if positive_ix {
repeat { repeat {
plot(y1) internal_plot(y1)
if y1 == y2 if y1 == y2
return return
y1++ y1++
d += dx d += dx
if d > dy { if d > dy {
plotx++ internal_plotx++
d -= dy d -= dy
} }
} }
} else { } else {
repeat { repeat {
plot(y1) internal_plot(y1)
if y1 == y2 if y1 == y2
return return
y1++ y1++
d += dx d += dx
if d > dy { if d > dy {
plotx-- internal_plotx--
d -= dy d -= dy
} }
} }
@ -104,26 +104,26 @@ graphics {
byte @zp decisionOver2 = 1-xx as byte byte @zp decisionOver2 = 1-xx as byte
while xx>=yy { while xx>=yy {
plotx = xcenter + xx internal_plotx = xcenter + xx
ploty = ycenter + yy ploty = ycenter + yy
plot(ploty) internal_plot(ploty)
plotx = xcenter - xx internal_plotx = xcenter - xx
plot(ploty) internal_plot(ploty)
plotx = xcenter + xx internal_plotx = xcenter + xx
ploty = ycenter - yy ploty = ycenter - yy
plot(ploty) internal_plot(ploty)
plotx = xcenter - xx internal_plotx = xcenter - xx
plot(ploty) internal_plot(ploty)
plotx = xcenter + yy internal_plotx = xcenter + yy
ploty = ycenter + xx ploty = ycenter + xx
plot(ploty) internal_plot(ploty)
plotx = xcenter - yy internal_plotx = xcenter - yy
plot(ploty) internal_plot(ploty)
plotx = xcenter + yy internal_plotx = xcenter + yy
ploty = ycenter - xx ploty = ycenter - xx
plot(ploty) internal_plot(ploty)
plotx = xcenter - yy internal_plotx = xcenter - yy
plot(ploty) internal_plot(ploty)
yy++ yy++
if decisionOver2<=0 if decisionOver2<=0
decisionOver2 += 2*yy+1 decisionOver2 += 2*yy+1
@ -146,21 +146,21 @@ graphics {
ubyte cy_plus_xx = cy + xx ubyte cy_plus_xx = cy + xx
ubyte cy_min_xx = cy - xx ubyte cy_min_xx = cy - xx
for plotx in cx to cx+xx { for internal_plotx in cx to cx+xx {
plot(cy_plus_yy) internal_plot(cy_plus_yy)
plot(cy_min_yy) internal_plot(cy_min_yy)
} }
for plotx in cx-xx to cx-1 { for internal_plotx in cx-xx to cx-1 {
plot(cy_plus_yy) internal_plot(cy_plus_yy)
plot(cy_min_yy) internal_plot(cy_min_yy)
} }
for plotx in cx to cx+yy { for internal_plotx in cx to cx+yy {
plot(cy_plus_xx) internal_plot(cy_plus_xx)
plot(cy_min_xx) internal_plot(cy_min_xx)
} }
for plotx in cx-yy to cx { for internal_plotx in cx-yy to cx {
plot(cy_plus_xx) internal_plot(cy_plus_xx)
plot(cy_min_xx) internal_plot(cy_min_xx)
} }
yy++ yy++
if decisionOver2<=0 if decisionOver2<=0
@ -180,17 +180,27 @@ graphics {
; @(addr) |= ormask[lsb(px) & 7] ; @(addr) |= ormask[lsb(px) & 7]
; } ; }
uword plotx ; 0..319 ; separate 'parameter' for plot() ; TODO fix the use of X (or XY) as parameter so we can actually use this plot() routine
; calling it with a byte results in a compiler crash, calling it with word results in clobbering X register I think
asmsub plotXXX(uword plotx @XY, ubyte ploty @A) {
%asm {{
stx internal_plotx
sty internal_plotx+1
jmp internal_plot
}}
}
asmsub plot(ubyte ploty @A) { ; plotx is 16 bits 0 to 319... doesn't fit in a register uword internal_plotx ; 0..319 ; separate 'parameter' for internal_plot()
asmsub internal_plot(ubyte ploty @A) { ; internal_plotx is 16 bits 0 to 319... doesn't fit in a register
%asm {{ %asm {{
tay tay
stx P8ZP_SCRATCH_REG_X stx P8ZP_SCRATCH_REG_X
lda plotx+1 lda internal_plotx+1
sta P8ZP_SCRATCH_W2+1 sta P8ZP_SCRATCH_W2+1
lsr a ; 0 lsr a ; 0
sta P8ZP_SCRATCH_W2 sta P8ZP_SCRATCH_W2
lda plotx lda internal_plotx
pha pha
and #7 and #7
tax tax
@ -203,7 +213,7 @@ graphics {
adc P8ZP_SCRATCH_W2+1 adc P8ZP_SCRATCH_W2+1
sta P8ZP_SCRATCH_W2+1 sta P8ZP_SCRATCH_W2+1
pla ; plotx pla ; internal_plotx
and #%11111000 and #%11111000
tay tay
lda (P8ZP_SCRATCH_W2),y lda (P8ZP_SCRATCH_W2),y

4
examples/cx16/mandelbrot-gfx.p8
View File

@ -26,14 +26,14 @@ main {
ubyte pixely ubyte pixely
for pixely in 0 to height-1 { for pixely in 0 to height-1 {
float yy = YL+dy*pixely float yy = YL+dy*(pixely as float)
cx16.r0 = 0 cx16.r0 = 0
cx16.r1 = pixely cx16.r1 = pixely
cx16.FB_cursor_position() cx16.FB_cursor_position()
for pixelx in 0 to width-1 { for pixelx in 0 to width-1 {
float xx = XL+dx*pixelx float xx = XL+dx*(pixelx as float)
float xsquared = 0.0 float xsquared = 0.0
float ysquared = 0.0 float ysquared = 0.0

8
examples/mandelbrot-gfx.p8
View File

@ -37,10 +37,10 @@ main {
iter++ iter++
} }
if iter & 1 { if iter & 1
graphics.plotx = pixelx ; TODO fix plot() so we don't have to use separate internal variable
graphics.plot(pixely) graphics.internal_plotx = pixelx
} graphics.internal_plot(pixely)
} }
} }