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https://github.com/irmen/prog8.git
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146 lines
4.4 KiB
Lua
146 lines
4.4 KiB
Lua
%target cx16
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%import syslib
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%import textio
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; Bitmap pixel graphics module for the CommanderX16
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; wraps the graphics functions that are in ROM.
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; only black/white monchrome 320x200 for now. (i.e. truncated at the bottom)
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; For full-screen 640x480 or 320x240 graphics, use the "gfx2" module instead. (but that is Cx16-specific)
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; Note: there is no color palette manipulation here, you have to do that yourself or use the "palette" module.
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graphics {
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const uword WIDTH = 320
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const ubyte HEIGHT = 200
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sub enable_bitmap_mode() {
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; enable bitmap screen, erase it and set colors to black/white.
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void cx16.screen_set_mode($80)
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cx16.GRAPH_init(0)
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clear_screen(1, 0)
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}
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sub disable_bitmap_mode() {
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; enables text mode, erase the text screen, color white
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void cx16.screen_set_mode(2)
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txt.fill_screen(' ', 1) ; doesn't seem to fully clear the text screen after returning from gfx mode
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}
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sub clear_screen(ubyte pixelcolor, ubyte bgcolor) {
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cx16.GRAPH_set_colors(pixelcolor, pixelcolor, bgcolor)
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cx16.GRAPH_clear()
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}
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sub line(uword @zp x1, ubyte @zp y1, uword @zp x2, ubyte @zp y2) {
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cx16.GRAPH_draw_line(x1, y1, x2, y2)
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}
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sub circle(uword xcenter, ubyte ycenter, ubyte radius) {
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;cx16.r0 = xcenter - radius/2
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;cx16.r1 = ycenter - radius/2
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;cx16.r2 = radius*2
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;cx16.r3 = radius*2
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;cx16.GRAPH_draw_oval(false) ; currently this call is not implemented on cx16, does a BRK
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; Midpoint algorithm
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if radius==0
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return
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ubyte @zp xx = radius
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ubyte @zp yy = 0
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byte @zp decisionOver2 = 1-xx as byte
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while xx>=yy {
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cx16.r0 = xcenter + xx
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cx16.r1 = ycenter + yy
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cx16.FB_cursor_position2()
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cx16.FB_set_pixel(1)
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cx16.r0 = xcenter - xx
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cx16.FB_cursor_position2()
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cx16.FB_set_pixel(1)
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cx16.r0 = xcenter + xx
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cx16.r1 = ycenter - yy
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cx16.FB_cursor_position2()
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cx16.FB_set_pixel(1)
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cx16.r0 = xcenter - xx
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cx16.FB_cursor_position2()
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cx16.FB_set_pixel(1)
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cx16.r0 = xcenter + yy
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cx16.r1 = ycenter + xx
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cx16.FB_cursor_position2()
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cx16.FB_set_pixel(1)
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cx16.r0 = xcenter - yy
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cx16.FB_cursor_position2()
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cx16.FB_set_pixel(1)
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cx16.r0 = xcenter + yy
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cx16.r1 = ycenter - xx
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cx16.FB_cursor_position2()
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cx16.FB_set_pixel(1)
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cx16.r0 = xcenter - yy
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cx16.FB_cursor_position2()
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cx16.FB_set_pixel(1)
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yy++
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if decisionOver2<=0 {
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decisionOver2 += 2*yy+1
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} else {
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xx--
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decisionOver2 += 2*(yy-xx)+1
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}
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}
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}
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sub disc(uword xcenter, ubyte ycenter, ubyte radius) {
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; cx16.r0 = xcenter - radius/2
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; cx16.r1 = ycenter - radius/2
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; cx16.r2 = radius*2
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; cx16.r3 = radius*2
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; cx16.GRAPH_draw_oval(true) ; currently this call is not implemented on cx16, does a BRK
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if radius==0
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return
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ubyte @zp xx = radius
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ubyte @zp yy = 0
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byte decisionOver2 = 1-xx as byte
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while xx>=yy {
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ubyte ycenter_plus_yy = ycenter + yy
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ubyte ycenter_min_yy = ycenter - yy
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ubyte ycenter_plus_xx = ycenter + xx
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ubyte ycenter_min_xx = ycenter - xx
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uword @zp plotx
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cx16.FB_cursor_position(xcenter-xx, ycenter_plus_yy)
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repeat xx*2+1
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cx16.FB_set_pixel(1)
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cx16.FB_cursor_position(xcenter-xx, ycenter_min_yy)
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repeat xx*2+1
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cx16.FB_set_pixel(1)
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cx16.FB_cursor_position(xcenter-yy, ycenter_plus_xx)
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repeat yy*2+1
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cx16.FB_set_pixel(1)
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cx16.FB_cursor_position(xcenter-yy, ycenter_min_xx)
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repeat yy*2+1
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cx16.FB_set_pixel(1)
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yy++
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if decisionOver2<=0
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decisionOver2 += 2*yy+1
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else {
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xx--
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decisionOver2 += 2*(yy-xx)+1
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}
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}
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}
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inline asmsub plot(uword plotx @R0, uword ploty @R1) {
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%asm {{
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jsr cx16.FB_cursor_position
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lda #1
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jsr cx16.FB_set_pixel
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}}
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}
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}
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