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57 lines
1.5 KiB
Lua
57 lines
1.5 KiB
Lua
%target cx16
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%import syslib
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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.
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graphics {
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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.r0 = 0
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cx16.GRAPH_init()
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clear_screen(1, 0)
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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.r0 = x1
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cx16.r1 = y1
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cx16.r2 = x2
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cx16.r3 = y2
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cx16.GRAPH_draw_line()
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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) ; TODO currently is not implemented on cx16, does a BRK
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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) ; TODO currently is not implemented on cx16, does a BRK
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}
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sub plot(uword plotx, ubyte ploty) {
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cx16.r0 = plotx
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cx16.r1 = ploty
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cx16.FB_cursor_position()
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cx16.FB_cursor_position()
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cx16.FB_set_pixel(1)
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}
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}
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