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112 lines
3.8 KiB
Lua
112 lines
3.8 KiB
Lua
%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 lo-res 320x240 256 color mode for now.
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; Unlike graphics module on the C64, you can use colors() to set new drawing colors for every draw operation.
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; For other resolutions or other color modes, use the "gfx2" or "monogfx" module instead. (which 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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;
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; NOTE: For sake of speed, NO BOUNDS CHECKING is performed in most routines!
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; You'll have to make sure yourself that you're not writing outside of bitmap boundaries!
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;
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graphics {
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%option ignore_unused
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romsub $feff = FB_cursor_position2() clobbers(A,X,Y) ; alias for the normal FB_cursor_position() call but reuses existing r0 and r1
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const uword WIDTH = 320
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const ubyte HEIGHT = 240
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ubyte stroke_color = 1
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ubyte background_color = 0
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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_mode($80, false)
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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_mode(0, false)
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cbm.CHROUT(147)
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}
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sub clear_screen(ubyte pixelcolor, ubyte bgcolor) {
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stroke_color = pixelcolor
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background_color = 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 colors(ubyte stroke, ubyte fill) {
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; this routine is only available on the cx16, other targets can't change colors on the fly
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cx16.GRAPH_set_colors(stroke, fill, background_color)
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stroke_color = stroke
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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 fillrect(uword xx, uword yy, uword width, uword height) {
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cx16.GRAPH_draw_rect(xx, yy, width, height, 0, true)
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}
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sub rect(uword xx, uword yy, uword width, uword height) {
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cx16.GRAPH_draw_rect(xx, yy, width, height, 0, false)
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}
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sub horizontal_line(uword xx, uword yy, uword length) {
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if length!=0
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cx16.GRAPH_draw_line(xx, yy, xx+length-1, yy)
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}
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sub vertical_line(uword xx, uword yy, uword height) {
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if height!=0
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cx16.GRAPH_draw_line(xx, yy, xx, yy+height-1)
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}
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sub circle(uword xcenter, ubyte ycenter, ubyte radius) {
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; Warning: NO BOUNDS CHECKS. Make sure circle fits in the screen.
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if radius==0
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return
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cx16.GRAPH_draw_oval(xcenter - radius, ycenter - radius, radius*2, radius*2, false)
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}
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sub disc(uword xcenter, ubyte ycenter, ubyte radius) {
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; Warning: NO BOUNDS CHECKS. Make sure circle fits in the screen.
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if radius==0
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return
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cx16.GRAPH_draw_oval(xcenter - radius, ycenter - radius, radius*2, radius*2, true)
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}
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sub oval(uword xcenter, ubyte ycenter, uword h_radius, ubyte v_radius) {
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; specific for the X16 which has a kernal routine that can draw ovals
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if h_radius==0 or v_radius==0
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return
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cx16.GRAPH_draw_oval(xcenter - h_radius, ycenter - v_radius, h_radius*2, v_radius*2, false)
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}
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sub filled_oval(uword xcenter, ubyte ycenter, uword h_radius, ubyte v_radius) {
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; specific for the X16 which has a kernal routine that can draw ovals
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if h_radius==0 or v_radius==0
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return
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cx16.GRAPH_draw_oval(xcenter - h_radius, ycenter - v_radius, h_radius*2, v_radius*2, true)
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}
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inline asmsub plot(uword plotx @R0, uword ploty @R1) clobbers(A, X, Y) {
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%asm {{
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jsr cx16.FB_cursor_position
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lda p8b_graphics.p8v_stroke_color
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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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