133 lines
3.2 KiB
Plaintext
133 lines
3.2 KiB
Plaintext
( draw routines )
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:dev/r fff8 ( std read port )
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:dev/w fff9 ( std write port )
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;x_ 2 ;y_ 2 ;x 2 ;y 2 ;w 2 ;h 2 ;color 1
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;x0 2 ;y0 2 ;x1 2 ;y1 2 ;dx 2 ;dy 2 ;err1 2 ;err2 2 ( line )
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|0100 @RESET
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( set dev/write to screen )
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,01 ,dev/w STR
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,01 ,color STR
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( fill rect x y w h )
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,0020 ,0020 ,0060 ,0040 ,fillrect JSR
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,02 ,color STR
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( fill rect x y w h )
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,0030 ,0030 ,0040 ,0060 ,fillrect JSR
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,03 ,color STR
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( fill rect x y w h )
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,0040 ,0040 ,0060 ,0040 ,fillrect JSR
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,01 ,color STR
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( fill rect x y w h )
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,00a0 ,0010 ,0020 ,0020 ,fillrect JSR
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,02 ,color STR
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( fill rect x y w h )
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,00b0 ,0040 ,0020 ,0020 ,linerect JSR
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,03 ,color STR
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( fill rect x y w h )
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,0058 ,0028 ,0050 ,0050 ,linerect JSR
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,01 ,color STR
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( fill rect x y w h )
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,0028 ,0038 ,0050 ,0030 ,linerect JSR
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( positive )
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,01 ,color STR
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+0030 ,x0 STR^ +0040 ,y0 STR^
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+0100 ,x1 STR^ +0060 ,y1 STR^
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,line JSR
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,02 ,color STR
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+0020 ,x0 STR^ +0010 ,y0 STR^
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+0090 ,x1 STR^ +0070 ,y1 STR^
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,line JSR
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,03 ,color STR
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+0010 ,x0 STR^ +0040 ,y0 STR^
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+0070 ,x1 STR^ +0060 ,y1 STR^
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,line JSR
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,redraw JSR
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BRK
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@fillrect
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,h STR^ ,w STR^ ,y STR^ ,x STR^
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,x LDR^ ,x_ STR^ ,y LDR^ ,y_ STR^
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@fillrectrow
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,x LDR^ ,x_ STR^
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@fillrectcol
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( draw ) ,x_ LDR^ ,y_ LDR^ ,putpixel JSR
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,x_ LDR^ ,0001 ADD^ ,x_ STR^
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,x_ LDR^ ,w LDR^ ,x LDR^ ADD^ LTH^ ,fillrectcol ROT JMP? POP^
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,y_ LDR^ ,0001 ADD^ ,y_ STR^
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,y_ LDR^ ,h LDR^ ,y LDR^ ADD^ LTH^ ,fillrectrow ROT JMP? POP^
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RTS
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@linerect
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,h STR^ ,w STR^ ,y STR^ ,x STR^
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,x LDR^ ,x_ STR^ ,y LDR^ ,y_ STR^
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@linerectcol
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( draw ) ,x LDR^ ,y_ LDR^ ,putpixel JSR
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( draw ) ,x LDR^ ,w LDR^ ADD^ ,y_ LDR^ ,putpixel JSR
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,y_ LDR^ ,0001 ADD^ ,y_ STR^
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,y_ LDR^ ,h LDR^ ,y LDR^ ADD^ LTH^ ,linerectcol ROT JMP? POP^
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@linerectrow
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( draw ) ,x_ LDR^ ,y LDR^ ,putpixel JSR
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( draw ) ,x_ LDR^ ,y LDR^ ,h LDR^ ADD^ ,putpixel JSR
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,x_ LDR^ ,0001 ADD^ ,x_ STR^
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,x_ LDR^ ,w LDR^ ,x LDR^ ADD^ ,0001 ADD^ LTH^ ,linerectrow ROT JMP? POP^
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RTS
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@line
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,x0 LDR^ ,x_ STR^ ,y0 LDR^ ,y_ STR^ ( start at x0,y0 )
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,x1 LDR^ ,x0 LDR^ ,diff16sub JSR ,dx STR^ ( int dx = abs[x1 - x0] )
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,y1 LDR^ ,y0 LDR^ ,diff16sub JSR -0001 MUL!^ ,dy STR^ ( int dy = -abs[y1 - y0] )
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,dx LDR^ ,dy LDR^ ADD!^ ,err1 STR^ ( int err1 = dx + dy, e2; )
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@lineloop
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,x_ LDR^ ,y_ LDR^ ,putpixel JSR ( draw )
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@line-x
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,err1 LDR^ +0002 MUL!^ ,err2 STR^ ( e2 = 2 * err; )
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,err2 LDR^ ,dy LDR^ LTH!^ ,line-y ROT JMP? POP^ ( e2 >= dy )
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,err1 LDR^ ,dy LDR^ ADD!^ ,err1 STR^ ( err1 += dy; )
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,x_ LDR^ +0001 ADD!^ ,x_ STR^ ( y0 += y0 < y1 ? 1 : -1; )
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@line-y
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,err2 LDR^ ,dx LDR^ GTH!^ ,line-end ROT JMP? POP^ ( e2 <= dx )
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,err1 LDR^ ,dx LDR^ ADD!^ ,err1 STR^ ( err1 += dx; )
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,y_ LDR^ +0001 ADD!^ ,y_ STR^ ( y0 += y0 < y1 ? 1 : -1; )
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@line-end
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,x_ LDR^ ,x1 LDR^ NEQ!^ ,lineloop ROT JMP? POP^ ( loop )
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RTS
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@diff16
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OVR^ OVR^ GTH^ ,diff16sub ROT JMP? POP^
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SWP^ @diff16sub SUB^
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RTS
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@redraw
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,0000 IOW^
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,0000 IOW^
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,00 IOW
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,01 IOW
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RTS
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@putpixel
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IOW^ ( y short )
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IOW^ ( x short )
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,color LDR IOW ( color byte )
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,00 IOW ( redraw byte )
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RTS
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|c000 @FRAME BRK
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|d000 @ERROR BRK
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|FFFA .RESET .FRAME .ERROR
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