537 lines
12 KiB
NASM
537 lines
12 KiB
NASM
; overlay routines
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; enable an overlay
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; inputs:
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; r0: overlay number
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; outputs:
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; none
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enable_overlay:
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push r0
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or r0, 0x80000300
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out r0, 1
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pop r0
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ret
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; disable an overlay
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; inputs:
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; r0: overlay number
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; outputs:
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; none
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disable_overlay:
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push r0
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or r0, 0x80000300
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out r0, 0
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pop r0
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ret
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; move an overlay
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; r0: X position
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; r1: Y position
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; r2: overlay number
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move_overlay:
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push r1
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push r2
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or r2, 0x80000000
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sla r1, 16
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mov.16 r1, r0
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out r2, r1
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pop r2
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pop r1
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ret
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; resize an overlay
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; r0: width
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; r1: height
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; r2: overlay number
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resize_overlay:
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push r1
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push r2
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or r2, 0x80000100
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sla r1, 16
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mov.16 r1, r0
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out r2, r1
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pop r2
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pop r1
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ret
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; set an overlay's framebuffer pointer
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; r0: framebuffer pointer
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; r1: overlay number
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set_overlay_framebuffer_pointer:
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push r1
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or r1, 0x80000200
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out r1, r0
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pop r1
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ret
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; fill a whole overlay with a color
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; inputs:
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; r0: color
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; r1: overlay number
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; outputs:
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; none
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fill_overlay:
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push r1
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push r2
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push r3
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push r31
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mov r2, r1
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or r2, 0x80000100 ; bitwise or the overlay number with the command to get the overlay size
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or r1, 0x80000200 ; bitwise or the overlay number with the command to get the framebuffer pointer
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in r1, r1 ; r1: overlay framebuffer pointer
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in r2, r2
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mov r3, r2
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and r2, 0x0000FFFF ; r2: X size
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sra r3, 16 ; r3: Y size
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mul r2, r3
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mov r31, r2
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fill_overlay_loop:
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mov [r1], r0
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add r1, 4
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loop fill_overlay_loop
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pop r31
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pop r3
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pop r2
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pop r1
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ret
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; draw a pixel to an overlay
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; inputs:
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; r0: X coordinate
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; r1: Y coordinate
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; r2: color
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; r3: overlay number
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; outputs:
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; none
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draw_pixel_to_overlay:
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push r3
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push r4
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mov r4, r3
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or r4, 0x80000100 ; bitwise or the overlay number with the command to get the overlay size
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or r3, 0x80000200 ; bitwise or the overlay number with the command to get the framebuffer pointer
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in r3, r3 ; r3: overlay framebuffer pointer
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in r4, r4
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and r4, 0x0000FFFF ; r4: overlay width
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call draw_pixel_generic
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pop r4
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pop r3
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ret
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; draw a filled rectangle to an overlay
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; inputs:
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; r0: X coordinate of top-left
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; r1: Y coordinate of top-left
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; r2: X size
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; r3: Y size
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; r4: color
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; r5: overlay number
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; outputs:
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; none
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draw_filled_rectangle_to_overlay:
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push r5
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push r6
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mov r6, r5
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or r6, 0x80000100 ; bitwise or the overlay number with the command to get the overlay size
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or r5, 0x80000200 ; bitwise or the overlay number with the command to get the framebuffer pointer
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in r5, r5 ; r5: overlay framebuffer pointer
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in r6, r6
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and r6, 0x0000FFFF ; r6: overlay width
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call draw_filled_rectangle_generic
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pop r6
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pop r5
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ret
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; draw a single tile to an overlay
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; inputs:
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; r0: tile number
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; r1: X coordinate
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; r2: Y coordinate
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; r3: overlay number
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; outputs:
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; none
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draw_tile_to_overlay:
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push r3
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push r4
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push r8
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push r9
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mov r4, r3
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or r4, 0x80000100 ; bitwise or the overlay number with the command to get the overlay size
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or r3, 0x80000200 ; bitwise or the overlay number with the command to get the framebuffer pointer
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in r8, r3 ; r8: overlay framebuffer pointer
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in r9, r4
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and r9, 0x0000FFFF ; r9: overlay width
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call draw_tile_generic
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pop r9
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pop r8
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pop r4
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pop r3
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ret
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; draw a single font tile to an overlay
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; inputs:
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; r0: tile number
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; r1: X coordinate
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; r2: Y coordinate
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; r3: foreground color
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; r4: background color
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; r5: overlay number
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; outputs:
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; none
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draw_font_tile_to_overlay:
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push r5
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push r6
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push r7
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push r8
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push r9
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mov r6, r5
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or r6, 0x80000100 ; bitwise or the overlay number with the command to get the overlay size
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or r5, 0x80000200 ; bitwise or the overlay number with the command to get the framebuffer pointer
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in r8, r5 ; r8: overlay framebuffer pointer
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in r9, r6
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and r9, 0x0000FFFF ; r9: overlay width
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mov r5, standard_font_data
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movz.16 r6, [standard_font_width]
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movz.16 r7, [standard_font_height]
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call draw_font_tile_generic
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pop r9
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pop r8
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pop r7
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pop r6
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pop r5
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ret
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; draw text to an overlay, using printf-style formatting
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; inputs:
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; r0: pointer to null-terminated string
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; r1: X coordinate
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; r2: Y coordinate
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; r3: foreground color
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; r4: background color
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; r5: overlay number
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; r10-r15: optional format values
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; outputs:
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; r1: X coordinate of end of text
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draw_format_str_to_overlay:
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push r5
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push r6
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push r7
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push r8
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push r9
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mov r6, r5
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or r6, 0x80000100 ; bitwise or the overlay number with the command to get the overlay size
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or r5, 0x80000200 ; bitwise or the overlay number with the command to get the framebuffer pointer
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in r8, r5 ; r8: overlay framebuffer pointer
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in r9, r6
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and r9, 0x0000FFFF ; r9: overlay width
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mov r5, standard_font_data
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movz.16 r6, [standard_font_width]
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movz.16 r7, [standard_font_height]
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call draw_format_str_generic
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pop r9
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pop r8
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pop r7
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pop r6
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pop r5
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ret
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; draw text to an overlay
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; inputs:
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; r0: pointer to null-terminated string
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; r1: X coordinate
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; r2: Y coordinate
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; r3: foreground color
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; r4: background color
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; r5: overlay number
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; outputs:
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; r1: X coordinate of end of text
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draw_str_to_overlay:
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push r0
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push r6
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mov r6, r0
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draw_str_to_overlay_loop:
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movz.8 r0, [r6]
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call draw_font_tile_to_overlay
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inc r6
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add r1, 8
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cmp.8 [r6], 0x00
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ifnz jmp draw_str_to_overlay_loop
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pop r6
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pop r0
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ret
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; draw a decimal value to an overlay
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; inputs:
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; r0: value
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; r1: X coordinate
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; r2: Y coordinate
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; r3: foreground color
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; r4: background color
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; r5: overlay number
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; outputs:
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; r1: X coordinate of end of text
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draw_decimal_to_overlay:
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push r5
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push r6
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push r7
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push r8
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push r9
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mov r6, r5
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or r6, 0x80000100 ; bitwise or the overlay number with the command to get the overlay size
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or r5, 0x80000200 ; bitwise or the overlay number with the command to get the framebuffer pointer
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in r8, r5 ; r8: overlay framebuffer pointer
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in r9, r6
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and r9, 0x0000FFFF ; r9: overlay width
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mov r5, standard_font_data
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movz.16 r6, [standard_font_width]
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movz.16 r7, [standard_font_height]
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call draw_decimal_generic
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pop r9
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pop r8
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pop r7
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pop r6
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pop r5
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ret
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; draw a hex value to an overlay
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; inputs:
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; r0: value
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; r1: X coordinate
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; r2: Y coordinate
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; r3: foreground color
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; r4: background color
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; r5: overlay number
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; outputs:
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; r1: X coordinate of end of text
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draw_hex_to_overlay:
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push r5
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push r6
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push r7
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push r8
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push r9
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mov r6, r5
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or r6, 0x80000100 ; bitwise or the overlay number with the command to get the overlay size
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or r5, 0x80000200 ; bitwise or the overlay number with the command to get the framebuffer pointer
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in r8, r5 ; r8: overlay framebuffer pointer
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in r9, r6
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and r9, 0x0000FFFF ; r9: overlay width
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mov r5, standard_font_data
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movz.16 r6, [standard_font_width]
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movz.16 r7, [standard_font_height]
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call draw_hex_generic
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pop r9
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pop r8
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pop r7
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pop r6
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pop r5
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ret
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; checks if the specified overlay is covering the specified position on screen
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; the overlay can be enabled or disabled
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; example:
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; overlay 0 is at (0,0) and is 32x32 in size
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; point (4,2) is covered by overlay 0
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; point (16,16) is covered by overlay 0
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; point (31,31) is covered by overlay 0
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; point (32,32) is NOT covered by overlay 0, because it is outside of the overlay's area
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; this works for overlays of any size, at any position on screen
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; inputs:
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; r0: X coordinate
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; r1: Y coordinate
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; r2: overlay number
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; outputs:
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; Z flag: set if covering, clear if not covering
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check_if_overlay_covers_position:
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push r0
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push r1
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push r3
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push r4
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push r5
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push r6
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push r7
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mov r3, r2
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or r3, 0x80000000 ; bitwise or the overlay number with the command to get the overlay position
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in r4, r3
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mov r5, r4
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and r4, 0x0000FFFF ; r4: X position
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sra r5, 16 ; r5: Y position
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mov r3, r2
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or r3, 0x80000100 ; bitwise or the overlay number with the command to get the overlay size
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in r6, r3
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mov r7, r6
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and r6, 0x0000FFFF ; r6: width
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sra r7, 16 ; r7: height
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add r6, r4
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add r7, r5
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; (r4,r5): coordinates of top-left of the overlay
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; (r6,r7): coordinates of bottom-right of the overlay
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; now we need to check if:
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; - (r4,r5) is greater than or equal to (r0,r1)
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; and
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; - (r6,r7) is less than or equal to (r0,r1)
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; if carry flag is set, value is less than
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; if carry flag is clear, value is greater than or equal to
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cmp r0, r4
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ifc jmp check_if_overlay_covers_position_fail
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cmp r0, r6
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ifnc jmp check_if_overlay_covers_position_fail
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cmp r1, r5
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ifc jmp check_if_overlay_covers_position_fail
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cmp r1, r7
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ifnc jmp check_if_overlay_covers_position_fail
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; if we reached this point then the point is within the bounds of the overlay !!!
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mov.8 r0, 0
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cmp.8 r0, 0 ; set Z flag
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pop r7
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pop r6
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pop r5
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pop r4
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pop r3
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pop r1
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pop r0
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ret
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check_if_overlay_covers_position_fail:
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mov.8 r0, 1
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cmp.8 r0, 0 ; clear Z flag
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pop r7
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pop r6
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pop r5
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pop r4
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pop r3
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pop r1
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pop r0
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ret
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; checks if the specified overlay is covering the specified position on screen
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; the overlay must be enabled
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; example:
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; overlay 0 is at (0,0) and is 32x32 in size
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; point (4,2) is covered by overlay 0
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; point (16,16) is covered by overlay 0
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; point (31,31) is covered by overlay 0
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; point (32,32) is NOT covered by overlay 0, because it is outside of the overlay's area
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; this works for overlays of any size, at any position on screen
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; inputs:
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; r0: X coordinate
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; r1: Y coordinate
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; r2: overlay number
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; outputs:
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; Z flag: set if covering, clear if not covering
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check_if_enabled_overlay_covers_position:
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push r3
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push r4
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mov r3, r2
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or r3, 0x80000300 ; bitwise or the overlay number with the command to get the overlay enable status
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in r4, r3
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cmp r4, 0
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pop r4
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pop r3
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ifnz jmp check_if_enabled_overlay_covers_position_is_enabled
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cmp r4, 1 ; r4 is known to be zero at this point, so compare it with 1 to clear the Z flag
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ret
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check_if_enabled_overlay_covers_position_is_enabled:
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call check_if_overlay_covers_position
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ret
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; converts coordinates to be relative to the position of the specified overlay
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; the overlay can be enabled or disabled
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; example:
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; overlay is at (16,16)
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; (20,20) is specified
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; (4,4) will be returned
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; inputs:
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; r0: X coordinate
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; r1: Y coordinate
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; r2: overlay number
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; outputs:
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; r0: relative X coordinate
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; r1: relative Y coordinate
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make_coordinates_relative_to_overlay:
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push r2
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push r3
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or r2, 0x80000000 ; bitwise or the overlay number with the command to get the overlay position
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in r2, r2
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mov r3, r2
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and r2, 0x0000FFFF ; r2: overlay X position
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sra r3, 16 ; r3: overlay Y position
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sub r0, r2
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sub r1, r3
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pop r3
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pop r2
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ret
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; find the first disabled overlay, starting from 0
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; inputs:
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; none
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; outputs:
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; r0: overlay number, or 0xFF if all overlays are enabled
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get_unused_overlay:
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push r1
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push r31
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mov r0, 0x80000300
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mov r31, 31
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get_unused_overlay_loop:
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in r1, r0
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cmp r1, 0
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ifz jmp get_unused_overlay_found
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inc r0
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loop get_unused_overlay_loop
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mov r0, 0xFF
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pop r31
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pop r1
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ret
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get_unused_overlay_found:
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and r0, 0x000000FF
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pop r31
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pop r1
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ret
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