357 lines
9.9 KiB
NASM
357 lines
9.9 KiB
NASM
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; overlay routines
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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, 0x02000100 ; bitwise or the overlay number with the command to get the overlay size
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or r1, 0x02000200 ; bitwise or the overlay number with the command to get the framebuffer pointer
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in r1, r1 ; r1: overlay framebuffer poiner
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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 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 r0
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push r1
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push r2
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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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; calculate pointer to the framebuffer
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mov r6, r5 ; r6: overlay number
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or r6, 0x02000100 ; bitwise or the overlay number with the command to get the overlay size
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in r7, r6
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and r7, 0x0000FFFF ; mask off the height, we only need the width
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mul r7, 4 ; r7: overlay width in bytes (width * 4)
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mul r1, r7 ; y * width * 4
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mul r0, 4 ; x * 4
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add r0, r1 ; y * width * 4 + (x * 4)
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or r5, 0x02000200 ; bitwise or the overlay number with the command to get the framebuffer pointer
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in r5, r5
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add r0, r5 ; r0: pointer to framebuffer
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mov r6, r2
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mul r6, 4 ; multiply the X size by 4, since 4 bytes per pixel
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draw_filled_rectangle_to_overlay_y_loop:
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mov r5, r2 ; x counter
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draw_filled_rectangle_to_overlay_x_loop:
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mov [r0], r4
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add r0, 4 ; increment framebuffer pointer
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dec r5
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ifnz jmp draw_filled_rectangle_to_overlay_x_loop ; loop if there are still more X pixels to draw
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sub r0, r6 ; return to the beginning of this line
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add r0, r7 ; increment to the next line
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dec r3
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ifnz jmp draw_filled_rectangle_to_overlay_y_loop ; loop if there are still more Y pixels to draw
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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 r2
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pop r1
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pop r0
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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 r0
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push r1
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push r2
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push r5
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push r6
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push r7
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;movz.8 r0, r0 ; ensure the tile number is a single byte
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; calculate pointer to the tile data
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push r1
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push r2
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mov r1, 8 ; tile width
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mov r2, 16 ; tile height
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mul r1, r2
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mul r0, r1
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mul r0, 4 ; 4 bytes per pixel
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add r0, font ; r0: pointer to tile data
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pop r2
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pop r1
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; calculate pointer to the framebuffer
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mov r7, r5 ; r7: overlay number
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or r7, 0x02000100 ; bitwise or the overlay number with the command to get the overlay size
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in r6, r7
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and r6, 0x0000FFFF ; mask off the height, we only need the width
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mul r6, 4 ; 4 bytes per pixel
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mov r7, r6 ; r7: overlay width in bytes (width * 4)
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mul r2, r7 ; y * width * 4
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mul r1, 4 ; x * 4
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add r1, r2 ; y * width * 4 + (x * 4)
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or r5, 0x02000200 ; bitwise or the overlay number with the command to get the framebuffer pointer
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in r6, r5
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add r1, r6 ; r1: pointer to framebuffer
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mov r6, 16 ; y counter
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draw_font_tile_to_overlay_y_loop:
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mov r5, 8 ; x counter
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draw_font_tile_to_overlay_x_loop:
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mov r2, [r0]
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cmp r2, 0xFF000000
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ifz jmp draw_font_tile_to_overlay_x_loop_background
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; drawing foreground pixel
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cmp r3, 0x00000000 ; is the foreground color supposed to be transparent?
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ifz jmp draw_font_tile_to_overlay_x_loop_end
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mov [r1], r3 ; draw foreground color
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jmp draw_font_tile_to_overlay_x_loop_end
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draw_font_tile_to_overlay_x_loop_background:
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; drawing background pixel
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cmp r4, 0x00000000 ; is the background color supposed to be transparent?
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ifz jmp draw_font_tile_to_background_x_loop_end
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mov [r1], r4 ; draw background color
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draw_font_tile_to_overlay_x_loop_end:
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add r0, 4 ; increment tile pointer
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add r1, 4 ; increment framebuffer pointer
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dec r5
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ifnz jmp draw_font_tile_to_overlay_x_loop ; loop if there are still more X pixels to draw
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sub r1, 32 ; 8*4, return to the beginning of this line
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add r1, r7 ; increment to the next line by adding the overlay width in bytes
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dec r6
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ifnz jmp draw_font_tile_to_overlay_y_loop ; loop if there are still more Y pixels to draw
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pop r7
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pop r6
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pop r5
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pop r2
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pop r1
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pop r0
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ret
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; draw text on 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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; finds the overlay with the highest priority covering the specified position
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; does not check overlay 31, which is always the mouse pointer
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; inputs:
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; r0: X coordinate
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; r1: Y coordinate
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; outputs:
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; r0: overlay number
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find_overlay_covering_position:
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; TODO:
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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, 0x02000000 ; 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, 0x02000100 ; 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, 0x02000300 ; 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, 0x02000000 ; 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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