228 lines
3.9 KiB
NASM
228 lines
3.9 KiB
NASM
; background routines
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const BACKGROUND_FRAMEBUFFER: 0x02000000 ; pointer to background framebuffer
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; fill the whole background with a color
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; inputs:
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; r0: color
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; outputs:
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; none
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fill_background:
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push r1
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push r31
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mov r1, BACKGROUND_FRAMEBUFFER
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mov r31, 0x0004B000 ; 640*480
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fill_background_loop:
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mov [r1], r0
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add r1, 4
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loop fill_background_loop
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pop r31
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pop r1
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ret
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; draw a pixel to the background
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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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; outputs:
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; none
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draw_pixel_to_background:
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push r5
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push r6
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mov r3, BACKGROUND_FRAMEBUFFER
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mov r4, 640
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call draw_pixel_generic
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pop r6
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pop r5
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ret
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; draw a filled rectangle to the background
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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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; outputs:
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; none
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draw_filled_rectangle_to_background:
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push r5
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push r6
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mov r5, BACKGROUND_FRAMEBUFFER
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mov r6, 640
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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 the background
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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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; outputs:
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; none
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draw_tile_to_background:
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push r8
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push r9
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mov r8, BACKGROUND_FRAMEBUFFER
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mov r9, 640
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call draw_tile_generic
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pop r9
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pop r8
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ret
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; draw a single font tile to the background
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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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; outputs:
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; none
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draw_font_tile_to_background:
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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 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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mov r8, BACKGROUND_FRAMEBUFFER
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mov r9, 640
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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 the background, 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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; 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_background:
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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 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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mov r8, BACKGROUND_FRAMEBUFFER
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mov r9, 640
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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 the background
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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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; outputs:
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; r1: X coordinate of end of text
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draw_str_to_background:
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push r0
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push r5
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mov r5, r0
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draw_str_to_background_loop:
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movz.8 r0, [r5]
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call draw_font_tile_to_background
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inc r5
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add r1, 8
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cmp.8 [r5], 0x00
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ifnz jmp draw_str_to_background_loop
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pop r5
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pop r0
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ret
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; draw a decimal value to the background
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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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; outputs:
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; r1: X coordinate of end of text
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draw_decimal_to_background:
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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 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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mov r8, BACKGROUND_FRAMEBUFFER
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mov r9, 640
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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 the background
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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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; outputs:
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; r1: X coordinate of end of text
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draw_hex_to_background:
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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 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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mov r8, BACKGROUND_FRAMEBUFFER
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mov r9, 640
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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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