201 lines
4.9 KiB
NASM
201 lines
4.9 KiB
NASM
label draw_char_pixels:
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shift 5 2 1; Shift 5 by count in R(2)
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loadi 6 1;
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and 1 6 1; Mask with 0x01
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loadi 6 $FFFFFF
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mul 1 6 1;
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tx $C $2
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loadi $2 0
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jeq +2
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rstore 1 $B; Transfer RAX to the Address Stored in R11
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tx $2 $C
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inc $B; Increment VBuf Pointer
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inc 2; INC Scratch Pixel
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loadi 1 8; For Every Pixel in this Row of 8
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jneq draw_char_pixels
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ret
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label draw_char:
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rload 4 3; Load Arg 1 in 3
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loadi 6 $18;
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shift 3 6 5; Shift To First Byte
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loadi 2 0; Set Pixel to 8
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call draw_char_pixels
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loadi 6 $278
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add $6 $B $B ; Move VBUF
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loadi 6 $10;
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shift 3 6 5; Shift To Second Byte
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loadi 6 $0000FF;
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and 6 5 5; Mask Off
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loadi 2 0; Set Pixel to 8
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call draw_char_pixels
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loadi 6 $278
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add $6 $B $B ; Move VBUF
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loadi 6 $8;
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shift 3 6 5; Shift To Third Byte
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loadi 6 $0000FF;
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and 6 5 5;
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loadi 2 0; Set Pixel to 8
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call draw_char_pixels
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loadi 6 $278
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add $6 $B $B ; Move VBUF
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loadi 6 $0;
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shift 3 6 5; Shift To 4th Byte
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loadi 6 $0000FF;
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and 6 5 5; MASK off last Byte
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loadi 2 0; Set Pixel to 8
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call draw_char_pixels
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loadi 6 $278
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add $6 $B $B ; Move VBUF
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inc 4; Move to Second Part
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rload 4 3; Load Arg 1 in 3
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loadi 6 $18;
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shift 3 6 5; Shift To First Byte
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loadi 2 0; Set Pixel to 8
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call draw_char_pixels
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loadi 6 $278
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add $6 $B $B ; Move VBUF
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loadi 6 $10;
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shift 3 6 5; Shift To Second Byte
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loadi 6 $0000FF;
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and 6 5 5; Mask Off
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loadi 2 0; Set Pixel to 8
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call draw_char_pixels
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loadi 6 $278
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add $6 $B $B ; Move VBUF
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loadi 6 $8;
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shift 3 6 5; Shift To Third Byte
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loadi 6 $0000FF;
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and 6 5 5;
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loadi 2 0; Set Pixel to 8
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call draw_char_pixels
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loadi 6 $278
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add $6 $B $B ; Move VBUF
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loadi 6 $0;
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shift 3 6 5; Shift To 4th Byte
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loadi 6 $0000FF;
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and 6 5 5; MASK off last Byte
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loadi 2 0; Set Pixel to 8
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call draw_char_pixels
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ret
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label _scratch_draw_string:
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nop
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label draw_string:
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label draw_next_char:
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rload 4 3; Load Arg 1 in 3
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store 4 _scratch_draw_string
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loadi $2 $20 ; Load Addr of [SPACE] in $2
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sub $3 $2 $1 ; Sub the Character From Space
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loadi $2 2
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mul $1 $2 $1 ; Mull By 2
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loadi $2 char_space
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add $2 $1 $1 ; Add to Char Space
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tx $4 $1
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call draw_char; Call draw_char
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loadi $2 8
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add $2 $9 $9; // X = X + 9
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call set_pos
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load $4 _scratch_draw_string
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inc $4;
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rload 4 3; Load Arg 1 in 3
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tx $2 $3
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loadi $1 0
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jneq draw_next_char
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ret
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label num_to_charset:
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loadi $2 HEX_TABLE
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add $2 $4 $4
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rload 4 3; Load Arg 1 in 3
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loadi $2 $20 ; Load Addr of [SPACE] in $2
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sub $3 $2 $1 ; Sub the Character From Space
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loadi $2 2
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mul $1 $2 $1 ; Mull By 2
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loadi $2 char_space
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add $2 $1 $1 ; Add to Char Space
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tx $4 $1
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ret
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label num_to_char:
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loadi $2 HEX_TABLE
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add $2 $4 $4
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rload 4 3; Load Arg 1 in 3
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loadi $2 $20 ; Load Addr of [SPACE] in $2
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sub $3 $2 $1 ; Sub the Character From Space
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;loadi $2 2
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;mul $1 $2 $1 ; Mull By 2
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;loadi $2 char_space
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;add $2 $1 $1 ; Add to Char Space
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tx $4 $3
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ret
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; $4 contains pointer to a null terminated hex string
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; outputs num in $1
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label string_to_num:
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loadi $3 0
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loadi $5 4 ; bits to shift each time
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label string_to_num_inner:
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rload $4 $1 ; load char at $4 into $1
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loadi $2 $0 ; check that it isn't a null terminator
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jneq +3
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tx $1 $3
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ret
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; check this is a valid char
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loadi $2 20
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jgt +3
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loadi $1 0
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ret
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; sub 0x30 from char to get a normalized number
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loadi $2 $30
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sub $1 $2 $1
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loadi $2 $A
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jlt +3
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loadi $2 $7
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sub $1 $2 $1
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lshift $3 $5 $3
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add $1 $3 $3
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inc $4
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jmp string_to_num_inner
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ret |