54 lines
1.3 KiB
NASM
54 lines
1.3 KiB
NASM
; ========================================================================
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;
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; (C) Copyright 2023 by Molly Rocket, Inc., All Rights Reserved.
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;
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; This software is provided 'as-is', without any express or implied
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; warranty. In no event will the authors be held liable for any damages
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; arising from the use of this software.
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;
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; Please see https://computerenhance.com for further information
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;
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; ========================================================================
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; ========================================================================
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; LISTING 55
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; ========================================================================
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bits 16
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; Start image after one row, to avoid overwriting our code!
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mov bp, 64*4
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; Draw the solid rectangle red/blue/alpha
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mov dx, 64
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y_loop_start:
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mov cx, 64
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x_loop_start:
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mov byte [bp + 0], cl ; Red
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mov byte [bp + 1], 0 ; Green
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mov byte [bp + 2], dl ; Blue
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mov byte [bp + 3], 255 ; Alpha
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add bp, 4
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loop x_loop_start
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sub dx, 1
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jnz y_loop_start
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; Add the line rectangle green
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mov bp, 64*4 + 4*64 + 4
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mov bx, bp
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mov cx, 62
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outline_loop_start:
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mov byte [bp + 1], 255 ; Top line
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mov byte [bp + 61*64*4 + 1], 255 ; Bottom line
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mov byte [bx + 1], 255 ; Left line
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mov byte [bx + 61*4 + 1], 255 ; Right line
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add bp, 4
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add bx, 4*64
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loop outline_loop_start
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