213 lines
4 KiB
NASM
213 lines
4 KiB
NASM
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;***************************************************************************/
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;* */
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;* */
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;* Raven 3D Engine */
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;* Copyright (C) 1995 by Softdisk Publishing */
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;* */
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;* Original Design: */
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;* John Carmack of id Software */
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;* */
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;* Enhancements by: */
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;* Robert Morgan of Channel 7............................Main Engine Code */
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;* Todd Lewis of Softdisk Publishing......Tools,Utilities,Special Effects */
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;* John Bianca of Softdisk Publishing..............Low-level Optimization */
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;* Carlos Hasan..........................................Music/Sound Code */
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;* */
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;* */
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;***************************************************************************/
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.386
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.MODEL flat
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SCREEN = 0a0000h
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SCREENWIDTH = 320
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SCREENHEIGHT = 200
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MOUSESIZE = 16
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.DATA
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EXTRN hiding: DWORD
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EXTRN busy: DWORD
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EXTRN mousex: DWORD
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EXTRN mousey: DWORD
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EXTRN fore: DWORD
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EXTRN back: DWORD
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.CODE
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public MouseHide
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MouseHide proc near
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cli
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cmp [busy], 0
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je @@checkhide
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sti
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ret
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@@checkhide:
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cmp [hiding], 0
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je @@mcontinue
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inc [hiding]
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sti
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ret
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@@mcontinue:
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mov [busy], 1
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sti
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push esi
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push edi
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push ebx
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push ebp
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mov esi, offset back
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mov edx, [mousex]
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cmp edx, 319-MOUSESIZE
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jg @@overflowx
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mov edx, MOUSESIZE
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jmp @@nooverflow
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@@overflowx:
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mov edx, SCREENWIDTH
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sub edx, [mousex]
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@@nooverflow:
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mov ebp, [mousey]
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cmp ebp, 199-MOUSESIZE
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jg @@overflowy
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mov ebp, MOUSESIZE
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jmp @@drawset
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@@overflowy:
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mov ebp, SCREENHEIGHT
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sub ebp, [mousey]
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@@drawset:
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mov ebx, ebp
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mov eax, [mousey]
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imul edi, eax, 320
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add edi, [mousex]
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add edi, SCREEN
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@@loop:
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mov ecx, edx
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rep movsb
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add edi, SCREENWIDTH
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sub edi, edx
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dec ebx
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jnz @@loop
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pop ebp
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pop ebx
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pop edi
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pop esi
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mov [hiding], 1
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mov [busy], 0
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ret
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endp
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;==========================================================================
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public MouseShow
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MouseShow proc near
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cli
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cmp [busy], 0
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je @@checkhide2
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sti
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ret
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@@checkhide2:
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cmp [hiding], 1
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je @@notshown2
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dec [hiding]
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sti
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ret
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@@notshown2:
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mov [busy], 1
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sti
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push esi
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push edi
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push ebx
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push ebp
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mov edx, [mousex]
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mov ebx, edx
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mov ebp, [mousey]
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mov ecx, ebp
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mov edi, offset back
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cmp edx, 319-MOUSESIZE
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jg @@overflowx2
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mov edx, MOUSESIZE
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jmp @@nooverflow2
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@@overflowx2:
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mov edx, SCREENWIDTH
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sub edx, ebx
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@@nooverflow2:
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cmp ebp, 199-MOUSESIZE
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jg @@overflowy2
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mov ebp, MOUSESIZE
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jmp @@drawset2
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@@overflowy2:
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mov ebp, SCREENHEIGHT
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sub ebp, ecx
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@@drawset2:
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mov eax, ecx
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imul esi, eax, 320
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add esi, ebx
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add esi, SCREEN
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mov ebx, ebp
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@@loop2:
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mov ecx, edx
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rep movsb
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add esi, SCREENWIDTH
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sub esi, edx
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dec ebx
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jnz @@loop2
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mov ebx, ebp
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mov esi, offset fore
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mov eax, [mousey]
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dec eax
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imul edi, eax, 320
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add edi, [mousex]
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add edi, SCREEN
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add edi, edx
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sub esi, MOUSESIZE
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add esi, edx
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@@loopy2:
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add edi, SCREENWIDTH
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sub edi, edx
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mov ecx, edx
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add esi, MOUSESIZE
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sub esi, edx
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@@loopx2:
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mov al, [esi]
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cmp al, 255
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je @@mcontinue2
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mov [edi], al
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@@mcontinue2:
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inc edi
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inc esi
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dec ecx
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jnz @@loopx2
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dec ebx
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jnz @@loopy2
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pop ebp
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pop ebx
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pop edi
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pop esi
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mov [hiding], 0
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mov [busy], 0
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ret
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MouseShow endp
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END
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