src/hermes/mmx_main.asm
author Sam Lantinga <slouken@lokigames.com>
Thu, 26 Apr 2001 16:45:43 +0000
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;
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; mmx format converter main loops for HERMES
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; Some routines Copyright (c) 1998 Christian Nentwich (c.nentwich@cs.ucl.ac.uk)
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; This source code is licensed under the GNU LGPL
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; 
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; Please refer to the file COPYING.LIB contained in the distribution for
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; licensing conditions		
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;
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BITS 32
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GLOBAL _ConvertMMX
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GLOBAL _mmxreturn
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SECTION .text
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;; _ConvertMMX:	 
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;; [ESP+8] ConverterInfo*
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;; --------------------------------------------------------------------------
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;; ConverterInfo (ebp+..)
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;;   0:	void *s_pixels
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;;   4:	int s_width
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;;   8:	int s_height
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;;  12:	int s_add
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;;  16:	void *d_pixels
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;;  20:	int d_width
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;;  24:	int d_height
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;;  28:	int d_add
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;;  32:	void (*converter_function)() 
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;;  36: int32 *lookup
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_ConvertMMX:
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	push ebp
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	mov ebp,esp
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; Save the registers used by the blitters, necessary for optimized code
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	pusha
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	mov eax,[ebp+8]
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        cmp dword [eax+4],BYTE 0
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	je endconvert
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	mov ebp,eax
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	mov esi,[ebp+0]
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	mov edi,[ebp+16]
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y_loop:	
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	mov ecx,[ebp+4]
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	jmp [ebp+32]
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_mmxreturn:	
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	add esi,[ebp+12]
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	add edi,[ebp+28]
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	dec dword  [ebp+8]
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	jnz y_loop
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; Restore the registers used by the blitters, necessary for optimized code
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	popa
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	pop ebp
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endconvert:
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	emms
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	ret		
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