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#
# MMX format converters for HERMES
# Copyright (c) 1998 Christian Nentwich (c.nentwich@cs.ucl.ac.uk)
# This source code is licensed under the GNU LGPL
#
# Please refer to the file COPYING.LIB contained in the distribution for
# licensing conditions
#
# COPYRIGHT NOTICE
#
# This file partly contains code that is (c) Intel Corporation, specifically
# the mode detection routine, and the converter to 15 bit (8 pixel
# conversion routine from the mmx programming tutorial pages).
#
#BITS 32
.globl _ConvertMMXp32_16RGB555
.extern _mmxreturn
.data
.align 8
mmx32_rgb555_rb: .long 0x00f800f8,0x00f800f8 # Constants for conversion routines
mmx32_rgb555_add: .long 0x20000008,0x20000008
mmx32_rgb555_g: .long 0x0000f800,0x0000f800
.text
## Gone for now, it didnt draw correctly AND was slower than the x86 routine
_ConvertMMXp32_16RGB565:
jmp _mmxreturn
_ConvertMMXp32_16RGB555:
movq mmx32_rgb555_add,%mm7
movq mmx32_rgb555_g,%mm6
movl %ecx,%edx # Save ecx
andl $0x0fffffff8,%ecx # clear lower three bits
jnz _ConvertMMXp32_16RGB555.L_OK
jmp _ConvertMMXp32_16RGB555.L2
_ConvertMMXp32_16RGB555.L_OK:
movq 8(%esi),%mm2
movq (%esi),%mm0
movq %mm2,%mm3
pand mmx32_rgb555_rb,%mm3
movq %mm0,%mm1
pand mmx32_rgb555_rb,%mm1
pmaddwd %mm7,%mm3
pmaddwd %mm7,%mm1
pand %mm6,%mm2
_ConvertMMXp32_16RGB555.L1:
movq 24(%esi),%mm4
pand %mm6,%mm0
movq 16(%esi),%mm5
por %mm2,%mm3
psrld $6,%mm3
por %mm0,%mm1
movq %mm4,%mm0
psrld $6,%mm1
pand mmx32_rgb555_rb,%mm0
packssdw %mm3,%mm1
movq %mm5,%mm3
pmaddwd %mm7,%mm0
pand mmx32_rgb555_rb,%mm3
pand %mm6,%mm4
movq %mm1,(%edi)
pmaddwd %mm7,%mm3
addl $32,%esi
por %mm0,%mm4
pand %mm6,%mm5
psrld $6,%mm4
movq 8(%esi),%mm2
por %mm3,%mm5
movq (%esi),%mm0
psrld $6,%mm5
movq %mm2,%mm3
movq %mm0,%mm1
pand mmx32_rgb555_rb,%mm3
packssdw %mm4,%mm5
pand mmx32_rgb555_rb,%mm1
pand %mm6,%mm2
movq %mm5,8(%edi)
pmaddwd %mm7,%mm3
pmaddwd %mm7,%mm1
addl $16,%edi
subl $8,%ecx
jz _ConvertMMXp32_16RGB555.L2
jmp _ConvertMMXp32_16RGB555.L1
_ConvertMMXp32_16RGB555.L2:
movl %edx,%ecx
andl $7,%ecx
jz _ConvertMMXp32_16RGB555.L4
_ConvertMMXp32_16RGB555.L3:
movl (%esi),%ebx
addl $4,%esi
movl %ebx,%eax
movl %ebx,%edx
shrl $3,%eax
shrl $6,%edx
andl $0b0000000000011111,%eax
andl $0b0000001111100000,%edx
shrl $9,%ebx
orl %edx,%eax
andl $0b0111110000000000,%ebx
orl %ebx,%eax
movw %ax,(%edi)
addl $2,%edi
decl %ecx
jnz _ConvertMMXp32_16RGB555.L3
_ConvertMMXp32_16RGB555.L4:
jmp _mmxreturn
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