Mercurial > sdl-ios-xcode
view src/hermes/x86p_16.asm @ 2237:e57a883ffa86
Advertise the most efficient format for the screen. Of course SDL code needs
to be fixed to handle framebuffers with alpha...
author | Sam Lantinga <slouken@libsdl.org> |
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date | Mon, 13 Aug 2007 02:38:59 +0000 |
parents | 180fa05e98e2 |
children |
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; ; x86 format converters for HERMES ; Copyright (c) 1998 Glenn Fielder (gaffer@gaffer.org) ; This source code is licensed under the GNU LGPL ; ; Please refer to the file COPYING.LIB contained in the distribution for ; licensing conditions ; ; Routines adjusted for Hermes by Christian Nentwich (brn@eleet.mcb.at) ; Used with permission. ; BITS 32 %include "common.inc" SDL_FUNC _ConvertX86p16_16BGR565 SDL_FUNC _ConvertX86p16_16RGB555 SDL_FUNC _ConvertX86p16_16BGR555 SDL_FUNC _ConvertX86p16_8RGB332 EXTERN _ConvertX86 SECTION .text _ConvertX86p16_16BGR565: ; check short cmp ecx,BYTE 16 ja .L3 .L1 ; short loop mov al,[esi] mov ah,[esi+1] mov ebx,eax mov edx,eax shr eax,11 and eax,BYTE 11111b and ebx,11111100000b shl edx,11 add eax,ebx add eax,edx mov [edi],al mov [edi+1],ah add esi,BYTE 2 add edi,BYTE 2 dec ecx jnz .L1 .L2 retn .L3 ; head mov eax,edi and eax,BYTE 11b jz .L4 mov al,[esi] mov ah,[esi+1] mov ebx,eax mov edx,eax shr eax,11 and eax,BYTE 11111b and ebx,11111100000b shl edx,11 add eax,ebx add eax,edx mov [edi],al mov [edi+1],ah add esi,BYTE 2 add edi,BYTE 2 dec ecx .L4 ; save count push ecx ; unroll twice shr ecx,1 ; point arrays to end lea esi,[esi+ecx*4] lea edi,[edi+ecx*4] ; negative counter neg ecx jmp SHORT .L6 .L5 mov [edi+ecx*4-4],eax .L6 mov eax,[esi+ecx*4] mov ebx,[esi+ecx*4] and eax,07E007E0h mov edx,[esi+ecx*4] and ebx,0F800F800h shr ebx,11 and edx,001F001Fh shl edx,11 add eax,ebx add eax,edx inc ecx jnz .L5 mov [edi+ecx*4-4],eax ; tail pop ecx and ecx,BYTE 1 jz .L7 mov al,[esi] mov ah,[esi+1] mov ebx,eax mov edx,eax shr eax,11 and eax,BYTE 11111b and ebx,11111100000b shl edx,11 add eax,ebx add eax,edx mov [edi],al mov [edi+1],ah add esi,BYTE 2 add edi,BYTE 2 .L7 retn _ConvertX86p16_16RGB555: ; check short cmp ecx,BYTE 32 ja .L3 .L1 ; short loop mov al,[esi] mov ah,[esi+1] mov ebx,eax shr ebx,1 and ebx, 0111111111100000b and eax,BYTE 0000000000011111b add eax,ebx mov [edi],al mov [edi+1],ah add esi,BYTE 2 add edi,BYTE 2 dec ecx jnz .L1 .L2 retn .L3 ; head mov eax,edi and eax,BYTE 11b jz .L4 mov al,[esi] mov ah,[esi+1] mov ebx,eax shr ebx,1 and ebx, 0111111111100000b and eax,BYTE 0000000000011111b add eax,ebx mov [edi],al mov [edi+1],ah add esi,BYTE 2 add edi,BYTE 2 dec ecx .L4 ; save ebp push ebp ; save count push ecx ; unroll four times shr ecx,2 ; point arrays to end lea esi,[esi+ecx*8] lea edi,[edi+ecx*8] ; negative counter xor ebp,ebp sub ebp,ecx .L5 mov eax,[esi+ebp*8] ; agi? mov ecx,[esi+ebp*8+4] mov ebx,eax mov edx,ecx and eax,0FFC0FFC0h and ecx,0FFC0FFC0h shr eax,1 and ebx,001F001Fh shr ecx,1 and edx,001F001Fh add eax,ebx add ecx,edx mov [edi+ebp*8],eax mov [edi+ebp*8+4],ecx inc ebp jnz .L5 ; tail pop ecx .L6 and ecx,BYTE 11b jz .L7 mov al,[esi] mov ah,[esi+1] mov ebx,eax shr ebx,1 and ebx, 0111111111100000b and eax,BYTE 0000000000011111b add eax,ebx mov [edi],al mov [edi+1],ah add esi,BYTE 2 add edi,BYTE 2 dec ecx jmp SHORT .L6 .L7 pop ebp retn _ConvertX86p16_16BGR555: ; check short cmp ecx,BYTE 16 ja .L3 .L1 ; short loop mov al,[esi] mov ah,[esi+1] mov ebx,eax mov edx,eax shr eax,11 and eax,BYTE 11111b shr ebx,1 and ebx,1111100000b shl edx,10 and edx,0111110000000000b add eax,ebx add eax,edx mov [edi],al mov [edi+1],ah add esi,BYTE 2 add edi,BYTE 2 dec ecx jnz .L1 .L2 retn .L3 ; head mov eax,edi and eax,BYTE 11b jz .L4 mov al,[esi] mov ah,[esi+1] mov ebx,eax mov edx,eax shr eax,11 and eax,BYTE 11111b shr ebx,1 and ebx,1111100000b shl edx,10 and edx,0111110000000000b add eax,ebx add eax,edx mov [edi],al mov [edi+1],ah add esi,BYTE 2 add edi,BYTE 2 dec ecx .L4 ; save count push ecx ; unroll twice shr ecx,1 ; point arrays to end lea esi,[esi+ecx*4] lea edi,[edi+ecx*4] ; negative counter neg ecx jmp SHORT .L6 .L5 mov [edi+ecx*4-4],eax .L6 mov eax,[esi+ecx*4] shr eax,1 mov ebx,[esi+ecx*4] and eax,03E003E0h mov edx,[esi+ecx*4] and ebx,0F800F800h shr ebx,11 and edx,001F001Fh shl edx,10 add eax,ebx add eax,edx inc ecx jnz .L5 mov [edi+ecx*4-4],eax ; tail pop ecx and ecx,BYTE 1 jz .L7 mov al,[esi] mov ah,[esi+1] mov ebx,eax mov edx,eax shr eax,11 and eax,BYTE 11111b shr ebx,1 and ebx,1111100000b shl edx,10 and edx,0111110000000000b add eax,ebx add eax,edx mov [edi],al mov [edi+1],ah add esi,BYTE 2 add edi,BYTE 2 .L7 retn _ConvertX86p16_8RGB332: ; check short cmp ecx,BYTE 16 ja .L3 .L1 ; short loop mov al,[esi+0] mov ah,[esi+1] mov ebx,eax mov edx,eax and eax,BYTE 11000b ; blue shr eax,3 and ebx,11100000000b ; green shr ebx,6 and edx,1110000000000000b ; red shr edx,8 add eax,ebx add eax,edx mov [edi],al add esi,BYTE 2 inc edi dec ecx jnz .L1 .L2 retn .L3 mov eax,edi and eax,BYTE 11b jz .L4 mov al,[esi+0] mov ah,[esi+1] mov ebx,eax mov edx,eax and eax,BYTE 11000b ; blue shr eax,3 and ebx,11100000000b ; green shr ebx,6 and edx,1110000000000000b ; red shr edx,8 add eax,ebx add eax,edx mov [edi],al add esi,BYTE 2 inc edi dec ecx jmp SHORT .L3 .L4 ; save ebp push ebp ; save count push ecx ; unroll 4 times shr ecx,2 ; prestep mov dl,[esi+0] mov bl,[esi+1] mov dh,[esi+2] .L5 shl edx,16 mov bh,[esi+3] shl ebx,16 mov dl,[esi+4] mov dh,[esi+6] mov bl,[esi+5] and edx,00011000000110000001100000011000b mov bh,[esi+7] ror edx,16+3 mov eax,ebx ; setup eax for reds and ebx,00000111000001110000011100000111b and eax,11100000111000001110000011100000b ; reds ror ebx,16-2 add esi,BYTE 8 ror eax,16 add edi,BYTE 4 add eax,ebx mov bl,[esi+1] ; greens add eax,edx mov dl,[esi+0] ; blues mov [edi-4],eax mov dh,[esi+2] dec ecx jnz .L5 ; check tail pop ecx and ecx,BYTE 11b jz .L7 .L6 ; tail mov al,[esi+0] mov ah,[esi+1] mov ebx,eax mov edx,eax and eax,BYTE 11000b ; blue shr eax,3 and ebx,11100000000b ; green shr ebx,6 and edx,1110000000000000b ; red shr edx,8 add eax,ebx add eax,edx mov [edi],al add esi,BYTE 2 inc edi dec ecx jnz .L6 .L7 pop ebp retn %ifidn __OUTPUT_FORMAT__,elf section .note.GNU-stack noalloc noexec nowrite progbits %endif