libogc/texconv.c

   1 /*-------------------------------------------------------------
   2
   3 texconv.c - Helper functions for GX texture conversion
   4
   5 Copyright (C) 2008
   6 softdev
   7 Michael Wiedenbauer (shagkur)
   8 Dave Murphy (WinterMute)
   9
  10 This software is provided 'as-is', without any express or implied
  11 warranty.  In no event will the authors be held liable for any
  12 damages arising from the use of this software.
  13
  14 Permission is granted to anyone to use this software for any
  15 purpose, including commercial applications, and to alter it and
  16 redistribute it freely, subject to the following restrictions:
  17
  18 1.      The origin of this software must not be misrepresented; you
  19 must not claim that you wrote the original software. If you use
  20 this software in a product, an acknowledgment in the product
  21 documentation would be appreciated but is not required.
  22
  23 2.      Altered source versions must be plainly marked as such, and
  24 must not be misrepresented as being the original software.
  25
  26 3.      This notice may not be removed or altered from any source
  27 distribution.
  28
  29 -------------------------------------------------------------*/
  30 #include <gctypes.h>
  31
  32 void MakeTexture565(const void *src,void *dst,s32 width,s32 height)
  33 {
  34         register u32 tmp0=0,tmp1=0,tmp2=0,tmp3=0;
  35
  36         __asm__ __volatile__ (
  37                 "       srwi            %6,%6,2\n"
  38                 "       srwi            %7,%7,2\n"
  39                 "       subi            %3,%4,4\n"
  40                 "       subi            %4,%4,8\n"
  41
  42                 "2:     mtctr           %6\n"
  43                 "       mr                      %0,%5\n"
  44                 //
  45                 "1:     lwz                     %1,0(%5)\n"
  46                 "       stwu            %1,8(%4)\n"
  47                 "       lwz                     %2,4(%5)\n"
  48                 "       stwu            %2,8(%3)\n"
  49
  50                 "       lwz                     %1,1024(%5)\n"
  51                 "       stwu            %1,8(%4)\n"
  52                 "       lwz                     %2,1028(%5)\n"
  53                 "       stwu            %2,8(%3)\n"
  54
  55                 "       lwz                     %1,2048(%5)\n"
  56                 "       stwu            %1,8(%4)\n"
  57                 "       lwz                     %2,2052(%5)\n"
  58                 "       stwu            %2,8(%3)\n"
  59
  60                 "       lwz                     %1,3072(%5)\n"
  61                 "       stwu            %1,8(%4)\n"
  62                 "       lwz                     %2,3076(%5)\n"
  63                 "       stwu            %2,8(%3)\n"
  64
  65                 "       addi            %5,%5,8\n"
  66                 "       bdnz            1b\n"
  67
  68                 "       addi            %5,%0,4096\n"
  69                 "       subic.          %7,%7,1\n"
  70                 "       bne                     2b"
  71                 //               0                        1                        2                3
  72                 : "=&b"(tmp0), "=&r"(tmp1), "=&r"(tmp2), "=&b"(tmp3)
  73                 //         4              5                 6               7
  74                 : "b"(dst), "b"(src), "r"(width), "r"(height)
  75                 : "memory"
  76         );
  77 }