Glide Plugin GLES2 port from mupen64plus-ae, but with special FrameSkip code

[mupen64plus-pandora.git] / source / gles2glide64 / src / Glide64 / CRC.cpp

diff --git a/source/gles2glide64/src/Glide64/CRC.cpp b/source/gles2glide64/src/Glide64/CRC.cpp
new file mode 100755 (executable)
index 0000000..aadf78e
--- /dev/null
+++ b/source/gles2glide64/src/Glide64/CRC.cpp
@@ -0,0 +1,144 @@
+/*
+* Glide64 - Glide video plugin for Nintendo 64 emulators.
+* Copyright (c) 2002  Dave2001
+* Copyright (c) 2003-2009  Sergey 'Gonetz' Lipski
+*
+* This program is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation; either version 2 of the License, or
+* any later version.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with this program; if not, write to the Free Software
+* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+//****************************************************************
+//
+// Glide64 - Glide Plugin for Nintendo 64 emulators
+// Project started on December 29th, 2001
+//
+// Authors:
+// Dave2001, original author, founded the project in 2001, left it in 2002
+// Gugaman, joined the project in 2002, left it in 2002
+// Sergey 'Gonetz' Lipski, joined the project in 2002, main author since fall of 2002
+// Hiroshi 'KoolSmoky' Morii, joined the project in 2007
+//
+//****************************************************************
+//
+// To modify Glide64:
+// * Write your name and (optional)email, commented by your work, so I know who did it, and so that you can find which parts you modified when it comes time to send it to me.
+// * Do NOT send me the whole project or file that you modified.  Take out your modified code sections, and tell me where to put them.  If people sent the whole thing, I would have many different versions, but no idea how to combine them all.
+//
+//****************************************************************
+//
+// CRC32 calculation functions 
+//
+// Created by Gonetz, 2004
+//
+//****************************************************************
+//*
+
+#define CRC32_POLYNOMIAL     0x04C11DB7
+
+unsigned int CRCTable[ 256 ];
+
+unsigned int Reflect( unsigned int ref, char ch )
+{
+     unsigned int value = 0;
+
+     // Swap bit 0 for bit 7
+     // bit 1 for bit 6, etc.
+     for (char i = 1; i < (ch + 1); i++)
+     {
+          if(ref & 1)
+               value |= 1 << (ch - i);
+          ref >>= 1;
+     }
+     return value;
+}
+
+void CRC_BuildTable()
+{
+    unsigned int crc;
+
+    for (unsigned i = 0; i <= 255; i++)
+       {
+        crc = Reflect( i, 8 ) << 24;
+        for (unsigned j = 0; j < 8; j++)
+                       crc = (crc << 1) ^ (crc & (1 << 31) ? CRC32_POLYNOMIAL : 0);
+        
+        CRCTable[i] = Reflect( crc, 32 );
+    }
+}
+//*/
+//*
+unsigned int CRC32( unsigned int crc, void *buffer, unsigned int count )
+{
+  unsigned int orig = crc;
+  unsigned char * p = reinterpret_cast<unsigned char*>(buffer);
+  while (count--)
+    crc = (crc >> 8) ^ CRCTable[(crc & 0xFF) ^ *p++];
+  return crc ^ orig;
+}
+//*/
+
+/*
+wxUint32 CRC_Calculate( wxUint32 crc, void *buffer, wxUint32 count )
+{
+  wxUint32 Crc32=crc;
+  __asm {
+                       mov     esi, buffer
+                       mov     ecx, count
+                       mov     edx, crc
+                       xor eax, eax
+
+loop1:
+                       inc     esi
+                       mov     al, dl
+                       xor     al, byte ptr [esi]
+                       shr     edx, 8
+                       mov     ebx, [CRCTable+eax*4]
+                       xor     edx, ebx
+
+                       loop loop1
+
+                       xor     Crc32, edx
+   }
+   return Crc32;
+}
+*/
+
+/*
+unsigned int CRC_Calculate( unsigned int crc, void *buffer, unsigned int count )
+{
+  unsigned int Crc32=crc;
+  __asm {
+                       mov     esi, buffer
+                       mov     edx, count
+                       add     edx, esi
+                       mov     ecx, crc
+
+loop1:
+                       mov     bl, byte ptr [esi]
+                       movzx   eax, cl
+                       inc     esi
+                       xor     al, bl
+                       shr     ecx, 8
+                       mov     ebx, [CRCTable+eax*4]
+                       xor     ecx, ebx
+
+                       cmp     edx, esi
+                       jne     loop1
+
+                       xor     Crc32, ecx
+   }
+   return Crc32;
+}
+//*/
+