/*
* 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.
//
//****************************************************************

//****************************************************************
// 8-bit Horizontal Mirror

static inline void mirror8bS(uint8_t *tex, uint8_t *start, int width, int height, int mask, int line, int full, int count)
{
  uint8_t *v8;
  int v9;
  int v10;

  v8 = start;
  v9 = height;
  do
  {
    v10 = 0;
    do
    {
      if ( width & (v10 + width) )
        *v8++ = *(&tex[mask] - (mask & v10));
      else
        *v8++ = tex[mask & v10];
      ++v10;
    }
    while ( v10 != count );
    v8 += line;
    tex += full;
    --v9;
  }
  while ( v9 );
}

static inline void wrap8bS(uint8_t *tex, uint8_t *start, int height, int mask, int line, int full, int count)
{
  uint32_t *v7;
  int v8;
  int v9;

  v7 = (uint32_t *)start;
  v8 = height;
  do
  {
    v9 = 0;
    do
    {
      *v7 = *(uint32_t *)&tex[4 * (mask & v9)];
      ++v7;
      ++v9;
    }
    while ( v9 != count );
    v7 = (uint32_t *)((char *)v7 + line);
    tex += full;
    --v8;
  }
  while ( v8 );
}

static inline void clamp8bS(uint8_t *tex, uint8_t *constant, int height, int line, int full, int count)
{
  uint8_t *v6;
  uint8_t *v7;
  int v8;
  uint8_t v9;
  int v10;

  v6 = constant;
  v7 = tex;
  v8 = height;
  do
  {
    v9 = *v6;
    v10 = count;
    do
    {
      *v7++ = v9;
      --v10;
    }
    while ( v10 );
    v6 += full;
    v7 += line;
    --v8;
  }
  while ( v8 );
}

void Mirror8bS (unsigned char * tex, uint32_t mask, uint32_t max_width, uint32_t real_width, uint32_t height)
{
  if (mask == 0) return;

  uint32_t mask_width = (1 << mask);
  uint32_t mask_mask = (mask_width-1);
  if (mask_width >= max_width) return;
  int count = max_width - mask_width;
  if (count <= 0) return;
  int line_full = real_width;
  int line = line_full - (count);
  if (line < 0) return;
  unsigned char * start = tex + (mask_width);
  mirror8bS (tex, start, mask_width, height, mask_mask, line, line_full, count);
}

//****************************************************************
// 8-bit Horizontal Wrap (like mirror) ** UNTESTED **


void Wrap8bS (unsigned char * tex, uint32_t mask, uint32_t max_width, uint32_t real_width, uint32_t height)
{
  if (mask == 0) return;

  uint32_t mask_width = (1 << mask);
  uint32_t mask_mask = (mask_width-1) >> 2;
  if (mask_width >= max_width) return;
  int count = (max_width - mask_width) >> 2;
  if (count <= 0) return;
  int line_full = real_width;
  int line = line_full - (count << 2);
  if (line < 0) return;
  unsigned char * start = tex + (mask_width);
  wrap8bS (tex, start, height, mask_mask, line, line_full, count);
}

//****************************************************************
// 8-bit Horizontal Clamp


void Clamp8bS (unsigned char * tex, uint32_t width, uint32_t clamp_to, uint32_t real_width, uint32_t real_height)
{
  if (real_width <= width) return;

  unsigned char * dest = tex + (width);
  unsigned char * constant = dest-1;
  int count = clamp_to - width;

  int line_full = real_width;
  int line = width;
  clamp8bS (dest, constant, real_height, line, line_full, count);
}

//****************************************************************
// 8-bit Vertical Mirror

void Mirror8bT (unsigned char * tex, uint32_t mask, uint32_t max_height, uint32_t real_width)
{
  if (mask == 0) return;

  uint32_t mask_height = (1 << mask);
  uint32_t mask_mask = mask_height-1;
  if (max_height <= mask_height) return;
  int line_full = real_width;

  unsigned char * dst = tex + mask_height * line_full;

  for (uint32_t y=mask_height; y<max_height; y++)
  {
    if (y & mask_height)
    {
      // mirrored
      memcpy ((void*)dst, (void*)(tex + (mask_mask - (y & mask_mask)) * line_full), line_full);
    }
    else
    {
      // not mirrored
      memcpy ((void*)dst, (void*)(tex + (y & mask_mask) * line_full), line_full);
    }

    dst += line_full;
  }
}

//****************************************************************
// 8-bit Vertical Wrap

void Wrap8bT (unsigned char * tex, uint32_t mask, uint32_t max_height, uint32_t real_width)
{
  if (mask == 0) return;

  uint32_t mask_height = (1 << mask);
  uint32_t mask_mask = mask_height-1;
  if (max_height <= mask_height) return;
  int line_full = real_width;

  unsigned char * dst = tex + mask_height * line_full;

  for (uint32_t y=mask_height; y<max_height; y++)
  {
    // not mirrored
    memcpy ((void*)dst, (void*)(tex + (y & mask_mask) * line_full), line_full);

    dst += line_full;
  }
}

//****************************************************************
// 8-bit Vertical Clamp

void Clamp8bT (unsigned char * tex, uint32_t height, uint32_t real_width, uint32_t clamp_to)
{
  int line_full = real_width;
  unsigned char * dst = tex + height * line_full;
  unsigned char * const_line = dst - line_full;

  for (uint32_t y=height; y<clamp_to; y++)
  {
    memcpy ((void*)dst, (void*)const_line, line_full);
    dst += line_full;
  }
}