project64/Source/Glide64/TexLoad16b.h

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

extern "C" void asmLoad16bRGBA (wxUIntPtr src, wxUIntPtr dst, int wid_64, int height, int line, int ext);
extern "C" void asmLoad16bIA (wxUIntPtr src, wxUIntPtr dst, int wid_64, int height, int line, int ext);


//****************************************************************
// Size: 2, Format: 0
//

wxUint32 Load16bRGBA (wxUIntPtr dst, wxUIntPtr src, int wid_64, int height, int line, int real_width, int /*tile*/)
{
  if (wid_64 < 1) wid_64 = 1;
  if (height < 1) height = 1;
  int ext = (real_width - (wid_64 << 2)) << 1;

  asmLoad16bRGBA(src, dst, wid_64, height, line, ext);

  return (1 << 16) | GR_TEXFMT_ARGB_1555;
}

//****************************************************************
// Size: 2, Format: 3
//

wxUint32 Load16bIA (wxUIntPtr dst, wxUIntPtr src, int wid_64, int height, int line, int real_width, int /*tile*/)
{
  if (wid_64 < 1) wid_64 = 1;
  if (height < 1) height = 1;
  int ext = (real_width - (wid_64 << 2)) << 1;

  asmLoad16bIA(src, dst, wid_64, height, line, ext);

  return (1 << 16) | GR_TEXFMT_ALPHA_INTENSITY_88;
}

//****************************************************************
// Size: 2, Format: 1
//

wxUint16 yuv_to_rgb565(wxUint8 y, wxUint8 u, wxUint8 v)
{
  //*
  float r = y + (1.370705f * (v-128));
  float g = y - (0.698001f * (v-128)) - (0.337633f * (u-128));
  float b = y + (1.732446f * (u-128));
  r *= 0.125f;
  g *= 0.25f;
  b *= 0.125f;
  //clipping the result
  if (r > 31) r = 31;
  if (g > 63) g = 63;
  if (b > 31) b = 31;
  if (r < 0) r = 0;
  if (g < 0) g = 0;
  if (b < 0) b = 0;
  wxUint16 c = (wxUint16)(((wxUint16)(r) << 11) |
    ((wxUint16)(g) << 5) |
    (wxUint16)(b) );
  return c;
  //*/
  /*
  const wxUint32 c = y - 16;
  const wxUint32 d = u - 128;
  const wxUint32 e = v - 128;

  wxUint32 r =  (298 * c           + 409 * e + 128) & 0xf800;
  wxUint32 g = ((298 * c - 100 * d - 208 * e + 128) >> 5) & 0x7e0;
  wxUint32 b = ((298 * c + 516 * d           + 128) >> 11) & 0x1f;

  WORD texel = (WORD)(r | g | b);

  return texel;
  */
}

//****************************************************************
// Size: 2, Format: 1
//

wxUint32 Load16bYUV (wxUIntPtr dst, wxUIntPtr /*src*/, int /*wid_64*/, int /*height*/, int /*line*/, int /*real_width*/, int tile)
{
  wxUint32 * mb = (wxUint32*)(gfx.RDRAM+rdp.addr[rdp.tiles[tile].t_mem]); //pointer to the macro block
  wxUint16 * tex = (wxUint16*)dst;
  wxUint16 i;
  for (i = 0; i < 128; i++)
  {
    wxUint32 t = mb[i]; //each wxUint32 contains 2 pixels
    wxUint8 y1 = (wxUint8)t&0xFF;
    wxUint8 v  = (wxUint8)(t>>8)&0xFF;
    wxUint8 y0 = (wxUint8)(t>>16)&0xFF;
    wxUint8 u  = (wxUint8)(t>>24)&0xFF;
    wxUint16 c = yuv_to_rgb565(y0, u, v);
    *(tex++) = c;
    c = yuv_to_rgb565(y1, u, v);
    *(tex++) = c;
  }
  return (1 << 16) | GR_TEXFMT_RGB_565;
}