FUNCTIONS

1. tdfx_in8
2. tdfx_in32
3. tdfx_out8
4. tdfx_out32
5. tdfx_wait
6. tdfx_waitidle

   1 /*
   2     SDL - Simple DirectMedia Layer
   3     Copyright (C) 1997, 1998, 1999, 2000, 2001  Sam Lantinga
   4 
   5     This library is free software; you can redistribute it and/or
   6     modify it under the terms of the GNU Library General Public
   7     License as published by the Free Software Foundation; either
   8     version 2 of the License, or (at your option) any later version.
   9 
  10     This library is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13     Library General Public License for more details.
  14 
  15     You should have received a copy of the GNU Library General Public
  16     License along with this library; if not, write to the Free
  17     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18 
  19     Sam Lantinga
  20     slouken@devolution.com
  21 */
  23 #ifdef SAVE_RCSID
  24 static char rcsid =
  25  "@(#) $Id: 3dfx_mmio.h,v 1.1.2.2 2001/02/10 07:20:06 hercules Exp $";
  26 #endif
  28 /* 3Dfx register definitions */
  30 #include "3dfx_regs.h"
  32 /* 3Dfx control macros */
  34 #define tdfx_in8(reg)           *(volatile Uint8  *)(mapped_io + (reg))
     /* [<][>][^][v][top][bottom][index][help] */
  35 #define tdfx_in32(reg)          *(volatile Uint32 *)(mapped_io + (reg))
     /* [<][>][^][v][top][bottom][index][help] */
  37 #define tdfx_out8(reg,v)        *(volatile Uint8  *)(mapped_io + (reg)) = v;
     /* [<][>][^][v][top][bottom][index][help] */
  38 #define tdfx_out32(reg,v)       *(volatile Uint32 *)(mapped_io + (reg)) = v;
     /* [<][>][^][v][top][bottom][index][help] */
  41 /* Wait for fifo space */
  42 #define tdfx_wait(space)                                                \
     /* [<][>][^][v][top][bottom][index][help] */
  43 {                                                                       \
  44         while ( (tdfx_in8(TDFX_STATUS) & 0x1F) < space )                \
  45                 ;                                                       \
  46 }
  49 /* Wait for idle accelerator */
  50 #define tdfx_waitidle()                                                 \
     /* [<][>][^][v][top][bottom][index][help] */
  51 {                                                                       \
  52         int i = 0;                                                      \
  53                                                                         \
tdfx_wait(1);                                                   \
tdfx_out32(COMMAND_3D, COMMAND_3D_NOP);                         \
  56         do {                                                            \
  57                 i = (tdfx_in32(TDFX_STATUS) & STATUS_BUSY) ? 0 : i + 1; \
  58         } while ( i != 3 );                                             \
  59 }