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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@devolution.com
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* 3Dfx register definitions */
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29
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30 #include "3dfx_regs.h"
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31
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32 /* 3Dfx control macros */
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33
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34 #define tdfx_in8(reg) *(volatile Uint8 *)(mapped_io + (reg))
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35 #define tdfx_in32(reg) *(volatile Uint32 *)(mapped_io + (reg))
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36
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37 #define tdfx_out8(reg,v) *(volatile Uint8 *)(mapped_io + (reg)) = v;
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38 #define tdfx_out32(reg,v) *(volatile Uint32 *)(mapped_io + (reg)) = v;
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39
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40
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41 /* Wait for fifo space */
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42 #define tdfx_wait(space) \
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43 { \
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44 while ( (tdfx_in8(TDFX_STATUS) & 0x1F) < space ) \
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45 ; \
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46 }
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47
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48
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49 /* Wait for idle accelerator */
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50 #define tdfx_waitidle() \
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51 { \
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52 int i = 0; \
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53 \
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54 tdfx_wait(1); \
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55 tdfx_out32(COMMAND_3D, COMMAND_3D_NOP); \
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56 do { \
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57 i = (tdfx_in32(TDFX_STATUS) & STATUS_BUSY) ? 0 : i + 1; \
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58 } while ( i != 3 ); \
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59 }
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60
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