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      1 /*
      2     SDL - Simple DirectMedia Layer
      3     Copyright (C) 1997-2012 Sam Lantinga
      4 
      5     This library is free software; you can redistribute it and/or
      6     modify it under the terms of the GNU Lesser General Public
      7     License as published by the Free Software Foundation; either
      8     version 2.1 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     Lesser General Public License for more details.
     14 
     15     You should have received a copy of the GNU Lesser General Public
     16     License along with this library; if not, write to the Free Software
     17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
     18 
     19     Sam Lantinga
     20     slouken (at) libsdl.org
     21 */
     22 #include "SDL_config.h"
     23 
     24 /* 3Dfx register definitions */
     25 
     26 #include "3dfx_regs.h"
     27 
     28 /* 3Dfx control macros */
     29 
     30 #define tdfx_in8(reg)		*(volatile Uint8  *)(mapped_io + (reg))
     31 #define tdfx_in32(reg)		*(volatile Uint32 *)(mapped_io + (reg))
     32 
     33 #define tdfx_out8(reg,v)	*(volatile Uint8  *)(mapped_io + (reg)) = v;
     34 #define tdfx_out32(reg,v)	*(volatile Uint32 *)(mapped_io + (reg)) = v;
     35 
     36 
     37 /* Wait for fifo space */
     38 #define tdfx_wait(space)						\
     39 {									\
     40 	while ( (tdfx_in8(TDFX_STATUS) & 0x1F) < space )		\
     41 		;							\
     42 }
     43 
     44 
     45 /* Wait for idle accelerator */
     46 #define tdfx_waitidle()							\
     47 {									\
     48 	int i = 0;							\
     49 									\
     50 	tdfx_wait(1);							\
     51 	tdfx_out32(COMMAND_3D, COMMAND_3D_NOP);				\
     52 	do {								\
     53 		i = (tdfx_in32(TDFX_STATUS) & STATUS_BUSY) ? 0 : i + 1;	\
     54 	} while ( i != 3 );						\
     55 }
     56 
     57