/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997-2006 Sam Lantinga

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Lesser General Public

License as published by the Free Software Foundation; either

version 2.1 of the License, or (at your option) any later version.

This library 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

Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public

License along with this library; if not, write to the Free Software

Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

Sam Lantinga

slouken@libsdl.org

*/

#include "SDL_config.h"

/* 3Dfx register definitions */

#include "3dfx_regs.h"

/* 3Dfx control macros */

#define tdfx_in8(reg) *(volatile Uint8 *)(mapped_io + (reg))

#define tdfx_in32(reg) *(volatile Uint32 *)(mapped_io + (reg))

#define tdfx_out8(reg,v) *(volatile Uint8 *)(mapped_io + (reg)) = v;

#define tdfx_out32(reg,v) *(volatile Uint32 *)(mapped_io + (reg)) = v;

/* Wait for fifo space */

#define tdfx_wait(space) \

{ \

while ( (tdfx_in8(TDFX_STATUS) & 0x1F) < space ) \

; \

}

/* Wait for idle accelerator */

#define tdfx_waitidle() \

{ \

int i = 0; \

\

tdfx_wait(1); \

tdfx_out32(COMMAND_3D, COMMAND_3D_NOP); \

do { \

i = (tdfx_in32(TDFX_STATUS) & STATUS_BUSY) ? 0 : i + 1; \

} while ( i != 3 ); \

}