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@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