| 1 | /* |
| 2 | SDL - Simple DirectMedia Layer |
| 3 | Copyright (C) 1997-2009 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 | |