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