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3dfx_mmio.h
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2009 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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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
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Lesser General Public License for more details.
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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
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/* 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 ); \
}
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/* vi: set ts=4 sw=4 expandtab: */