quakeforge/qw/source/d_init.c

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/*
d_init.c
rasterization driver initialization
Copyright (C) 1996-1997 Id Software, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
$Id$
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "bothdefs.h"
#include "d_local.h"
#define NUM_MIPS 4
cvar_t *d_subdiv16;
cvar_t *d_mipcap;
cvar_t *d_mipscale;
surfcache_t *d_initial_rover;
qboolean d_roverwrapped;
int d_minmip;
float d_scalemip[NUM_MIPS - 1];
static float basemip[NUM_MIPS - 1] = { 1.0, 0.5 * 0.8, 0.25 * 0.8 };
extern int d_aflatcolor;
void (*d_drawspans) (espan_t *pspan);
/*
D_Init
*/
void
D_Init (void)
{
r_skydirect = 1;
r_drawpolys = false;
r_worldpolysbacktofront = false;
r_recursiveaffinetriangles = true;
r_pixbytes = 1;
r_aliasuvscale = 1.0;
}
void
D_Init_Cvars (void)
{
d_subdiv16 = Cvar_Get ("d_subdiv16", "1", CVAR_NONE, "Set to enable extreme perspective correction");
d_mipcap = Cvar_Get ("d_mipcap", "0", CVAR_NONE, "Detail level. 0 is highest, 3 is lowest.");
d_mipscale = Cvar_Get ("d_mipscale", "1", CVAR_NONE, "Detail level of objects. 0 is highest, 3 is lowest.");
}
/*
D_CopyRects
*/
void
D_CopyRects (vrect_t *prects, int transparent)
{
// this function is only required if the CPU doesn't have direct access to the
// back buffer, and there's some driver interface function that the driver
// doesn't support and requires Quake to do in software (such as drawing the
// console); Quake will then draw into wherever the driver points vid.buffer
// and will call this function before swapping buffers
UNUSED (prects);
UNUSED (transparent);
}
/*
D_EnableBackBufferAccess
*/
void
D_EnableBackBufferAccess (void)
{
VID_LockBuffer ();
}
/*
D_TurnZOn
*/
void
D_TurnZOn (void)
{
// not needed for software version
}
/*
D_DisableBackBufferAccess
*/
void
D_DisableBackBufferAccess (void)
{
VID_UnlockBuffer ();
}
/*
D_SetupFrame
*/
void
D_SetupFrame (void)
{
int i;
if (r_dowarp)
d_viewbuffer = r_warpbuffer;
else
d_viewbuffer = (void *) (byte *) vid.buffer;
if (r_dowarp)
screenwidth = WARP_WIDTH;
else
screenwidth = vid.rowbytes;
d_roverwrapped = false;
d_initial_rover = sc_rover;
d_minmip = bound (0, d_mipcap->value, 3);
for (i = 0; i < (NUM_MIPS - 1); i++)
d_scalemip[i] = basemip[i] * d_mipscale->value;
#ifdef USE_INTEL_ASM
if (d_subdiv16->int_val)
d_drawspans = D_DrawSpans16;
else
d_drawspans = D_DrawSpans8;
#else
d_drawspans = D_DrawSpans8;
#endif
d_aflatcolor = 0;
}
/*
D_UpdateRects
*/
void
D_UpdateRects (vrect_t *prect)
{
// the software driver draws these directly to the vid buffer
UNUSED (prect);
}