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- /*
- 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 the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-
- */
- // d_init.c: rasterization driver initialization
-
- #include "quakedef.h"
- #include "d_local.h"
-
- #define NUM_MIPS 4
-
- cvar_t d_subdiv16 = {"d_subdiv16", "1"};
- cvar_t d_mipcap = {"d_mipcap", "0"};
- cvar_t d_mipscale = {"d_mipscale", "1"};
-
- 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;
-
- Cvar_RegisterVariable (&d_subdiv16);
- Cvar_RegisterVariable (&d_mipcap);
- Cvar_RegisterVariable (&d_mipscale);
-
- r_drawpolys = false;
- r_worldpolysbacktofront = false;
- r_recursiveaffinetriangles = true;
- r_pixbytes = 1;
- r_aliasuvscale = 1.0;
- }
-
-
- /*
- ===============
- 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 = d_mipcap.value;
- if (d_minmip > 3)
- d_minmip = 3;
- else if (d_minmip < 0)
- d_minmip = 0;
-
- for (i=0 ; i<(NUM_MIPS-1) ; i++)
- d_scalemip[i] = basemip[i] * d_mipscale.value;
-
- #if id386
- if (d_subdiv16.value)
- 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);
- }
-
-