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1.1 root 1: /*
2: Copyright (C) 1996-1997 Id Software, Inc.
3:
4: This program is free software; you can redistribute it and/or
5: modify it under the terms of the GNU General Public License
6: as published by the Free Software Foundation; either version 2
7: of the License, or (at your option) any later version.
8:
9: This program is distributed in the hope that it will be useful,
10: but WITHOUT ANY WARRANTY; without even the implied warranty of
11: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12:
13: See the GNU General Public License for more details.
14:
15: You should have received a copy of the GNU General Public License
16: along with this program; if not, write to the Free Software
17: Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18:
19: */
20: // d_init.c: rasterization driver initialization
21:
22: #include "quakedef.h"
23: #include "d_local.h"
24:
25: #define NUM_MIPS 4
26:
27: cvar_t d_subdiv16 = {"d_subdiv16", "1"};
28: cvar_t d_mipcap = {"d_mipcap", "0"};
29: cvar_t d_mipscale = {"d_mipscale", "1"};
30:
31: surfcache_t *d_initial_rover;
32: qboolean d_roverwrapped;
33: int d_minmip;
34: float d_scalemip[NUM_MIPS-1];
35:
36: static float basemip[NUM_MIPS-1] = {1.0, 0.5*0.8, 0.25*0.8};
37:
38: extern int d_aflatcolor;
39:
40: void (*d_drawspans) (espan_t *pspan);
41:
42:
43: /*
44: ===============
45: D_Init
46: ===============
47: */
48: void D_Init (void)
49: {
50:
51: r_skydirect = 1;
52:
53: Cvar_RegisterVariable (&d_subdiv16);
54: Cvar_RegisterVariable (&d_mipcap);
55: Cvar_RegisterVariable (&d_mipscale);
56:
57: r_drawpolys = false;
58: r_worldpolysbacktofront = false;
59: r_recursiveaffinetriangles = true;
60: r_pixbytes = 1;
61: r_aliasuvscale = 1.0;
62: }
63:
64:
65: /*
66: ===============
67: D_CopyRects
68: ===============
69: */
70: void D_CopyRects (vrect_t *prects, int transparent)
71: {
72:
73: // this function is only required if the CPU doesn't have direct access to the
74: // back buffer, and there's some driver interface function that the driver
75: // doesn't support and requires Quake to do in software (such as drawing the
76: // console); Quake will then draw into wherever the driver points vid.buffer
77: // and will call this function before swapping buffers
78:
79: UNUSED(prects);
80: UNUSED(transparent);
81: }
82:
83:
84: /*
85: ===============
86: D_EnableBackBufferAccess
87: ===============
88: */
89: void D_EnableBackBufferAccess (void)
90: {
91:
92: VID_LockBuffer ();
93: }
94:
95:
96: /*
97: ===============
98: D_TurnZOn
99: ===============
100: */
101: void D_TurnZOn (void)
102: {
103: // not needed for software version
104: }
105:
106:
107: /*
108: ===============
109: D_DisableBackBufferAccess
110: ===============
111: */
112: void D_DisableBackBufferAccess (void)
113: {
114: VID_UnlockBuffer ();
115: }
116:
117:
118: /*
119: ===============
120: D_SetupFrame
121: ===============
122: */
123: void D_SetupFrame (void)
124: {
125: int i;
126:
127: if (r_dowarp)
128: d_viewbuffer = r_warpbuffer;
129: else
130: d_viewbuffer = (void *)(byte *)vid.buffer;
131:
132: if (r_dowarp)
133: screenwidth = WARP_WIDTH;
134: else
135: screenwidth = vid.rowbytes;
136:
137: d_roverwrapped = false;
138: d_initial_rover = sc_rover;
139:
140: d_minmip = d_mipcap.value;
141: if (d_minmip > 3)
142: d_minmip = 3;
143: else if (d_minmip < 0)
144: d_minmip = 0;
145:
146: for (i=0 ; i<(NUM_MIPS-1) ; i++)
147: d_scalemip[i] = basemip[i] * d_mipscale.value;
148:
149: #if id386
150: if (d_subdiv16.value)
151: d_drawspans = D_DrawSpans16;
152: else
153: d_drawspans = D_DrawSpans8;
154: #else
155: d_drawspans = D_DrawSpans8;
156: #endif
157:
158: d_aflatcolor = 0;
159: }
160:
161:
162: /*
163: ===============
164: D_UpdateRects
165: ===============
166: */
167: void D_UpdateRects (vrect_t *prect)
168: {
169:
170: // the software driver draws these directly to the vid buffer
171:
172: UNUSED(prect);
173: }
174:
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