quakeforge/libs/video/renderer/sw/d_surf.c

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/*
d_surf.c
rasterization driver surface heap manager
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
*/
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static const char rcsid[] =
"$Id$";
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdlib.h>
#include "QF/qargs.h"
#include "QF/sys.h"
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#include "compat.h"
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#include "d_local.h"
#include "r_local.h"
float surfscale;
qboolean r_cache_thrash; // set if surface cache is thrashing
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int sc_size;
surfcache_t *sc_rover, *sc_base;
#define GUARDSIZE 4
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void *
D_SurfaceCacheAddress (void)
{
return sc_base;
}
int
D_SurfaceCacheForRes (int width, int height)
{
int size, pix;
if (COM_CheckParm ("-surfcachesize")) {
size = atoi (com_argv[COM_CheckParm ("-surfcachesize") + 1]) * 1024;
return size;
}
size = SURFCACHE_SIZE_AT_320X200;
pix = width * height;
if (pix > 64000)
size += (pix - 64000) * 3;
return size;
}
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void
D_CheckCacheGuard (void)
{
byte *s;
int i;
s = (byte *) sc_base + sc_size;
for (i = 0; i < GUARDSIZE; i++)
if (s[i] != (byte) i)
Sys_Error ("D_CheckCacheGuard: failed");
}
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void
D_ClearCacheGuard (void)
{
byte *s;
int i;
s = (byte *) sc_base + sc_size;
for (i = 0; i < GUARDSIZE; i++)
s[i] = (byte) i;
}
void
D_InitCaches (void *buffer, int size)
{
// if (!msg_suppress_1)
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// Con_Printf ("%ik surface cache\n", size/1024);
sc_size = size - GUARDSIZE;
sc_base = (surfcache_t *) buffer;
sc_rover = sc_base;
sc_base->next = NULL;
sc_base->owner = NULL;
sc_base->size = sc_size;
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d_pzbuffer = vid.zbuffer;
D_ClearCacheGuard ();
}
void
D_FlushCaches (void)
{
surfcache_t *c;
if (!sc_base)
return;
for (c = sc_base; c; c = c->next) {
if (c->owner)
*c->owner = NULL;
}
sc_rover = sc_base;
sc_base->next = NULL;
sc_base->owner = NULL;
sc_base->size = sc_size;
}
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surfcache_t *
D_SCAlloc (int width, int size)
{
surfcache_t *new;
qboolean wrapped_this_time;
if ((width < 0) || (width > 512)) // FIXME shouldn't really have a max
Sys_Error ("D_SCAlloc: bad cache width %d", width);
if ((size <= 0) || (size > 0x40000)) // FIXME ditto
Sys_Error ("D_SCAlloc: bad cache size %d", size);
/* This adds the offset of data[0] in the surfcache_t struct. */
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size += field_offset (surfcache_t, data);
#define SIZE_ALIGN (sizeof(surfcache_t*)-1)
size = (size + SIZE_ALIGN) & ~SIZE_ALIGN;
#undef SIZE_ALIGN
size = (size + 3) & ~3;
if (size > sc_size)
Sys_Error ("D_SCAlloc: %i > cache size", size);
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// if there is not size bytes after the rover, reset to the start
wrapped_this_time = false;
if (!sc_rover || (byte *) sc_rover - (byte *) sc_base > sc_size - size) {
if (sc_rover) {
wrapped_this_time = true;
}
sc_rover = sc_base;
}
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// colect and free surfcache_t blocks until the rover block is large enough
new = sc_rover;
if (sc_rover->owner)
*sc_rover->owner = NULL;
while (new->size < size) {
// free another
sc_rover = sc_rover->next;
if (!sc_rover)
Sys_Error ("D_SCAlloc: hit the end of memory");
if (sc_rover->owner)
*sc_rover->owner = NULL;
new->size += sc_rover->size;
new->next = sc_rover->next;
}
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// create a fragment out of any leftovers
if (new->size - size > 256) {
sc_rover = (surfcache_t *) ((byte *) new + size);
sc_rover->size = new->size - size;
sc_rover->next = new->next;
sc_rover->width = 0;
sc_rover->owner = NULL;
new->next = sc_rover;
new->size = size;
} else
sc_rover = new->next;
new->width = width;
// DEBUG
if (width > 0)
new->height = (size - sizeof (*new) + sizeof (new->data)) / width;
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new->owner = NULL; // should be set properly after return
if (d_roverwrapped) {
if (wrapped_this_time || (sc_rover >= d_initial_rover))
r_cache_thrash = true;
} else if (wrapped_this_time) {
d_roverwrapped = true;
}
D_CheckCacheGuard (); // DEBUG
return new;
}
void
D_SCDump (void)
{
surfcache_t *test;
for (test = sc_base; test; test = test->next) {
if (test == sc_rover)
Sys_Printf ("ROVER:\n");
Sys_Printf ("%p : %i bytes %i width\n", test, test->size,
test->width);
}
}
// if the num is not a power of 2, assume it will not repeat
int
MaskForNum (int num)
{
if (num == 128)
return 127;
if (num == 64)
return 63;
if (num == 32)
return 31;
if (num == 16)
return 15;
return 255;
}
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int
D_log2 (int num)
{
int c;
c = 0;
while (num >>= 1)
c++;
return c;
}
surfcache_t *
D_CacheSurface (msurface_t *surface, int miplevel)
{
surfcache_t *cache;
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// if the surface is animating or flashing, flush the cache
r_drawsurf.texture = R_TextureAnimation (surface);
r_drawsurf.lightadj[0] = d_lightstylevalue[surface->styles[0]];
r_drawsurf.lightadj[1] = d_lightstylevalue[surface->styles[1]];
r_drawsurf.lightadj[2] = d_lightstylevalue[surface->styles[2]];
r_drawsurf.lightadj[3] = d_lightstylevalue[surface->styles[3]];
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// see if the cache holds apropriate data
cache = surface->cachespots[miplevel];
if (cache && !cache->dlight && surface->dlightframe != r_framecount
&& cache->texture == r_drawsurf.texture
&& cache->lightadj[0] == r_drawsurf.lightadj[0]
&& cache->lightadj[1] == r_drawsurf.lightadj[1]
&& cache->lightadj[2] == r_drawsurf.lightadj[2]
&& cache->lightadj[3] == r_drawsurf.lightadj[3])
return cache;
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// determine shape of surface
surfscale = 1.0 / (1 << miplevel);
r_drawsurf.surfmip = miplevel;
r_drawsurf.surfwidth = surface->extents[0] >> miplevel;
r_drawsurf.rowbytes = r_drawsurf.surfwidth;
r_drawsurf.surfheight = surface->extents[1] >> miplevel;
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// allocate memory if needed
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if (!cache) {
// if a texture just animated, don't reallocate it
cache = D_SCAlloc (r_drawsurf.surfwidth,
r_drawsurf.surfwidth * r_drawsurf.surfheight);
surface->cachespots[miplevel] = cache;
cache->owner = &surface->cachespots[miplevel];
cache->mipscale = surfscale;
}
if (surface->dlightframe == r_framecount)
cache->dlight = 1;
else
cache->dlight = 0;
r_drawsurf.surfdat = (byte *) cache->data;
cache->texture = r_drawsurf.texture;
cache->lightadj[0] = r_drawsurf.lightadj[0];
cache->lightadj[1] = r_drawsurf.lightadj[1];
cache->lightadj[2] = r_drawsurf.lightadj[2];
cache->lightadj[3] = r_drawsurf.lightadj[3];
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// draw and light the surface texture
r_drawsurf.surf = surface;
c_surf++;
R_DrawSurface ();
return surface->cachespots[miplevel];
}