ref: 908e4541be46367384ab6290caddc936b3fdb5ca
dir: /d_surf.c/
// d_surf.c: rasterization driver surface heap manager
#include <u.h>
#include <libc.h>
#include <stdio.h>
#include "quakedef.h"
float surfscale;
qboolean r_cache_thrash; // set if surface cache is thrashing
int sc_size;
surfcache_t *sc_rover, *sc_base;
#define GUARDSIZE 4
int D_SurfaceCacheForRes (int width, int height)
{
int size, pix;
if (COM_CheckParm ("-surfcachesize"))
{
size = Q_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;
}
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");
}
void D_ClearCacheGuard (void)
{
byte *s;
int i;
s = (byte *)sc_base + sc_size;
for (i=0 ; i<GUARDSIZE ; i++)
s[i] = (byte)i;
}
/*
================
D_InitCaches
================
*/
void D_InitCaches (void *buffer, int size)
{
if (!msg_suppress_1)
Con_Printf ("%dk surface cache\n", size/1024);
sc_size = size - GUARDSIZE;
sc_base = (surfcache_t *)buffer;
sc_rover = sc_base;
sc_base->next = nil;
sc_base->owner = nil;
sc_base->size = sc_size;
D_ClearCacheGuard ();
}
/*
==================
D_FlushCaches
==================
*/
void D_FlushCaches (void)
{
surfcache_t *c;
if (!sc_base)
return;
for (c = sc_base ; c ; c = c->next)
{
if (c->owner)
*c->owner = nil;
}
sc_rover = sc_base;
sc_base->next = nil;
sc_base->owner = nil;
sc_base->size = sc_size;
}
/*
=================
D_SCAlloc
=================
*/
surfcache_t *D_SCAlloc (int width, uintptr size)
{
surfcache_t *new;
qboolean wrapped_this_time;
if ((width < 0) || (width > 256))
Sys_Error ("D_SCAlloc: bad cache width %d\n", width);
if ((size <= 0) || (size > 0x10000))
Sys_Error ("D_SCAlloc: bad cache size %d\n", size);
size = (uintptr)&((surfcache_t *)0)->data[size];
size = (size + 3) & ~3;
if (size > sc_size)
Sys_Error ("D_SCAlloc: %d > cache size",size);
// 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;
}
// colect and free surfcache_t blocks until the rover block is large enough
new = sc_rover;
if (sc_rover->owner)
*sc_rover->owner = nil;
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 = nil;
new->size += sc_rover->size;
new->next = sc_rover->next;
}
// 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 = nil;
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;
new->owner = nil; // 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;
}
/*
=================
D_SCDump
=================
*/
void D_SCDump (void)
{
surfcache_t *test;
for (test = sc_base ; test ; test = test->next)
{
if (test == sc_rover)
Sys_Printf ("ROVER:\n");
print ("%p : %d bytes %ud 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;
}
int D_log2 (int num)
{
int c;
c = 0;
while (num>>=1)
c++;
return c;
}
//=============================================================================
/*
================
D_CacheSurface
================
*/
surfcache_t *D_CacheSurface (msurface_t *surface, int miplevel)
{
surfcache_t *cache;
//
// if the surface is animating or flashing, flush the cache
//
r_drawsurf.texture = R_TextureAnimation (surface->texinfo->texture);
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]];
//
// 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;
//
// 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;
//
// allocate memory if needed
//
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 = (pixel_t *)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];
//
// draw and light the surface texture
//
r_drawsurf.surf = surface;
c_surf++;
R_DrawSurface ();
return surface->cachespots[miplevel];
}