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quake: cache files in memory to eliminate skips

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This caches large files (arbitrarily defined as >1MB) in memory, which
reduces the delay when a new model or sound is needed.

Change-Id: I0f96449555a32f05d771fe900c10eaf21ecbb4f6
This commit is contained in:
Franklin Wei 2019-07-27 16:07:07 -04:00
parent 42263152d4
commit feacbcd639
1 changed files with 103 additions and 38 deletions
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141
apps/plugins/sdl/progs/quake/sys_sdl.c
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@ -116,16 +116,25 @@ FILE IO
*/
#define MAX_HANDLES 10
static FILE *sys_handles[MAX_HANDLES];
//static FILE *sys_handles[MAX_HANDLES];
/* a file fully or partially cached in memory */
/* We use the FILE handle to track the current position */
static struct memfile {
FILE *f; /* NULL: unused slot */
char *buf;
size_t resident_len; /* bytes 0-(resident_len-1) are in memory */
size_t full_len;
} sys_handles[MAX_HANDLES];
void Sys_Shutdown(void)
{
for(int i = 0; i < MAX_HANDLES; i++)
{
FILE *f = sys_handles[i];
FILE *f = sys_handles[i].f;
if(f)
fclose(f);
sys_handles[i] = NULL;
sys_handles[i].f = NULL;
}
}
@ -134,7 +143,7 @@ int findhandle (void)
int i;
for (i=1 ; i<MAX_HANDLES ; i++)
if (!sys_handles[i])
if (!sys_handles[i].f)
return i;
Sys_Error ("out of handles");
return -1;
@ -158,26 +167,60 @@ static int Qfilelength (FILE *f)
return end;
}
#define CACHE_THRESHOLD (1024*1024)
/* really rough guesses */
#if MEMORYSIZE >= 64
#define MAX_CACHE (32*1024*1024)
#elif MEMORYSIZE >= 32
#define MAX_CACHE (20*1024*1024)
#else
#define MAX_CACHE 0
#endif
static int cache_left = MAX_CACHE;
int Sys_FileOpenRead (char *path, int *hndl)
{
FILE *f;
int i;
FILE *f;
int i;
i = findhandle ();
i = findhandle ();
f = fopen(path, "rb");
if (!f)
{
*hndl = -1;
return -1;
}
sys_handles[i] = f;
*hndl = i;
f = fopen(path, "rb");
if (!f)
{
*hndl = -1;
return -1;
}
sys_handles[i].f = f;
*hndl = i;
//rb->splashf(HZ*2, "Allocating handle %d to %s", i, path);
return Qfilelength(f);
//rb->splashf(HZ*2, "Allocating handle %d to %s", i, path);
int len = sys_handles[i].full_len = Qfilelength(f);
/* cache in memory? */
if(len > CACHE_THRESHOLD && cache_left > 0)
{
/* cache all or part of it */
int cachelen = (cache_left > len) ? len : cache_left;
if((sys_handles[i].buf = malloc(cachelen)))
{
cache_left -= cachelen;
/* fill in cache */
printf("Please wait... caching %d KB of large file", cachelen / 1024);
if(fread(sys_handles[i].buf, 1, cachelen, f) == cachelen)
{
sys_handles[i].resident_len = cachelen;
fseek(f, 0, SEEK_SET);
printf("Success!");
}
}
}
}
int Sys_FileOpenWrite (char *path)
@ -190,7 +233,7 @@ int Sys_FileOpenWrite (char *path)
f = fopen(path, "wb");
if (!f)
Sys_Error ("Error opening %s: %s", path,strerror(errno));
sys_handles[i] = f;
sys_handles[i].f = f;
return i;
}
@ -199,15 +242,19 @@ void Sys_FileClose (int handle)
{
if ( handle >= 0 ) {
//rb->splashf(HZ, "Close handle %d", handle);
fclose (sys_handles[handle]);
sys_handles[handle] = NULL;
fclose (sys_handles[handle].f);
cache_left += sys_handles[handle].resident_len;
// clear all fields so we can safely reuse
memset(sys_handles + handle, 0, sizeof(sys_handles[0]));
}
}
void Sys_FileSeek (int handle, int position)
{
if ( handle >= 0 ) {
fseek (sys_handles[handle], position, SEEK_SET);
fseek (sys_handles[handle].f, position, SEEK_SET);
}
}
@ -218,20 +265,38 @@ int Sys_FileRead (int handle, void *dst, int count)
size = 0;
if ( handle >= 0 ) {
data = dst;
while ( count > 0 ) {
done = fread (data, 1, count, sys_handles[handle]);
if ( done == 0 ) {
break;
}
else if(done < 0)
{
Sys_Error("stream error %d, file is %d = %d", done, handle, sys_handles[handle]);
}
data += done;
count -= done;
size += done;
}
FILE *f = sys_handles[handle].f;
data = dst;
/* partially or fully in memory */
int pos = ftell(f);
if(pos < sys_handles[handle].resident_len)
{
int memleft = sys_handles[handle].resident_len - pos;
int memlen = MIN(count, memleft);
memcpy(data, sys_handles[handle].buf + pos, memlen);
data += memlen;
count -= memlen;
size += memlen;
fseek(f, memlen, SEEK_CUR);
}
while ( count > 0 ) {
done = fread (data, 1, count, sys_handles[handle].f);
if ( done == 0 ) {
break;
}
else if(done < 0)
{
Sys_Error("stream error %d, file is %d = %d", done, handle, sys_handles[handle]);
}
data += done;
count -= done;
size += done;
}
}
return size;
@ -246,7 +311,7 @@ int Sys_FileWrite (int handle, void *src, int count)
if ( handle >= 0 ) {
data = src;
while ( count > 0 ) {
done = fread (data, 1, count, sys_handles[handle]);
done = fread (data, 1, count, sys_handles[handle].f);
if ( done == 0 ) {
break;
}