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AllocBlock: cache index of last used lightmap, start search there

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Can speed up map loading by multiple seconds on levels with a lot of lightmaps, at a cost of using slightly more lightmaps (about 5% more).

https://sourceforge.net/p/quakespasm/patches/20/


git-svn-id: svn+ssh://svn.code.sf.net/p/quakespasm/code/trunk@956 af15c1b1-3010-417e-b628-4374ebc0bcbd
This commit is contained in:
ewasylishen 2014-08-05 18:22:58 +00:00
parent 7a02718fb9
commit accee1263e
1 changed files with 8 additions and 1 deletions
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9
quakespasm/Quake/r_brush.c
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@ -45,6 +45,7 @@ qboolean lightmap_modified[MAX_LIGHTMAPS];
glRect_t lightmap_rectchange[MAX_LIGHTMAPS];
int allocated[MAX_LIGHTMAPS][BLOCK_WIDTH];
int last_lightmap_allocated; //ericw -- optimization: remember the index of the last lightmap AllocBlock stored a surf in
// the lightmap texture data needs to be kept in
// main memory so texsubimage can update properly
@ -716,7 +717,12 @@ int AllocBlock (int w, int h, int *x, int *y)
int best, best2;
int texnum;
for (texnum=0 ; texnum<MAX_LIGHTMAPS ; texnum++)
// ericw -- rather than searching starting at lightmap 0 every time,
// start at the last lightmap we allocated a surface in.
// This makes AllocBlock much faster on large levels (can shave off 3+ seconds
// of load time on a level with 180 lightmaps), at a cost of not quite packing
// lightmaps as tightly vs. not doing this (uses ~5% more lightmaps)
for (texnum=last_lightmap_allocated ; texnum<MAX_LIGHTMAPS ; texnum++, last_lightmap_allocated++)
{
best = BLOCK_HEIGHT;
@ -865,6 +871,7 @@ void GL_BuildLightmaps (void)
qmodel_t *m;
memset (allocated, 0, sizeof(allocated));
last_lightmap_allocated = 0;
r_framecount = 1; // no dlightcache