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OpenGL: Improve logic when bitmap cache memory is exhausted. 

Don't remove the front entry, as it will likely be needed for the next bitmap.
Instead, implement neuristics based on access times.
This commit is contained in:
Alex Shvartzkop 2023-10-24 03:36:51 +03:00
parent ccc29e9776
commit 71d0c7f6af
1 changed files with 44 additions and 16 deletions
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60
common/gal/opengl/opengl_gal.cpp
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@ -95,9 +95,10 @@ public:
private:
struct CACHED_BITMAP
{
GLuint id;
int w, h;
size_t size;
GLuint id;
int w, h;
size_t size;
long long int accessTime;
};
GLuint cacheBitmap( const BITMAP_BASE* aBitmap );
@ -106,9 +107,9 @@ private:
const size_t m_cacheMaxSize = 256 * 1024 * 1024;
std::map<const KIID, CACHED_BITMAP> m_bitmaps;
std::list<KIID> m_cacheLru;
size_t m_cacheSize;
std::list<GLuint> m_freedTextureIds;
std::list<KIID> m_cacheLru;
size_t m_cacheSize;
std::list<GLuint> m_freedTextureIds;
};
}; // namespace KIGFX
@ -131,6 +132,7 @@ GLuint GL_BITMAP_CACHE::RequestBitmap( const BITMAP_BASE* aBitmap )
// A bitmap is found in cache bitmap. Ensure the associated texture is still valid.
if( glIsTexture( it->second.id ) )
{
it->second.accessTime = wxGetUTCTimeMillis().GetValue();
return it->second.id;
}
else
@ -244,26 +246,52 @@ GLuint GL_BITMAP_CACHE::cacheBitmap( const BITMAP_BASE* aBitmap )
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
long long currentTime = wxGetUTCTimeMillis().GetValue();
bmp.id = textureID;
bmp.accessTime = currentTime;
#ifndef DISABLE_BITMAP_CACHE
m_cacheLru.emplace_back( aBitmap->GetImageID() );
m_cacheSize += bmp.size;
m_bitmaps.emplace( aBitmap->GetImageID(), std::move( bmp ) );
if( m_cacheLru.size() > m_cacheMaxElements
|| m_cacheSize > m_cacheMaxSize )
if( m_cacheLru.size() + 1 > m_cacheMaxElements || m_cacheSize + bmp.size > m_cacheMaxSize )
{
KIID last = m_cacheLru.front();
CACHED_BITMAP& cachedBitmap = m_bitmaps[last];
KIID toRemove( 0 );
auto toRemoveLru = m_cacheLru.end();
// Remove entries accessed > 1s ago first
for( const auto& [kiid, bmp] : m_bitmaps )
{
const int cacheTimeoutMillis = 1000L;
if( currentTime - bmp.accessTime > cacheTimeoutMillis )
{
toRemove = kiid;
toRemoveLru = std::find( m_cacheLru.begin(), m_cacheLru.end(), toRemove );
break;
}
}
// Otherwise, remove the latest entry (it's less likely to be needed soon)
if( toRemove == niluuid )
{
toRemoveLru = m_cacheLru.end();
toRemoveLru--;
toRemove = *toRemoveLru;
}
CACHED_BITMAP& cachedBitmap = m_bitmaps[toRemove];
m_cacheSize -= cachedBitmap.size;
glDeleteTextures( 1, &cachedBitmap.id );
m_freedTextureIds.emplace_back( cachedBitmap.id );
m_bitmaps.erase( last );
m_cacheLru.pop_front();
m_bitmaps.erase( toRemove );
m_cacheLru.erase( toRemoveLru );
}
m_cacheLru.emplace_back( aBitmap->GetImageID() );
m_cacheSize += bmp.size;
m_bitmaps.emplace( aBitmap->GetImageID(), std::move( bmp ) );
#endif
return textureID;