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- add thread safety to GetSpecialLights

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This commit is contained in:
Magnus Norddahl 2017-03-16 17:53:12 +01:00
parent b529b1e3a7
commit f1b03b48e9
1 changed files with 24 additions and 4 deletions
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28
src/swrenderer/r_swcolormaps.cpp
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@ -70,12 +70,16 @@ TArray<FSWColormap> SpecialSWColormaps;
//
//==========================================================================
FDynamicColormap *GetSpecialLights (PalEntry color, PalEntry fade, int desaturate)
static FDynamicColormap *CreateSpecialLights (PalEntry color, PalEntry fade, int desaturate)
{
FDynamicColormap *colormap;
// GetSpecialLights is called by the scene worker threads.
// If we didn't find the colormap, search again, but this time one thread at a time
static std::mutex buildmapmutex;
std::unique_lock<std::mutex> lock(buildmapmutex);
// If this colormap has already been created, just return it
for (colormap = &NormalLight; colormap != NULL; colormap = colormap->Next)
// This may happen if another thread beat us to it
for (FDynamicColormap *colormap = &NormalLight; colormap != NULL; colormap = colormap->Next)
{
if (color == colormap->Color &&
fade == colormap->Fade &&
@ -86,7 +90,7 @@ FDynamicColormap *GetSpecialLights (PalEntry color, PalEntry fade, int desaturat
}
// Not found. Create it.
colormap = new FDynamicColormap;
FDynamicColormap *colormap = new FDynamicColormap;
colormap->Next = NormalLight.Next;
colormap->Color = color;
colormap->Fade = fade;
@ -98,6 +102,22 @@ FDynamicColormap *GetSpecialLights (PalEntry color, PalEntry fade, int desaturat
return colormap;
}
FDynamicColormap *GetSpecialLights (PalEntry color, PalEntry fade, int desaturate)
{
// If this colormap has already been created, just return it
for (FDynamicColormap *colormap = &NormalLight; colormap != NULL; colormap = colormap->Next)
{
if (color == colormap->Color &&
fade == colormap->Fade &&
desaturate == colormap->Desaturate)
{
return colormap;
}
}
return CreateSpecialLights(color, fade, desaturate);
}
//==========================================================================
//
// Free all lights created with GetSpecialLights