private VectorInt3?AllocateTexture(RenderingTexture texture)
{
if (texture.To.X < texture.From.X || texture.To.Y < texture.From.Y)
{
throw new ArgumentOutOfRangeException(); // Avoid totally currupted texture allocator state.
}
for (int i = 0; i < Pages.Length; ++i)
{
VectorInt2?allocatedPos = Pages[i].Packer.TryAdd(VectorInt2.Max((texture.To - texture.From) + new VectorInt2(2), VectorInt2.One));
if (allocatedPos != null)
{
VectorInt3 pos = new VectorInt3(allocatedPos.Value.X, allocatedPos.Value.Y, i);
if (texture.To.X == texture.From.X || texture.To.Y == texture.From.Y)
{
UploadTexture(ImageC.CreateNew(1, 1), pos); // Attempt to handle this situation
}
else
{
UploadTexture(texture, pos);
}
AvailableTextures.Add(texture, pos + new VectorInt3(1, 1, 0));
return(pos + new VectorInt3(1, 1, 0));
}
}
return(null);
}
private VectorInt3 UpdateQuickAccess(ref RenderingTexture texture, VectorInt3 result)
{
if (LastUsedTextureIndex == 0)
{
QuickAccessTexture1 = new KeyValuePair <RenderingTexture, VectorInt3>(texture, result);
LastUsedTextureIndex = 1;
}
else
{
QuickAccessTexture0 = new KeyValuePair <RenderingTexture, VectorInt3>(texture, result);
LastUsedTextureIndex = 0;
}
return(result);
}
/// <summary>
/// RemoveUser must be called after the rendering texture is no longer used.
/// </summary>
public VectorInt3 Get(RenderingTexture texture)
{
// Check if it's the last used texture.
// This speeds up the common case because oftentimes similar textures are used often
if (texture == QuickAccessTexture0.Key)
{
LastUsedTextureIndex = 0;
return(QuickAccessTexture0.Value);
}
if (texture == QuickAccessTexture1.Key)
{
LastUsedTextureIndex = 1;
return(QuickAccessTexture1.Value);
}
// Look texture up in dictionary
VectorInt3 result;
if (AvailableTextures.TryGetValue(texture, out result))
{
return(UpdateQuickAccess(ref texture, result));
}
// Add texture
VectorInt3?result2 = AllocateTexture(texture);
if (result2.HasValue)
{
return(UpdateQuickAccess(ref texture, result2.Value));
}
if (!GarbageCollect())
{
return(new VectorInt3()); // Garbage collection failed and we have already established that there is not enough space as it is.
}
VectorInt3?result3 = AllocateTexture(texture); // Garbage collection succeeded, let's try again
if (result3.HasValue)
{
return(UpdateQuickAccess(ref texture, result3.Value));
}
return(new VectorInt3()); // Still not enough space but there is nothing we can do about it.
}
protected abstract void UploadTexture(RenderingTexture Texture, VectorInt3 pos);
internal Entry(KeyValuePair <RenderingTexture, VectorInt3> availableTexture)
{
Texture = availableTexture.Key;
Pos = availableTexture.Value;
}
