From 200188b3a4f5e7f4cd3b732cd0a6f7f825df7b37 Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <coelckers@users.noreply.github.com>
Date: Wed, 12 Dec 2018 00:34:37 +0100
Subject: [PATCH] - FHardwareTextureContainer.

This is essentially a stripped down version of FHardwareTexture, which can exist on the API independent size, and which stores pointers to hardware textures instead of OpenGL texture handles.
---
 src/hwrenderer/textures/hw_texcontainer.h | 123 ++++++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100644 src/hwrenderer/textures/hw_texcontainer.h

diff --git a/src/hwrenderer/textures/hw_texcontainer.h b/src/hwrenderer/textures/hw_texcontainer.h
new file mode 100644
index 000000000..d5836d82b
--- /dev/null
+++ b/src/hwrenderer/textures/hw_texcontainer.h
@@ -0,0 +1,123 @@
+#pragma once
+
+#include "tarray.h"
+
+struct FTextureBuffer;
+
+class FHardwareTextureContainer
+{
+public:
+	enum
+	{
+		MAX_TEXTURES = 16
+	};
+
+private:
+	struct TranslatedTexture
+	{
+		IHardwareTexture *hwTexture = nullptr;
+		int translation = 0;
+
+		void Delete()
+		{
+			if (hwTexture) delete hwTexture;
+			hwTexture = nullptr;
+		}
+		
+		~TranslatedTexture()
+		{
+			Delete();
+		}
+	};
+
+private:
+
+	TranslatedTexture hwDefTex[2];
+	TArray<TranslatedTexture> hwTex_Translated;
+	
+	TranslatedTexture * GetTexID(int translation, bool expanded)
+	{
+		translation = TranslationToIndex(translation);
+		if (translation == 0)
+		{
+			return &hwDefTex[expanded];
+		}
+
+		if (expanded) translation = -translation;
+		// normally there aren't more than very few different 
+		// translations here so this isn't performance critical.
+		unsigned index = hwTex_Translated.FindEx([=](auto &element)
+		{
+			return element.translation == translation;
+		}
+		if (index < hwTex_Translated.Size())
+		{
+			return &hwTex_Translated[i];
+		}
+
+		int add = hwTex_Translated.Reserve(1);
+		auto item = &hwTex_Translated[add];
+		item->translation = translation;
+		return item;
+	}
+
+public:
+
+	void Clean(bool all)
+	{
+		if (all) hwDefTex.Delete();
+		hwTex_Translated.Clear();
+			
+	}
+	
+	IHardwareTexture * GetHardwareTexture(int translation, bool expanded)
+	{
+		auto tt = GetTexID(translation, expanded);
+		return tt->hwTexture;
+	}
+	
+	void AddHardwareTexture(int translation, bool expanded, IHardwareTexture *tex)
+	{
+		auto tt = GetTexID(translation, expanded);
+		tt->Delete();
+		tt->hwTexture =tex;
+	}
+	
+	//===========================================================================
+	// 
+	// Deletes all allocated resources and considers translations
+	// This will only be called for sprites
+	//
+	//===========================================================================
+
+	void FHardwareTexture::CleanUnused(SpriteHits &usedtranslations, bool expanded)
+	{
+		if (usedtranslations.CheckKey(0) == nullptr)
+		{
+			hwDefTex[expanded].Delete();
+		}
+		for (int i = hwTex_Translated.Size()-1; i>= 0; i--)
+		{
+			if (usedtranslations.CheckKey(hwTex_Translated[i].translation) == nullptr)
+			{
+				hwTex_Translated.Delete(i);
+			}
+		}
+	}
+	
+	static int TranslationToIndex(int translation)
+	{
+		if (translation <= 0)
+		{
+			return -translation;
+		}
+		else
+		{
+			auto remap = TranslationToTable(translation);
+			return remap == nullptr ? 0 : remap->GetUniqueIndex();
+		}
+	}
+
+	
+};
+