From 4ce3f3771459ae40b06dabada0e088c4c2552017 Mon Sep 17 00:00:00 2001
From: Ian Brown <bigianb@gmail.com>
Date: Tue, 23 Mar 2021 00:05:58 +0000
Subject: [PATCH] texture chunks

---
 CuttownTest/gameData.cpp |  2 +-
 snowlib/World.cpp        |  2 +-
 snowlib/World.h          |  4 ++++
 snowlib/WorldReader.cpp  | 27 +++++++++++++++++++++++++++
 snowlib/WorldReader.h    |  7 +++++++
 5 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/CuttownTest/gameData.cpp b/CuttownTest/gameData.cpp
index 1b0a15a..ba532ff 100644
--- a/CuttownTest/gameData.cpp
+++ b/CuttownTest/gameData.cpp
@@ -44,7 +44,7 @@ void GameData::read(QString rootDir, QString worldName)
 		gobName = worldName.toUpper() + ".GOB";
 		QString gobFile = lmpDir + "/" + gobName;
 		worldGob = new GobFile(gobFile.toStdString(), gameType);
-		world = WorldReader().readWorld(worldGob, worldName.toLower().toStdString().c_str());
+		world = WorldReader(gameType).readWorld(worldGob, worldName.toLower().toStdString().c_str());
 	}
 }
 
diff --git a/snowlib/World.cpp b/snowlib/World.cpp
index d72f981..5d1a870 100644
--- a/snowlib/World.cpp
+++ b/snowlib/World.cpp
@@ -1,6 +1,6 @@
 #include "World.h"
 
-World::World()
+World::World() : textureChunkOffsets(100*100, 0)
 {
 	topoStartCol = 0;
 	topoStartRow = 0;
diff --git a/snowlib/World.h b/snowlib/World.h
index b32a93c..f757540 100644
--- a/snowlib/World.h
+++ b/snowlib/World.h
@@ -60,4 +60,8 @@ public:
 	// All of the topo patches. This collection owns the patches.
 	std::vector<TopoPatch*> topoPatches;
 
+	// The texture chunk offsets. 2D array with a 100 x 100 dimension.
+	std::vector<int> textureChunkOffsets;
+
+	void setTextureChunkOffset(int x, int y, int addr) { textureChunkOffsets.at(y * 100 + x) = addr; }
 };
diff --git a/snowlib/WorldReader.cpp b/snowlib/WorldReader.cpp
index d77f50b..b24d153 100644
--- a/snowlib/WorldReader.cpp
+++ b/snowlib/WorldReader.cpp
@@ -50,6 +50,33 @@ void WorldReader::decodeWorldFile(World* world, const unsigned char* data, int d
 	int offset68 = DataUtil::getLEInt(data, 0x68);
 	int worldTexOffsetsOffset = DataUtil::getLEInt(data, 0x6C);
 
+	readTextureChunkOffsets(world, data, dataLength, worldTexOffsetsOffset, texMinx, texMiny, texMaxx+1, texMaxy);
+}
+
+void WorldReader::readTextureChunkOffsets(World* world, const unsigned char* data, int dataLength, int worldTexOffsetsOffset, int texMinx, int texMiny, int texMaxx, int texMaxy)
+{
+	for (int y = texMiny; y <= texMaxy; ++y)
+	{
+		for (int x = texMinx; x <= texMaxx; ++x)
+		{
+			int cellOffset = ((y - texMiny) * 100 + x - texMinx) * 8;
+			// This test is needed to deal with town.world in BGDA which addresses textures outside of the maximum x range.
+			if (dataLength >=  cellOffset + 4)
+			{
+				int addr;
+				if (GameType::CHAMPIONS_RTA == gameType || GameType::JL_HEROES == gameType)
+				{
+					// TODO: Figure out what this should really be
+					addr = 0x800;
+				}
+				else
+				{
+					addr = DataUtil::getLEInt(data, cellOffset);
+				}
+				world->setTextureChunkOffset(x, y, addr);
+			}
+		}
+	}
 }
 
 void WorldReader::decodeTopography(World* world, const unsigned char* data, int dataLength)
diff --git a/snowlib/WorldReader.h b/snowlib/WorldReader.h
index 7fdf46e..3163ae3 100644
--- a/snowlib/WorldReader.h
+++ b/snowlib/WorldReader.h
@@ -1,5 +1,7 @@
 #pragma once
 
+#include "GameType.h"
+
 class World;
 class LmpRepository;
 class TopoPatch;
@@ -7,10 +9,15 @@ class TopoPatch;
 class WorldReader
 {
 public:
+	WorldReader(GameType gameType) : gameType(gameType) {}
 	World* readWorld(LmpRepository* lmpRepository, const char* name);
 
 private:
+	GameType gameType;
+
 	void decodeWorldFile(World* world, const unsigned char* data, int dataLength);
 	void decodeTopography(World* world, const unsigned char* data, int dataLength);
 	TopoPatch* readTopoPatch(const unsigned char* data, int offset);
+	void readTextureChunkOffsets(World* world, const unsigned char* data, int dataLength, int worldTexOffsetsOffset, int texMinx, int texMiny, int texMaxx, int texMaxy);
+
 };
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