Implement terrain file reading to generate navmeshes in the future (#703)

* Implement terrain file reading to generate navmeshes in the future

* Make Emo's suggested changes.

dNavigation/dTerrain/RawFile.cpp

@@ -0,0 +1,82 @@
+#include "RawFile.h"
+
+#include "BinaryIO.h"
+#include "RawChunk.h"
+#include "RawMesh.h"
+#include "RawHeightMap.h"
+
+RawFile::RawFile(std::string fileName) {
+	if (!BinaryIO::DoesFileExist(fileName)) return;
+
+	std::ifstream file(fileName, std::ios::binary);
+
+	// Read header
+
+	BinaryIO::BinaryRead(file, m_Version);
+	BinaryIO::BinaryRead(file, m_Padding);
+	BinaryIO::BinaryRead(file, m_ChunkCount);
+	BinaryIO::BinaryRead(file, m_Width);
+	BinaryIO::BinaryRead(file, m_Height);
+
+
+	if (m_Version < 0x20) {
+		return; // Version too crusty to handle
+	}
+
+	// Read in chunks
+
+	m_Chunks = {};
+
+	for (uint32_t i = 0; i < m_ChunkCount; i++) {
+		RawChunk* chunk = new RawChunk(file);
+		m_Chunks.push_back(chunk);
+	}
+
+	this->GenerateFinalMeshFromChunks();
+}
+
+RawFile::~RawFile() {
+	delete m_FinalMesh;
+	for (const auto* item : m_Chunks) {
+		delete item;
+	}
+}
+
+void RawFile::GenerateFinalMeshFromChunks() {
+	uint32_t lenOfLastChunk = 0; // index of last vert set in the last chunk
+
+	for (const auto& chunk : m_Chunks) {
+		for (const auto& vert : chunk->m_Mesh->m_Vertices) {
+			auto tempVert = vert;
+
+			tempVert.SetX(tempVert.GetX() + (chunk->m_X / 4));
+			tempVert.SetZ(tempVert.GetZ() + (chunk->m_Z / 4));
+
+			tempVert* chunk->m_HeightMap->m_ScaleFactor;
+
+			m_FinalMesh->m_Vertices.push_back(tempVert);
+		}
+
+		for (const auto& tri : chunk->m_Mesh->m_Triangles) {
+			m_FinalMesh->m_Triangles.push_back(tri + lenOfLastChunk);
+		}
+
+		lenOfLastChunk += chunk->m_Mesh->m_Vertices.size();
+	}
+}
+
+void RawFile::WriteFinalMeshToOBJ(std::string path) {
+	std::ofstream file(path);
+	std::string vertData;
+
+	for (const auto& v : m_FinalMesh->m_Vertices) {
+		vertData += "v " + std::to_string(v.x) + " " + std::to_string(v.y) + " " + std::to_string(v.z) + "\n";
+	}
+
+	for (int i = 0; i < m_FinalMesh->m_Triangles.size(); i += 3) {
+		vertData += "f " + std::to_string(*std::next(m_FinalMesh->m_Triangles.begin(), i) + 1) + " " + std::to_string(*std::next(m_FinalMesh->m_Triangles.begin(), i + 1) + 1) + " " + std::to_string(*std::next(m_FinalMesh->m_Triangles.begin(), i + 2) + 1) + "\n";
+	}
+
+	file.write(vertData.c_str(), vertData.size());
+	file.close();
+}