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bsp.cpp
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bsp.cpp
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#include <iostream>
#include <utility>
#include <string>
#include "bsp.h"
BSP ParseBSP(std::vector<unsigned char> buffer)
{
// Parse header
// DEBUG: display header
int header = CHARS_TO_I32(buffer, 0);
std::cout << "Header = " << header << std::endl;
std::vector<std::pair<int, int>> lumpData;
// Parse lumps offsets and lengths
for (int i = 0; i < Lumps::LUMPS_LENGTH; i++)
{
int offset = CHARS_TO_I32(buffer, (i * 8) + 4);
int lumpLength = CHARS_TO_I32(buffer, (i * 8) + 8);
lumpData.push_back({offset, lumpLength});
}
// DEBUG: Lump Data Display
for (int i = 0; i < lumpData.size(); i++)
{
int lumpType = i;
int offset = lumpData[i].first;
int length = lumpData[i].second;
std::cout << lumpType << ": " << offset << ", " << length << std::endl;
}
// Parse vertices
std::pair<int, int> vertexData = lumpData[Lumps::VERTICES];
std::vector<Vector3D> vertices;
for (int offset = 0; offset < vertexData.second; offset += sizeof(Vector3D))
{
Vector3D vertex;
memcpy(&vertex, &buffer[vertexData.first + offset], sizeof(vertex));
vertices.push_back(vertex);
}
// Parse edges
std::pair<int, int> edgeData = lumpData[Lumps::EDGES];
std::vector<std::pair<short, short>> edges;
for (int offset = 0; offset < edgeData.second; offset += 4)
{
short a = CHARS_TO_I16(buffer, offset);
short b = CHARS_TO_I16(buffer, offset + 2);
edges.push_back({a, b});
}
// Parse planes
std::pair<int, int> planeData = lumpData[Lumps::PLANES];
std::vector<Plane> planes;
for (int offset = 0; offset < planeData.second; offset += sizeof(Plane))
{
Plane plane;
memcpy(&plane, &buffer[planeData.first + offset], sizeof(plane));
planes.push_back(plane);
}
// Return bsp object
BSP bsp{vertices, edges, planes};
return bsp;
}