objloader.cpp

#include <vector>
#include <stdio.h>
#include <string>
#include <cstring>
#include <glm/glm.hpp>
#include "objloader.h"

// Very, VERY simple OBJ loader based on http://www.opengl-tutorial.org/beginners-tutorials/tutorial-7-model-loading/.

bool loadOBJ(
	const char * path,
	std::vector<glm::vec3> & out_vertices,
	std::vector<glm::vec3> & out_normals
) {
	printf("Loading OBJ file %s...\n", path);

	std::vector<unsigned int> vertexIndices, uvIndices, normalIndices;
	std::vector<glm::vec3> temp_vertices;
	std::vector<glm::vec3> temp_normals;

	FILE * file = fopen(path, "r");
	if (file == NULL) {
		printf("Impossible to open the file ! Are you in the right path ? See Tutorial 1 for details\n");
		getchar();
		return false;
	}

	while (1) {

		char lineHeader[128];
		// read the first word of the line
		int res = fscanf(file, "%s", lineHeader);
		if (res == EOF)
			break; // EOF = End Of File. Quit the loop.

				   // else : parse lineHeader

		if (strcmp(lineHeader, "v") == 0) {
			glm::vec3 vertex;
			fscanf(file, "%f %f %f\n", &vertex.x, &vertex.y, &vertex.z);
			temp_vertices.push_back(vertex);
		}
		else if (strcmp(lineHeader, "vn") == 0) {
			glm::vec3 normal;
			fscanf(file, "%f %f %f\n", &normal.x, &normal.y, &normal.z);
			temp_normals.push_back(normal);
		}
		else if (strcmp(lineHeader, "f") == 0) {
			std::string vertex1, vertex2, vertex3;
			unsigned int vertexIndex[3], uvIndex[3], normalIndex[3];
			int matches = fscanf(file, "%d//%d %d//%d %d//%d\n", &vertexIndex[0], &normalIndex[0], &vertexIndex[1], &normalIndex[1], &vertexIndex[2], &normalIndex[2]);
			if (matches != 6) {
				printf("File can't be read by our simple parser :-( Try exporting with other options\n");
				return false;
			}
			vertexIndices.push_back(vertexIndex[0]);
			vertexIndices.push_back(vertexIndex[1]);
			vertexIndices.push_back(vertexIndex[2]);
			normalIndices.push_back(normalIndex[0]);
			normalIndices.push_back(normalIndex[1]);
			normalIndices.push_back(normalIndex[2]);
		}
		else {
			// Probably a comment, eat up the rest of the line
			char stupidBuffer[1000];
			fgets(stupidBuffer, 1000, file);
		}

	}

	// For each vertex of each triangle
	for (unsigned int i = 0; i<vertexIndices.size(); i++) {

		// Get the indices of its attributes
		unsigned int vertexIndex = vertexIndices[i];
		unsigned int normalIndex = normalIndices[i];

		// Get the attributes thanks to the index
		glm::vec3 vertex = temp_vertices[vertexIndex - 1];
		glm::vec3 normal = temp_normals[normalIndex - 1];

		// Put the attributes in buffers
		out_vertices.push_back(vertex);
		out_normals.push_back(normal);

	}

	return true;
}

bool BB(const char * path, std::vector<glm::vec3> & out_vertices, glm::vec3 *minVec, glm::vec3 *maxVec) {

	printf("Loading OBJ file %s...\n", path);

	std::vector<unsigned int> vertexIndices, uvIndices;
	std::vector<glm::vec3> temp_vertices;

	FILE * file = fopen(path, "r");
	if (file == NULL) {
		printf("Impossible to open the file ! Are you in the right path ? See Tutorial 1 for details\n");
		getchar();
		return false;
	}

	while (1) {

		char lineHeader[128];
		// read the first word of the line
		int res = fscanf(file, "%s", lineHeader);
		if (res == EOF)
			break; // EOF = End Of File. Quit the loop.

				   // else : parse lineHeader

		if (strcmp(lineHeader, "v") == 0) {
			glm::vec3 vertex;
			fscanf(file, "%f %f %f\n", &vertex.x, &vertex.y, &vertex.z);
			temp_vertices.push_back(vertex);
		}
		else if (strcmp(lineHeader, "f") == 0) {
			std::string vertex1, vertex2, vertex3;
			unsigned int vertexIndex[3], uvIndex[3];
			int matches = fscanf(file, "%d//%d %d\n", &vertexIndex[0], &vertexIndex[1], &vertexIndex[2]);
			if (matches != 3) {
				printf("File can't be read by our simple parser :-( Try exporting with other options\n");
				return false;
			}
			vertexIndices.push_back(vertexIndex[0]);
			vertexIndices.push_back(vertexIndex[1]);
			vertexIndices.push_back(vertexIndex[2]);
		}
		else {
			// Probably a comment, eat up the rest of the line
			char stupidBuffer[1000];
			fgets(stupidBuffer, 1000, file);
		}

	}

	// For each vertex of each triangle
	for (unsigned int i = 0; i < vertexIndices.size(); i++) {

		// Get the indices of its attributes
		unsigned int vertexIndex = vertexIndices[i];
		// Get the attributes thanks to the index
		glm::vec3 vertex = temp_vertices[vertexIndex - 1];
		// Put the attributes in buffers
		out_vertices.push_back(vertex);

		if (vertex.x < minVec->x) {
			minVec->x = vertex.x;
		}
		else if (vertex.y < minVec->y) {
			minVec->y = vertex.y;
		}
		else if (vertex.z < minVec->z) {
			minVec->z = vertex.z;
		}

		else if (vertex.x < maxVec->x) {
			maxVec->x = vertex.x;
		}
		else if (vertex.y < maxVec->y) {
			maxVec->y = vertex.y;
		}
		else if (vertex.z < maxVec->z) {
			maxVec->z = vertex.z;
		}
	}
}