DragonEngine/Mesh.cpp at master · Dartemiss/DragonEngine · GitHub

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#include "Mesh.h"
#include "GL/glew.h"

using namespace std;

Mesh::Mesh()
{
}

Mesh::Mesh(const vector<Vertex>& vertices, const vector<unsigned int>& indices)
{
	this->vertices = vertices;
	this->indices = indices;

	setupMesh();
}

Mesh::~Mesh()
{
	//TODO: why is this deleted 4719247194719847198 times
	glDeleteBuffers(1, &VAO);
	glDeleteBuffers(1, &VBO);
	glDeleteVertexArrays(1, &EBO);
}

void Mesh::setupMesh()
{
	glGenVertexArrays(1, &VAO);
	glGenBuffers(1, &VBO);
	glGenBuffers(1, &EBO);

	glBindVertexArray(VAO);
	glBindBuffer(GL_ARRAY_BUFFER, VBO);

	glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(Vertex), &vertices[0], GL_STATIC_DRAW);

	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
	glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(unsigned int),
		&indices[0], GL_STATIC_DRAW);

	// vertex positions
	glEnableVertexAttribArray(0);
	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)0);
	// vertex normals
	glEnableVertexAttribArray(1);
	glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, Normal));
	// vertex texture coords
	glEnableVertexAttribArray(2);
	glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, TexCoords));

	glBindVertexArray(0);
}

void Mesh::Draw(const unsigned int program) const
{
	glBindVertexArray(VAO);
	glDrawElements(GL_TRIANGLES, indices.size(), GL_UNSIGNED_INT, 0);
	glBindVertexArray(0);
	glActiveTexture(GL_TEXTURE0);
}