#include "VertexArray.h"

VertexArray::VertexArray()

{

glGenVertexArrays(1, &m_RendererID);

}

VertexArray::~VertexArray()

{

glDeleteVertexArrays(1, &m_RendererID);

}

void VertexArray::AddBuffer(VertexBuffer& vb, const VertexBufferLayout& layout)

{

Bind();

vb.Bind();

this->vb = &vb;

const auto& elements = layout.GetElements();

unsigned int offset = 0;

for (int i = 0; i < elements.size(); i++)

{

const auto& element = elements[i];

glEnableVertexAttribArray(i);

glVertexAttribPointer(i, element.count, element.type, element.normalized, layout.GetStride(), (const void*)offset);

offset += element.count * element.GetSizeOfType(element.type);

}

UnBind();

}

void VertexArray::Bind() const

{

glBindVertexArray(m_RendererID);

}

void VertexArray::UnBind() const

{

glBindVertexArray(0);

}

void VertexArray::changeData(const void* data)

{

vb->changeData(data);

}