#include "VertexBuffer.h"

VertexBuffer::VertexBuffer() {
    glGenVertexArrays(1, &vertex_array);
    glGenBuffers(1, &vertex_buffer);
}

void VertexBuffer::set_data(unsigned int size, const void *data, int flag) {
    this->size = size;

    glBindVertexArray(vertex_array);
    glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer);

    glBufferData(GL_ARRAY_BUFFER, size, data, flag);

    // TODO: Generalize
    // This tells that the data consists of 2xfloat packets
    glEnableVertexAttribArray(0);
    glVertexAttribPointer(0, 2, GL_FLOAT, false, 2 * sizeof(float), 0);

    glBindVertexArray(0);
}

void VertexBuffer::bind() {
    glBindVertexArray(vertex_array);
}

void VertexBuffer::draw() {
    bind();
    glDrawArrays(GL_TRIANGLES, 0, size);
}