#include "DrawParabol.h"

DrawParabol::DrawParabol(const ShaderClass *shader) : shader(shader)
{
    glGenVertexArrays(1, &this->VAO);
    glGenBuffers(1, &this->VBO);
}

DrawParabol::~DrawParabol()
{
    glDeleteVertexArrays(1, &this->VAO);
    glDeleteBuffers(1, &this->VBO);
}

void DrawParabol::clear() noexcept
{

}


void DrawParabol::init(std::vector<glm::vec3> & points) noexcept
{
    glBindVertexArray(this->VAO);
    glBindBuffer(GL_ARRAY_BUFFER, this->VBO);
    glBufferData(GL_ARRAY_BUFFER, points.size() * sizeof(glm::vec3), &points[0].x, GL_DYNAMIC_DRAW);
    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
    glEnableVertexAttribArray(0);
    glBindBuffer(GL_ARRAY_BUFFER, 0);

    glBindVertexArray(0);
    size = points.size();
}

void DrawParabol::draw() const noexcept
{
    this->shader->use();
    this->shader->setVec3("color", glm::vec3(10.0f, 0.0f, 0.0f)); //red one
    glBindVertexArray(VAO);
    glLineWidth(5.0f);
    glDrawArrays(GL_LINES, 0, this->size);
    glLineWidth(1.0f);
    glBindVertexArray(0);
}