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//! # easy-opengl
//!
//! `easy-opengl` is a collection of utilities to make opengl app
//! more quickly and easy without losing custumization and freedom
//! # Example
//! ``` rust
//!extern crate gl;
//!extern crate sdl2;
//!
//!use easy_opengl::buffers::*;
//!use easy_opengl::shader::*;
//!use easy_opengl::textures::*;
//!
//!use sdl2::event::Event;
//!use sdl2::event::WindowEvent;
//!
//!const SCR_WIDTH: u32 = 800;
//!const SCR_HEIGHT: u32 = 600;
//!
//!const VERTEX_SHADER_SOURCE: &str = r#"
//! #version 330 core
//! layout (location = 0) in vec3 aPos;
//! layout (location = 1) in vec2 aTexCoord;
//!
//! out vec2 TexCoord;
//!
//! void main() {
//! gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);
//! TexCoord = aTexCoord;
//! }
//!"#;
//!
//!const FRAGMENT_SHADER_SOURCE: &str = r#"
//! #version 330 core
//! out vec4 FragColor;
//! in vec2 TexCoord;
//!
//! uniform sampler2D texture1;
//! uniform vec4 color;
//!
//! void main() {
//! FragColor = texture(texture1, TexCoord) * color;
//! }
//!"#;
//!
//!pub struct Window {
//! pub sdl_context: sdl2::Sdl,
//! pub sdl_window: sdl2::video::Window,
//! pub gl_context: sdl2::video::GLContext,
//! pub event_pump: sdl2::EventPump,
//! pub name: String,
//! pub width: u32,
//! pub height: u32,
//!}
//!
//!impl Window {
//! pub fn new(width: u32, height: u32, name: String) -> Self {
//! let sdl_context = sdl2::init().unwrap();
//! let video_subsystem = sdl_context.video().unwrap();
//!
//! let window = video_subsystem
//! .window("Titulo", width.clone(), height.clone())
//! .opengl()
//! .resizable()
//! .build()
//! .unwrap();
//!
//! let gl_context = window.gl_create_context().unwrap();
//! gl::load_with(|name| video_subsystem.gl_get_proc_address(name) as *const std::ffi::c_void);
//! let mut event_pump = sdl_context.event_pump().unwrap();
//!
//! Self {
//! sdl_context,
//! sdl_window: window,
//! gl_context,
//! event_pump,
//! width,
//! height,
//! name,
//! }
//! }
//!}
//!
//!pub fn main() {
//! let mut window = Window::new(SCR_WIDTH, SCR_HEIGHT, "Test".to_string());
//! let mut shader = Shader::new();
//! shader.load_from_memory(VERTEX_SHADER_SOURCE, FRAGMENT_SHADER_SOURCE, None);
//!
//! let vertices = vec![
//! 0.5, 0.5, 0.0, 1.0, 1.0, // top right
//! 0.5, -0.5, 0.0, 1.0, 0.0, // bottom right
//! -0.5, -0.5, 0.0, 0.0, 0.0, // bottom left
//! -0.5, 0.5, 0.0, 0.0, 1.0, // top left
//! ];
//! let indices = vec![
//! 0, 1, 3, // first Triangle
//! 1, 2, 3, // second Triangle
//! ];
//!
//! let vao = VertexArray::new();
//! // Is important keep alive the variable, because when is out of scope it will destroy the buffer
//! let _vbo = VertexBuffer::new(calc_bytes_size(&vertices) as isize, Some(&vertices));
//!
//! vao.bind();
//!
//! submit_vertex_attribs(&mut vec![
//! VertexAttrib::new(VertexAttribType::Float3, false, "aPos".to_string()),
//! VertexAttrib::new(VertexAttribType::Float2, false, "aTexCoord".to_string()),
//! ]);
//!
//! // Is important keep alive the variable, because when is out of scope it will destroy the buffer
//! let _ibo = IndexBuffer::new(calc_bytes_size(&indices) as isize, Some(&indices));
//!
//! let mut texture = Texture2D::new();
//! texture.load_from_file("./a.png", TextureConfig::new());
//!
//! 'main: loop {
//! window.sdl_window.gl_swap_window();
//! for event in window.event_pump.poll_iter() {
//! unsafe {
//! gl::ClearColor(0.1, 0.1, 0.1, 1.0);
//! gl::Clear(gl::COLOR_BUFFER_BIT);
//! texture.bind();
//! shader.bind();
//! shader.set_uniform("color", UniformType::Fv4(1.0, 0.4, 0.1, 1.0));
//! vao.bind();
//! gl::DrawElements(
//! gl::TRIANGLES,
//! indices.len() as i32,
//! gl::UNSIGNED_INT,
//! std::ptr::null(),
//! );
//! }
//! match event {
//! Event::Quit { .. } => {
//! break 'main;
//! }
//! Event::Window {
//! timestamp,
//! window_id,
//! win_event,
//! } => match win_event {
//! WindowEvent::Resized(w, h) => unsafe {
//! gl::Viewport(0, 0, w, h);
//! },
//! _ => {}
//! },
//! _ => {}
//! }
//! }
//! // ::std::thread::sleep(::std::time::Duration::new(0, 1_000_000_000u32 / 60));
//! }
//!}
//! ```