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use std::mem::size_of;
use crate::opengl::currently_bound::CurrentlyBound;
use crate::opengl::vertex_buffer::VertexBuffer;
use crate::vertex::{Attribute, AttributeComponentType, Vertex};
const VERTEX_STRIDE: usize = size_of::<Vertex>();
#[derive(Debug)]
pub struct VertexArray
{
array: gl::types::GLuint,
}
impl VertexArray
{
pub fn new() -> Self
{
let mut array = 0;
unsafe {
gl::GenVertexArrays(1, &mut array);
}
Self { array }
}
/// Draws the currently bound vertex array.
pub fn draw(
_currently_bound: &CurrentlyBound<Self>,
primitive_kind: PrimitiveKind,
start_index: u32,
index_cnt: u32,
)
{
unsafe {
#[allow(clippy::cast_possible_wrap)]
gl::DrawArrays(
primitive_kind.into_gl(),
start_index as gl::types::GLint,
index_cnt as gl::types::GLsizei,
);
}
}
pub fn configure_attrs(
_currently_bound: &CurrentlyBound<Self>,
_vert_buf_curr_bound: &CurrentlyBound<VertexBuffer>,
)
{
let mut offset = 0;
for attr in Vertex::attrs() {
Self::vertex_attrib_ptr(attr, offset);
Self::enable_vertex_attrib_array(attr.index);
offset += attr.component_size * attr.component_cnt as usize;
}
}
#[allow(clippy::inline_always)]
#[inline(always)]
pub fn bind(&self, cb: impl FnOnce(CurrentlyBound<'_, Self>))
{
unsafe { gl::BindVertexArray(self.array) }
// SAFETY: A vertex array object is currently bound
let currently_bound = unsafe { CurrentlyBound::new() };
cb(currently_bound);
}
fn vertex_attrib_ptr(vertex_attr: &Attribute, offset: usize)
{
unsafe {
#[allow(clippy::cast_possible_wrap, clippy::cast_possible_truncation)]
gl::VertexAttribPointer(
vertex_attr.index as gl::types::GLuint,
vertex_attr.component_cnt as i32,
Self::vertex_attr_type_to_gl(&vertex_attr.component_type),
gl::FALSE,
VERTEX_STRIDE as gl::types::GLsizei,
offset as *const _,
);
}
}
fn enable_vertex_attrib_array(index: usize)
{
unsafe {
#[allow(clippy::cast_possible_truncation)]
gl::EnableVertexAttribArray(index as gl::types::GLuint);
}
}
fn vertex_attr_type_to_gl(
vertex_attr_type: &AttributeComponentType,
) -> gl::types::GLenum
{
match vertex_attr_type {
AttributeComponentType::Float => gl::FLOAT,
}
}
}
impl Drop for VertexArray
{
fn drop(&mut self)
{
unsafe {
gl::DeleteVertexArrays(1, &self.array);
}
}
}
#[derive(Debug)]
pub enum PrimitiveKind
{
Triangles,
}
impl PrimitiveKind
{
fn into_gl(self) -> gl::types::GLenum
{
match self {
Self::Triangles => gl::TRIANGLES,
}
}
}
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