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use std::mem::size_of;
use crate::opengl::buffer::Buffer;
#[derive(Debug)]
pub struct VertexArray
{
array: gl::types::GLuint,
}
impl VertexArray
{
pub fn new() -> Self
{
let mut array = 0;
unsafe {
gl::CreateVertexArrays(1, &mut array);
}
Self { array }
}
/// Draws the currently bound vertex array.
pub fn draw_arrays(primitive_kind: PrimitiveKind, start_index: u32, cnt: u32)
{
unsafe {
#[allow(clippy::cast_possible_wrap)]
gl::DrawArrays(
primitive_kind.into_gl(),
start_index as gl::types::GLint,
cnt as gl::types::GLsizei,
);
}
}
/// Draws the currently bound vertex array.
pub fn draw_elements(primitive_kind: PrimitiveKind, offset: u32, cnt: u32)
{
unsafe {
#[allow(clippy::cast_possible_wrap)]
gl::DrawElements(
primitive_kind.into_gl(),
cnt as gl::types::GLsizei,
gl::UNSIGNED_INT,
(offset as gl::types::GLint) as *const _,
);
}
}
pub fn bind_element_buffer(&mut self, element_buffer: &Buffer<u32>)
{
unsafe {
gl::VertexArrayElementBuffer(self.array, element_buffer.object());
}
}
pub fn bind_vertex_buffer<VertexT>(
&mut self,
binding_index: u32,
vertex_buffer: &Buffer<VertexT>,
offset: isize,
)
{
unsafe {
gl::VertexArrayVertexBuffer(
self.array,
binding_index,
vertex_buffer.object(),
offset,
size_of::<VertexT>() as i32,
);
}
}
pub fn enable_attrib(&mut self, attrib_index: u32)
{
unsafe {
gl::EnableVertexArrayAttrib(self.array, attrib_index as gl::types::GLuint);
}
}
pub fn set_attrib_format(
&mut self,
attrib_index: u32,
data_type: DataType,
normalized: bool,
offset: u32,
)
{
unsafe {
#[allow(clippy::cast_possible_wrap)]
gl::VertexArrayAttribFormat(
self.array,
attrib_index,
data_type.size() as gl::types::GLint,
data_type as u32,
if normalized { gl::TRUE } else { gl::FALSE },
offset,
);
}
}
/// Associate a vertex attribute and a vertex buffer binding.
pub fn set_attrib_vertex_buf_binding(
&mut self,
attrib_index: u32,
vertex_buf_binding_index: u32,
)
{
unsafe {
gl::VertexArrayAttribBinding(
self.array,
attrib_index,
vertex_buf_binding_index,
);
}
}
pub fn bind(&self)
{
unsafe { gl::BindVertexArray(self.array) }
}
}
#[derive(Debug)]
pub enum PrimitiveKind
{
Triangles,
}
impl PrimitiveKind
{
fn into_gl(self) -> gl::types::GLenum
{
match self {
Self::Triangles => gl::TRIANGLES,
}
}
}
#[derive(Debug, Clone, Copy)]
#[repr(u32)]
pub enum DataType
{
Float = gl::FLOAT,
}
impl DataType
{
pub fn size(self) -> u32
{
#[allow(clippy::cast_possible_truncation)]
match self {
Self::Float => size_of::<gl::types::GLfloat>() as u32,
}
}
}
|
