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use crate::graphics::{
GLCore,
core::GLError,
core::buffer::{
BufferTarget,
BufferIndexedTarget,
BufferUsage,
},
};
use core::{
marker::PhantomData,
mem::{
size_of,
MaybeUninit
},
};
pub struct Buffer<I:Sized>{
id:u32,
marker:PhantomData<*const I>,
}
impl<I:Sized> Buffer<I>{
/// Creates a buffer without memory allocation.
pub fn generate()->Buffer<I>{
unsafe{
let mut id:u32=MaybeUninit::uninit().assume_init();
GLCore.buffer.generate_one(&mut id);
Self{
id,
marker:PhantomData,
}
}
}
/// Returns the identifier of a buffer.
#[inline(always)]
pub fn id(&self)->u32{
self.id
}
}
impl<I:Sized> Buffer<I>{
/// Binds a buffer to the specified target.
///
/// Returns `GLError::NoError` if no error has accured.
///
/// Returns `GLError::InvalidValue` is generated
/// if `buffer` is not a name previously returned from a call to `Buffer::generate()`.
pub fn bind(&self,target:BufferTarget)->GLError{
unsafe{
GLCore.buffer.bind(target,self.id);
GLCore.get_error()
}
}
/// Binds the zero-named buffer object.
///
/// Returns `GLError::NoError` if no error has accured.
///
///
#[inline(always)]
pub fn unbind(target:BufferTarget)->GLError{
unsafe{
GLCore.buffer.bind(target,0);
GLCore.get_error()
}
}
/// Binds a buffer to the specified binding with the specified target.
///
/// Returns `GLError::NoError` if no error has accured.
///
/// `GLError::InvalidValue` is generated
/// if `buffer` is not a name previously returned from a call to `Buffer::generate()`,
/// if `index` is greater than or equal to the number of target-specific indexed binding points,
/// if buffer does not have an associated data store, or if the size of that store is zero.
#[inline(always)]
pub fn bind_base(&self,target:BufferIndexedTarget,index:u32)->GLError{
unsafe{
GLCore.buffer.bind_base(target,index,self.id);
GLCore.get_error()
}
}
/// Binds a buffer to the specified binding with the specified target and buffer range.
///
/// Returns `GLError::NoError` if no error has accured.
#[inline(always)]
pub fn bind_range(&self,target:BufferIndexedTarget,index:u32,start:isize,count:isize)->GLError{
unsafe{
GLCore.buffer.bind_range(target,index,self.id,start,count);
GLCore.get_error()
}
}
}
impl<I:Sized> Buffer<I>{
/// Updates a subset of a buffer object's data store.
///
/// `size` is the number of bytes.
///
/// `GLError::InvalidValue` is generated
/// if `offset` or `size` is negative,
/// or if together they define a region of memory
/// that extends beyond the buffer object's allocated data store.
///
/// `GLError::InvalidOperation` is generated
/// if the reserved buffer object name 0 is bound to `target`,
/// or if the buffer object being updated is mapped.
pub fn write_raw(target:BufferTarget,offset:isize,size:isize,data:&I)->GLError{
unsafe{
GLCore.buffer.write(target,offset,size,data);
GLCore.get_error()
}
}
/// Updates a subset of a buffer object's data store.
///
/// `GLError::InvalidValue` is generated
/// if `offset` is negative,
/// or if `offset` and the size of data define a region of memory
/// that extends beyond the buffer object's allocated data store.
///
/// `GLError::InvalidOperation` is generated
/// if the reserved buffer object name 0 is bound to `target`,
/// or if the buffer object being updated is mapped.
pub fn write(target:BufferTarget,offset:isize,data:&[I])->GLError{
unsafe{
let offset=size_of::<I>() as isize*offset;
let size=size_of::<I>()*data.len();
let data=&*data.as_ptr();
GLCore.buffer.write::<I>(target,offset,size as isize,data);
GLCore.get_error()
}
}
/// Creates and initializes a buffer object's data store.
///
/// `size` is the number of bytes.
///
/// Returns `GLError::NoError` if no error has accured.
///
/// Returns `GLError::InvalidValue` if `size` is negative.
///
/// Returns `GLError::InvalidOperation` if the reserved buffer object name 0 is bound to target.
///
/// Returns `GLError::OutOfMemory` if the GL is unable to create a data store with the specified size.
pub fn rewrite_raw(target:BufferTarget,size:isize,data:Option<&I>,usage:BufferUsage)->GLError{
unsafe{
GLCore.buffer.rewrite(target,size,data,usage);
GLCore.get_error()
}
}
/// Creates and initializes a buffer object's data store.
///
/// Returns `GLError::NoError` if no error has accured.
///
/// Returns `GLError::InvalidOperation` if the reserved buffer object name 0 is bound to target.
///
/// Returns `GLError::OutOfMemory` if the GL is unable to create a data store with the specified size.
pub fn rewrite(target:BufferTarget,data:&[I],usage:BufferUsage)->GLError{
unsafe{
let size=size_of::<I>()*data.len();
let data=&*data.as_ptr();
GLCore.buffer.rewrite::<I>(target,size as isize,Some(data),usage);
GLCore.get_error()
}
}
/// Creates an uninitialized buffer object's data store.
///
/// `size` is the number of items.
///
/// Returns `GLError::NoError` if no error has accured.
///
/// Returns `GLError::InvalidValue` if `size` is negative.
///
/// Returns `GLError::InvalidOperation` if the reserved buffer object name 0 is bound to target.
///
/// Returns `GLError::OutOfMemory` if the GL is unable to create a data store with the specified size.
pub fn rewrite_empty(target:BufferTarget,size:isize,usage:BufferUsage)->GLError{
unsafe{
GLCore.buffer.rewrite::<I>(target,size*size_of::<I>() as isize,None,usage);
GLCore.get_error()
}
}
}
impl<I:Sized> Drop for Buffer<I>{
fn drop(&mut self){
unsafe{
GLCore.buffer.delete_one(&self.id);
}
}
}