cat_engine_basement 0.0.0-alpha7

The CatEnigne's basement
Documentation 
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use crate::graphics::{
    core::GLError,
    core::buffer::{
        BufferTarget,
        BufferIndexedTarget,
        BufferUsage,
    },
    level0::Buffer,
};

use core::mem::size_of;

pub struct UniformBuffer<U:Sized>{
    buffer:Buffer<U>,
}

impl<U:Sized> UniformBuffer<U>{
    #[inline(always)]
    pub fn generate()->UniformBuffer<U>{
        Self{
            buffer:Buffer::generate(),
        }
    }

    #[inline(always)]
    pub unsafe fn raw(buffer:Buffer<U>)->UniformBuffer<U>{
        Self{
            buffer,
        }
    }

    pub fn new(uniform:&U,usage:BufferUsage)->Result<UniformBuffer<U>,GLError>{
        let buffer=UniformBuffer::generate();
        let result=buffer.rewrite(uniform,usage);
        if result.is_error(){
            Err(result)
        }
        else{
            Ok(buffer)
        }
    }

    pub fn empty(usage:BufferUsage)->Result<UniformBuffer<U>,GLError>{
        let buffer=UniformBuffer::generate();
        let result=buffer.rewrite_empty(usage);
        if result.is_error(){
            Err(result)
        }
        else{
            Ok(buffer)
        }
    }

    #[inline(always)]
    pub fn as_raw(&self)->&Buffer<U>{
        &self.buffer
    }

    #[inline(always)]
    pub fn into_raw(self)->Buffer<U>{
        self.buffer
    }

    #[inline(always)]
    pub fn bind(&self)->GLError{
        self.buffer.bind(BufferTarget::UniformBuffer)
    }

    #[inline(always)]
    pub fn bind_base(&self,binding_index:u32)->GLError{
        self.buffer.bind_base(BufferIndexedTarget::UniformBuffer,binding_index)
    }

    #[inline(always)]
    pub fn bind_range(&self,binding_index:u32,offset:isize,size:isize)->GLError{
        self.buffer.bind_range(BufferIndexedTarget::UniformBuffer,binding_index,offset,size)
    }

    pub fn write(&self,uniform:&U)->GLError{
        let result=self.bind();
        if result.is_error(){
            result
        }
        else{
            Buffer::write_raw(BufferTarget::UniformBuffer,0,size_of::<U>() as isize,uniform)
        }
    }

    pub fn rewrite(&self,uniform:&U,usage:BufferUsage)->GLError{
        let result=self.bind();
        if result.is_error(){
            result
        }
        else{
            Buffer::rewrite_raw(BufferTarget::UniformBuffer,size_of::<U>() as isize,Some(uniform),usage)
        }
    }

    pub fn rewrite_empty(&self,usage:BufferUsage)->GLError{
        let result=self.bind();
        if result.is_error(){
            result
        }
        else{
            Buffer::<U>::rewrite_empty(BufferTarget::UniformBuffer,1,usage)
        }
    }
}

// Unicorn - why not?
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