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// Copyright (C) 2019 Oscar Shrimpton
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
// You should have received a copy of the GNU General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>.
use std::marker::PhantomData;
use std::ops::{Index, IndexMut, Range};
use std::convert::TryInto;
use core::mem::{ManuallyDrop, size_of};
use hal::memory::{Pod, Properties, Requirements};
use hal::buffer::Usage;
use hal::adapter::MemoryTypeId;
use hal::{VertexCount, InstanceCount, Adapter, Device, PhysicalDevice, mapping};
use back::Backend;
use crate::error::CreationError;
use super::RenderingContext;
pub(crate) struct VertexLump<T: Into<X>, X: Pod> {
pub (crate) buffer: ManuallyDrop<<Backend as hal::Backend>::Buffer>,
memory: ManuallyDrop<<Backend as hal::Backend>::Memory>,
requirements: Requirements,
unit_size_bytes: u64,
unit_size_verts: u64,
batch_size: u64,
num_batches: usize,
/// An instance is active if it has been assigned to
pub active_instances: Range<InstanceCount>,
pub active_verts: Range<VertexCount>,
active: bool,
_t: PhantomData<T>,
_x: PhantomData<X>
}
const BATCH_SIZE: u64 = 3;
impl<T: Into<X>, X: Pod> VertexLump<T, X> {
pub fn new(device: &mut <Backend as hal::Backend>::Device, adapter: &Adapter<Backend>) -> Result<VertexLump<T, X>, CreationError> {
let unit_size_bytes = size_of::<X>() as u64;
let unit_size_verts = unit_size_bytes / size_of::<f32>() as u64;
let mut buffer = unsafe { device
.create_buffer(BATCH_SIZE * unit_size_bytes, Usage::VERTEX) }
.map_err(|e| CreationError::BufferError (e))?;
let requirements = unsafe { device.get_buffer_requirements(&buffer) };
let memory_type_id = adapter.physical_device
.memory_properties().memory_types
.iter().enumerate()
.find(|&(id, memory_type)| {
requirements.type_mask & (1 << id) != 0 && memory_type.properties.contains(Properties::CPU_VISIBLE)
})
.map(|(id, _)| MemoryTypeId(id))
.ok_or(CreationError::BufferNoMemory)?;
let memory = unsafe {device
.allocate_memory(memory_type_id, requirements.size) }
.map_err(|_| CreationError::OutOfMemoryError)?;
unsafe { device
.bind_buffer_memory(&memory, 0, &mut buffer) }
.map_err(|_| CreationError::BufferNoMemory)?;
Ok(VertexLump {
buffer: ManuallyDrop::new(buffer),
memory: ManuallyDrop::new(memory),
requirements,
active_verts: 0..0,
active_instances: 0..0,
num_batches: 1,
unit_size_bytes,
unit_size_verts,
batch_size: BATCH_SIZE, // TODO
active: true,
_t: PhantomData,
_x: PhantomData
})
}
pub fn set_active_instances(&mut self, range: Range<InstanceCount>) {
let count: u64 = (range.end - range.start).into();
let size_verts: u32 = (count * self.unit_size_verts).try_into().unwrap();
self.active_verts = range.start * size_verts..range.end * size_verts;
self.active_instances = range;
}
pub fn add(&mut self, tri: T, ctx: &mut RenderingContext) -> Result<(), ()> {
// figure out where to put it
let idx: usize = (self.active_instances.end).try_into().unwrap();
let batch_size: usize = self.batch_size.try_into().unwrap();
let max_size: usize = self.num_batches * batch_size;
// make sure correct size
if idx >= max_size {
self.num_batches += 1;
debug!("Reallocating Vertex buffer to {} batches ({} instances)", self.num_batches, self.num_batches as u64 * self.batch_size);
// get new buffer
let (new_buffer, new_requirements, new_memory) = {
let mut buffer = ManuallyDrop::new(unsafe { ctx.device
.create_buffer(self.batch_size * self.unit_size_bytes * self.num_batches as u64, Usage::VERTEX) }
.map_err(|_| ())?
);
let requirements = unsafe { ctx.device.get_buffer_requirements(&buffer) };
let memory_type_id = ctx.adapter.physical_device
.memory_properties().memory_types
.iter().enumerate()
.find(|&(id, memory_type)| {
requirements.type_mask & (1 << id) != 0 && memory_type.properties.contains(Properties::CPU_VISIBLE)
})
.map(|(id, _)| MemoryTypeId(id))
.ok_or(())?;
let memory = ManuallyDrop::new(unsafe { ctx.device
.allocate_memory(memory_type_id, requirements.size) }
.map_err(|_| ())?);
unsafe { ctx.device
.bind_buffer_memory(&memory, 0, &mut buffer) }
.map_err(|_| ())?;
(buffer, requirements, memory)
};
// copy vertices
unsafe {
let copy_range = 0..self.requirements.size;
trace!("Copying {:?} from old buffer to new buffer", copy_range);
let reader = ctx.device.acquire_mapping_reader::<u8>(&self.memory, copy_range.clone())
.map_err(|_| ())?;
let mut writer = ctx.device.acquire_mapping_writer::<u8>(&new_memory, copy_range.clone())
.map_err(|_| ())?;
let copy_range: Range<usize> = 0..self.requirements.size.try_into().unwrap();
writer[copy_range.clone()].copy_from_slice(&reader[copy_range.clone()]);
ctx.device.release_mapping_reader(reader);
ctx.device.release_mapping_writer(writer).map_err(|_| ())?;
};
// destroy old buffer
self.deactivate(ctx);
// use new one
self.buffer = new_buffer;
self.requirements = new_requirements;
self.memory = new_memory;
self.active = true;
}
{
// acquire writer
let mut writer = self.writer(ctx)?;
// write to it
writer[idx] = tri.into();
}
// activate new triangle
let new_range = self.active_instances.start..self.active_instances.end + 1;
self.set_active_instances(new_range);
Ok(())
}
pub(crate) fn writer<'a>(&'a mut self, ctx: &'a mut RenderingContext) -> Result<VertexWriter<'a, X>, ()> {
let mapping_writer = unsafe { ctx.device
.acquire_mapping_writer(&self.memory, 0..self.requirements.size)
.map_err(|_| ())? };
Ok(VertexWriter {
mapping_writer: ManuallyDrop::new(mapping_writer),
ctx
})
}
pub(crate) fn deactivate(&mut self, ctx: &mut RenderingContext) {
unsafe { ctx.device.free_memory(ManuallyDrop::take(&mut self.memory)) };
unsafe { ctx.device.destroy_buffer(ManuallyDrop::take(&mut self.buffer)) };
self.active = false;
}
}
pub struct VertexWriter<'a, X: Pod> {
mapping_writer: ManuallyDrop<mapping::Writer<'a, Backend, X>>,
ctx: &'a mut RenderingContext
}
impl<'a, X: Pod> Drop for VertexWriter<'a, X> {
fn drop(&mut self) {
unsafe {
self.ctx.device.release_mapping_writer(ManuallyDrop::take(&mut self.mapping_writer))
}.unwrap();
}
}
impl<'a, X: Pod> Index<usize> for VertexWriter<'a, X> {
type Output = X;
fn index(&self, index: usize) -> &Self::Output {
&self.mapping_writer[index]
}
}
impl<'a, X: Pod> IndexMut<usize> for VertexWriter<'a, X> {
fn index_mut(&mut self, index: usize) -> &mut Self::Output {
&mut self.mapping_writer[index]
}
}
impl<T: Into<X>, X: Pod> Drop for VertexLump<T, X> {
fn drop(&mut self) {
if self.active {
panic!("VertexLump dropped without being deactivated");
}
}
}
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