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|
//! Defines usage types for memory bocks.
//! See `Usage` and implementations for details.
use crate::allocator::Kind;
/// Memory usage trait.
pub trait MemoryUsage: std::fmt::Debug {
/// Get set of properties required for the usage.
fn properties_required(&self) -> gfx_hal::memory::Properties;
/// Get comparable fitness value for memory properties.
///
/// # Panics
///
/// This function will panic if properties set doesn't contain required properties.
fn memory_fitness(&self, properties: gfx_hal::memory::Properties) -> u32;
/// Get comparable fitness value for memory allocator.
fn allocator_fitness(&self, kind: Kind) -> u32;
}
impl<T> MemoryUsage for T
where
T: std::ops::Deref + std::fmt::Debug,
T::Target: MemoryUsage,
{
fn properties_required(&self) -> gfx_hal::memory::Properties {
(&**self).properties_required()
}
fn memory_fitness(&self, properties: gfx_hal::memory::Properties) -> u32 {
(&**self).memory_fitness(properties)
}
fn allocator_fitness(&self, kind: Kind) -> u32 {
(&**self).allocator_fitness(kind)
}
}
/// Full speed GPU access.
/// Optimal for render targets and persistent resources.
/// Avoid memory with host access.
#[derive(Clone, Copy, Debug)]
pub struct Data;
impl MemoryUsage for Data {
fn properties_required(&self) -> gfx_hal::memory::Properties {
gfx_hal::memory::Properties::DEVICE_LOCAL
}
#[inline]
fn memory_fitness(&self, properties: gfx_hal::memory::Properties) -> u32 {
assert!(properties.contains(gfx_hal::memory::Properties::DEVICE_LOCAL));
0 | ((!properties.contains(gfx_hal::memory::Properties::CPU_VISIBLE)) as u32) << 3
| ((!properties.contains(gfx_hal::memory::Properties::LAZILY_ALLOCATED)) as u32) << 2
| ((!properties.contains(gfx_hal::memory::Properties::CPU_CACHED)) as u32) << 1
| ((!properties.contains(gfx_hal::memory::Properties::COHERENT)) as u32) << 0
}
fn allocator_fitness(&self, kind: Kind) -> u32 {
match kind {
Kind::Dedicated => 1,
Kind::Dynamic => 2,
Kind::Linear => 0,
}
}
}
/// CPU to GPU data flow with update commands.
/// Used for dynamic buffer data, typically constant buffers.
/// Host access is guaranteed.
/// Prefers memory with fast GPU access.
#[derive(Clone, Copy, Debug)]
pub struct Dynamic;
impl MemoryUsage for Dynamic {
fn properties_required(&self) -> gfx_hal::memory::Properties {
gfx_hal::memory::Properties::CPU_VISIBLE
}
#[inline]
fn memory_fitness(&self, properties: gfx_hal::memory::Properties) -> u32 {
assert!(properties.contains(gfx_hal::memory::Properties::CPU_VISIBLE));
assert!(!properties.contains(gfx_hal::memory::Properties::LAZILY_ALLOCATED));
0 | (properties.contains(gfx_hal::memory::Properties::DEVICE_LOCAL) as u32) << 2
| (properties.contains(gfx_hal::memory::Properties::COHERENT) as u32) << 1
| ((!properties.contains(gfx_hal::memory::Properties::CPU_CACHED)) as u32) << 0
}
fn allocator_fitness(&self, kind: Kind) -> u32 {
match kind {
Kind::Dedicated => 1,
Kind::Dynamic => 2,
Kind::Linear => 0,
}
}
}
/// CPU to GPU data flow with mapping.
/// Used for staging data before copying to the `Data` memory.
/// Host access is guaranteed.
#[derive(Clone, Copy, Debug)]
pub struct Upload;
impl MemoryUsage for Upload {
fn properties_required(&self) -> gfx_hal::memory::Properties {
gfx_hal::memory::Properties::CPU_VISIBLE
}
#[inline]
fn memory_fitness(&self, properties: gfx_hal::memory::Properties) -> u32 {
assert!(properties.contains(gfx_hal::memory::Properties::CPU_VISIBLE));
assert!(!properties.contains(gfx_hal::memory::Properties::LAZILY_ALLOCATED));
0 | ((!properties.contains(gfx_hal::memory::Properties::DEVICE_LOCAL)) as u32) << 2
| (properties.contains(gfx_hal::memory::Properties::COHERENT) as u32) << 1
| ((!properties.contains(gfx_hal::memory::Properties::CPU_CACHED)) as u32) << 0
}
fn allocator_fitness(&self, kind: Kind) -> u32 {
match kind {
Kind::Dedicated => 0,
Kind::Dynamic => 1,
Kind::Linear => 2,
}
}
}
/// GPU to CPU data flow with mapping.
/// Used for copying data from `Data` memory to be read by the host.
/// Host access is guaranteed.
#[derive(Clone, Copy, Debug)]
pub struct Download;
impl MemoryUsage for Download {
fn properties_required(&self) -> gfx_hal::memory::Properties {
gfx_hal::memory::Properties::CPU_VISIBLE
}
#[inline]
fn memory_fitness(&self, properties: gfx_hal::memory::Properties) -> u32 {
assert!(properties.contains(gfx_hal::memory::Properties::CPU_VISIBLE));
assert!(!properties.contains(gfx_hal::memory::Properties::LAZILY_ALLOCATED));
0 | ((!properties.contains(gfx_hal::memory::Properties::DEVICE_LOCAL)) as u32) << 2
| (properties.contains(gfx_hal::memory::Properties::CPU_CACHED) as u32) << 1
| (properties.contains(gfx_hal::memory::Properties::COHERENT) as u32) << 0
}
fn allocator_fitness(&self, kind: Kind) -> u32 {
match kind {
Kind::Dedicated => 0,
Kind::Dynamic => 1,
Kind::Linear => 2,
}
}
}
/// Well-known memory usage types.
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum MemoryUsageValue {
/// See [`Data`]
///
/// [`Data`]: struct.Data.html
Data,
/// See [`Dynamic`]
///
/// [`Dynamic`]: struct.Dynamic.html
Dynamic,
/// See [`Upload`]
///
/// [`Upload`]: struct.Upload.html
Upload,
/// See [`Download`]
///
/// [`Download`]: struct.Download.html
Download,
}
/// Memory usage trait.
impl MemoryUsage for MemoryUsageValue {
fn properties_required(&self) -> gfx_hal::memory::Properties {
match self {
MemoryUsageValue::Data => Data.properties_required(),
MemoryUsageValue::Dynamic => Dynamic.properties_required(),
MemoryUsageValue::Upload => Upload.properties_required(),
MemoryUsageValue::Download => Download.properties_required(),
}
}
fn memory_fitness(&self, properties: gfx_hal::memory::Properties) -> u32 {
match self {
MemoryUsageValue::Data => Data.memory_fitness(properties),
MemoryUsageValue::Dynamic => Dynamic.memory_fitness(properties),
MemoryUsageValue::Upload => Upload.memory_fitness(properties),
MemoryUsageValue::Download => Download.memory_fitness(properties),
}
}
fn allocator_fitness(&self, kind: Kind) -> u32 {
match self {
MemoryUsageValue::Data => Data.allocator_fitness(kind),
MemoryUsageValue::Dynamic => Dynamic.allocator_fitness(kind),
MemoryUsageValue::Upload => Upload.allocator_fitness(kind),
MemoryUsageValue::Download => Download.allocator_fitness(kind),
}
}
}
|
