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adapter.rs
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adapter.rs
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use metal::{MTLFeatureSet, MTLGPUFamily, MTLLanguageVersion, MTLReadWriteTextureTier};
use objc::{class, msg_send, sel, sel_impl};
use parking_lot::Mutex;
use wgt::{AstcBlock, AstcChannel};
use std::{sync::Arc, thread};
use super::TimestampQuerySupport;
const MAX_COMMAND_BUFFERS: u64 = 2048;
unsafe impl Send for super::Adapter {}
unsafe impl Sync for super::Adapter {}
impl super::Adapter {
pub(super) fn new(shared: Arc<super::AdapterShared>) -> Self {
Self { shared }
}
}
impl crate::Adapter for super::Adapter {
type A = super::Api;
unsafe fn open(
&self,
features: wgt::Features,
_limits: &wgt::Limits,
_memory_hints: &wgt::MemoryHints,
) -> Result<crate::OpenDevice<super::Api>, crate::DeviceError> {
let queue = self
.shared
.device
.lock()
.new_command_queue_with_max_command_buffer_count(MAX_COMMAND_BUFFERS);
// Acquiring the meaning of timestamp ticks is hard with Metal!
// The only thing there is is a method correlating cpu & gpu timestamps (`device.sample_timestamps`).
// Users are supposed to call this method twice and calculate the difference,
// see "Converting GPU Timestamps into CPU Time":
// https://developer.apple.com/documentation/metal/gpu_counters_and_counter_sample_buffers/converting_gpu_timestamps_into_cpu_time
// Not only does this mean we get an approximate value, this is as also *very slow*!
// Chromium opted to solve this using a linear regression that they stop at some point
// https://source.chromium.org/chromium/chromium/src/+/refs/heads/main:third_party/dawn/src/dawn/native/metal/DeviceMTL.mm;drc=76be2f9f117654f3fe4faa477b0445114fccedda;bpv=0;bpt=1;l=46
// Generally, the assumption is that timestamp values aren't changing over time, after all all other APIs provide stable values.
//
// We should do as Chromium does for the general case, but this requires quite some state tracking
// and doesn't even provide perfectly accurate values, especially at the start of the application when
// we didn't have the chance to sample a lot of values just yet.
//
// So instead, we're doing the dangerous but easy thing and use our "knowledge" of timestamps
// conversions on different devices, after all Metal isn't supported on that many ;)
// Based on:
// * https://github.com/gfx-rs/wgpu/pull/2528
// * https://github.com/gpuweb/gpuweb/issues/1325#issuecomment-761041326
let timestamp_period = if self.shared.device.lock().name().starts_with("Intel") {
83.333
} else {
// Known for Apple Silicon (at least M1 & M2, iPad Pro 2018) and AMD GPUs.
1.0
};
Ok(crate::OpenDevice {
device: super::Device {
shared: Arc::clone(&self.shared),
features,
counters: Default::default(),
},
queue: super::Queue {
raw: Arc::new(Mutex::new(queue)),
timestamp_period,
},
})
}
unsafe fn texture_format_capabilities(
&self,
format: wgt::TextureFormat,
) -> crate::TextureFormatCapabilities {
use crate::TextureFormatCapabilities as Tfc;
use wgt::TextureFormat as Tf;
let pc = &self.shared.private_caps;
// Affected formats documented at:
// https://developer.apple.com/documentation/metal/mtlreadwritetexturetier/mtlreadwritetexturetier1?language=objc
// https://developer.apple.com/documentation/metal/mtlreadwritetexturetier/mtlreadwritetexturetier2?language=objc
let (read_write_tier1_if, read_write_tier2_if) = match pc.read_write_texture_tier {
MTLReadWriteTextureTier::TierNone => (Tfc::empty(), Tfc::empty()),
MTLReadWriteTextureTier::Tier1 => (Tfc::STORAGE_READ_WRITE, Tfc::empty()),
MTLReadWriteTextureTier::Tier2 => (Tfc::STORAGE_READ_WRITE, Tfc::STORAGE_READ_WRITE),
};
let msaa_count = pc.sample_count_mask;
let msaa_resolve_desktop_if = if pc.msaa_desktop {
Tfc::MULTISAMPLE_RESOLVE
} else {
Tfc::empty()
};
let msaa_resolve_apple3x_if = if pc.msaa_desktop | pc.msaa_apple3 {
Tfc::MULTISAMPLE_RESOLVE
} else {
Tfc::empty()
};
let is_not_apple1x = super::PrivateCapabilities::supports_any(
self.shared.device.lock().as_ref(),
&[
MTLFeatureSet::iOS_GPUFamily2_v1,
MTLFeatureSet::macOS_GPUFamily1_v1,
MTLFeatureSet::tvOS_GPUFamily1_v1,
],
);
// Metal defined pixel format capabilities
let all_caps = Tfc::SAMPLED_LINEAR
| Tfc::STORAGE
| Tfc::COLOR_ATTACHMENT
| Tfc::COLOR_ATTACHMENT_BLEND
| msaa_count
| Tfc::MULTISAMPLE_RESOLVE;
let extra = match format {
Tf::R8Unorm | Tf::R16Float | Tf::Rgba8Unorm | Tf::Rgba16Float => {
read_write_tier2_if | all_caps
}
Tf::R8Snorm | Tf::Rg8Snorm | Tf::Rgba8Snorm => {
let mut flags = all_caps;
flags.set(Tfc::MULTISAMPLE_RESOLVE, is_not_apple1x);
flags
}
Tf::R8Uint
| Tf::R8Sint
| Tf::R16Uint
| Tf::R16Sint
| Tf::Rgba8Uint
| Tf::Rgba8Sint
| Tf::Rgba16Uint
| Tf::Rgba16Sint => {
read_write_tier2_if | Tfc::STORAGE | Tfc::COLOR_ATTACHMENT | msaa_count
}
Tf::R16Unorm
| Tf::R16Snorm
| Tf::Rg16Unorm
| Tf::Rg16Snorm
| Tf::Rgba16Unorm
| Tf::Rgba16Snorm => {
Tfc::SAMPLED_LINEAR
| Tfc::STORAGE
| Tfc::COLOR_ATTACHMENT
| Tfc::COLOR_ATTACHMENT_BLEND
| msaa_count
| msaa_resolve_desktop_if
}
Tf::Rg8Unorm | Tf::Rg16Float | Tf::Bgra8Unorm => all_caps,
Tf::Rg8Uint | Tf::Rg8Sint => Tfc::STORAGE | Tfc::COLOR_ATTACHMENT | msaa_count,
Tf::R32Uint | Tf::R32Sint => {
read_write_tier1_if | Tfc::STORAGE | Tfc::COLOR_ATTACHMENT | msaa_count
}
Tf::R32Float => {
let flags = if pc.format_r32float_all {
all_caps
} else {
Tfc::STORAGE | Tfc::COLOR_ATTACHMENT | Tfc::COLOR_ATTACHMENT_BLEND | msaa_count
};
read_write_tier1_if | flags
}
Tf::Rg16Uint | Tf::Rg16Sint => Tfc::STORAGE | Tfc::COLOR_ATTACHMENT | msaa_count,
Tf::Rgba8UnormSrgb | Tf::Bgra8UnormSrgb => {
let mut flags = all_caps;
flags.set(Tfc::STORAGE, pc.format_rgba8_srgb_all);
flags
}
Tf::Rgb10a2Uint => {
let mut flags = Tfc::COLOR_ATTACHMENT | msaa_count;
flags.set(Tfc::STORAGE, pc.format_rgb10a2_uint_write);
flags
}
Tf::Rgb10a2Unorm => {
let mut flags = all_caps;
flags.set(Tfc::STORAGE, pc.format_rgb10a2_unorm_all);
flags
}
Tf::Rg11b10Ufloat => {
let mut flags = all_caps;
flags.set(Tfc::STORAGE, pc.format_rg11b10_all);
flags
}
Tf::Rg32Uint | Tf::Rg32Sint => Tfc::COLOR_ATTACHMENT | Tfc::STORAGE | msaa_count,
Tf::Rg32Float => {
if pc.format_rg32float_all {
all_caps
} else {
Tfc::STORAGE | Tfc::COLOR_ATTACHMENT | Tfc::COLOR_ATTACHMENT_BLEND | msaa_count
}
}
Tf::Rgba32Uint | Tf::Rgba32Sint => {
read_write_tier2_if | Tfc::STORAGE | Tfc::COLOR_ATTACHMENT | msaa_count
}
Tf::Rgba32Float => {
let mut flags = read_write_tier2_if | Tfc::STORAGE | Tfc::COLOR_ATTACHMENT;
if pc.format_rgba32float_all {
flags |= all_caps
} else if pc.msaa_apple7 {
flags |= msaa_count
};
flags
}
Tf::Stencil8 => {
all_caps | Tfc::DEPTH_STENCIL_ATTACHMENT | msaa_count | msaa_resolve_apple3x_if
}
Tf::Depth16Unorm => {
let mut flags =
Tfc::DEPTH_STENCIL_ATTACHMENT | msaa_count | msaa_resolve_apple3x_if;
if pc.format_depth16unorm {
flags |= Tfc::SAMPLED_LINEAR
}
flags
}
Tf::Depth32Float | Tf::Depth32FloatStencil8 => {
let mut flags =
Tfc::DEPTH_STENCIL_ATTACHMENT | msaa_count | msaa_resolve_apple3x_if;
if pc.format_depth32float_filter {
flags |= Tfc::SAMPLED_LINEAR
}
flags
}
Tf::Depth24Plus | Tf::Depth24PlusStencil8 => {
let mut flags = Tfc::DEPTH_STENCIL_ATTACHMENT | msaa_count;
if pc.format_depth24_stencil8 {
flags |= Tfc::SAMPLED_LINEAR | Tfc::MULTISAMPLE_RESOLVE
} else {
flags |= msaa_resolve_apple3x_if;
if pc.format_depth32float_filter {
flags |= Tfc::SAMPLED_LINEAR
}
}
flags
}
Tf::NV12 => return Tfc::empty(),
Tf::Rgb9e5Ufloat => {
if pc.msaa_apple3 {
all_caps
} else if pc.msaa_desktop {
Tfc::SAMPLED_LINEAR
} else {
Tfc::SAMPLED_LINEAR
| Tfc::COLOR_ATTACHMENT
| Tfc::COLOR_ATTACHMENT_BLEND
| msaa_count
| Tfc::MULTISAMPLE_RESOLVE
}
}
Tf::Bc1RgbaUnorm
| Tf::Bc1RgbaUnormSrgb
| Tf::Bc2RgbaUnorm
| Tf::Bc2RgbaUnormSrgb
| Tf::Bc3RgbaUnorm
| Tf::Bc3RgbaUnormSrgb
| Tf::Bc4RUnorm
| Tf::Bc4RSnorm
| Tf::Bc5RgUnorm
| Tf::Bc5RgSnorm
| Tf::Bc6hRgbUfloat
| Tf::Bc6hRgbFloat
| Tf::Bc7RgbaUnorm
| Tf::Bc7RgbaUnormSrgb => {
if pc.format_bc {
Tfc::SAMPLED_LINEAR
} else {
Tfc::empty()
}
}
Tf::Etc2Rgb8Unorm
| Tf::Etc2Rgb8UnormSrgb
| Tf::Etc2Rgb8A1Unorm
| Tf::Etc2Rgb8A1UnormSrgb
| Tf::Etc2Rgba8Unorm
| Tf::Etc2Rgba8UnormSrgb
| Tf::EacR11Unorm
| Tf::EacR11Snorm
| Tf::EacRg11Unorm
| Tf::EacRg11Snorm => {
if pc.format_eac_etc {
Tfc::SAMPLED_LINEAR
} else {
Tfc::empty()
}
}
Tf::Astc {
block: _,
channel: _,
} => {
if pc.format_astc || pc.format_astc_hdr {
Tfc::SAMPLED_LINEAR
} else {
Tfc::empty()
}
}
};
Tfc::COPY_SRC | Tfc::COPY_DST | Tfc::SAMPLED | extra
}
unsafe fn surface_capabilities(
&self,
surface: &super::Surface,
) -> Option<crate::SurfaceCapabilities> {
let current_extent = if surface.main_thread_id == thread::current().id() {
Some(surface.dimensions())
} else {
log::warn!("Unable to get the current view dimensions on a non-main thread");
None
};
let mut formats = vec![
wgt::TextureFormat::Bgra8Unorm,
wgt::TextureFormat::Bgra8UnormSrgb,
wgt::TextureFormat::Rgba16Float,
];
if self.shared.private_caps.format_rgb10a2_unorm_all {
formats.push(wgt::TextureFormat::Rgb10a2Unorm);
}
let pc = &self.shared.private_caps;
Some(crate::SurfaceCapabilities {
formats,
// We use this here to govern the maximum number of drawables + 1.
// See https://developer.apple.com/documentation/quartzcore/cametallayer/2938720-maximumdrawablecount
maximum_frame_latency: if pc.can_set_maximum_drawables_count {
1..=2
} else {
// 3 is the default value for maximum drawables in `CAMetalLayer` documentation
// iOS 10.3 was tested to use 3 on iphone5s
2..=2
},
present_modes: if pc.can_set_display_sync {
vec![wgt::PresentMode::Fifo, wgt::PresentMode::Immediate]
} else {
vec![wgt::PresentMode::Fifo]
},
composite_alpha_modes: vec![
wgt::CompositeAlphaMode::Opaque,
wgt::CompositeAlphaMode::PostMultiplied,
],
current_extent,
usage: crate::TextureUses::COLOR_TARGET
| crate::TextureUses::COPY_SRC
| crate::TextureUses::COPY_DST,
})
}
unsafe fn get_presentation_timestamp(&self) -> wgt::PresentationTimestamp {
let timestamp = self.shared.presentation_timer.get_timestamp_ns();
wgt::PresentationTimestamp(timestamp)
}
}
const RESOURCE_HEAP_SUPPORT: &[MTLFeatureSet] = &[
MTLFeatureSet::iOS_GPUFamily1_v3,
MTLFeatureSet::tvOS_GPUFamily1_v2,
MTLFeatureSet::macOS_GPUFamily1_v3,
];
const ARGUMENT_BUFFER_SUPPORT: &[MTLFeatureSet] = &[
MTLFeatureSet::iOS_GPUFamily1_v4,
MTLFeatureSet::tvOS_GPUFamily1_v3,
MTLFeatureSet::macOS_GPUFamily1_v3,
];
const MUTABLE_COMPARISON_SAMPLER_SUPPORT: &[MTLFeatureSet] = &[
MTLFeatureSet::iOS_GPUFamily3_v1,
MTLFeatureSet::macOS_GPUFamily1_v1,
];
const SAMPLER_CLAMP_TO_BORDER_SUPPORT: &[MTLFeatureSet] = &[MTLFeatureSet::macOS_GPUFamily1_v2];
const ASTC_PIXEL_FORMAT_FEATURES: &[MTLFeatureSet] = &[
MTLFeatureSet::iOS_GPUFamily2_v1,
MTLFeatureSet::tvOS_GPUFamily1_v1,
];
const ANY8_UNORM_SRGB_ALL: &[MTLFeatureSet] = &[
MTLFeatureSet::iOS_GPUFamily2_v3,
MTLFeatureSet::tvOS_GPUFamily1_v2,
];
const ANY8_SNORM_RESOLVE: &[MTLFeatureSet] = &[
MTLFeatureSet::iOS_GPUFamily2_v1,
MTLFeatureSet::tvOS_GPUFamily1_v1,
MTLFeatureSet::macOS_GPUFamily1_v1,
];
const RGBA8_SRGB: &[MTLFeatureSet] = &[
MTLFeatureSet::iOS_GPUFamily2_v3,
MTLFeatureSet::tvOS_GPUFamily1_v2,
];
const RGB10A2UNORM_ALL: &[MTLFeatureSet] = &[
MTLFeatureSet::iOS_GPUFamily3_v1,
MTLFeatureSet::tvOS_GPUFamily2_v1,
MTLFeatureSet::macOS_GPUFamily1_v1,
];
const RGB10A2UINT_WRITE: &[MTLFeatureSet] = &[
MTLFeatureSet::iOS_GPUFamily3_v1,
MTLFeatureSet::tvOS_GPUFamily2_v1,
MTLFeatureSet::macOS_GPUFamily1_v1,
];
const RG11B10FLOAT_ALL: &[MTLFeatureSet] = &[
MTLFeatureSet::iOS_GPUFamily3_v1,
MTLFeatureSet::tvOS_GPUFamily2_v1,
MTLFeatureSet::macOS_GPUFamily1_v1,
];
const RGB9E5FLOAT_ALL: &[MTLFeatureSet] = &[
MTLFeatureSet::iOS_GPUFamily3_v1,
MTLFeatureSet::tvOS_GPUFamily2_v1,
];
const BGR10A2_ALL: &[MTLFeatureSet] = &[
MTLFeatureSet::iOS_GPUFamily1_v4,
MTLFeatureSet::tvOS_GPUFamily1_v3,
MTLFeatureSet::macOS_GPUFamily2_v1,
];
/// "Indirect draw & dispatch arguments" in the Metal feature set tables
const INDIRECT_DRAW_DISPATCH_SUPPORT: &[MTLFeatureSet] = &[
MTLFeatureSet::iOS_GPUFamily3_v1,
MTLFeatureSet::tvOS_GPUFamily2_v1,
MTLFeatureSet::macOS_GPUFamily1_v1,
];
/// "Base vertex/instance drawing" in the Metal feature set tables
///
/// in our terms, `base_vertex` and `first_instance` must be 0
const BASE_VERTEX_FIRST_INSTANCE_SUPPORT: &[MTLFeatureSet] = INDIRECT_DRAW_DISPATCH_SUPPORT;
const TEXTURE_CUBE_ARRAY_SUPPORT: &[MTLFeatureSet] = &[
MTLFeatureSet::iOS_GPUFamily4_v1,
MTLFeatureSet::tvOS_GPUFamily1_v2,
MTLFeatureSet::macOS_GPUFamily1_v1,
];
const DUAL_SOURCE_BLEND_SUPPORT: &[MTLFeatureSet] = &[
MTLFeatureSet::iOS_GPUFamily1_v4,
MTLFeatureSet::tvOS_GPUFamily1_v3,
MTLFeatureSet::macOS_GPUFamily1_v2,
];
const LAYERED_RENDERING_SUPPORT: &[MTLFeatureSet] = &[
MTLFeatureSet::iOS_GPUFamily5_v1,
MTLFeatureSet::macOS_GPUFamily1_v1,
MTLFeatureSet::macOS_GPUFamily2_v1,
];
const FUNCTION_SPECIALIZATION_SUPPORT: &[MTLFeatureSet] = &[
MTLFeatureSet::iOS_GPUFamily1_v3,
MTLFeatureSet::tvOS_GPUFamily1_v2,
MTLFeatureSet::macOS_GPUFamily1_v2,
];
const DEPTH_CLIP_MODE: &[MTLFeatureSet] = &[
MTLFeatureSet::iOS_GPUFamily4_v1,
MTLFeatureSet::tvOS_GPUFamily1_v3,
MTLFeatureSet::macOS_GPUFamily1_v1,
];
const OS_NOT_SUPPORT: (usize, usize) = (10000, 0);
impl super::PrivateCapabilities {
fn supports_any(raw: &metal::DeviceRef, features_sets: &[MTLFeatureSet]) -> bool {
features_sets
.iter()
.cloned()
.any(|x| raw.supports_feature_set(x))
}
pub fn new(device: &metal::Device) -> Self {
#[repr(C)]
#[derive(Clone, Copy, Debug)]
#[allow(clippy::upper_case_acronyms)]
struct NSOperatingSystemVersion {
major: usize,
minor: usize,
patch: usize,
}
impl NSOperatingSystemVersion {
fn at_least(
&self,
mac_version: (usize, usize),
ios_version: (usize, usize),
is_mac: bool,
) -> bool {
if is_mac {
self.major > mac_version.0
|| (self.major == mac_version.0 && self.minor >= mac_version.1)
} else {
self.major > ios_version.0
|| (self.major == ios_version.0 && self.minor >= ios_version.1)
}
}
}
let version: NSOperatingSystemVersion = unsafe {
let process_info: *mut objc::runtime::Object =
msg_send![class!(NSProcessInfo), processInfo];
msg_send![process_info, operatingSystemVersion]
};
let os_is_mac = device.supports_feature_set(MTLFeatureSet::macOS_GPUFamily1_v1);
// Metal was first introduced in OS X 10.11 and iOS 8. The current version number of visionOS is 1.0.0. Additionally,
// on the Simulator, Apple only provides the Apple2 GPU capability, and the Apple2+ GPU capability covers the capabilities of Apple2.
// Therefore, the following conditions can be used to determine if it is visionOS.
// https://developer.apple.com/documentation/metal/developing_metal_apps_that_run_in_simulator
let os_is_xr = version.major < 8 && device.supports_family(MTLGPUFamily::Apple2);
let family_check = os_is_xr || version.at_least((10, 15), (13, 0), os_is_mac);
let mut sample_count_mask = crate::TextureFormatCapabilities::MULTISAMPLE_X4; // 1 and 4 samples are supported on all devices
if device.supports_texture_sample_count(2) {
sample_count_mask |= crate::TextureFormatCapabilities::MULTISAMPLE_X2;
}
if device.supports_texture_sample_count(8) {
sample_count_mask |= crate::TextureFormatCapabilities::MULTISAMPLE_X8;
}
if device.supports_texture_sample_count(16) {
sample_count_mask |= crate::TextureFormatCapabilities::MULTISAMPLE_X16;
}
let rw_texture_tier = if version.at_least((10, 13), (11, 0), os_is_mac) {
device.read_write_texture_support()
} else if version.at_least((10, 12), OS_NOT_SUPPORT, os_is_mac) {
if Self::supports_any(device, &[MTLFeatureSet::macOS_ReadWriteTextureTier2]) {
MTLReadWriteTextureTier::Tier2
} else {
MTLReadWriteTextureTier::Tier1
}
} else {
MTLReadWriteTextureTier::TierNone
};
let mut timestamp_query_support = TimestampQuerySupport::empty();
if version.at_least((11, 0), (14, 0), os_is_mac)
&& device.supports_counter_sampling(metal::MTLCounterSamplingPoint::AtStageBoundary)
{
// If we don't support at stage boundary, don't support anything else.
timestamp_query_support.insert(TimestampQuerySupport::STAGE_BOUNDARIES);
if device.supports_counter_sampling(metal::MTLCounterSamplingPoint::AtDrawBoundary) {
timestamp_query_support.insert(TimestampQuerySupport::ON_RENDER_ENCODER);
}
if device.supports_counter_sampling(metal::MTLCounterSamplingPoint::AtDispatchBoundary)
{
timestamp_query_support.insert(TimestampQuerySupport::ON_COMPUTE_ENCODER);
}
if device.supports_counter_sampling(metal::MTLCounterSamplingPoint::AtBlitBoundary) {
timestamp_query_support.insert(TimestampQuerySupport::ON_BLIT_ENCODER);
}
// `TimestampQuerySupport::INSIDE_WGPU_PASSES` emerges from the other flags.
}
Self {
family_check,
msl_version: if os_is_xr || version.at_least((14, 0), (17, 0), os_is_mac) {
MTLLanguageVersion::V3_1
} else if version.at_least((13, 0), (16, 0), os_is_mac) {
MTLLanguageVersion::V3_0
} else if version.at_least((12, 0), (15, 0), os_is_mac) {
MTLLanguageVersion::V2_4
} else if version.at_least((11, 0), (14, 0), os_is_mac) {
MTLLanguageVersion::V2_3
} else if version.at_least((10, 15), (13, 0), os_is_mac) {
MTLLanguageVersion::V2_2
} else if version.at_least((10, 14), (12, 0), os_is_mac) {
MTLLanguageVersion::V2_1
} else if version.at_least((10, 13), (11, 0), os_is_mac) {
MTLLanguageVersion::V2_0
} else if version.at_least((10, 12), (10, 0), os_is_mac) {
MTLLanguageVersion::V1_2
} else if version.at_least((10, 11), (9, 0), os_is_mac) {
MTLLanguageVersion::V1_1
} else {
MTLLanguageVersion::V1_0
},
// macOS 10.11 doesn't support read-write resources
fragment_rw_storage: version.at_least((10, 12), (8, 0), os_is_mac),
read_write_texture_tier: rw_texture_tier,
msaa_desktop: os_is_mac,
msaa_apple3: if family_check {
device.supports_family(MTLGPUFamily::Apple3)
} else {
device.supports_feature_set(MTLFeatureSet::iOS_GPUFamily3_v4)
},
msaa_apple7: family_check && device.supports_family(MTLGPUFamily::Apple7),
resource_heaps: Self::supports_any(device, RESOURCE_HEAP_SUPPORT),
argument_buffers: Self::supports_any(device, ARGUMENT_BUFFER_SUPPORT),
shared_textures: !os_is_mac,
mutable_comparison_samplers: Self::supports_any(
device,
MUTABLE_COMPARISON_SAMPLER_SUPPORT,
),
sampler_clamp_to_border: Self::supports_any(device, SAMPLER_CLAMP_TO_BORDER_SUPPORT),
indirect_draw_dispatch: Self::supports_any(device, INDIRECT_DRAW_DISPATCH_SUPPORT),
base_vertex_first_instance_drawing: Self::supports_any(
device,
BASE_VERTEX_FIRST_INSTANCE_SUPPORT,
),
dual_source_blending: Self::supports_any(device, DUAL_SOURCE_BLEND_SUPPORT),
low_power: !os_is_mac || device.is_low_power(),
headless: os_is_mac && device.is_headless(),
layered_rendering: Self::supports_any(device, LAYERED_RENDERING_SUPPORT),
function_specialization: Self::supports_any(device, FUNCTION_SPECIALIZATION_SUPPORT),
depth_clip_mode: Self::supports_any(device, DEPTH_CLIP_MODE),
texture_cube_array: Self::supports_any(device, TEXTURE_CUBE_ARRAY_SUPPORT),
supports_float_filtering: os_is_mac
|| (version.at_least((11, 0), (14, 0), os_is_mac)
&& device.supports_32bit_float_filtering()),
format_depth24_stencil8: os_is_mac && device.d24_s8_supported(),
format_depth32_stencil8_filter: os_is_mac,
format_depth32_stencil8_none: !os_is_mac,
format_min_srgb_channels: if os_is_mac { 4 } else { 1 },
format_b5: !os_is_mac,
format_bc: os_is_mac,
format_eac_etc: !os_is_mac
// M1 in macOS supports EAC/ETC2
|| (family_check && device.supports_family(MTLGPUFamily::Apple7)),
// A8(Apple2) and later always support ASTC pixel formats
format_astc: (family_check && device.supports_family(MTLGPUFamily::Apple2))
|| Self::supports_any(device, ASTC_PIXEL_FORMAT_FEATURES),
// A13(Apple6) M1(Apple7) and later always support HDR ASTC pixel formats
format_astc_hdr: family_check && device.supports_family(MTLGPUFamily::Apple6),
format_any8_unorm_srgb_all: Self::supports_any(device, ANY8_UNORM_SRGB_ALL),
format_any8_unorm_srgb_no_write: !Self::supports_any(device, ANY8_UNORM_SRGB_ALL)
&& !os_is_mac,
format_any8_snorm_all: Self::supports_any(device, ANY8_SNORM_RESOLVE),
format_r16_norm_all: os_is_mac,
// No devices support r32's all capabilities
format_r32_all: false,
// All devices support r32's write capability
format_r32_no_write: false,
// iOS support r32float's write capability, macOS support r32float's all capabilities
format_r32float_no_write_no_filter: false,
// Only iOS doesn't support r32float's filter capability
format_r32float_no_filter: !os_is_mac,
format_r32float_all: os_is_mac,
format_rgba8_srgb_all: Self::supports_any(device, RGBA8_SRGB),
format_rgba8_srgb_no_write: !Self::supports_any(device, RGBA8_SRGB),
format_rgb10a2_unorm_all: Self::supports_any(device, RGB10A2UNORM_ALL),
format_rgb10a2_unorm_no_write: !Self::supports_any(device, RGB10A2UNORM_ALL),
format_rgb10a2_uint_write: Self::supports_any(device, RGB10A2UINT_WRITE),
format_rg11b10_all: Self::supports_any(device, RG11B10FLOAT_ALL),
format_rg11b10_no_write: !Self::supports_any(device, RG11B10FLOAT_ALL),
format_rgb9e5_all: Self::supports_any(device, RGB9E5FLOAT_ALL),
format_rgb9e5_no_write: !Self::supports_any(device, RGB9E5FLOAT_ALL) && !os_is_mac,
format_rgb9e5_filter_only: os_is_mac,
format_rg32_color: true,
format_rg32_color_write: true,
// Only macOS support rg32float's all capabilities
format_rg32float_all: os_is_mac,
// All devices support rg32float's color + blend capabilities
format_rg32float_color_blend: true,
// Only iOS doesn't support rg32float's filter
format_rg32float_no_filter: !os_is_mac,
format_rgba32int_color: true,
// All devices support rgba32uint and rgba32sint's color + write capabilities
format_rgba32int_color_write: true,
format_rgba32float_color: true,
// All devices support rgba32float's color + write capabilities
format_rgba32float_color_write: true,
// Only macOS support rgba32float's all capabilities
format_rgba32float_all: os_is_mac,
format_depth16unorm: Self::supports_any(
device,
&[
MTLFeatureSet::iOS_GPUFamily3_v3,
MTLFeatureSet::macOS_GPUFamily1_v2,
],
),
format_depth32float_filter: os_is_mac,
format_depth32float_none: !os_is_mac,
format_bgr10a2_all: Self::supports_any(device, BGR10A2_ALL),
format_bgr10a2_no_write: !Self::supports_any(device, BGR10A2_ALL),
max_buffers_per_stage: 31,
max_vertex_buffers: 31.min(crate::MAX_VERTEX_BUFFERS as u32),
max_textures_per_stage: if os_is_mac
|| (family_check && device.supports_family(MTLGPUFamily::Apple6))
{
128
} else if family_check && device.supports_family(MTLGPUFamily::Apple4) {
96
} else {
31
},
max_samplers_per_stage: 16,
buffer_alignment: if os_is_mac || os_is_xr { 256 } else { 64 },
max_buffer_size: if version.at_least((10, 14), (12, 0), os_is_mac) {
// maxBufferLength available on macOS 10.14+ and iOS 12.0+
let buffer_size: metal::NSInteger =
unsafe { msg_send![device.as_ref(), maxBufferLength] };
buffer_size as _
} else if os_is_mac {
1 << 30 // 1GB on macOS 10.11 and up
} else {
1 << 28 // 256MB on iOS 8.0+
},
max_texture_size: if Self::supports_any(
device,
&[
MTLFeatureSet::iOS_GPUFamily3_v1,
MTLFeatureSet::tvOS_GPUFamily2_v1,
MTLFeatureSet::macOS_GPUFamily1_v1,
],
) {
16384
} else {
8192
},
max_texture_3d_size: 2048,
max_texture_layers: 2048,
max_fragment_input_components: if os_is_mac
|| device.supports_feature_set(MTLFeatureSet::iOS_GPUFamily4_v1)
{
124
} else {
60
},
max_color_render_targets: if Self::supports_any(
device,
&[
MTLFeatureSet::iOS_GPUFamily2_v1,
MTLFeatureSet::tvOS_GPUFamily1_v1,
MTLFeatureSet::macOS_GPUFamily1_v1,
],
) {
8
} else {
4
},
// Per https://developer.apple.com/metal/Metal-Feature-Set-Tables.pdf
max_color_attachment_bytes_per_sample: if family_check
&& device.supports_family(MTLGPUFamily::Apple4)
{
64
} else {
32
},
max_varying_components: if device
.supports_feature_set(MTLFeatureSet::macOS_GPUFamily1_v1)
{
124
} else {
60
},
max_threads_per_group: if Self::supports_any(
device,
&[
MTLFeatureSet::iOS_GPUFamily4_v2,
MTLFeatureSet::macOS_GPUFamily1_v1,
],
) {
1024
} else {
512
},
max_total_threadgroup_memory: if Self::supports_any(
device,
&[
MTLFeatureSet::iOS_GPUFamily4_v1,
MTLFeatureSet::macOS_GPUFamily1_v2,
],
) {
32 << 10
} else {
16 << 10
},
sample_count_mask,
supports_debug_markers: Self::supports_any(
device,
&[
MTLFeatureSet::macOS_GPUFamily1_v2,
MTLFeatureSet::iOS_GPUFamily1_v3,
MTLFeatureSet::tvOS_GPUFamily1_v2,
],
),
supports_binary_archives: family_check
&& (device.supports_family(MTLGPUFamily::Apple3)
|| device.supports_family(MTLGPUFamily::Mac1)),
supports_capture_manager: version.at_least((10, 13), (11, 0), os_is_mac),
can_set_maximum_drawables_count: version.at_least((10, 14), (11, 2), os_is_mac),
can_set_display_sync: version.at_least((10, 13), OS_NOT_SUPPORT, os_is_mac),
can_set_next_drawable_timeout: version.at_least((10, 13), (11, 0), os_is_mac),
supports_arrays_of_textures: Self::supports_any(
device,
&[
MTLFeatureSet::iOS_GPUFamily3_v2,
MTLFeatureSet::tvOS_GPUFamily2_v1,
MTLFeatureSet::macOS_GPUFamily1_v3,
],
),
supports_arrays_of_textures_write: family_check
&& (device.supports_family(MTLGPUFamily::Apple6)
|| device.supports_family(MTLGPUFamily::Mac1)
|| device.supports_family(MTLGPUFamily::MacCatalyst1)),
supports_mutability: version.at_least((10, 13), (11, 0), os_is_mac),
//Depth clipping is supported on all macOS GPU families and iOS family 4 and later
supports_depth_clip_control: os_is_mac
|| device.supports_feature_set(MTLFeatureSet::iOS_GPUFamily4_v1),
supports_preserve_invariance: version.at_least((11, 0), (13, 0), os_is_mac),
// Metal 2.2 on mac, 2.3 on iOS.
supports_shader_primitive_index: version.at_least((10, 15), (14, 0), os_is_mac),
has_unified_memory: if version.at_least((10, 15), (13, 0), os_is_mac) {
Some(device.has_unified_memory())
} else {
None
},
timestamp_query_support,
supports_simd_scoped_operations: family_check
&& (device.supports_family(MTLGPUFamily::Metal3)
|| device.supports_family(MTLGPUFamily::Mac2)
|| device.supports_family(MTLGPUFamily::Apple7)),
// https://developer.apple.com/metal/Metal-Feature-Set-Tables.pdf#page=5
int64: family_check
&& (device.supports_family(MTLGPUFamily::Apple3)
|| device.supports_family(MTLGPUFamily::Metal3)),
// https://developer.apple.com/metal/Metal-Feature-Set-Tables.pdf#page=6
int64_atomics: family_check
&& ((device.supports_family(MTLGPUFamily::Apple8)
&& device.supports_family(MTLGPUFamily::Mac2))
|| device.supports_family(MTLGPUFamily::Apple9)),
}
}
pub fn device_type(&self) -> wgt::DeviceType {
if self.has_unified_memory.unwrap_or(self.low_power) {
wgt::DeviceType::IntegratedGpu
} else {
wgt::DeviceType::DiscreteGpu
}
}
pub fn features(&self) -> wgt::Features {
use wgt::Features as F;
let mut features = F::empty()
| F::MAPPABLE_PRIMARY_BUFFERS
| F::VERTEX_WRITABLE_STORAGE
| F::TEXTURE_ADAPTER_SPECIFIC_FORMAT_FEATURES
| F::PUSH_CONSTANTS
| F::POLYGON_MODE_LINE
| F::CLEAR_TEXTURE
| F::TEXTURE_FORMAT_16BIT_NORM
| F::SHADER_F16
| F::DEPTH32FLOAT_STENCIL8
| F::BGRA8UNORM_STORAGE;
features.set(F::FLOAT32_FILTERABLE, self.supports_float_filtering);
features.set(
F::INDIRECT_FIRST_INSTANCE | F::MULTI_DRAW_INDIRECT,
self.indirect_draw_dispatch,
);
features.set(
F::TIMESTAMP_QUERY | F::TIMESTAMP_QUERY_INSIDE_ENCODERS,
self.timestamp_query_support
.contains(TimestampQuerySupport::STAGE_BOUNDARIES),
);
features.set(
F::TIMESTAMP_QUERY_INSIDE_PASSES,
self.timestamp_query_support
.contains(TimestampQuerySupport::INSIDE_WGPU_PASSES),
);
features.set(
F::DUAL_SOURCE_BLENDING,
self.msl_version >= MTLLanguageVersion::V1_2 && self.dual_source_blending,
);
features.set(F::TEXTURE_COMPRESSION_ASTC, self.format_astc);
features.set(F::TEXTURE_COMPRESSION_ASTC_HDR, self.format_astc_hdr);
features.set(F::TEXTURE_COMPRESSION_BC, self.format_bc);
features.set(F::TEXTURE_COMPRESSION_BC_SLICED_3D, self.format_bc); // BC guarantees Sliced 3D
features.set(F::TEXTURE_COMPRESSION_ETC2, self.format_eac_etc);
features.set(F::DEPTH_CLIP_CONTROL, self.supports_depth_clip_control);
features.set(
F::SHADER_PRIMITIVE_INDEX,
self.supports_shader_primitive_index,
);
features.set(
F::TEXTURE_BINDING_ARRAY
| F::SAMPLED_TEXTURE_AND_STORAGE_BUFFER_ARRAY_NON_UNIFORM_INDEXING
| F::UNIFORM_BUFFER_AND_STORAGE_TEXTURE_ARRAY_NON_UNIFORM_INDEXING,
self.msl_version >= MTLLanguageVersion::V2_0 && self.supports_arrays_of_textures,
);
//// XXX: this is technically not true, as read-only storage images can be used in arrays
//// on precisely the same conditions that sampled textures can. But texel fetch from a
//// sampled texture is a thing; should we bother introducing another feature flag?
if self.msl_version >= MTLLanguageVersion::V2_2
&& self.supports_arrays_of_textures
&& self.supports_arrays_of_textures_write
{
features.insert(F::STORAGE_RESOURCE_BINDING_ARRAY);
}
features.set(
F::SHADER_INT64,
self.int64 && self.msl_version >= MTLLanguageVersion::V2_3,
);
features.set(
F::SHADER_INT64_ATOMIC_MIN_MAX,
self.int64_atomics && self.msl_version >= MTLLanguageVersion::V2_4,
);
features.set(
F::ADDRESS_MODE_CLAMP_TO_BORDER,
self.sampler_clamp_to_border,
);
features.set(F::ADDRESS_MODE_CLAMP_TO_ZERO, true);
features.set(F::RG11B10UFLOAT_RENDERABLE, self.format_rg11b10_all);
if self.supports_simd_scoped_operations {
features.insert(F::SUBGROUP | F::SUBGROUP_BARRIER);
}
features
}
pub fn capabilities(&self) -> crate::Capabilities {
let mut downlevel = wgt::DownlevelCapabilities::default();
downlevel.flags.set(
wgt::DownlevelFlags::FRAGMENT_WRITABLE_STORAGE,
self.fragment_rw_storage,
);
downlevel.flags.set(
wgt::DownlevelFlags::CUBE_ARRAY_TEXTURES,
self.texture_cube_array,
);
// TODO: separate the mutable comparisons from immutable ones
downlevel.flags.set(
wgt::DownlevelFlags::COMPARISON_SAMPLERS,
self.mutable_comparison_samplers,
);
downlevel.flags.set(
wgt::DownlevelFlags::INDIRECT_EXECUTION,
self.indirect_draw_dispatch,
);
// TODO: add another flag for `first_instance`
downlevel.flags.set(
wgt::DownlevelFlags::BASE_VERTEX,
self.base_vertex_first_instance_drawing,
);
downlevel
.flags
.set(wgt::DownlevelFlags::ANISOTROPIC_FILTERING, true);
let base = wgt::Limits::default();
crate::Capabilities {
limits: wgt::Limits {
max_texture_dimension_1d: self.max_texture_size as u32,
max_texture_dimension_2d: self.max_texture_size as u32,
max_texture_dimension_3d: self.max_texture_3d_size as u32,
max_texture_array_layers: self.max_texture_layers as u32,
max_bind_groups: 8,
max_bindings_per_bind_group: 65535,
max_dynamic_uniform_buffers_per_pipeline_layout: base
.max_dynamic_uniform_buffers_per_pipeline_layout,
max_dynamic_storage_buffers_per_pipeline_layout: base
.max_dynamic_storage_buffers_per_pipeline_layout,
max_sampled_textures_per_shader_stage: self.max_textures_per_stage,
max_samplers_per_shader_stage: self.max_samplers_per_stage,
max_storage_buffers_per_shader_stage: self.max_buffers_per_stage,
max_storage_textures_per_shader_stage: self.max_textures_per_stage,
max_uniform_buffers_per_shader_stage: self.max_buffers_per_stage,
max_uniform_buffer_binding_size: self.max_buffer_size.min(!0u32 as u64) as u32,
max_storage_buffer_binding_size: self.max_buffer_size.min(!0u32 as u64) as u32,
max_vertex_buffers: self.max_vertex_buffers,
max_vertex_attributes: 31,
max_vertex_buffer_array_stride: base.max_vertex_buffer_array_stride,
min_subgroup_size: 4,
max_subgroup_size: 64,
max_push_constant_size: 0x1000,
min_uniform_buffer_offset_alignment: self.buffer_alignment as u32,
min_storage_buffer_offset_alignment: self.buffer_alignment as u32,
max_inter_stage_shader_components: self.max_varying_components,
max_color_attachments: (self.max_color_render_targets as u32)
.min(crate::MAX_COLOR_ATTACHMENTS as u32),
max_color_attachment_bytes_per_sample: self.max_color_attachment_bytes_per_sample
as u32,
max_compute_workgroup_storage_size: self.max_total_threadgroup_memory,
max_compute_invocations_per_workgroup: self.max_threads_per_group,
max_compute_workgroup_size_x: self.max_threads_per_group,
max_compute_workgroup_size_y: self.max_threads_per_group,
max_compute_workgroup_size_z: self.max_threads_per_group,
max_compute_workgroups_per_dimension: 0xFFFF,
max_buffer_size: self.max_buffer_size,
max_non_sampler_bindings: u32::MAX,
},
alignments: crate::Alignments {
buffer_copy_offset: wgt::BufferSize::new(self.buffer_alignment).unwrap(),
buffer_copy_pitch: wgt::BufferSize::new(4).unwrap(),
// This backend has Naga incorporate bounds checks into the