Attempting to run the 'hello-cube' example on OS X v10.11 El Capitan gives error: "[ERROR gfx_backend_metal::device] Error compiling the shader"

[A-R-M]

• Harmony version: commit bd4300ffbc651aeea8e625606645d90021cad83a
• Active Rust Toolchain:
  stable-x86_64-apple-darwin (default)
  rustc 1.44.1 (c7087fe00 2020-06-17)
• OS: OS X v10.11.6 El Capitan
• GPU: Intel HD Graphics 4000
• Computer: Mac mini (Late 2012)

When attempting to run the hello-cube example, I get the following output:

$ METAL_DEVICE_WRAPPER_TYPE=1 RUST_BACKTRACE=full cargo run --example hello-cube
warning: unused import: `PointLightData`
  --> examples/hello-cube.rs:12:80
   |
12 |     components::{CameraData, DirectionalLightData, LightType, Mesh, Transform, PointLightData},
   |                                                                                ^^^^^^^^^^^^^^
   |
   = note: `#[warn(unused_imports)]` on by default

warning: 1 warning emitted

    Finished dev [unoptimized + debuginfo] target(s) in 0.19s
     Running `target/debug/examples/hello-cube`
2020-07-17 06:25:10.883 hello-cube[59451:227586] Metal API Validation Enabled
[2020-07-17T10:25:10Z WARN  wgpu_core::instance] Missing features: INDEPENDENT_BLENDING
[2020-07-17T10:25:10Z WARN  naga::front::spv] Unknown decoration ColMajor
[2020-07-17T10:25:10Z WARN  naga::front::spv] Unknown decoration MatrixStride
[2020-07-17T10:25:10Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: MissingDecoration(Offset)
[2020-07-17T10:25:10Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:10Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: UnsupportedInstruction(Function, FMul)
[2020-07-17T10:25:10Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration ColMajor
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration MatrixStride
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration ColMajor
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration MatrixStride
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration ColMajor
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration MatrixStride
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: MissingDecoration(Offset)
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration ColMajor
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration MatrixStride
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration ColMajor
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration MatrixStride
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration ColMajor
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration MatrixStride
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: MissingDecoration(Offset)
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration ColMajor
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration MatrixStride
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration ColMajor
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration MatrixStride
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration ColMajor
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration MatrixStride
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: UnsupportedInstruction(Type, TypeBool)
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration ColMajor
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration MatrixStride
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration ColMajor
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration MatrixStride
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration ColMajor
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration MatrixStride
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration ColMajor
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration MatrixStride
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: MissingDecoration(Offset)
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration ColMajor
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration MatrixStride
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration ColMajor
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration MatrixStride
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration ColMajor
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration MatrixStride
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: UnsupportedInstruction(Type, TypeBool)
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:11Z WARN  metal::device] Shader warnings: Compilation succeeded with: 
    
    <program source>:197:20: warning: unused variable 'Lunnormalized'
                float3 Lunnormalized = L_1;
                       ^
    
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration Flat
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: MissingDecoration(Offset)
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration Flat
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: UnsupportedInstruction(Function, Variable)
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration Flat
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: MissingDecoration(Offset)
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration Flat
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: UnsupportedInstruction(Type, TypeBool)
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration Flat
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: MissingDecoration(Offset)
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration Flat
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: UnsupportedInstruction(Type, TypeBool)
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: MissingDecoration(Offset)
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: UnsupportedInstruction(Function, ImageSampleExplicitLod)
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration Flat
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: MissingDecoration(Offset)
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration Flat
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: UnsupportedInstruction(Type, TypeBool)
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration Flat
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: MissingDecoration(Offset)
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration Flat
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: UnsupportedInstruction(Type, TypeBool)
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: MissingDecoration(Offset)
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: UnsupportedInstruction(Type, TypeBool)
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration ColMajor
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration MatrixStride
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: MissingDecoration(Offset)
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: UnsupportedInstruction(Type, TypeBool)
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration ColMajor
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration MatrixStride
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: MissingDecoration(Offset)
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration ColMajor
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration MatrixStride
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration ColMajor
[2020-07-17T10:25:11Z WARN  naga::front::spv] Unknown decoration MatrixStride
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: MissingDecoration(Offset)
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: UnsupportedInstruction(Function, Variable)
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Failed to parse shader SPIR-V code: MissingDecoration(Offset)
[2020-07-17T10:25:11Z WARN  wgpu_core::device] Shader module will not be validated
[2020-07-17T10:25:11Z ERROR gfx_backend_metal::device] Error compiling the shader CompilationFailed("Compilation failed: \n\n<program source>:47:43: error: no matching conversion for functional-style cast from \'void\' to \'spvUnsafeArray<float3, 36>\'\nconstant spvUnsafeArray<float3, 36> _29 = spvUnsafeArray<float3, 36>({ float3(1.0), float3(1.0, 1.0, -1.0), float3(1.0, -1.0, 1.0), float3(1.0, -1.0, 1.0), float3(1.0, 1.0, -1.0), float3(1.0, -1.0, -1.0), float3(-1.0, 1.0, -1.0), float3(-1.0, 1.0, 1.0), float3(-1.0), float3(-1.0), float3(-1.0, 1.0, 1.0), float3(-1.0, -1.0, 1.0), float3(-1.0, 1.0, -1.0), float3(1.0, 1.0, -1.0), float3(-1.0, 1.0, 1.0), float3(-1.0, 1.0, 1.0), float3(1.0, 1.0, -1.0), float3(1.0), float3(-1.0, -1.0, 1.0), float3(1.0, -1.0, 1.0), float3(-1.0), float3(-1.0), float3(1.0, -1.0, 1.0), float3(1.0, -1.0, -1.0), float3(-1.0, 1.0, 1.0), float3(1.0), float3(-1.0, -1.0, 1.0), float3(-1.0, -1.0, 1.0), float3(1.0), float3(1.0, -1.0, 1.0), float3(1.0, 1.0, -1.0), float3(-1.0, 1.0, -1.0), float3(1.0, -1.0, -1.0), float3(1.0, -1.0, -1.0), float3(-1.0, 1.0, -1.0), float3(-1.0) });\n                                          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n<program source>:10:8: note: candidate constructor (the implicit copy constructor) not viable: cannot convert initializer list argument to \'const spvUnsafeArray<float __attribute__((ext_vector_type(3))), 36>\'\nstruct spvUnsafeArray\n       ^\n<program source>:10:8: note: candidate constructor (the implicit copy constructor) not viable: cannot convert initializer list argument to \'const device spvUnsafeArray<float __attribute__((ext_vector_type(3))), 36>\'\nstruct spvUnsafeArray\n       ^\n<program source>:10:8: note: candidate constructor (the implicit copy constructor) not viable: cannot convert initializer list argument to \'const threadgroup spvUnsafeArray<float __attribute__((ext_vector_type(3))), 36>\'\nstruct spvUnsafeArray\n       ^\n<program source>:10:8: note: candidate constructor (the implicit copy constructor) not viable: cannot convert initializer list argument to \'const constant spvUnsafeArray<float __attribute__((ext_vector_type(3))), 36>\'\nstruct spvUnsafeArray\n       ^\n<program source>:10:8: note: candidate constructor (the implicit move constructor) not viable: cannot convert initializer list argument to \'spvUnsafeArray<float __attribute__((ext_vector_type(3))), 36>\'\nstruct spvUnsafeArray\n       ^\n<program source>:10:8: note: candidate constructor (the implicit default constructor) not viable: requires 0 arguments, but 1 was provided\n<program source>:48:42: error: no matching conversion for functional-style cast from \'void\' to \'spvUnsafeArray<float2, 6>\'\nconstant spvUnsafeArray<float2, 6> _53 = spvUnsafeArray<float2, 6>({ float2(-1.0), float2(1.0, -1.0), float2(-1.0, 1.0), float2(-1.0, 1.0), float2(1.0, -1.0), float2(1.0) });\n                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n<program source>:10:8: note: candidate constructor (the implicit copy constructor) not viable: cannot convert initializer list argument to \'const spvUnsafeArray<float __attribute__((ext_vector_type(2))), 6>\'\nstruct spvUnsafeArray\n       ^\n<program source>:10:8: note: candidate constructor (the implicit copy constructor) not viable: cannot convert initializer list argument to \'const device spvUnsafeArray<float __attribute__((ext_vector_type(2))), 6>\'\nstruct spvUnsafeArray\n       ^\n<program source>:10:8: note: candidate constructor (the implicit copy constructor) not viable: cannot convert initializer list argument to \'const threadgroup spvUnsafeArray<float __attribute__((ext_vector_type(2))), 6>\'\nstruct spvUnsafeArray\n       ^\n<program source>:10:8: note: candidate constructor (the implicit copy constructor) not viable: cannot convert initializer list argument to \'const constant spvUnsafeArray<float __attribute__((ext_vector_type(2))), 6>\'\nstruct spvUnsafeArray\n       ^\n<program source>:10:8: note: candidate constructor (the implicit move constructor) not viable: cannot convert initializer list argument to \'spvUnsafeArray<float __attribute__((ext_vector_type(2))), 6>\'\nstruct spvUnsafeArray\n       ^\n<program source>:10:8: note: candidate constructor (the implicit default constructor) not viable: requires 0 arguments, but 1 was provided\n")
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Other', /Users/username/.cargo/git/checkouts/wgpu-53e70f8674b08dd4/43c67ac/wgpu-core/src/device/mod.rs:2315:17
stack backtrace:
   0:        0x10a190e4f - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h8ad47541fb823094
   1:        0x10a1b4e7e - core::fmt::write::he23e9bd6497f06c3
   2:        0x10a18d797 - std::io::Write::write_fmt::h91528f1131e6004e
   3:        0x10a192efa - std::panicking::default_hook::{{closure}}::h1983f014a45a477e
   4:        0x10a192c3c - std::panicking::default_hook::hb0d9b93b5be8b120
   5:        0x10a1935a8 - std::panicking::rust_panic_with_hook::h9f3faafe0983de5c
   6:        0x10a193142 - rust_begin_unwind
   7:        0x10a1b2bbf - core::panicking::panic_fmt::h0a2d1b3ca0b14316
   8:        0x10a1b2a05 - core::option::expect_none_failed::haea18d6ed867f4e9
   9:        0x10945cc76 - core::result::Result<T,E>::unwrap::hae914ba7279b340a
  10:        0x10929fe88 - wgpu_core::device::<impl wgpu_core::hub::Global<G>>::device_create_render_pipeline::h460451028d4887b4
  11:        0x1092b74d2 - wgpu::backend::direct::<impl wgpu::Context for wgpu_core::hub::Global<wgpu_core::hub::IdentityManagerFactory>>::device_create_render_pipeline::h0db6e69f9b79edcd
  12:        0x10932eb2b - wgpu::Device::create_render_pipeline::h91929ef614a5bc31
  13:        0x108a445e0 - harmony::graphics::pipeline::SimplePipelineDesc::pipeline::h4d997a24c885e5ea
  14:        0x108a49087 - harmony::graphics::render_graph::RenderGraph::add::hc2e17c529793e2dc
  15:        0x108a35221 - harmony::graphics::material::skybox::Skybox::new_hdr::h9491772f8bc67b8c
  16:        0x108a306f6 - <hello_cube::AppState as harmony::application::AppState>::load::h75584cd4d604e419
  17:        0x108a914c1 - harmony::application::Application::load::hd6500b94167dba21
  18:        0x108a3123f - hello_cube::main::hf82171171da901f6
  19:        0x108a617be - std::rt::lang_start::{{closure}}::hfc682bbfb4c1749f
  20:        0x10a1939d9 - std::rt::lang_start_internal::h795af50241e12334
  21:        0x108a617a1 - std::rt::lang_start::he936ede608aba919
  22:        0x108a31382 - main

I’m guessing that error is related to me using OS X v10.11 El Capitan (the very first version of macOS to support Metal, and thus is using Metal 1).

Sidenote: The other examples run on this computer (with warnings), except for benchmark which gives a compile time error.

[StarArawn]

If you have time can you pull the code from the wgpu repo to test the examples? The best example to test is likely water or shadow. It's my guess that metal 1 isn't fully supported by webgpu possibly. I don't have a metal 1 macbook to test with either. :(

[StarArawn]

Related to the array constants in the equirectangular_to_cube_faces_vert shader.

Example:

const vec2[6] verts = {
    vec2(-1.0, -1.0),
    vec2(1.0, -1.0),
    vec2(-1.0, 1.0),
    vec2(-1.0, 1.0),
    vec2(1.0, -1.0),
    vec2(1.0, 1.0)
};

Compiles to:

constant spvUnsafeArray<float2, 6> _53 = spvUnsafeArray<float2, 6>({ float2(-1.0), float2(1.0, -1.0), float2(-1.0, 1.0), float2(-1.0, 1.0), float2(1.0, -1.0), float2(1.0) });

[A-R-M]

wgpu-rs Version: commit d0825a219511c28bf74f8cbef9056b55fde4e04e
wgpu Version: commit a0ed09a6a83dc0d16c6ad711cf139a5fcfbb9c35

Just tested them… and you’re absolutely right! 😂

While simple examples like cube look exactly like they should, water and shadow are a completely different story.

Starting with shadow, I get no runtime errors, but the resulting window is a complete mess. It also causes my Mac to completely lock up and then kernel panic if I leave it animating for more than a few seconds. 😂 I managed to take some screenshots after a few kernel panics:

As for water, it tries but fails to open a window, instead giving the following errors and then crashing:

$ RUST_BACKTRACE=full cargo run --example water
warning: missing documentation for an associated function
    --> src/lib.rs:1016:5
     |
1016 | /     pub unsafe fn create_surface_from_core_animation_layer(
1017 | |         &self,
1018 | |         layer: *mut std::ffi::c_void,
1019 | |     ) -> Surface {
...    |
1036 | |         }
1037 | |     }
     | |_____^
     |
note: the lint level is defined here
    --> src/lib.rs:6:9
     |
6    | #![warn(missing_docs)]
     |         ^^^^^^^^^^^^

warning: 1 warning emitted

    Finished dev [unoptimized + debuginfo] target(s) in 0.70s
     Running `target/debug/examples/water`
[2020-07-17T12:50:07Z ERROR gfx_backend_metal::device] Error compiling the shader CompilationFailed("Compilation failed: \n\n<program source>:17:4: error: \'early_fragment_tests\' attribute requires metal language to be 2.0 or higher\n[[ early_fragment_tests ]] fragment main0_out main0(main0_in in [[stage_in]])\n   ^~~~~~~~~~~~~~~~~~~~\n")
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Other', /Users/username/.cargo/git/checkouts/wgpu-53e70f8674b08dd4/a0ed09a/wgpu-core/src/device/mod.rs:2423:17
stack backtrace:
   0:        0x10daa68bf - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h8ad47541fb823094
   1:        0x10dac932e - core::fmt::write::he23e9bd6497f06c3
   2:        0x10daa45b7 - std::io::Write::write_fmt::h91528f1131e6004e
   3:        0x10daa872a - std::panicking::default_hook::{{closure}}::h1983f014a45a477e
   4:        0x10daa846c - std::panicking::default_hook::hb0d9b93b5be8b120
   5:        0x10daa8dd8 - std::panicking::rust_panic_with_hook::h9f3faafe0983de5c
   6:        0x10daa8972 - rust_begin_unwind
   7:        0x10dac706f - core::panicking::panic_fmt::h0a2d1b3ca0b14316
   8:        0x10dac6eb5 - core::option::expect_none_failed::haea18d6ed867f4e9
   9:        0x10d0da8a6 - core::result::Result<T,E>::unwrap::h021efc7c95cba597
  10:        0x10d294483 - wgpu_core::device::<impl wgpu_core::hub::Global<G>>::device_create_render_pipeline::hc70bb9355a5dc22c
  11:        0x10d0d2f07 - wgpu::backend::direct::<impl wgpu::Context for wgpu_core::hub::Global<wgpu_core::hub::IdentityManagerFactory>>::device_create_render_pipeline::he800cf8a07454223
  12:        0x10d1fc57b - wgpu::Device::create_render_pipeline::h1dbfe7ff72aceb6b
  13:        0x10cec1d8c - <water::Example as water::framework::Example>::init::ha37bda679d66fc70
  14:        0x10ce79c12 - water::framework::start::h115bb9aa3b426cf5
  15:        0x10ce7a975 - water::framework::run::hb073f255cbaab748
  16:        0x10cec2a58 - water::main::h6a5a0d897487ccb0
  17:        0x10ce89b8e - std::rt::lang_start::{{closure}}::h0adcbab3cb76d8c8
  18:        0x10daa9139 - std::rt::lang_start_internal::h795af50241e12334
  19:        0x10ce89b71 - std::rt::lang_start::h8e92768106f5d93b
  20:        0x10cec2a82 - main
[2020-07-17T12:50:07Z ERROR gfx_memory::heaps] Heaps not completely freed before drop. Utilization: MemoryHeapUtilization { utilization: MemoryUtilization { used: 8126464, effective: 4460800 }, size: 18446744073709551615 }
[2020-07-17T12:50:07Z ERROR gfx_memory::heaps] Heaps not completely freed before drop. Utilization: MemoryHeapUtilization { utilization: MemoryUtilization { used: 16777216, effective: 346368 }, size: 268435456 }
[2020-07-17T12:50:07Z ERROR gfx_memory::allocator::general] Memory leak: SizeEntry(15872) is still used
[2020-07-17T12:50:07Z ERROR gfx_memory::allocator::general] Memory leak: SizeEntry(126976) is still used
[2020-07-17T12:50:07Z ERROR gfx_memory::allocator::general] Memory leak: SizeEntry(31744) is still used
[2020-07-17T12:50:07Z ERROR gfx_memory::allocator::general] Memory leak: SizeEntry(253952) is still used
[2020-07-17T12:50:07Z ERROR gfx_memory::allocator::general] Memory leak: SizeEntry(63488) is still used
[2020-07-17T12:50:07Z ERROR gfx_memory::allocator::general] Memory leak: SizeEntry(507904) is still used
[2020-07-17T12:50:07Z ERROR gfx_memory::allocator::general] Memory leak: SizeEntry(1015808) is still used
[2020-07-17T12:50:07Z ERROR gfx_memory::allocator::general] Memory leak: SizeEntry(2031616) is still used
[2020-07-17T12:50:07Z ERROR gfx_memory::allocator::general] Memory leak: SizeEntry(329728) is still used
[2020-07-17T12:50:07Z ERROR gfx_memory::allocator::general] Memory leak: SizeEntry(256) is still used
[2020-07-17T12:50:07Z ERROR gfx_memory::allocator::general] Memory leak: SizeEntry(1920000) is still used
[2020-07-17T12:50:07Z ERROR gfx_memory::allocator::linear] Not all allocations from LinearAllocator were freed
[2020-07-17T12:50:07Z ERROR gfx_descriptor::allocator] DescriptorAllocator is dropped
[2020-07-17T12:50:07Z ERROR gfx_backend_metal::command] Command buffer not released properly!

Of particular interest is this part of the error:

Compilation failed: \n\n<program source>:17:4: error: \'early_fragment_tests\' attribute requires metal language to be 2.0 or higher

which I believe confirms your suspicion. 😩

[StarArawn]

As a side note the custom pipeline example works because it's pretty basic. You can write out some of your own pipelines and shaders which should work fine as long as you stay within the confines of metal 1. I could fix the issue above by possibly using a uniform and passing in the different const arrays that way, but I'm not sure I want to try and support metal 1 as it has some limitations that I plan on breaking fairly soon.. The biggest one being the lack of support for arrays of textures.

[kvark]

Hi everybody! There is a lot of stuff mixed up here.

@A-R-M @StarArawn

Compilation failed: \n\n:47:43: error: no matching conversion for functional-style cast from 'void' to

IIRC, SPIRV-Cross has issues with arrays on Metal. Things like KhronosGroup/SPIRV-Cross#1394 (there are more issues in there).
Be careful with fixed-size const arrays, basically (i.e. try not to use them). As we are replacing SPIRV-Cross in the long run with Naga, we'll strive to not fail on that, but Naga is still a long way to go before we can use it.

Starting with shadow, I get no runtime errors, but the resulting window is a complete mess.

This is gfx-rs/wgpu#103, which has been known for a while. I concluded this to be a driver issue, and it was indeed fixed in one of the OS updates after 10.11. Right now I'm on 10.15, and it woks correctly.

It's unlikely that you'll hit the issue unless you use texture arrays with depth comparison.

Compilation failed: \n\n:17:4: error: 'early_fragment_tests' attribute requires metal language to be 2.0 or higher\n[[ early_fragment_tests ]] fragment main0_out main0(main0_in in [[stage_in]])\n

The water example also presumably fails because SPIRV-Cross fails to check for MSL version when it tries to add the early_fragment_tests attribute. Also @StarArawn filed it to us as gfx-rs/wgpu-rs#445.
It's easy to workaround - just make sure your SPIRV don't use this attribute, for now.

[A-R-M]

This is gfx-rs/wgpu#103, which has been known for a while. I concluded this to be a driver issue, and it was indeed fixed in one of the OS updates after 10.11. Right now I'm on 10.15, and it woks correctly.

Thanks for that link to the issue for the driver bug! At this point, it seems like staying on 10.11 is far too limiting; I have an SSD on the way (APFS runs horribly on HDDs) and will just update to 10.15 as soon as possible. 😅