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spirv-builder: update ShaderPanicStrategy::DebugPrintfThenExit docs with newer information.

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Eduard-Mihai Burtescu 2023-07-20 07:44:04 +03:00 committed by Eduard-Mihai Burtescu
parent 24f42f2b42
commit 70728c7cc1
1 changed files with 34 additions and 9 deletions
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crates/spirv-builder/src/lib.rs
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@ -193,15 +193,40 @@ pub enum ShaderPanicStrategy {
/// If you have multiple entry-points, you *may* need to also enable the
/// `multimodule` node (see <https://github.com/KhronosGroup/SPIRV-Tools/issues/4892>).
///
/// **Note**: actually obtaining the `debugPrintf` output requires enabling:
/// * `VK_KHR_shader_non_semantic_info` Vulkan *Device* extension
/// * Vulkan Validation Layers (which contain the `debugPrintf` implementation)
/// * `VK_VALIDATION_FEATURE_ENABLE_DEBUG_PRINTF_EXT` in Validation Layers,
/// either by using `VkValidationFeaturesEXT` during instance creating,
/// setting the `VK_LAYER_ENABLES` environment variable to that value,
/// or adding it to `khronos_validation.enables` in `vk_layer_settings.txt`
///
/// See also: <https://github.com/KhronosGroup/Vulkan-ValidationLayers/blob/main/docs/debug_printf.md>.
/// **Note**: actually obtaining the `debugPrintf` output requires:
/// * Vulkan Validation Layers (from e.g. the Vulkan SDK)
/// * (they contain the `debugPrintf` implementation, a SPIR-V -> SPIR-V translation)
/// * **set the `VK_LOADER_LAYERS_ENABLE=VK_LAYER_KHRONOS_validation`
/// environment variable** to easily enable them without any code changes
/// * alternatively, `"VK_LAYER_KHRONOS_validation"` can be passed during
/// instance creation, to enable them programmatically
/// * Validation Layers' `debugPrintf` support:
/// * **set the `VK_LAYER_ENABLES=VK_VALIDATION_FEATURE_ENABLE_DEBUG_PRINTF_EXT`
/// environment variable** to easily enable the `debugPrintf` support
/// * alternatively, `VkValidationFeaturesEXT` during instance creation,
/// or the `khronos_validation.enables` field in `vk_layer_settings.txt`,
/// can be used to enable `VK_VALIDATION_FEATURE_ENABLE_DEBUG_PRINTF_EXT`
/// (see also <https://github.com/KhronosGroup/Vulkan-ValidationLayers/blob/main/docs/debug_printf.md>)
/// * for outputting the `debugPrintf` messages sent back from the GPU:
/// * **set the `DEBUG_PRINTF_TO_STDOUT=1` environment variable** if you don't
/// plan on customizing the reporting (see below for alternatives)
/// * for `wgpu`:
/// * **required**: `wgpu::Features::SPIRV_SHADER_PASSTHROUGH` (Naga lacks `debugPrintf`)
/// * *optional*: building in debug mode (and/or with debug-assertions enabled),
/// to enable `wgpu` logging/debug support
/// * (the debug assertions requirement may be lifted in future `wgpu` versions)
/// * this uses `VK_EXT_debug_utils` internally, and is a better-integrated
/// alternative to just setting `DEBUG_PRINTF_TO_STDOUT=1`
/// * `RUST_LOG=wgpu_hal::vulkan=info` (or equivalent) will enable said
/// output (as `debugPrintf` messages have the "info" level)
/// * `RUST_LOG` controls `env_logger`, which isn't itself required,
/// but *some* `log`/`tracing` subscriber is needed to get any output
/// * for Vulkan (e.g. via `ash`):
/// * **required**: enabling the `VK_KHR_shader_non_semantic_info` Vulkan *Device* extension
/// * *optional*: as described above, enabling the Validation Layers and
/// their `debugPrintf` support can be done during instance creation
/// * *optional*: integrating [`VK_EXT_debug_utils`](https://registry.khronos.org/vulkan/specs/1.3-extensions/man/html/VK_EXT_debug_utils.html)
/// allows more reporting flexibility than `DEBUG_PRINTF_TO_STDOUT=1`)
DebugPrintfThenExit {
/// Whether to also print the entry-point inputs (excluding buffers/resources),
/// which should uniquely identify the panicking shader invocation.