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First phase of design/vulkan-rgb-direct-encode.md (punktfunk-planning): make the captured BGRx dmabuf the direct encode source with the VCN EFC front-end doing the 709-narrow CSC — deleting the per-frame compute CSC, both plane copies, the semaphore hop and one queue submit. B0 changes nothing about the encode path. It vendors the extension surface (vk_valve_rgb.rs — ash 0.38 predates it; same rationale and style as the vk_av1_encode module) and probes at open whether this host qualifies: extension present (Mesa >= 26.0 + EFC hardware) → feature bit → conversion caps cover the compute shader's exact math (709 / narrow / midpoint both axes) → encode-src format set offers B8G8R8A8 with DRM-modifier tiling. The verdict is one INFO line (rgb_direct=available | first missing requirement) — the field telemetry that decides where B1 can default on. Verified: cargo check + clippy clean + unit tests green (Linux box); the probe short-circuits to no-ext on non-RADV drivers. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
83 lines
3.3 KiB
Rust
83 lines
3.3 KiB
Rust
//! Vendored `VK_VALVE_video_encode_rgb_conversion` bindings — the RGB→YCbCr encode-source
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//! extension (Vulkan 1.4.327; RADV since Mesa 26.0, hardware-gated on the VCN EFC front-end
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//! conversion block). Our pinned `ash 0.38.0+1.3.281` predates it entirely; same vendoring
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//! rationale as [`vk_av1_encode`](super::vk_av1_encode) — definitions copied from the registry
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//! so the layouts are correct-by-construction, chained via raw `p_next`. Consumed by
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//! `vulkan_video.rs`: B0 probes + logs availability (design/vulkan-rgb-direct-encode.md);
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//! B1 makes the captured BGRx dmabuf the direct encode source with EFC doing the 709-narrow CSC.
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#![allow(dead_code)]
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use ash::vk;
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use std::ffi::{c_void, CStr};
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pub const EXTENSION_NAME: &CStr = c"VK_VALVE_video_encode_rgb_conversion";
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// ---------- struct-type (VkStructureType) values — construct via `stype` ----------
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pub const ST_PHYSICAL_DEVICE_FEATURES: i32 = 1_000_390_000;
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pub const ST_CAPABILITIES: i32 = 1_000_390_001;
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pub const ST_PROFILE_INFO: i32 = 1_000_390_002;
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pub const ST_SESSION_CREATE_INFO: i32 = 1_000_390_003;
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// `VkVideoEncodeRgbModelConversionFlagBitsVALVE`
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pub const MODEL_RGB_IDENTITY: u32 = 0x01;
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pub const MODEL_YCBCR_IDENTITY: u32 = 0x02;
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pub const MODEL_YCBCR_709: u32 = 0x04;
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pub const MODEL_YCBCR_601: u32 = 0x08;
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pub const MODEL_YCBCR_2020: u32 = 0x10;
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// `VkVideoEncodeRgbRangeCompressionFlagBitsVALVE`
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pub const RANGE_FULL: u32 = 0x01;
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pub const RANGE_NARROW: u32 = 0x02;
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// `VkVideoEncodeRgbChromaOffsetFlagBitsVALVE`
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pub const CHROMA_OFFSET_COSITED_EVEN: u32 = 0x01;
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pub const CHROMA_OFFSET_MIDPOINT: u32 = 0x02;
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/// `VkPhysicalDeviceVideoEncodeRgbConversionFeaturesVALVE` — chain into
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/// `VkPhysicalDeviceFeatures2` (query) / `VkDeviceCreateInfo` (enable).
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#[repr(C)]
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pub struct PhysicalDeviceVideoEncodeRgbConversionFeaturesVALVE {
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pub s_type: vk::StructureType,
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pub p_next: *mut c_void,
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pub video_encode_rgb_conversion: vk::Bool32,
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}
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/// `VkVideoEncodeRgbConversionCapabilitiesVALVE` — chain into the
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/// `vkGetPhysicalDeviceVideoCapabilitiesKHR` output when the queried profile carries
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/// [`VideoEncodeProfileRgbConversionInfoVALVE`]; reports which conversions the HW does.
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#[repr(C)]
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pub struct VideoEncodeRgbConversionCapabilitiesVALVE {
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pub s_type: vk::StructureType,
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pub p_next: *mut c_void,
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pub rgb_models: u32,
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pub rgb_ranges: u32,
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pub x_chroma_offsets: u32,
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pub y_chroma_offsets: u32,
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}
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/// `VkVideoEncodeProfileRgbConversionInfoVALVE` — part of the video-profile *identity*: every
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/// consumer of the profile (caps query, format query, session, image profile lists) must carry
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/// the same chain.
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#[repr(C)]
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pub struct VideoEncodeProfileRgbConversionInfoVALVE {
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pub s_type: vk::StructureType,
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pub p_next: *const c_void,
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pub perform_encode_rgb_conversion: vk::Bool32,
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}
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/// `VkVideoEncodeSessionRgbConversionCreateInfoVALVE` — chain into
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/// `VkVideoSessionCreateInfoKHR`; single-bit selections of the conversion actually performed.
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#[repr(C)]
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pub struct VideoEncodeSessionRgbConversionCreateInfoVALVE {
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pub s_type: vk::StructureType,
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pub p_next: *const c_void,
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pub rgb_model: u32,
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pub rgb_range: u32,
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pub x_chroma_offset: u32,
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pub y_chroma_offset: u32,
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}
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/// `vk::StructureType` for a raw `ST_*` constant above.
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#[inline]
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pub fn stype(raw: i32) -> vk::StructureType {
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vk::StructureType::from_raw(raw)
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}
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