BlackMark 2532ffed56 M2(Vulkan): implicit capture layer (coop_vk_layer) + chain dispatch + env test ...

A real chain-aware Vulkan implicit layer the loader inserts at vkCreateInstance
-- the reliable early-presence path for games that init Vulkan immediately,
which the inline-hook vk_hook can't catch. It intercepts vkCreateInstance /
Device / CreateSwapchainKHR / QueuePresentKHR via proper layer-chain dispatch
and does the same read-back capture (vkCmdCopyImageToBuffer -> swizzle ->
hook-owned D3D11 shared texture, with present-semaphore re-chaining) as vk_hook.

The loader/layer link structs (VkLayer*CreateInfo, VkNegotiateLayerInterface)
aren't in Vulkan-Headers, so they're hand-declared to interface version 2. Key
gotcha found via tracing: the loader tags those link structs with small internal
sType values (LOADER_INSTANCE_CREATE_INFO=47, _DEVICE=48), not the 1000000000
range -- matching the wrong value made the device-chain walk fail.

Scoping: an implicit layer loads into every Vulkan app, so it only *captures*
when COOP_VK_LAYER_FORCE is set (tests) or this process's image matches
%TEMP%\coop_vk_target.txt (the host writes it); otherwise pure pass-through.
mock_game_test registers it via VK_LAYER_PATH/VK_INSTANCE_LAYERS and decodes
frames through it. Ships at the bin root with its JSON manifest.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-06-22 13:24:37 +02:00

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