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Phase 2: Present-hook video path (shared-texture mirror)

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Add an injected IDXGISwapChain::Present / Present1 hook as a lower-latency,
border-free alternative to WGC. The hook copies the swapchain backbuffer into a
shared keyed-mutex texture (coop_video_<pid>); the host opens it by name and
samples it. New opt-in HookSubsys_Video (protocol v6 -> v7); the Video mirror
panel gains a WGC vs Hooked source toggle that installs/removes the subsystem.

Verified by present_hook_test (drives a real D3D11 swapchain end-to-end and reads
the rendered pixels back through the shared texture) and against Phantom Brave
(D3D9: hook installs cleanly and stays idle, WGC fallback). All 5 tests pass.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
BlackMark
2026-06-20 11:34:12 +02:00
parent 9557b9ca69
commit 36b861d167
21 changed files with 1160 additions and 36 deletions
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25
hook/src/ipc_client.hpp
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@@ -169,6 +169,31 @@ public:
}
}
// --- Present-hook video channel ----------------------------------------
// Record that the game's Present() ran (diagnostic counter, hook is sole writer).
void note_present()
{
if (block_ != nullptr)
{
block_->video.present_calls += 1;
}
}
// Publish that a fresh backbuffer copy is in the shared texture (named
// coop_video_<pid>) with these dimensions/format; bumps the generation the host
// polls. The texture itself is shared out-of-band by name, not through here.
void publish_video_frame(std::uint32_t width, std::uint32_t height, std::uint32_t format)
{
if (block_ != nullptr)
{
block_->video.width = width;
block_->video.height = height;
block_->video.format = format;
block_->video.generation.fetch_add(1, std::memory_order_release);
}
}
// --- Hook registry -----------------------------------------------------
// Publish the installed-hooks table (name / subsystem / installed / calls).