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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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21
hook/src/dllmain.cpp
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@@ -20,6 +20,7 @@
#include "focus_spoof.hpp"
#include "hook_registry.hpp"
#include "ipc_client.hpp"
#include "present_hook.hpp"
#include "xinput_hook.hpp"
namespace
@@ -68,6 +69,7 @@ DWORD WINAPI worker_thread(LPVOID)
bool focus_installed = false;
bool audio_installed = false;
bool audio_ring_open = false;
bool video_installed = false;
// Each tick, reconcile each subsystem with the host's requested state: install
// what's wanted but missing (modules / the game window may appear lazily) and
@@ -120,6 +122,24 @@ DWORD WINAPI worker_thread(LPVOID)
coop::hook::logf("worker_thread: audio hooks removed (host request)");
}
// --- Video (Present-hook) ---
// Opt-in alternative to the host's WGC path; the host enables it on request.
const bool want_video = g_ipc.subsystem_install_requested(coop::HookSubsys_Video);
if (want_video && !video_installed)
{
video_installed = coop::hook::install_present_hooks(g_ipc);
if (video_installed)
{
coop::hook::logf("worker_thread: present hook installed");
}
}
else if (!want_video && video_installed)
{
coop::hook::remove_present_hooks();
video_installed = false;
coop::hook::logf("worker_thread: present hook removed (host request)");
}
if (audio_installed && !audio_ring_open)
{
const std::wstring name = coop::audio_ring_name(GetCurrentProcessId());
@@ -185,6 +205,7 @@ BOOL APIENTRY DllMain(HMODULE module, DWORD reason, LPVOID reserved)
coop::hook::remove_focus_spoof();
coop::hook::remove_xinput_hooks();
coop::hook::remove_audio_hooks();
coop::hook::remove_present_hooks();
coop::hook::hook_registry_reset();
}
break;