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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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6
host/src/injection_panel.cpp
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@@ -96,6 +96,7 @@ void InjectionPanel::inject_selected()
server_.set_subsystem_enabled(HookSubsys_Input, want_input_);
server_.set_subsystem_enabled(HookSubsys_Focus, want_focus_);
server_.set_subsystem_enabled(HookSubsys_Audio, want_audio_);
server_.set_subsystem_enabled(HookSubsys_Video, want_video_);
const InjectResult result = inject_dll(selected_pid_, hook_dll_path());
if (result.status == InjectStatus::Ok)
@@ -147,7 +148,7 @@ void InjectionPanel::publish(const std::array<PadInfo, kMaxPads>& pads)
void InjectionPanel::draw_hook_list(const HookStatusView& status)
{
static const char* kSubsysName[] = {"Input", "Focus", "Audio"};
static const char* kSubsysName[] = {"Input", "Focus", "Audio", "Video"};
const std::uint32_t n = status.hook_entry_count < kMaxHookEntries ? status.hook_entry_count : kMaxHookEntries;
if (n == 0)
@@ -181,7 +182,7 @@ void InjectionPanel::draw_hook_list(const HookStatusView& status)
{
ImGui::TableNextRow();
ImGui::TableNextColumn();
ImGui::TextDisabled("%s", kSubsysName[sub < 3 ? sub : 0]);
ImGui::TextDisabled("%s", kSubsysName[sub < HookSubsys_Count ? sub : 0]);
ImGui::TableNextColumn();
ImGui::TableNextColumn();
header_done = true;
@@ -235,6 +236,7 @@ void InjectionPanel::draw_subsystem_controls(const HookStatusView& status)
{"Input forwarding (XInput)", HookSubsys_Input, &want_input_, "controller input reaches the game"},
{"Focus spoof", HookSubsys_Focus, &want_focus_, "the game keeps running unfocused"},
{"Audio render-hook", HookSubsys_Audio, &want_audio_, "audio mirror without echo"},
{"Video Present-hook", HookSubsys_Video, &want_video_, "Video mirror can use the hooked source"},
};
for (const Row& r : rows)