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Add OpenGL capture path for the hooked video mirror

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The Present hook never fired in Phantom Brave because it's an OpenGL game
(OPENGL32.dll loaded, IDXGISwapChain::Present calls=0), so the hooked video source
showed no image. Add an OpenGL producer under the video subsystem: inline-hook
gdi32!SwapBuffers + opengl32!wglSwapBuffers (with a re-entrancy guard, since
SwapBuffers calls wglSwapBuffers), glReadPixels the backbuffer, flip it, and upload
it into the same shared keyed-mutex texture the host already samples -- so the host
is unchanged. DXGI games still hit the Present hook; both producers are installed
and whichever the game uses fills the texture.

Validated by opengl_hook_test (real GL context, clears to a known color, reads the
exact pixels back through the shared texture) and against Phantom Brave (SwapBuffers
~75/s, present=0, shared texture 1920x1080, generation advancing). Vulkan
(vkQueuePresentKHR) still needs WGC -- documented. All 7 tests pass.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
BlackMark
2026-06-20 14:33:47 +02:00
parent 914dba4d25
commit 9977ad5d5a
7 changed files with 649 additions and 18 deletions
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16
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 "opengl_hook.hpp"
#include "present_hook.hpp"
#include "xinput_hook.hpp"
@@ -122,22 +123,28 @@ DWORD WINAPI worker_thread(LPVOID)
coop::hook::logf("worker_thread: audio hooks removed (host request)");
}
// --- Video (Present-hook) ---
// --- Video (Present hook + OpenGL swap hook) ---
// Opt-in alternative to the host's WGC path; the host enables it on request.
// Install both producers: DXGI games hit the Present hook, OpenGL games hit
// the SwapBuffers hook, whichever the game uses fills the shared texture.
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);
const bool present_ok = coop::hook::install_present_hooks(g_ipc);
const bool gl_ok = coop::hook::install_opengl_hooks(g_ipc);
video_installed = present_ok || gl_ok;
if (video_installed)
{
coop::hook::logf("worker_thread: present hook installed");
coop::hook::logf("worker_thread: video hooks installed (present=%d opengl=%d)",
present_ok ? 1 : 0, gl_ok ? 1 : 0);
}
}
else if (!want_video && video_installed)
{
coop::hook::remove_present_hooks();
coop::hook::remove_opengl_hooks();
video_installed = false;
coop::hook::logf("worker_thread: present hook removed (host request)");
coop::hook::logf("worker_thread: video hooks removed (host request)");
}
if (audio_installed && !audio_ring_open)
@@ -206,6 +213,7 @@ BOOL APIENTRY DllMain(HMODULE module, DWORD reason, LPVOID reserved)
coop::hook::remove_xinput_hooks();
coop::hook::remove_audio_hooks();
coop::hook::remove_present_hooks();
coop::hook::remove_opengl_hooks();
coop::hook::hook_registry_reset();
}
break;