Add OpenGL capture path for the hooked video mirror

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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hook/CMakeLists.txt
									
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				@@ -4,6 +4,7 @@ add_library(coop_hook SHARED

					src/focus_spoof.cpp

					src/audio_hook.cpp

					src/present_hook.cpp

					src/opengl_hook.cpp

					src/debug_log.cpp

					src/hook_registry.cpp)

Add OpenGL capture path for the hooked video mirror

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hook/CMakeLists.txt

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