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2c60959e2b73d9c6b069c2334cd6fe429d7f3576
omath/examples/example_dx12_hook/dllmain.cpp
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orange 2c60959e2b improved dx12 hook
2026-06-29 14:55:29 +03:00

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#include "omath/hooks/hooks_manager.hpp"
#include <Windows.h>
#include <d3d12.h>
#include <dxgi1_4.h>
#include <imgui.h>
#include <imgui_impl_dx12.h>
#include <imgui_impl_win32.h>
#include <tuple>
#include <vector>
extern IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND, UINT, WPARAM, LPARAM);
bool show_menu = true;
namespace
{
struct frame_context
{
ID3D12Resource* render_target = nullptr;
ID3D12CommandAllocator* command_allocator = nullptr;
D3D12_CPU_DESCRIPTOR_HANDLE rtv_handle = {};
UINT64 fence_value = 0;
};
bool g_initialized = false;
bool g_init_attempted = false;
ID3D12Device* g_device = nullptr;
ID3D12CommandQueue* g_command_queue = nullptr;
IDXGISwapChain3* g_swap_chain = nullptr;
ID3D12DescriptorHeap* g_rtv_heap = nullptr;
ID3D12DescriptorHeap* g_srv_heap = nullptr;
ID3D12GraphicsCommandList* g_command_list = nullptr;
ID3D12Fence* g_fence = nullptr;
HANDLE g_fence_event = nullptr;
UINT64 g_fence_value = 0;
std::vector<frame_context> g_frames;
bool create_sync_objects()
{
if (g_fence)
return true;
if (FAILED(g_device->CreateFence(0, D3D12_FENCE_FLAG_NONE, IID_PPV_ARGS(&g_fence))))
return false;
g_fence_event = CreateEvent(nullptr, FALSE, FALSE, nullptr);
if (!g_fence_event)
{
g_fence->Release();
g_fence = nullptr;
return false;
}
g_fence_value = 0;
return true;
}
bool wait_for_fence_value(UINT64 fence_value)
{
if (!g_fence || !g_fence_event || fence_value == 0 || g_fence->GetCompletedValue() >= fence_value)
return true;
if (FAILED(g_fence->SetEventOnCompletion(fence_value, g_fence_event)))
return false;
WaitForSingleObject(g_fence_event, INFINITE);
return true;
}
void wait_for_frame(frame_context& fc)
{
if (wait_for_fence_value(fc.fence_value))
fc.fence_value = 0;
}
void wait_for_gpu()
{
if (!g_command_queue || !g_fence || !g_fence_event)
return;
const UINT64 fence_value = ++g_fence_value;
if (FAILED(g_command_queue->Signal(g_fence, fence_value)))
return;
if (wait_for_fence_value(fence_value))
{
for (auto& fc : g_frames)
fc.fence_value = 0;
}
}
bool signal_frame(frame_context& fc)
{
if (!g_command_queue || !g_fence)
return false;
const UINT64 fence_value = ++g_fence_value;
if (FAILED(g_command_queue->Signal(g_fence, fence_value)))
return false;
fc.fence_value = fence_value;
return true;
}
void release_sync_objects()
{
if (g_fence_event)
{
CloseHandle(g_fence_event);
g_fence_event = nullptr;
}
if (g_fence)
{
g_fence->Release();
g_fence = nullptr;
}
g_fence_value = 0;
}
void release_frame_contexts()
{
for (auto& fc : g_frames)
{
if (fc.render_target)
{
fc.render_target->Release();
fc.render_target = nullptr;
}
if (fc.command_allocator)
{
fc.command_allocator->Release();
fc.command_allocator = nullptr;
}
fc.fence_value = 0;
}
g_frames.clear();
if (g_rtv_heap)
{
g_rtv_heap->Release();
g_rtv_heap = nullptr;
}
}
void release_command_objects()
{
if (g_command_list)
{
g_command_list->Release();
g_command_list = nullptr;
}
}
bool create_command_objects()
{
if (g_frames.empty() || !g_frames[0].command_allocator)
return false;
if (FAILED(g_device->CreateCommandList(0, D3D12_COMMAND_LIST_TYPE_DIRECT, g_frames[0].command_allocator,
nullptr, IID_PPV_ARGS(&g_command_list))))
{
release_command_objects();
return false;
}
g_command_list->Close();
return true;
}
bool create_render_targets(IDXGISwapChain* swap_chain)
{
DXGI_SWAP_CHAIN_DESC desc{};
if (FAILED(swap_chain->GetDesc(&desc)))
return false;
const UINT buffer_count = desc.BufferCount;
D3D12_DESCRIPTOR_HEAP_DESC heap_desc{};
heap_desc.Type = D3D12_DESCRIPTOR_HEAP_TYPE_RTV;
heap_desc.NumDescriptors = buffer_count;
heap_desc.Flags = D3D12_DESCRIPTOR_HEAP_FLAG_NONE;
heap_desc.NodeMask = 1;
if (FAILED(g_device->CreateDescriptorHeap(&heap_desc, IID_PPV_ARGS(&g_rtv_heap))))
return false;
g_frames.resize(buffer_count);
const UINT rtv_size = g_device->GetDescriptorHandleIncrementSize(D3D12_DESCRIPTOR_HEAP_TYPE_RTV);
D3D12_CPU_DESCRIPTOR_HANDLE rtv_handle = g_rtv_heap->GetCPUDescriptorHandleForHeapStart();
for (UINT i = 0; i < buffer_count; ++i)
{
g_frames[i].rtv_handle = rtv_handle;
if (FAILED(g_device->CreateCommandAllocator(D3D12_COMMAND_LIST_TYPE_DIRECT,
IID_PPV_ARGS(&g_frames[i].command_allocator))))
{
release_frame_contexts();
return false;
}
if (FAILED(swap_chain->GetBuffer(i, IID_PPV_ARGS(&g_frames[i].render_target))))
{
release_frame_contexts();
return false;
}
g_device->CreateRenderTargetView(g_frames[i].render_target, nullptr, rtv_handle);
rtv_handle.ptr += rtv_size;
}
return true;
}
void init(IDXGISwapChain* swap_chain)
{
g_init_attempted = true;
if (FAILED(swap_chain->QueryInterface(IID_PPV_ARGS(&g_swap_chain))))
return;
if (FAILED(swap_chain->GetDevice(IID_PPV_ARGS(&g_device))))
return;
DXGI_SWAP_CHAIN_DESC desc{};
swap_chain->GetDesc(&desc);
const UINT buffer_count = desc.BufferCount;
{
D3D12_DESCRIPTOR_HEAP_DESC heap_desc{};
heap_desc.Type = D3D12_DESCRIPTOR_HEAP_TYPE_CBV_SRV_UAV;
heap_desc.NumDescriptors = buffer_count;
heap_desc.Flags = D3D12_DESCRIPTOR_HEAP_FLAG_SHADER_VISIBLE;
if (FAILED(g_device->CreateDescriptorHeap(&heap_desc, IID_PPV_ARGS(&g_srv_heap))))
return;
}
if (!create_render_targets(swap_chain))
return;
if (!create_command_objects())
return;
if (!create_sync_objects())
return;
ImGui::CreateContext();
ImGui::StyleColorsDark();
ImGui::GetIO().IniFilename = nullptr;
ImGui::GetIO().LogFilename = nullptr;
ImGui::GetIO().ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
ImGui_ImplWin32_Init(desc.OutputWindow);
ImGui_ImplDX12_Init(g_device, static_cast<int>(buffer_count), desc.BufferDesc.Format, g_srv_heap,
g_srv_heap->GetCPUDescriptorHandleForHeapStart(),
g_srv_heap->GetGPUDescriptorHandleForHeapStart());
ImGui_ImplDX12_CreateDeviceObjects();
auto& mgr = omath::hooks::HooksManager::get();
mgr.set_on_wnd_proc(
[](HWND h, UINT msg, WPARAM wp, LPARAM lp) -> std::optional<LRESULT>
{
if (!show_menu)
return std::nullopt;
ImGui_ImplWin32_WndProcHandler(h, msg, wp, lp);
return true;
});
std::ignore = mgr.hook_wnd_proc(desc.OutputWindow);
g_initialized = true;
}
void on_execute_command_lists(ID3D12CommandQueue* queue, UINT, ID3D12CommandList* const*)
{
if (!g_command_queue)
{
const D3D12_COMMAND_QUEUE_DESC desc = queue->GetDesc();
if (desc.Type == D3D12_COMMAND_LIST_TYPE_DIRECT)
g_command_queue = queue;
}
}
void on_present(IDXGISwapChain* swap_chain, UINT, UINT)
{
if (!g_initialized)
{
if (!g_init_attempted && g_command_queue)
init(swap_chain);
return;
}
if (!g_command_queue)
return;
if (g_frames.empty() || !g_rtv_heap)
{
if (!create_render_targets(swap_chain))
return;
}
if (!g_command_list)
{
if (!create_command_objects())
return;
}
if (!g_fence)
{
if (!create_sync_objects())
return;
}
if (GetAsyncKeyState(VK_INSERT) & 1)
show_menu = !show_menu;
if (!show_menu)
return;
ImGui_ImplDX12_NewFrame();
ImGui_ImplWin32_NewFrame();
ImGui::NewFrame();
ImGui::GetIO().MouseDrawCursor = true;
ImGui::ShowDemoWindow();
ImGui::EndFrame();
const UINT buf_idx = g_swap_chain->GetCurrentBackBufferIndex();
if (buf_idx >= g_frames.size())
return;
auto& fc = g_frames[buf_idx];
wait_for_frame(fc);
if (FAILED(fc.command_allocator->Reset()))
return;
if (FAILED(g_command_list->Reset(fc.command_allocator, nullptr)))
return;
D3D12_RESOURCE_BARRIER barrier{};
barrier.Type = D3D12_RESOURCE_BARRIER_TYPE_TRANSITION;
barrier.Flags = D3D12_RESOURCE_BARRIER_FLAG_NONE;
barrier.Transition.pResource = fc.render_target;
barrier.Transition.Subresource = D3D12_RESOURCE_BARRIER_ALL_SUBRESOURCES;
barrier.Transition.StateBefore = D3D12_RESOURCE_STATE_PRESENT;
barrier.Transition.StateAfter = D3D12_RESOURCE_STATE_RENDER_TARGET;
g_command_list->ResourceBarrier(1, &barrier);
g_command_list->OMSetRenderTargets(1, &fc.rtv_handle, FALSE, nullptr);
g_command_list->SetDescriptorHeaps(1, &g_srv_heap);
ImGui::Render();
ImGui_ImplDX12_RenderDrawData(ImGui::GetDrawData(), g_command_list);
barrier.Transition.StateBefore = D3D12_RESOURCE_STATE_RENDER_TARGET;
barrier.Transition.StateAfter = D3D12_RESOURCE_STATE_PRESENT;
g_command_list->ResourceBarrier(1, &barrier);
if (FAILED(g_command_list->Close()))
return;
ID3D12CommandList* cmd_lists[] = {g_command_list};
g_command_queue->ExecuteCommandLists(1, cmd_lists);
std::ignore = signal_frame(fc);
}
void on_resize_buffers(IDXGISwapChain*, UINT, UINT, UINT, DXGI_FORMAT, UINT)
{
wait_for_gpu();
release_command_objects();
release_frame_contexts();
}
void release_dx12_resources()
{
wait_for_gpu();
release_command_objects();
release_frame_contexts();
release_sync_objects();
if (g_srv_heap)
{
g_srv_heap->Release();
g_srv_heap = nullptr;
}
if (g_swap_chain)
{
g_swap_chain->Release();
g_swap_chain = nullptr;
}
if (g_device)
{
g_device->Release();
g_device = nullptr;
}
}
} // namespace
BOOL WINAPI DllMain(HINSTANCE h_instance, DWORD reason, LPVOID)
{
if (reason == DLL_PROCESS_ATTACH)
{
DisableThreadLibraryCalls(h_instance);
CreateThread(
nullptr, 0,
[](LPVOID) -> DWORD
{
while (!GetModuleHandle("d3d12.dll"))
Sleep(100);
auto& mgr = omath::hooks::HooksManager::get();
mgr.set_on_present(on_present);
mgr.set_on_resize_buffers(on_resize_buffers);
mgr.set_on_execute_command_lists(on_execute_command_lists);
std::ignore = mgr.hook_dx12();
return 0;
},
nullptr, 0, nullptr);
}
else if (reason == DLL_PROCESS_DETACH)
{
auto& mgr = omath::hooks::HooksManager::get();
mgr.unhook_wnd_proc();
mgr.unhook_dx12();
if (g_initialized)
{
ImGui_ImplDX12_Shutdown();
ImGui_ImplWin32_Shutdown();
ImGui::DestroyContext();
}
release_dx12_resources();
}
return TRUE;
}
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