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Backends: DirectX11: configure swap chain creation for secondary viewports via undocumented ImGui_ImplDX11_SetSwapChainDescs(). (#5437, #7607, #7286, #2970)

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ocornut 2025-02-21 23:51:30 +01:00 committed by ocornut
parent 3064e6d10c
commit dd89bb1469
1 changed files with 40 additions and 17 deletions
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57
backends/imgui_impl_dx11.cpp
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@ -18,6 +18,7 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2025-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
// 2025-02-24: [Docking] Added undocumented ImGui_ImplDX11_SetSwapChainDescs() to configure swap chain creation for secondary viewports.
// 2025-01-06: DirectX11: Expose VertexConstantBuffer in ImGui_ImplDX11_RenderState. Reset projection matrix in ImDrawCallback_ResetRenderState handler.
// 2024-10-07: DirectX11: Changed default texture sampler to Clamp instead of Repeat/Wrap.
// 2024-10-07: DirectX11: Expose selected render state in ImGui_ImplDX11_RenderState, which you can access in 'void* platform_io.Renderer_RenderState' during draw callbacks.
@ -70,6 +71,7 @@ struct ImGui_ImplDX11_Data
ID3D11DepthStencilState* pDepthStencilState;
int VertexBufferSize;
int IndexBufferSize;
ImVector<DXGI_SWAP_CHAIN_DESC> SwapChainDescsForViewports;
ImGui_ImplDX11_Data() { memset((void*)this, 0, sizeof(*this)); VertexBufferSize = 5000; IndexBufferSize = 10000; }
};
@ -652,6 +654,16 @@ struct ImGui_ImplDX11_ViewportData
~ImGui_ImplDX11_ViewportData() { IM_ASSERT(SwapChain == nullptr && RTView == nullptr); }
};
// Multi-Viewports: configure templates used when creating swapchains for secondary viewports. Will try them in order.
// This is intentionally not declared in the .h file yet, so you will need to copy this declaration:
void ImGui_ImplDX11_SetSwapChainDescs(const DXGI_SWAP_CHAIN_DESC* desc_templates, int desc_templates_count);
void ImGui_ImplDX11_SetSwapChainDescs(const DXGI_SWAP_CHAIN_DESC* desc_templates, int desc_templates_count)
{
ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
bd->SwapChainDescsForViewports.resize(desc_templates_count);
memcpy(bd->SwapChainDescsForViewports.Data, desc_templates, sizeof(DXGI_SWAP_CHAIN_DESC));
}
static void ImGui_ImplDX11_CreateWindow(ImGuiViewport* viewport)
{
ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
@ -662,27 +674,25 @@ static void ImGui_ImplDX11_CreateWindow(ImGuiViewport* viewport)
// Some backends will leave PlatformHandleRaw == 0, in which case we assume PlatformHandle will contain the HWND.
HWND hwnd = viewport->PlatformHandleRaw ? (HWND)viewport->PlatformHandleRaw : (HWND)viewport->PlatformHandle;
IM_ASSERT(hwnd != 0);
IM_ASSERT(vd->SwapChain == nullptr && vd->RTView == nullptr);
// Create swap chain
DXGI_SWAP_CHAIN_DESC sd;
ZeroMemory(&sd, sizeof(sd));
sd.BufferDesc.Width = (UINT)viewport->Size.x;
sd.BufferDesc.Height = (UINT)viewport->Size.y;
sd.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
sd.SampleDesc.Count = 1;
sd.SampleDesc.Quality = 0;
sd.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
sd.BufferCount = 1;
sd.OutputWindow = hwnd;
sd.Windowed = TRUE;
sd.SwapEffect = DXGI_SWAP_EFFECT_DISCARD;
sd.Flags = 0;
IM_ASSERT(vd->SwapChain == nullptr && vd->RTView == nullptr);
bd->pFactory->CreateSwapChain(bd->pd3dDevice, &sd, &vd->SwapChain);
HRESULT hr = DXGI_ERROR_UNSUPPORTED;
for (const DXGI_SWAP_CHAIN_DESC& sd_template : bd->SwapChainDescsForViewports)
{
IM_ASSERT(sd_template.BufferDesc.Width == 0 && sd_template.BufferDesc.Height == 0 && sd_template.OutputWindow == nullptr);
DXGI_SWAP_CHAIN_DESC sd = sd_template;
sd.BufferDesc.Width = (UINT)viewport->Size.x;
sd.BufferDesc.Height = (UINT)viewport->Size.y;
sd.OutputWindow = hwnd;
hr = bd->pFactory->CreateSwapChain(bd->pd3dDevice, &sd, &vd->SwapChain);
if (SUCCEEDED(hr))
break;
}
IM_ASSERT(SUCCEEDED(hr));
// Create the render target
if (vd->SwapChain)
if (vd->SwapChain != nullptr)
{
ID3D11Texture2D* pBackBuffer;
vd->SwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer));
@ -752,6 +762,19 @@ static void ImGui_ImplDX11_InitMultiViewportSupport()
platform_io.Renderer_SetWindowSize = ImGui_ImplDX11_SetWindowSize;
platform_io.Renderer_RenderWindow = ImGui_ImplDX11_RenderWindow;
platform_io.Renderer_SwapBuffers = ImGui_ImplDX11_SwapBuffers;
// Default swapchain format
DXGI_SWAP_CHAIN_DESC sd;
ZeroMemory(&sd, sizeof(sd));
sd.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
sd.SampleDesc.Count = 1;
sd.SampleDesc.Quality = 0;
sd.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
sd.BufferCount = 1;
sd.Windowed = TRUE;
sd.SwapEffect = DXGI_SWAP_EFFECT_DISCARD;
sd.Flags = 0;
ImGui_ImplDX11_SetSwapChainDescs(&sd, 1);
}
static void ImGui_ImplDX11_ShutdownMultiViewportSupport()