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Backends: DX12: rework legacy path for handling ImGui_ImplDX12_Init() being called with space for a single descriptor.

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ocornut 2024-11-18 15:16:41 +01:00
parent 08400f5be7
commit 142827f7d8
1 changed files with 28 additions and 20 deletions
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48
backends/imgui_impl_dx12.cpp
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@ -72,13 +72,15 @@ struct ImGui_ImplDX12_Data
ID3D12RootSignature* pRootSignature;
ID3D12PipelineState* pPipelineState;
DXGI_FORMAT RTVFormat;
ImGui_ImplDX12_Texture FontTexture;
ID3D12DescriptorHeap* pd3dSrvDescHeap;
UINT numFramesInFlight;
ImGui_ImplDX12_RenderBuffers* pFrameResources;
UINT frameIndex;
ImGui_ImplDX12_Texture FontTexture;
bool LegacySingleDescriptorUsed;
ImGui_ImplDX12_Data() { memset((void*)this, 0, sizeof(*this)); frameIndex = UINT_MAX; }
};
@ -708,10 +710,7 @@ void ImGui_ImplDX12_InvalidateDeviceObjects()
// Free SRV descriptor used by texture
ImGui_ImplDX12_Texture* font_tex = &bd->FontTexture;
#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
if (bd->InitInfo.SrvDescriptorFreeFn != NULL)
#endif
bd->InitInfo.SrvDescriptorFreeFn(&bd->InitInfo, font_tex->hFontSrvCpuDescHandle, font_tex->hFontSrvGpuDescHandle);
bd->InitInfo.SrvDescriptorFreeFn(&bd->InitInfo, font_tex->hFontSrvCpuDescHandle, font_tex->hFontSrvGpuDescHandle);
SafeRelease(font_tex->pTextureResource);
io.Fonts->SetTexID(0); // We copied bd->hFontSrvGpuDescHandle to io.Fonts->TexID so let's clear that as well.
@ -731,8 +730,9 @@ bool ImGui_ImplDX12_Init(ImGui_ImplDX12_InitInfo* init_info)
// Setup backend capabilities flags
ImGui_ImplDX12_Data* bd = IM_NEW(ImGui_ImplDX12_Data)();
bd->InitInfo = *init_info; // Deep copy
init_info = &bd->InitInfo;
bd->pd3dDevice = init_info->Device;
bd->RTVFormat = init_info->RTVFormat;
bd->numFramesInFlight = init_info->NumFramesInFlight;
@ -742,23 +742,31 @@ bool ImGui_ImplDX12_Init(ImGui_ImplDX12_InitInfo* init_info)
io.BackendRendererName = "imgui_impl_dx12";
io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset; // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
// Allocate 1 SRV descriptor for the font texture
if (init_info->SrvDescriptorAllocFn != NULL)
{
IM_ASSERT(init_info->SrvDescriptorFreeFn != NULL);
init_info->SrvDescriptorAllocFn(&bd->InitInfo, &bd->FontTexture.hFontSrvCpuDescHandle, &bd->FontTexture.hFontSrvGpuDescHandle);
}
else
{
#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
if (init_info->SrvDescriptorAllocFn == NULL)
{
// Wrap legacy behavior of passing space for a single descriptor
IM_ASSERT(init_info->LegacySingleSrvCpuDescriptor.ptr != 0 && init_info->LegacySingleSrvGpuDescriptor.ptr != 0);
bd->FontTexture.hFontSrvCpuDescHandle = init_info->LegacySingleSrvCpuDescriptor;
bd->FontTexture.hFontSrvGpuDescHandle = init_info->LegacySingleSrvGpuDescriptor;
#else
IM_ASSERT(init_info->SrvDescriptorAllocFn != NULL);
IM_ASSERT(init_info->SrvDescriptorFreeFn != NULL);
#endif
init_info->SrvDescriptorAllocFn = [](ImGui_ImplDX12_InitInfo*, D3D12_CPU_DESCRIPTOR_HANDLE* out_cpu_handle, D3D12_GPU_DESCRIPTOR_HANDLE* out_gpu_handle)
{
ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData();
IM_ASSERT(bd->LegacySingleDescriptorUsed == false);
*out_cpu_handle = bd->InitInfo.LegacySingleSrvCpuDescriptor;
*out_gpu_handle = bd->InitInfo.LegacySingleSrvGpuDescriptor;
bd->LegacySingleDescriptorUsed = true;
};
init_info->SrvDescriptorFreeFn = [](ImGui_ImplDX12_InitInfo*, D3D12_CPU_DESCRIPTOR_HANDLE, D3D12_GPU_DESCRIPTOR_HANDLE)
{
ImGui_ImplDX12_Data* bd = ImGui_ImplDX12_GetBackendData();
IM_ASSERT(bd->LegacySingleDescriptorUsed == true);
bd->LegacySingleDescriptorUsed = false;
};
}
#endif
// Allocate 1 SRV descriptor for the font texture
IM_ASSERT(init_info->SrvDescriptorAllocFn != NULL && init_info->SrvDescriptorFreeFn != NULL);
init_info->SrvDescriptorAllocFn(&bd->InitInfo, &bd->FontTexture.hFontSrvCpuDescHandle, &bd->FontTexture.hFontSrvGpuDescHandle);
// Create buffers with a default size (they will later be grown as needed)
bd->frameIndex = UINT_MAX;