Function EndFrame

SampleFramework12/v1.00/ImGuiHelper.cpp:223–322

}

void EndFrame(ID3D12GraphicsCommandList* cmdList, D3D12_CPU_DESCRIPTOR_HANDLE rtv, uint32 displayWidth, uint32 displayHeight)
{
    Assert_(CurrBeginFrame == DX12::CurrentCPUFrame);
    Assert_(CurrEndFrame != DX12::CurrentCPUFrame);

    ImGui::Render();

    PIXMarker pixMarker(cmdList, "ImGui Rendering");

    ImDrawData* drawData = ImGui::GetDrawData();

    // Get memory for vertex and index buffers
    const uint64 vbSize = sizeof(ImDrawVert) * drawData->TotalVtxCount;
    const uint64 ibSize = sizeof(ImDrawIdx) * drawData->TotalIdxCount;
    MapResult vertexMem = DX12::AcquireTempBufferMem(vbSize, 4);
    MapResult indexMem = DX12::AcquireTempBufferMem(ibSize, 4);

    // Copy and convert all vertices into a single contiguous buffer
    ImDrawVert* vertexCPUMem = reinterpret_cast<ImDrawVert*>(vertexMem.CPUAddress);
    ImDrawIdx* indexCPUMem = reinterpret_cast<ImDrawIdx*>(indexMem.CPUAddress);
    for(uint64 i = 0; i < drawData->CmdListsCount; i++)
    {
        const ImDrawList* drawList = drawData->CmdLists[i];
        memcpy(vertexCPUMem, &drawList->VtxBuffer[0], drawList->VtxBuffer.size() * sizeof(ImDrawVert));
        memcpy(indexCPUMem, &drawList->IdxBuffer[0], drawList->IdxBuffer.size() * sizeof(ImDrawIdx));
        vertexCPUMem += drawList->VtxBuffer.size();
        indexCPUMem += drawList->IdxBuffer.size();
    }

    // Setup orthographic projection matrix into our constant buffer
    {
        const float L = 0.0f;
        const float R = float(displayWidth);
        const float B = float(displayHeight);
        const float T = 0.0f;

        CBuffer.Data.ProjectionMatrix = Float4x4(Float4(2.0f/(R-L),   0.0f,           0.0f,       0.0f),
                                                 Float4(0.0f,         2.0f/(T-B),     0.0f,       0.0f),
                                                 Float4(0.0f,         0.0f,           0.5f,       0.0f),
                                                 Float4((R+L)/(L-R),  (T+B)/(B-T),    0.5f,       1.0f));

        CBuffer.Upload();
    }

    // Setup viewport
    DX12::SetViewport(cmdList, displayWidth, displayHeight);

    cmdList->OMSetRenderTargets(1, &rtv, false, nullptr);

    // Bind shader and vertex buffers
    cmdList->SetPipelineState(PSO);
    cmdList->SetGraphicsRootSignature(RootSignature);
    cmdList->IASetPrimitiveTopology(D3D_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
    CBuffer.SetAsGfxRootParameter(cmdList, 1);

    D3D12_VERTEX_BUFFER_VIEW vbView = { };
    vbView.BufferLocation = vertexMem.GPUAddress;
    vbView.SizeInBytes = uint32(vbSize);