ImClass/directx.h at main · codabro/ImClass · GitHub

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#pragma once

#include <d3d11.h>
#include <imgui/imgui.h>
#include <imgui/backends/imgui_impl_win32.h>
#include <imgui/backends/imgui_impl_dx11.h>

#pragma comment(lib, "d3d11.lib")

IDXGISwapChain* g_pSwapChain = 0;
ID3D11Device* g_pd3dDevice = 0;
ID3D11DeviceContext* g_pd3dDeviceContext = 0;
ID3D11RenderTargetView* g_mainRenderTargetView = 0;

void CreateRenderTarget() {
    ID3D11Texture2D* pBackBuffer = 0;
    g_pSwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer));
    if (pBackBuffer) {
        g_pd3dDevice->CreateRenderTargetView(pBackBuffer, 0, &g_mainRenderTargetView);
        pBackBuffer->Release();
    }
}

void CleanupRenderTarget() {
    if (g_mainRenderTargetView) {
        g_mainRenderTargetView->Release();
        g_mainRenderTargetView = 0;
    }
}

bool CreateDeviceD3D(HWND hWnd) {
    DXGI_SWAP_CHAIN_DESC sd;
    ZeroMemory(&sd, sizeof(sd));
    sd.BufferCount = 1;
    sd.BufferDesc.Width = 500;
    sd.BufferDesc.Height = 500;
    sd.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
    sd.BufferDesc.RefreshRate.Numerator = 0;
    sd.BufferDesc.RefreshRate.Denominator = 1;
    sd.Flags = DXGI_SWAP_CHAIN_FLAG_ALLOW_MODE_SWITCH;
    sd.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
    sd.OutputWindow = hWnd;
    sd.SampleDesc.Count = 1;
    sd.SampleDesc.Quality = 0;
    sd.Windowed = TRUE;
    sd.SwapEffect = DXGI_SWAP_EFFECT_DISCARD;

    UINT createDeviceFlags = 0;
    D3D_FEATURE_LEVEL featureLevel;
    const D3D_FEATURE_LEVEL featureLevelArray[2] = { D3D_FEATURE_LEVEL_11_0, D3D_FEATURE_LEVEL_10_0 };
    if (D3D11CreateDeviceAndSwapChain(NULL, D3D_DRIVER_TYPE_HARDWARE, NULL, createDeviceFlags, featureLevelArray, 2, D3D11_SDK_VERSION, &sd, &g_pSwapChain, &g_pd3dDevice, &featureLevel, &g_pd3dDeviceContext) != S_OK) {
        return false;
    }

    CreateRenderTarget();
    return true;
}

void CleanupDeviceD3D() {
    CleanupRenderTarget();
    if (g_pSwapChain) { g_pSwapChain->Release(); g_pSwapChain = nullptr; }
    if (g_pd3dDeviceContext) { g_pd3dDeviceContext->Release(); g_pd3dDeviceContext = nullptr; }
    if (g_pd3dDevice) { g_pd3dDevice->Release(); g_pd3dDevice = nullptr; }
}

extern IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam) {
    if (ImGui_ImplWin32_WndProcHandler(hWnd, msg, wParam, lParam)) {
        return true;
    }

    switch (msg) {
    case WM_SIZE:
        if (g_pd3dDevice != NULL && wParam != SIZE_MINIMIZED)
        {
            CleanupRenderTarget();
            g_pSwapChain->ResizeBuffers(0, (UINT)LOWORD(lParam), (UINT)HIWORD(lParam), DXGI_FORMAT_UNKNOWN, 0);
            CreateRenderTarget();
        }
        return 0;
    case WM_SYSCOMMAND:
        if ((wParam & 0xfff0) == SC_KEYMENU) {
            return 0;
        }
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }

    return DefWindowProc(hWnd, msg, wParam, lParam);
}