Menu.cpp

#include "Menu.hpp"
#include "imgui/imgui_impl_dx9.h"
#include "imgui/imgui_impl_win32.h"

LPDIRECT3D9              g_pD3D = nullptr;
LPDIRECT3DDEVICE9        g_pd3dDevice = nullptr;
UINT                     g_ResizeWidth = 0, g_ResizeHeight = 0;
D3DPRESENT_PARAMETERS    g_d3dpp = {};
ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
ImGuiIO& io = ImGui::GetIO();;

void InitMenu(ImGuiIO& io)
{
    bool show_demo_window = true;
    bool show_another_window = false;

    ImGui::SetNextWindowPos(ImVec2(Width, Height), ImGuiCond_Once);
    ImGui::SetNextWindowSize(ImVec2(550, 550));
    ImGui::SetNextWindowBgAlpha(1.0f);
    {
        static float f = 0.0f;
        static int counter = 0;

        ImGui::Begin("Hello, world!", nullptr, ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoScrollbar);

        ImGui::Text("This is some useful text.");
        ImGui::Checkbox("Demo Window", &show_demo_window);
        ImGui::Checkbox("Another Window", &show_another_window);

        ImGui::SliderFloat("float", &f, 0.0f, 1.0f);
        ImGui::ColorEdit3("clear color", (float*)&clear_color);

        if (ImGui::Button("Button"))
            counter++;
        ImGui::SameLine();
        ImGui::Text("counter = %d", counter);

        ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / io.Framerate, io.Framerate);
        ImGui::End();
    }

    if (show_another_window)
    {
        ImGui::Begin("Another Window", &show_another_window);
        ImGui::Text("Hello from another window!");
        if (ImGui::Button("Close Me"))
            show_another_window = false;
        ImGui::End();
    }
}

bool CreateDeviceD3D(HWND hWnd)
{
    if ((g_pD3D = Direct3DCreate9(D3D_SDK_VERSION)) == nullptr)
        return false;

    ZeroMemory(&g_d3dpp, sizeof(g_d3dpp));
    g_d3dpp.Windowed = TRUE;
    g_d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
    g_d3dpp.BackBufferFormat = D3DFMT_UNKNOWN;
    g_d3dpp.EnableAutoDepthStencil = TRUE;
    g_d3dpp.AutoDepthStencilFormat = D3DFMT_D16;
    g_d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_ONE;
    if (g_pD3D->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd, D3DCREATE_HARDWARE_VERTEXPROCESSING, &g_d3dpp, &g_pd3dDevice) < 0)
        return false;

    return true;
}

void CleanupDeviceD3D()
{
    if (g_pd3dDevice) { g_pd3dDevice->Release(); g_pd3dDevice = nullptr; }
    if (g_pD3D) { g_pD3D->Release(); g_pD3D = nullptr; }
}

void ResetDevice()
{
    ImGui_ImplDX9_InvalidateDeviceObjects();
    HRESULT hr = g_pd3dDevice->Reset(&g_d3dpp);
    if (hr == D3DERR_INVALIDCALL)
        IM_ASSERT(0);
    ImGui_ImplDX9_CreateDeviceObjects();
}

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 (wParam == SIZE_MINIMIZED)
            return 0;
        g_ResizeWidth = (UINT)LOWORD(lParam);
        g_ResizeHeight = (UINT)HIWORD(lParam);
        return 0;
    case WM_SYSCOMMAND:
        if ((wParam & 0xfff0) == SC_KEYMENU)
            return 0;
        break;
    case WM_DESTROY:
        ::PostQuitMessage(0);
        return 0;
    }
    return ::DefWindowProcW(hWnd, msg, wParam, lParam);
}