add build system, vendor deps, init stuff

src/platform/platform_win32.cpp

@@ -0,0 +1,135 @@
+#include "platform/platform.h"
+
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+#include <malloc.h>
+
+#include "imgui_impl_win32.h"
+
+extern IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
+
+struct PlatformWindow {
+    HWND    hwnd;
+    bool    should_close;
+    int32_t width;
+    int32_t height;
+};
+
+static PlatformWindow *g_current_window = nullptr;
+
+static LRESULT CALLBACK win32_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_current_window && wparam != SIZE_MINIMIZED) {
+            g_current_window->width  = (int32_t)LOWORD(lparam);
+            g_current_window->height = (int32_t)HIWORD(lparam);
+        }
+        return 0;
+    case WM_CLOSE:
+        if (g_current_window)
+            g_current_window->should_close = true;
+        return 0;
+    case WM_DESTROY:
+        PostQuitMessage(0);
+        return 0;
+    case WM_SYSCOMMAND:
+        if ((wparam & 0xfff0) == SC_KEYMENU)
+            return 0;
+        break;
+    }
+    return DefWindowProcW(hwnd, msg, wparam, lparam);
+}
+
+PlatformWindow *platform_create_window(PlatformWindowDesc *desc)
+{
+    WNDCLASSEXW wc = {};
+    wc.cbSize        = sizeof(wc);
+    wc.style         = CS_CLASSDC;
+    wc.lpfnWndProc   = win32_wndproc;
+    wc.hInstance     = GetModuleHandleW(nullptr);
+    wc.lpszClassName = L"autosample_wc";
+    RegisterClassExW(&wc);
+
+    int screen_w = GetSystemMetrics(SM_CXSCREEN);
+    int screen_h = GetSystemMetrics(SM_CYSCREEN);
+    int x = (screen_w - desc->width) / 2;
+    int y = (screen_h - desc->height) / 2;
+
+    RECT rect = { 0, 0, (LONG)desc->width, (LONG)desc->height };
+    AdjustWindowRect(&rect, WS_OVERLAPPEDWINDOW, FALSE);
+
+    int wchar_count = MultiByteToWideChar(CP_UTF8, 0, desc->title, -1, nullptr, 0);
+    wchar_t *wtitle = (wchar_t *)_malloca(wchar_count * sizeof(wchar_t));
+    MultiByteToWideChar(CP_UTF8, 0, desc->title, -1, wtitle, wchar_count);
+
+    HWND hwnd = CreateWindowExW(
+        0, wc.lpszClassName, wtitle,
+        WS_OVERLAPPEDWINDOW,
+        x, y,
+        rect.right - rect.left,
+        rect.bottom - rect.top,
+        nullptr, nullptr, wc.hInstance, nullptr
+    );
+
+    _freea(wtitle);
+
+    if (!hwnd)
+        return nullptr;
+
+    ShowWindow(hwnd, SW_SHOWDEFAULT);
+    UpdateWindow(hwnd);
+
+    PlatformWindow *window = new PlatformWindow();
+    window->hwnd         = hwnd;
+    window->should_close = false;
+    window->width        = desc->width;
+    window->height       = desc->height;
+
+    g_current_window = window;
+    return window;
+}
+
+void platform_destroy_window(PlatformWindow *window)
+{
+    if (!window) return;
+
+    if (window->hwnd) {
+        DestroyWindow(window->hwnd);
+        UnregisterClassW(L"autosample_wc", GetModuleHandleW(nullptr));
+    }
+
+    if (g_current_window == window)
+        g_current_window = nullptr;
+
+    delete window;
+}
+
+bool platform_poll_events(PlatformWindow *window)
+{
+    MSG msg;
+    while (PeekMessageW(&msg, nullptr, 0, 0, PM_REMOVE)) {
+        TranslateMessage(&msg);
+        DispatchMessageW(&msg);
+        if (msg.message == WM_QUIT) {
+            window->should_close = true;
+        }
+    }
+    return !window->should_close;
+}
+
+void platform_get_size(PlatformWindow *window, int32_t *w, int32_t *h)
+{
+    if (w) *w = window->width;
+    if (h) *h = window->height;
+}
+
+void *platform_get_native_handle(PlatformWindow *window)
+{
+    return (void *)window->hwnd;
+}