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This commit is contained in:
wcjbr
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// Minimal GLFW-compatible Win32 backend for cross-compiling the example.
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// It implements only the subset used by src/render.cpp.
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#include <windows.h>
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#include <windowsx.h>
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#include <array>
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#include <cstdint>
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#include <vector>
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#define GLFW_INCLUDE_VULKAN
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#define VK_USE_PLATFORM_WIN32_KHR
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#include <GLFW/glfw3.h>
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#include <vulkan/vulkan.h>
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#include <vulkan/vulkan_win32.h>
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struct GLFWwindow {
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HWND handle = nullptr;
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void* user_pointer = nullptr;
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bool should_close = false;
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int width = 0;
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int height = 0;
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GLFWkeyfun key_callback = nullptr;
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GLFWmousebuttonfun mouse_button_callback = nullptr;
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GLFWcursorposfun cursor_pos_callback = nullptr;
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GLFWscrollfun scroll_callback = nullptr;
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std::array<unsigned char, 1024> key_state{};
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std::array<unsigned char, 8> mouse_button_state{};
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double cursor_x = 0.0;
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double cursor_y = 0.0;
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};
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namespace {
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constexpr wchar_t kWindowClassName[] = L"OpenCGE_GLFWStub";
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HINSTANCE g_instance = nullptr;
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bool g_initialized = false;
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bool g_resizable = true;
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int map_key(WPARAM vk) {
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if (vk >= 'A' && vk <= 'Z') {
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return GLFW_KEY_A + static_cast<int>(vk - 'A');
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}
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if (vk >= '0' && vk <= '9') {
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return GLFW_KEY_0 + static_cast<int>(vk - '0');
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}
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switch (vk) {
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case VK_ESCAPE:
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return GLFW_KEY_ESCAPE;
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case VK_LEFT:
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return GLFW_KEY_LEFT;
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case VK_RIGHT:
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return GLFW_KEY_RIGHT;
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case VK_UP:
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return GLFW_KEY_UP;
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case VK_DOWN:
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return GLFW_KEY_DOWN;
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case VK_SPACE:
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return GLFW_KEY_SPACE;
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case VK_RETURN:
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return GLFW_KEY_ENTER;
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case VK_TAB:
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return GLFW_KEY_TAB;
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case VK_BACK:
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return GLFW_KEY_BACKSPACE;
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case VK_DELETE:
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return GLFW_KEY_DELETE;
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case VK_LSHIFT:
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return GLFW_KEY_LEFT_SHIFT;
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case VK_RSHIFT:
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return GLFW_KEY_RIGHT_SHIFT;
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case VK_LCONTROL:
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return GLFW_KEY_LEFT_CONTROL;
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case VK_RCONTROL:
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return GLFW_KEY_RIGHT_CONTROL;
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case VK_LMENU:
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return GLFW_KEY_LEFT_ALT;
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case VK_RMENU:
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return GLFW_KEY_RIGHT_ALT;
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default:
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break;
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}
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return GLFW_KEY_UNKNOWN;
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}
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int current_mods() {
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int mods = 0;
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if (GetKeyState(VK_SHIFT) & 0x8000) {
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mods |= GLFW_MOD_SHIFT;
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}
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if (GetKeyState(VK_CONTROL) & 0x8000) {
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mods |= GLFW_MOD_CONTROL;
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}
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if (GetKeyState(VK_MENU) & 0x8000) {
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mods |= GLFW_MOD_ALT;
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}
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if ((GetKeyState(VK_LWIN) & 0x8000) || (GetKeyState(VK_RWIN) & 0x8000)) {
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mods |= GLFW_MOD_SUPER;
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}
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return mods;
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}
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void handle_key(GLFWwindow* window, UINT message, WPARAM wparam, LPARAM lparam) {
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if (window == nullptr || window->key_callback == nullptr) {
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return;
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}
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const int key = map_key(wparam);
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const int scancode = static_cast<int>((lparam >> 16) & 0x1ff);
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const int action = message == WM_KEYDOWN || message == WM_SYSKEYDOWN
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? (((lparam & (1U << 30)) != 0) ? GLFW_REPEAT : GLFW_PRESS)
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: GLFW_RELEASE;
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if (key >= 0 && key < static_cast<int>(window->key_state.size())) {
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window->key_state[key] = action == GLFW_RELEASE ? GLFW_RELEASE : GLFW_PRESS;
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}
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window->key_callback(window, key, scancode, action, current_mods());
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}
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int map_mouse_button(UINT message, WPARAM wparam) {
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switch (message) {
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case WM_LBUTTONDOWN:
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case WM_LBUTTONUP:
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return GLFW_MOUSE_BUTTON_LEFT;
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case WM_RBUTTONDOWN:
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case WM_RBUTTONUP:
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return GLFW_MOUSE_BUTTON_RIGHT;
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case WM_MBUTTONDOWN:
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case WM_MBUTTONUP:
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return GLFW_MOUSE_BUTTON_MIDDLE;
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case WM_XBUTTONDOWN:
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case WM_XBUTTONUP:
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return GET_XBUTTON_WPARAM(wparam) == XBUTTON1 ? GLFW_MOUSE_BUTTON_4
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: GLFW_MOUSE_BUTTON_5;
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default:
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return -1;
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}
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}
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void handle_mouse_button(GLFWwindow* window, UINT message, WPARAM wparam) {
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if (window == nullptr || window->mouse_button_callback == nullptr) {
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return;
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}
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const int button = map_mouse_button(message, wparam);
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if (button < 0) {
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return;
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}
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const bool is_down = message == WM_LBUTTONDOWN || message == WM_RBUTTONDOWN ||
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message == WM_MBUTTONDOWN || message == WM_XBUTTONDOWN;
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window->mouse_button_state[button] = is_down ? GLFW_PRESS : GLFW_RELEASE;
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window->mouse_button_callback(window, button, is_down ? GLFW_PRESS : GLFW_RELEASE,
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current_mods());
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}
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LRESULT CALLBACK window_proc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam) {
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auto* window = reinterpret_cast<GLFWwindow*>(GetWindowLongPtrW(hwnd, GWLP_USERDATA));
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switch (message) {
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case WM_CLOSE:
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if (window != nullptr) {
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window->should_close = true;
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}
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return 0;
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case WM_KEYDOWN:
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case WM_SYSKEYDOWN:
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case WM_KEYUP:
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case WM_SYSKEYUP:
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handle_key(window, message, wparam, lparam);
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return 0;
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case WM_LBUTTONDOWN:
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case WM_LBUTTONUP:
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case WM_RBUTTONDOWN:
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case WM_RBUTTONUP:
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case WM_MBUTTONDOWN:
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case WM_MBUTTONUP:
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case WM_XBUTTONDOWN:
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case WM_XBUTTONUP:
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handle_mouse_button(window, message, wparam);
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return 0;
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case WM_MOUSEMOVE:
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if (window != nullptr) {
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window->cursor_x = static_cast<double>(GET_X_LPARAM(lparam));
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window->cursor_y = static_cast<double>(GET_Y_LPARAM(lparam));
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if (window->cursor_pos_callback != nullptr) {
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window->cursor_pos_callback(window, window->cursor_x, window->cursor_y);
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}
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}
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return 0;
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case WM_MOUSEWHEEL:
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if (window != nullptr && window->scroll_callback != nullptr) {
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const double delta = static_cast<double>(GET_WHEEL_DELTA_WPARAM(wparam)) /
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static_cast<double>(WHEEL_DELTA);
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window->scroll_callback(window, 0.0, delta);
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}
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return 0;
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default:
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break;
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}
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return DefWindowProcW(hwnd, message, wparam, lparam);
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}
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} // namespace
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extern "C" {
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int glfwInit(void) {
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if (g_initialized) {
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return GLFW_TRUE;
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}
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g_instance = GetModuleHandleW(nullptr);
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WNDCLASSEXW wc{};
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wc.cbSize = sizeof(wc);
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wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;
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wc.lpfnWndProc = window_proc;
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wc.hInstance = g_instance;
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wc.hCursor = LoadCursorW(nullptr, MAKEINTRESOURCEW(32512));
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wc.lpszClassName = kWindowClassName;
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if (RegisterClassExW(&wc) == 0) {
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return GLFW_FALSE;
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}
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g_initialized = true;
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return GLFW_TRUE;
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}
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void glfwTerminate(void) {
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g_initialized = false;
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}
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void glfwWindowHint(int hint, int value) {
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if (hint == GLFW_RESIZABLE) {
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g_resizable = value != GLFW_FALSE;
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}
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}
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GLFWwindow* glfwCreateWindow(int width, int height, const char* title, GLFWmonitor*, GLFWwindow*) {
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if (!g_initialized) {
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return nullptr;
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}
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const int wide_length = MultiByteToWideChar(CP_UTF8, 0, title, -1, nullptr, 0);
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std::vector<wchar_t> wide_title(wide_length);
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MultiByteToWideChar(CP_UTF8, 0, title, -1, wide_title.data(), wide_length);
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DWORD style = WS_OVERLAPPEDWINDOW;
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if (!g_resizable) {
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style &= ~(WS_THICKFRAME | WS_MAXIMIZEBOX);
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}
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RECT rect{0, 0, width, height};
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AdjustWindowRectEx(&rect, style, FALSE, 0);
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HWND hwnd = CreateWindowExW(
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0, kWindowClassName, wide_title.data(), style, CW_USEDEFAULT, CW_USEDEFAULT,
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rect.right - rect.left, rect.bottom - rect.top, nullptr, nullptr, g_instance, nullptr);
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if (hwnd == nullptr) {
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return nullptr;
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}
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auto* window = new GLFWwindow();
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window->handle = hwnd;
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window->width = width;
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window->height = height;
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SetWindowLongPtrW(hwnd, GWLP_USERDATA, reinterpret_cast<LONG_PTR>(window));
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ShowWindow(hwnd, SW_SHOW);
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UpdateWindow(hwnd);
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return window;
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}
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void glfwDestroyWindow(GLFWwindow* window) {
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if (window == nullptr) {
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return;
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}
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if (window->handle != nullptr) {
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DestroyWindow(window->handle);
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}
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delete window;
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}
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void glfwSetWindowUserPointer(GLFWwindow* window, void* pointer) {
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if (window != nullptr) {
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window->user_pointer = pointer;
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}
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}
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void* glfwGetWindowUserPointer(GLFWwindow* window) {
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return window != nullptr ? window->user_pointer : nullptr;
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}
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GLFWkeyfun glfwSetKeyCallback(GLFWwindow* window, GLFWkeyfun callback) {
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if (window == nullptr) {
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return nullptr;
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}
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GLFWkeyfun previous = window->key_callback;
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window->key_callback = callback;
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return previous;
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}
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GLFWmousebuttonfun glfwSetMouseButtonCallback(GLFWwindow* window, GLFWmousebuttonfun callback) {
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if (window == nullptr) {
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return nullptr;
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}
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GLFWmousebuttonfun previous = window->mouse_button_callback;
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window->mouse_button_callback = callback;
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return previous;
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}
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GLFWcursorposfun glfwSetCursorPosCallback(GLFWwindow* window, GLFWcursorposfun callback) {
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if (window == nullptr) {
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return nullptr;
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}
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GLFWcursorposfun previous = window->cursor_pos_callback;
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window->cursor_pos_callback = callback;
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return previous;
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}
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GLFWscrollfun glfwSetScrollCallback(GLFWwindow* window, GLFWscrollfun callback) {
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if (window == nullptr) {
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return nullptr;
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}
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GLFWscrollfun previous = window->scroll_callback;
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window->scroll_callback = callback;
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return previous;
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}
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void glfwPollEvents(void) {
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MSG msg{};
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while (PeekMessageW(&msg, nullptr, 0, 0, PM_REMOVE)) {
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TranslateMessage(&msg);
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DispatchMessageW(&msg);
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}
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}
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int glfwWindowShouldClose(GLFWwindow* window) {
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return window != nullptr && window->should_close ? GLFW_TRUE : GLFW_FALSE;
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}
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int glfwGetKey(GLFWwindow* window, int key) {
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if (window == nullptr || key < 0 || key >= static_cast<int>(window->key_state.size())) {
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return GLFW_RELEASE;
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}
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return window->key_state[key] != 0 ? GLFW_PRESS : GLFW_RELEASE;
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}
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int glfwGetMouseButton(GLFWwindow* window, int button) {
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if (window == nullptr || button < 0 ||
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button >= static_cast<int>(window->mouse_button_state.size())) {
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return GLFW_RELEASE;
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}
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return window->mouse_button_state[button] != 0 ? GLFW_PRESS : GLFW_RELEASE;
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}
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void glfwGetCursorPos(GLFWwindow* window, double* xpos, double* ypos) {
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if (xpos != nullptr) {
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*xpos = window != nullptr ? window->cursor_x : 0.0;
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}
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if (ypos != nullptr) {
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*ypos = window != nullptr ? window->cursor_y : 0.0;
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}
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}
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void glfwGetFramebufferSize(GLFWwindow* window, int* width, int* height) {
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if (window == nullptr || window->handle == nullptr) {
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return;
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}
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RECT client{};
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GetClientRect(window->handle, &client);
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if (width != nullptr) {
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*width = client.right - client.left;
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}
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if (height != nullptr) {
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*height = client.bottom - client.top;
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}
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}
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const char** glfwGetRequiredInstanceExtensions(uint32_t* count) {
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static const char* extensions[] = {
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VK_KHR_SURFACE_EXTENSION_NAME,
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VK_KHR_WIN32_SURFACE_EXTENSION_NAME,
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};
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if (count != nullptr) {
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*count = static_cast<uint32_t>(sizeof(extensions) / sizeof(extensions[0]));
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}
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return extensions;
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}
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VkResult glfwCreateWindowSurface(VkInstance instance, GLFWwindow* window,
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const VkAllocationCallbacks* allocator,
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VkSurfaceKHR* surface) {
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if (instance == VK_NULL_HANDLE || window == nullptr || surface == nullptr) {
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return VK_ERROR_INITIALIZATION_FAILED;
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}
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auto create_surface = reinterpret_cast<PFN_vkCreateWin32SurfaceKHR>(
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vkGetInstanceProcAddr(instance, "vkCreateWin32SurfaceKHR"));
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if (create_surface == nullptr) {
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return VK_ERROR_EXTENSION_NOT_PRESENT;
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}
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VkWin32SurfaceCreateInfoKHR info{};
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info.sType = VK_STRUCTURE_TYPE_WIN32_SURFACE_CREATE_INFO_KHR;
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info.hinstance = g_instance;
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info.hwnd = window->handle;
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return create_surface(instance, &info, allocator, surface);
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}
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} // extern "C"
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