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internal bool
create_service_window()
{
WNDCLASSEX service_window_class = {};
service_window_class.style = CS_OWNDC;
service_window_class.cbSize = sizeof(service_window_class);
service_window_class.lpfnWndProc = &win32_service_window_proc;
service_window_class.hInstance = GetModuleHandle(NULL);
service_window_class.hIcon = LoadIcon(NULL, IDI_APPLICATION);
service_window_class.hCursor = LoadCursor(NULL, IDC_ARROW);
service_window_class.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
service_window_class.lpszClassName = "win32_service_window_class";
if (RegisterClassEx(&service_window_class) == 0)
{
printf("RegisterClassEx() failed\n");
return 0;
}
const char *service_window_name = "win32_service_window";
HWND service_window = CreateWindowEx(0,
service_window_class.lpszClassName,
service_window_name,
0,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
0,
0,
service_window_class.hInstance,
0);
if (!service_window)
{
printf("CreateWindowEx() failed\n");
return 0;
}
/*
* Create fake gl context, so I can create window with modern opengl context.
* Doing this with the service window prevents creating another 'fake' window.
*/
HDC dc = GetDC(service_window);
if (!dc)
{
printf("GetDC() failed\n");
return false;
}
PIXELFORMATDESCRIPTOR pfd;
init_pfd(&pfd);
int pixel_format = ChoosePixelFormat(dc, &pfd);
if (pixel_format == 0)
{
printf("ChoosePixelFormat failed\n");
return false;
}
BOOL pixel_format_set = SetPixelFormat(dc, pixel_format, &pfd);
if (pixel_format_set == FALSE)
{
printf("SetPixelFormat() failed\n");
return false;
}
HGLRC glrc = wglCreateContext(dc);
if (!glrc)
{
printf("wglCreateContext() failed\n");
return false;
}
BOOL made_current = wglMakeCurrent(dc, glrc);
if (made_current == FALSE)
{
printf("wglMakeCurrent() failed\n");
return false;
}
// TODO: check if extensions are actually supported
// "WGL_ARB_pixel_format"
// "WGL_ARB_create_context"
// TODO: check all return values indicating invalid function from wglGetProcAddress
// msdn: 0 https://docs.microsoft.com/en-us/windows/win32/api/wingdi/nf-wingdi-wglgetprocaddress
// khronos: (void*){0,1,2,3,-1} https://www.khronos.org/opengl/wiki/Load_OpenGL_Functions#Windows_2
wglChoosePixelFormatARB = (PFNWGLCHOOSEPIXELFORMATARBPROC)wglGetProcAddress("wglChoosePixelFormatARB");
wglCreateContextAttribsARB = (PFNWGLCREATECONTEXTATTRIBSARBPROC)wglGetProcAddress("wglCreateContextAttribsARB");
if (!wglChoosePixelFormatARB || !wglCreateContextAttribsARB)
{
printf("wgl functions to create context not received\n");
return false;
}
g_service_window = service_window;
return true;
}
Win32_Window* platform_create_window(const char *name, int width, int height)
{
Win32_Window *window = (Win32_Window*)malloc(sizeof(Platform_Window));
if (!window)
{
printf("out of memory to create window\n");
return 0;
}
// Note: SendMessage returns when execution is finished, so settings can be on stack
Win32_Window_Settings settings = {name, width, height};
HWND handle = (HWND)SendMessage(g_service_window, WIN32_CREATE_WINDOW, (WPARAM)&settings, 0);
if (!handle)
return 0;
HDC dc = GetDC(handle);
if (!dc)
{
printf("GetDC failed\n");
return 0;
}
const int pixel_format_attribs[] =
{
WGL_DRAW_TO_WINDOW_ARB, GL_TRUE,
WGL_SUPPORT_OPENGL_ARB, GL_TRUE,
WGL_DOUBLE_BUFFER_ARB, GL_TRUE,
WGL_PIXEL_TYPE_ARB, WGL_TYPE_RGBA_ARB,
WGL_COLOR_BITS_ARB, 32,
WGL_DEPTH_BITS_ARB, 24,
WGL_STENCIL_BITS_ARB, 8,
0, // End
};
int pixel_format;
UINT cnt_pixel_formats;
if (wglChoosePixelFormatARB(dc, pixel_format_attribs, NULL, 1, &pixel_format, &cnt_pixel_formats) == FALSE)
{
printf("wglChoosePixelFormat return false\n");
return 0;
}
PIXELFORMATDESCRIPTOR pfd;
init_pfd(&pfd);
if (SetPixelFormat(dc, pixel_format, &pfd) == FALSE)
{
printf("SetPixelFormat return false\n");
return 0;
}
int context_attribs[] =
{
WGL_CONTEXT_MAJOR_VERSION_ARB, 4,
WGL_CONTEXT_MINOR_VERSION_ARB, 3,
WGL_CONTEXT_PROFILE_MASK_ARB, WGL_CONTEXT_CORE_PROFILE_BIT_ARB,
0
};
HGLRC glrc = wglCreateContextAttribsARB(dc, 0, context_attribs);
if (!glrc)
{
printf("wglCreateContextAttribsARB failed\n");
return 0;
}
if (wglMakeCurrent(dc, glrc) == FALSE)
{
printf("wglMakeCurrent failed\n");
return 0;
}
window->window = handle;
window->dc = dc;
window->glrc = glrc;
return window;
}
bool platform_init_windowing()
{
g_main_thread_id = GetCurrentThreadId();
g_opengl_module = LoadLibraryA("opengl32.dll");
if (!g_opengl_module)
{
printf("can't open opengl32.dll\n");
return false;
}
DWORD tid;
HANDLE thread = CreateThread(0, 0, win32_service_window_thread, 0, 0, &tid);
if (!thread)
{
printf("error: CreateThread(...) failed\n");
return false;
}
// wait until service window is ready
for (;;)
{
MSG message;
GetMessageA(&message, 0, 0, 0);
if (message.message == WIN32_SERVICE_WINDOW_CREATED)
return true;
else
return false;
}
}
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