Expose functional stub backend

4 files changed, 79 insertions, 1 deletions

diff --git a/pugl/detail/mac.m b/pugl/detail/mac.m
index c9847eb..e8a5d57 100644
--- a/pugl/detail/mac.m
+++ b/pugl/detail/mac.m
@@ -24,6 +24,7 @@
 #include "pugl/detail/implementation.h"
 #include "pugl/detail/mac.h"
 #include "pugl/pugl.h"
+#include "pugl/pugl_stub_backend.h"
 
 #import <Cocoa/Cocoa.h>
 
@@ -1071,3 +1072,17 @@ puglSetClipboard(PuglView* const   view,
 
 	return PUGL_SUCCESS;
 }
+
+const PuglBackend*
+puglStubBackend(void)
+{
+	static const PuglBackend backend = {puglStubConfigure,
+	                                    puglStubCreate,
+	                                    puglStubDestroy,
+	                                    puglStubEnter,
+	                                    puglStubLeave,
+	                                    puglStubResize,
+	                                    puglStubGetContext};
+
+	return &backend;
+}
diff --git a/pugl/detail/win.c b/pugl/detail/win.c
index 408e7ba..b9004b2 100644
--- a/pugl/detail/win.c
+++ b/pugl/detail/win.c
@@ -21,6 +21,7 @@
 #include "pugl/detail/implementation.h"
 #include "pugl/detail/win.h"
 #include "pugl/pugl.h"
+#include "pugl/pugl_stub_backend.h"
 
 #include <windows.h>
 #include <windowsx.h>
@@ -927,3 +928,40 @@ puglSetClipboard(PuglView* const   view,
 	CloseClipboard();
 	return PUGL_SUCCESS;
 }
+
+static PuglStatus
+puglWinStubEnter(PuglView* view, bool drawing)
+{
+	if (drawing) {
+		PAINTSTRUCT ps;
+		BeginPaint(view->impl->hwnd, &ps);
+	}
+
+	return PUGL_SUCCESS;
+}
+
+static PuglStatus
+puglWinStubLeave(PuglView* view, bool drawing)
+{
+	if (drawing) {
+		PAINTSTRUCT ps;
+		EndPaint(view->impl->hwnd, &ps);
+		SwapBuffers(view->impl->hdc);
+	}
+
+	return PUGL_SUCCESS;
+}
+
+const PuglBackend*
+puglStubBackend(void)
+{
+	static const PuglBackend backend = {puglWinStubConfigure,
+	                                    puglStubCreate,
+	                                    puglStubDestroy,
+	                                    puglWinStubEnter,
+	                                    puglWinStubLeave,
+	                                    puglStubResize,
+	                                    puglStubGetContext};
+
+	return &backend;
+}
diff --git a/pugl/detail/x11.c b/pugl/detail/x11.c
index 7bf5223..fd47db3 100644
--- a/pugl/detail/x11.c
+++ b/pugl/detail/x11.c
@@ -26,6 +26,7 @@
 #include "pugl/detail/types.h"
 #include "pugl/detail/x11.h"
 #include "pugl/pugl.h"
+#include "pugl/pugl_stub_backend.h"
 
 #include <X11/X.h>
 #include <X11/Xatom.h>
@@ -908,3 +909,17 @@ puglSetClipboard(PuglView* const   view,
 	XSetSelectionOwner(impl->display, atoms->CLIPBOARD, impl->win, CurrentTime);
 	return PUGL_SUCCESS;
 }
+
+const PuglBackend*
+puglStubBackend(void)
+{
+	static const PuglBackend backend = {puglX11StubConfigure,
+	                                    puglStubCreate,
+	                                    puglStubDestroy,
+	                                    puglStubEnter,
+	                                    puglStubLeave,
+	                                    puglStubResize,
+	                                    puglStubGetContext};
+
+	return &backend;
+}
diff --git a/pugl/pugl_stub_backend.h b/pugl/pugl_stub_backend.h
index 27a961b..7de6e14 100644
--- a/pugl/pugl_stub_backend.h
+++ b/pugl/pugl_stub_backend.h
@@ -15,7 +15,7 @@
 */
 
 /**
-   @file pugl_stub_backend.h Stub backend functions.
+   @file pugl_stub_backend.h Stub backend functions and accessor declaration.
 */
 
 #ifndef PUGL_STUB_BACKEND_H
@@ -28,6 +28,16 @@ extern "C" {
 #endif
 
 /**
+   Stub graphics backend.
+
+   This backend just creates a simple native window without setting up any
+   portable graphics API.
+*/
+PUGL_API
+const PuglBackend*
+puglStubBackend(void);
+
+/**
    @name Stub backend functions
 
    Implementations of stub backend functions which do nothing and always return