Rename "backend" headers

Working on Vulkan clarified what has always been slightly smelly about the
design and organization here: not everything that is API specific is really in
a "backend" (a PuglBackend).  The concrete example is puglGetProcAddress(),
which only makes sense for GL and is actually implemented in the "backend"
files.  Arguably puglGetContext() is also such a thing.

So, rename the headers so they can be the place where API-specific things go in
general, which happens to include a backend most of the time.  The stub is a
bit of an exception to this, but whatever.  The includes look tidier this way.

In place of the old headers are compatibility stubs that just emit a warning
and include the new version, which will be maintained for a while.

1 files changed, 2 insertions, 21 deletions

diff --git a/pugl/pugl_cairo_backend.h b/pugl/pugl_cairo_backend.h
index 9e1a046..3f8cec3 100644
--- a/pugl/pugl_cairo_backend.h
+++ b/pugl/pugl_cairo_backend.h
@@ -14,29 +14,10 @@
   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 
-/**
-   @file pugl_cairo_backend.h Declaration of Cairo backend accessor.
-*/
-
 #ifndef PUGL_PUGL_CAIRO_BACKEND_H
 #define PUGL_PUGL_CAIRO_BACKEND_H
 
-#include "pugl/pugl.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/**
-   Cairo graphics backend accessor.
-
-   Pass the return value to puglInitBackend() to draw to a view with Cairo.
-*/
-PUGL_API const PuglBackend*
-puglCairoBackend(void);
-
-#ifdef __cplusplus
-}  /* extern "C" */
-#endif
+#warning "This header is deprecated, use pugl/pugl_cairo.h instead."
+#include "pugl/pugl_cairo.h"
 
 #endif // PUGL_PUGL_CAIRO_BACKEND_H