From http://www.jwz.org/xscreensaver/xscreensaver-5.35.tar.gz

[xscreensaver] / jwxyz / jwxyz-cocoa.h

diff --git a/jwxyz/jwxyz-cocoa.h b/jwxyz/jwxyz-cocoa.h
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+/* xscreensaver, Copyright (c) 1991-2015 Jamie Zawinski <jwz@jwz.org>
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation.  No representations are made about the suitability of this
+ * software for any purpose.  It is provided "as is" without express or 
+ * implied warranty.
+ */
+
+#ifndef __JWXYZ_COCOA_H__
+#define __JWXYZ_COCOA_H__
+
+#import "XScreenSaverView.h"
+
+#ifdef USE_IPHONE
+# import <UIKit/UIKit.h>
+# define NSView           UIView
+# define NSOpenGLContext  EAGLContext
+#endif
+
+#ifdef JWXYZ_QUARTZ
+
+struct jwxyz_Drawable {
+  enum { WINDOW, PIXMAP } type;
+  CGContextRef cgc;
+  CGImageRef cgi;
+  XRectangle frame;
+  union {
+    struct {
+      XScreenSaverView *view;
+      int last_mouse_x, last_mouse_y;
+    } window;
+    struct {
+      int depth;
+      void *cgc_buffer;                // the bits to which CGContextRef renders
+    } pixmap;
+  };
+};
+
+#elif defined JWXYZ_GL
+
+struct jwxyz_Drawable {
+  enum { WINDOW, PIXMAP } type;
+  /* OS X: Contexts are unique for each pixmap, 'cause life is hectic. (OS X
+           appears to dislike it when you attach different pbuffers to the
+           same context one after the other, apparently.) The Window has this
+           CFRetained because of garbage collection. For both Pixmaps and
+           Windows, CFRelease this when done.
+     iOS:  ogl_ctx here is set to either XScreenSaverView.ogl_ctx or
+           XRootWindow()->window.ogl_ctx_pixmap. No garbage collection antics
+           here, so no need to CFRetain anything. Plus, if a screenhack leaks
+           a Pixmap (and they do that all the time), ogl_ctx_pixmap will also
+           get leaked if a Pixmap CFRetains this.
+   */
+  NSOpenGLContext *ogl_ctx;      // OpenGL rendering context (OS X)
+# ifdef USE_IPHONE
+  // TODO: Also on OS X as extensions.
+  GLuint gl_framebuffer, gl_renderbuffer;
+# endif // USE_IPHONE
+  CGImageRef cgi;
+  XRectangle frame;
+  union {
+    struct {
+      XScreenSaverView *view;
+      int last_mouse_x, last_mouse_y;
+      struct jwxyz_Drawable *current_drawable;
+# ifndef USE_IPHONE
+      NSOpenGLPixelFormat *pixfmt;
+      GLint virtual_screen;
+# else // USE_IPHONE
+      NSOpenGLContext *ogl_ctx_pixmap;
+# endif
+    } window;
+    struct {
+      int depth;
+# ifndef USE_IPHONE
+      NSOpenGLPixelBuffer *gl_pbuffer;
+      // GLuint blit_texture; // TODO: For blitting from Pbuffers
+# endif
+    } pixmap;
+  };
+};
+
+#endif // JWXYZ_GL
+
+#ifdef USE_IPHONE
+extern void create_framebuffer (GLuint *gl_framebuffer,
+                                GLuint *gl_renderbuffer);
+extern void check_framebuffer_status (void);
+#endif // USE_IPHONE
+
+#define jwxyz_window_view(w) ((w)->window.view)
+
+#endif