1 /* xscreensaver, Copyright (c) 2006-2009 Jamie Zawinski <jwz@jwz.org>
3 * Permission to use, copy, modify, distribute, and sell this software and its
4 * documentation for any purpose is hereby granted without fee, provided that
5 * the above copyright notice appear in all copies and that both that
6 * copyright notice and this permission notice appear in supporting
7 * documentation. No representations are made about the suitability of this
8 * software for any purpose. It is provided "as is" without express or
12 /* This is a subclass of Apple's ScreenSaverView that knows how to run
13 xscreensaver programs without X11 via the dark magic of the "jwxyz"
14 library. In xscreensaver terminology, this is the replacement for
15 the "screenhack.c" module.
18 #import "XScreenSaverGLView.h"
19 #import "XScreenSaverConfigSheet.h"
20 #import "screenhackI.h"
21 #import "xlockmoreI.h"
23 #import <OpenGL/OpenGL.h>
25 /* used by the OpenGL screen savers
27 extern GLXContext *init_GL (ModeInfo *);
28 extern void glXSwapBuffers (Display *, Window);
29 extern void glXMakeCurrent (Display *, Window, GLXContext);
30 extern void clear_gl_error (void);
31 extern void check_gl_error (const char *type);
34 @implementation XScreenSaverGLView
39 /* #### Do we have to destroy ogl_ctx? */
47 [super stopAnimation];
49 // Without this, the GL frame stays on screen when switching tabs
50 // in System Preferences.
52 [NSOpenGLContext clearCurrentContext];
56 // #### maybe this could/should just be on 'lockFocus' instead?
57 - (void) prepareContext
60 [ogl_ctx makeCurrentContext];
61 // check_gl_error ("makeCurrentContext");
67 - (void) resizeContext
70 [ogl_ctx setView:self];
74 - (void)drawRect:(NSRect)rect
77 [super drawRect:rect];
81 - (NSOpenGLContext *) oglContext
87 - (void) setOglContext: (NSOpenGLContext *) ctx
96 /* Utility functions...
100 /* Called by OpenGL savers using the XLockmore API.
103 init_GL (ModeInfo *mi)
105 Window win = mi->window;
106 XScreenSaverGLView *view = (XScreenSaverGLView *) jwxyz_window_view (win);
107 NSOpenGLContext *ctx = [view oglContext];
111 NSOpenGLPixelFormatAttribute attrs[] = {
112 NSOpenGLPFADoubleBuffer,
113 NSOpenGLPFAColorSize, 24,
114 NSOpenGLPFAAlphaSize, 8,
115 NSOpenGLPFADepthSize, 16,
117 NSOpenGLPixelFormat *pixfmt = [[NSOpenGLPixelFormat alloc]
118 initWithAttributes:attrs];
120 ctx = [[NSOpenGLContext alloc]
121 initWithFormat:pixfmt
125 // Sync refreshes to the vertical blanking interval
127 [ctx setValues:&r forParameter:NSOpenGLCPSwapInterval];
129 [ctx makeCurrentContext];
130 check_gl_error ("makeCurrentContext");
132 [view setOglContext:ctx];
134 // Clear frame buffer ASAP, else there are bits left over from other apps.
135 glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
137 // glXSwapBuffers (mi->dpy, mi->window);
140 // Enable multi-threading, if possible. This runs most OpenGL commands
141 // and GPU management on a second CPU.
143 # ifndef kCGLCEMPEngine
144 # define kCGLCEMPEngine 313 // Added in MacOS 10.4.8 + XCode 2.4.
146 CGLContextObj cctx = CGLGetCurrentContext();
147 CGLError err = CGLEnable (cctx, kCGLCEMPEngine);
148 if (err != kCGLNoError) {
149 NSLog (@"enabling multi-threaded OpenGL failed: %d", err);
154 // Caller expects a pointer to an opaque struct... which it dereferences.
155 // Don't ask me, it's historical...
156 static int blort = -1;
157 return (void *) &blort;
161 /* Copy the back buffer to the front buffer.
164 glXSwapBuffers (Display *dpy, Window window)
166 XScreenSaverGLView *view = (XScreenSaverGLView *) jwxyz_window_view (window);
167 NSOpenGLContext *ctx = [view oglContext];
168 if (ctx) [ctx flushBuffer]; // despite name, this actually swaps
171 /* Does nothing - prepareContext already did the work.
174 glXMakeCurrent (Display *dpy, Window window, GLXContext context)
179 /* clear away any lingering error codes */
181 clear_gl_error (void)
183 while (glGetError() != GL_NO_ERROR)
188 /* report a GL error. */
190 check_gl_error (const char *type)
195 switch ((i = glGetError())) {
196 case GL_NO_ERROR: return;
197 case GL_INVALID_ENUM: e = "invalid enum"; break;
198 case GL_INVALID_VALUE: e = "invalid value"; break;
199 case GL_INVALID_OPERATION: e = "invalid operation"; break;
200 case GL_STACK_OVERFLOW: e = "stack overflow"; break;
201 case GL_STACK_UNDERFLOW: e = "stack underflow"; break;
202 case GL_OUT_OF_MEMORY: e = "out of memory"; break;
203 #ifdef GL_TABLE_TOO_LARGE_EXT
204 case GL_TABLE_TOO_LARGE_EXT: e = "table too large"; break;
206 #ifdef GL_TEXTURE_TOO_LARGE_EXT
207 case GL_TEXTURE_TOO_LARGE_EXT: e = "texture too large"; break;
210 e = buf; sprintf (buf, "unknown GL error %d", (int) i); break;
212 NSLog (@"%s GL error: %s", type, e);