1 /* cairo - a vector graphics library with display and print output
3 * Copyright © 2009 Eric Anholt
4 * Copyright © 2009 Chris Wilson
5 * Copyright © 2005 Red Hat, Inc
7 * This library is free software; you can redistribute it and/or
8 * modify it either under the terms of the GNU Lesser General Public
9 * License version 2.1 as published by the Free Software Foundation
10 * (the "LGPL") or, at your option, under the terms of the Mozilla
11 * Public License Version 1.1 (the "MPL"). If you do not alter this
12 * notice, a recipient may use your version of this file under either
13 * the MPL or the LGPL.
15 * You should have received a copy of the LGPL along with this library
16 * in the file COPYING-LGPL-2.1; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
18 * You should have received a copy of the MPL along with this library
19 * in the file COPYING-MPL-1.1
21 * The contents of this file are subject to the Mozilla Public License
22 * Version 1.1 (the "License"); you may not use this file except in
23 * compliance with the License. You may obtain a copy of the License at
24 * http://www.mozilla.org/MPL/
26 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
27 * OF ANY KIND, either express or implied. See the LGPL or the MPL for
28 * the specific language governing rights and limitations.
30 * The Original Code is the cairo graphics library.
32 * The Initial Developer of the Original Code is Red Hat, Inc.
35 * Carl Worth <cworth@cworth.org>
36 * Chris Wilson <chris@chris-wilson.co.uk>
41 #include "cairo-gl-private.h"
43 #include "cairo-error-private.h"
45 #include <X11/Xutil.h>
47 /* XXX needs hooking into XCloseDisplay() */
49 typedef struct _cairo_glx_context {
50 cairo_gl_context_t base;
56 Display *previous_display;
57 GLXDrawable previous_drawable;
58 GLXContext previous_context;
60 cairo_bool_t has_multithread_makecurrent;
61 } cairo_glx_context_t;
63 typedef struct _cairo_glx_surface {
64 cairo_gl_surface_t base;
67 } cairo_glx_surface_t;
70 _context_acquisition_changed_glx_state (cairo_glx_context_t *ctx,
71 GLXDrawable current_drawable)
73 return !(ctx->previous_display == ctx->display &&
74 ctx->previous_drawable == current_drawable &&
75 ctx->previous_context == ctx->context);
79 _glx_get_current_drawable (cairo_glx_context_t *ctx)
81 if (ctx->base.current_target == NULL ||
82 _cairo_gl_surface_is_texture (ctx->base.current_target)) {
83 return ctx->dummy_window;
86 return ((cairo_glx_surface_t *) ctx->base.current_target)->win;
90 _glx_query_current_state (cairo_glx_context_t * ctx)
92 ctx->previous_drawable = glXGetCurrentDrawable ();
93 ctx->previous_display = glXGetCurrentDisplay ();
94 ctx->previous_context = glXGetCurrentContext ();
98 _glx_acquire (void *abstract_ctx)
100 cairo_glx_context_t *ctx = abstract_ctx;
101 GLXDrawable current_drawable = _glx_get_current_drawable (ctx);
103 _glx_query_current_state (ctx);
104 if (!_context_acquisition_changed_glx_state (ctx, current_drawable))
107 glXMakeCurrent (ctx->display, current_drawable, ctx->context);
111 _glx_make_current (void *abstract_ctx, cairo_gl_surface_t *abstract_surface)
113 cairo_glx_context_t *ctx = abstract_ctx;
114 cairo_glx_surface_t *surface = (cairo_glx_surface_t *) abstract_surface;
116 /* Set the window as the target of our context. */
117 glXMakeCurrent (ctx->display, surface->win, ctx->context);
121 _glx_release (void *abstract_ctx)
123 cairo_glx_context_t *ctx = abstract_ctx;
125 if (ctx->has_multithread_makecurrent || !ctx->base.thread_aware)
128 glXMakeCurrent (ctx->display, None, None);
132 _glx_swap_buffers (void *abstract_ctx,
133 cairo_gl_surface_t *abstract_surface)
135 cairo_glx_context_t *ctx = abstract_ctx;
136 cairo_glx_surface_t *surface = (cairo_glx_surface_t *) abstract_surface;
138 glXSwapBuffers (ctx->display, surface->win);
142 _glx_destroy (void *abstract_ctx)
144 cairo_glx_context_t *ctx = abstract_ctx;
146 if (ctx->dummy_window != None)
147 XDestroyWindow (ctx->display, ctx->dummy_window);
149 glXMakeCurrent (ctx->display, None, None);
152 static cairo_status_t
153 _glx_dummy_ctx (Display *dpy, GLXContext gl_ctx, Window *dummy)
155 int attr[3] = { GLX_FBCONFIG_ID, 0, None };
159 XSetWindowAttributes swa;
163 /* Create a dummy window created for the target GLX context that we can
164 * use to query the available GL/GLX extensions.
166 glXQueryContext (dpy, gl_ctx, GLX_FBCONFIG_ID, &attr[1]);
169 config = glXChooseFBConfig (dpy, DefaultScreen (dpy), attr, &cnt);
170 if (unlikely (cnt == 0))
171 return _cairo_error (CAIRO_STATUS_INVALID_FORMAT);
173 vi = glXGetVisualFromFBConfig (dpy, config[0]);
176 if (unlikely (vi == NULL))
177 return _cairo_error (CAIRO_STATUS_INVALID_FORMAT);
179 cmap = XCreateColormap (dpy,
180 RootWindow (dpy, vi->screen),
184 swa.border_pixel = 0;
185 win = XCreateWindow (dpy, RootWindow (dpy, vi->screen),
190 CWBorderPixel | CWColormap, &swa);
191 XFreeColormap (dpy, cmap);
195 if (unlikely (! glXMakeCurrent (dpy, win, gl_ctx))) {
196 XDestroyWindow (dpy, win);
197 return _cairo_error (CAIRO_STATUS_NO_MEMORY);
201 return CAIRO_STATUS_SUCCESS;
205 cairo_glx_device_create (Display *dpy, GLXContext gl_ctx)
207 cairo_glx_context_t *ctx;
208 cairo_status_t status;
210 const char *glx_extensions;
212 ctx = calloc (1, sizeof (cairo_glx_context_t));
213 if (unlikely (ctx == NULL))
214 return _cairo_gl_context_create_in_error (CAIRO_STATUS_NO_MEMORY);
216 status = _glx_dummy_ctx (dpy, gl_ctx, &dummy);
217 if (unlikely (status)) {
219 return _cairo_gl_context_create_in_error (status);
223 ctx->dummy_window = dummy;
224 ctx->context = gl_ctx;
226 ctx->base.acquire = _glx_acquire;
227 ctx->base.release = _glx_release;
228 ctx->base.make_current = _glx_make_current;
229 ctx->base.swap_buffers = _glx_swap_buffers;
230 ctx->base.destroy = _glx_destroy;
232 status = _cairo_gl_dispatch_init (&ctx->base.dispatch,
233 (cairo_gl_get_proc_addr_func_t) glXGetProcAddress);
234 if (unlikely (status)) {
236 return _cairo_gl_context_create_in_error (status);
239 status = _cairo_gl_context_init (&ctx->base);
240 if (unlikely (status)) {
242 return _cairo_gl_context_create_in_error (status);
245 glx_extensions = glXQueryExtensionsString (dpy, DefaultScreen (dpy));
246 if (strstr(glx_extensions, "GLX_MESA_multithread_makecurrent")) {
247 ctx->has_multithread_makecurrent = TRUE;
250 ctx->base.release (ctx);
252 return &ctx->base.base;
256 cairo_glx_device_get_display (cairo_device_t *device)
258 cairo_glx_context_t *ctx;
260 if (device->backend->type != CAIRO_DEVICE_TYPE_GL) {
261 _cairo_error_throw (CAIRO_STATUS_DEVICE_TYPE_MISMATCH);
265 ctx = (cairo_glx_context_t *) device;
271 cairo_glx_device_get_context (cairo_device_t *device)
273 cairo_glx_context_t *ctx;
275 if (device->backend->type != CAIRO_DEVICE_TYPE_GL) {
276 _cairo_error_throw (CAIRO_STATUS_DEVICE_TYPE_MISMATCH);
280 ctx = (cairo_glx_context_t *) device;
286 cairo_gl_surface_create_for_window (cairo_device_t *device,
291 cairo_glx_surface_t *surface;
293 if (unlikely (device->status))
294 return _cairo_surface_create_in_error (device->status);
296 if (device->backend->type != CAIRO_DEVICE_TYPE_GL)
297 return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH));
299 if (width <= 0 || height <= 0)
300 return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_SIZE));
302 surface = calloc (1, sizeof (cairo_glx_surface_t));
303 if (unlikely (surface == NULL))
304 return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
306 _cairo_gl_surface_init (device, &surface->base,
307 CAIRO_CONTENT_COLOR_ALPHA, width, height);
310 return &surface->base.base;