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+/* cairo - a vector graphics library with display and print output
+ *
+ * Copyright © 2009 Eric Anholt
+ * Copyright © 2009 Chris Wilson
+ * Copyright © 2005 Red Hat, Inc
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it either under the terms of the GNU Lesser General Public
+ * License version 2.1 as published by the Free Software Foundation
+ * (the "LGPL") or, at your option, under the terms of the Mozilla
+ * Public License Version 1.1 (the "MPL"). If you do not alter this
+ * notice, a recipient may use your version of this file under either
+ * the MPL or the LGPL.
+ *
+ * You should have received a copy of the LGPL along with this library
+ * in the file COPYING-LGPL-2.1; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
+ * You should have received a copy of the MPL along with this library
+ * in the file COPYING-MPL-1.1
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
+ * OF ANY KIND, either express or implied. See the LGPL or the MPL for
+ * the specific language governing rights and limitations.
+ *
+ * The Original Code is the cairo graphics library.
+ *
+ * The Initial Developer of the Original Code is Red Hat, Inc.
+ *
+ * Contributor(s):
+ * Carl Worth <cworth@cworth.org>
+ * Chris Wilson <chris@chris-wilson.co.uk>
+ */
+
+#include "cairoint.h"
+
+#include "cairo-gl-private.h"
+
+#include "cairo-error-private.h"
+
+#include <X11/Xutil.h>
+
+/* XXX needs hooking into XCloseDisplay() */
+
+typedef struct _cairo_glx_context {
+ cairo_gl_context_t base;
+
+ Display *display;
+ Window dummy_window;
+ GLXContext context;
+
+ GLXDrawable previous_drawable;
+ GLXContext previous_context;
+
+ cairo_bool_t has_multithread_makecurrent;
+} cairo_glx_context_t;
+
+typedef struct _cairo_glx_surface {
+ cairo_gl_surface_t base;
+
+ Window win;
+} cairo_glx_surface_t;
+
+static cairo_bool_t
+_context_acquisition_changed_glx_state (cairo_glx_context_t *ctx,
+ GLXDrawable current_drawable)
+{
+ return ctx->previous_drawable != current_drawable ||
+ ctx->previous_context != ctx->context;
+}
+
+static GLXDrawable
+_glx_get_current_drawable (cairo_glx_context_t *ctx)
+{
+ if (ctx->base.current_target == NULL ||
+ _cairo_gl_surface_is_texture (ctx->base.current_target)) {
+ return ctx->dummy_window;
+ }
+
+ return ((cairo_glx_surface_t *) ctx->base.current_target)->win;
+}
+
+static void
+_glx_query_current_state (cairo_glx_context_t * ctx)
+{
+ ctx->previous_drawable = glXGetCurrentDrawable ();
+ ctx->previous_context = glXGetCurrentContext ();
+
+ /* If any of the values were none, assume they are all none. Not all
+ drivers seem well behaved when it comes to using these values across
+ multiple threads. */
+ if (ctx->previous_drawable == None ||
+ ctx->previous_context == None) {
+ ctx->previous_drawable = None;
+ ctx->previous_context = None;
+ }
+}
+
+static void
+_glx_acquire (void *abstract_ctx)
+{
+ cairo_glx_context_t *ctx = abstract_ctx;
+ GLXDrawable current_drawable = _glx_get_current_drawable (ctx);
+
+ _glx_query_current_state (ctx);
+ if (!_context_acquisition_changed_glx_state (ctx, current_drawable))
+ return;
+
+ glXMakeCurrent (ctx->display, current_drawable, ctx->context);
+}
+
+static void
+_glx_make_current (void *abstract_ctx, cairo_gl_surface_t *abstract_surface)
+{
+ cairo_glx_context_t *ctx = abstract_ctx;
+ cairo_glx_surface_t *surface = (cairo_glx_surface_t *) abstract_surface;
+
+ /* Set the window as the target of our context. */
+ glXMakeCurrent (ctx->display, surface->win, ctx->context);
+}
+
+static void
+_glx_release (void *abstract_ctx)
+{
+ cairo_glx_context_t *ctx = abstract_ctx;
+
+ if (ctx->has_multithread_makecurrent || !ctx->base.thread_aware ||
+ !_context_acquisition_changed_glx_state (ctx,
+ _glx_get_current_drawable (ctx))) {
+ return;
+ }
+
+ glXMakeCurrent (ctx->display, None, None);
+}
+
+static void
+_glx_swap_buffers (void *abstract_ctx,
+ cairo_gl_surface_t *abstract_surface)
+{
+ cairo_glx_context_t *ctx = abstract_ctx;
+ cairo_glx_surface_t *surface = (cairo_glx_surface_t *) abstract_surface;
+
+ glXSwapBuffers (ctx->display, surface->win);
+}
+
+static void
+_glx_destroy (void *abstract_ctx)
+{
+ cairo_glx_context_t *ctx = abstract_ctx;
+
+ if (ctx->dummy_window != None)
+ XDestroyWindow (ctx->display, ctx->dummy_window);
+
+ glXMakeCurrent (ctx->display, None, None);
+}
+
+static cairo_status_t
+_glx_dummy_window (Display *dpy, GLXContext gl_ctx, Window *dummy)
+{
+ int attr[3] = { GLX_FBCONFIG_ID, 0, None };
+ GLXFBConfig *config;
+ XVisualInfo *vi;
+ Colormap cmap;
+ XSetWindowAttributes swa;
+ Window win = None;
+ int cnt;
+
+ /* Create a dummy window created for the target GLX context that we can
+ * use to query the available GL/GLX extensions.
+ */
+ glXQueryContext (dpy, gl_ctx, GLX_FBCONFIG_ID, &attr[1]);
+
+ cnt = 0;
+ config = glXChooseFBConfig (dpy, DefaultScreen (dpy), attr, &cnt);
+ if (unlikely (cnt == 0))
+ return _cairo_error (CAIRO_STATUS_INVALID_FORMAT);
+
+ vi = glXGetVisualFromFBConfig (dpy, config[0]);
+ XFree (config);
+
+ if (unlikely (vi == NULL))
+ return _cairo_error (CAIRO_STATUS_INVALID_FORMAT);
+
+ cmap = XCreateColormap (dpy,
+ RootWindow (dpy, vi->screen),
+ vi->visual,
+ AllocNone);
+ swa.colormap = cmap;
+ swa.border_pixel = 0;
+ win = XCreateWindow (dpy, RootWindow (dpy, vi->screen),
+ -1, -1, 1, 1, 0,
+ vi->depth,
+ InputOutput,
+ vi->visual,
+ CWBorderPixel | CWColormap, &swa);
+ XFreeColormap (dpy, cmap);
+ XFree (vi);
+
+ XFlush (dpy);
+ if (unlikely (! glXMakeCurrent (dpy, win, gl_ctx))) {
+ XDestroyWindow (dpy, win);
+ return _cairo_error (CAIRO_STATUS_NO_MEMORY);
+ }
+
+ *dummy = win;
+ return CAIRO_STATUS_SUCCESS;
+}
+
+cairo_device_t *
+cairo_glx_device_create (Display *dpy, GLXContext gl_ctx)
+{
+ cairo_glx_context_t *ctx;
+ cairo_status_t status;
+ Window dummy = None;
+ const char *glx_extensions;
+
+ ctx = calloc (1, sizeof (cairo_glx_context_t));
+ if (unlikely (ctx == NULL))
+ return _cairo_gl_context_create_in_error (CAIRO_STATUS_NO_MEMORY);
+
+ /* glx_dummy_window will call glXMakeCurrent, so we need to
+ * query the current state of the context now. */
+ _glx_query_current_state (ctx);
+
+ status = _glx_dummy_window (dpy, gl_ctx, &dummy);
+ if (unlikely (status)) {
+ free (ctx);
+ return _cairo_gl_context_create_in_error (status);
+ }
+
+ ctx->display = dpy;
+ ctx->dummy_window = dummy;
+ ctx->context = gl_ctx;
+
+ ctx->base.acquire = _glx_acquire;
+ ctx->base.release = _glx_release;
+ ctx->base.make_current = _glx_make_current;
+ ctx->base.swap_buffers = _glx_swap_buffers;
+ ctx->base.destroy = _glx_destroy;
+
+ status = _cairo_gl_dispatch_init (&ctx->base.dispatch,
+ (cairo_gl_get_proc_addr_func_t) glXGetProcAddress);
+ if (unlikely (status)) {
+ free (ctx);
+ return _cairo_gl_context_create_in_error (status);
+ }
+
+ status = _cairo_gl_context_init (&ctx->base);
+ if (unlikely (status)) {
+ free (ctx);
+ return _cairo_gl_context_create_in_error (status);
+ }
+
+ glx_extensions = glXQueryExtensionsString (dpy, DefaultScreen (dpy));
+ if (strstr(glx_extensions, "GLX_MESA_multithread_makecurrent")) {
+ ctx->has_multithread_makecurrent = TRUE;
+ }
+
+ ctx->base.release (ctx);
+
+ return &ctx->base.base;
+}
+
+Display *
+cairo_glx_device_get_display (cairo_device_t *device)
+{
+ cairo_glx_context_t *ctx;
+
+ if (device->backend->type != CAIRO_DEVICE_TYPE_GL) {
+ _cairo_error_throw (CAIRO_STATUS_DEVICE_TYPE_MISMATCH);
+ return NULL;
+ }
+
+ ctx = (cairo_glx_context_t *) device;
+
+ return ctx->display;
+}
+
+GLXContext
+cairo_glx_device_get_context (cairo_device_t *device)
+{
+ cairo_glx_context_t *ctx;
+
+ if (device->backend->type != CAIRO_DEVICE_TYPE_GL) {
+ _cairo_error_throw (CAIRO_STATUS_DEVICE_TYPE_MISMATCH);
+ return NULL;
+ }
+
+ ctx = (cairo_glx_context_t *) device;
+
+ return ctx->context;
+}
+
+cairo_surface_t *
+cairo_gl_surface_create_for_window (cairo_device_t *device,
+ Window win,
+ int width,
+ int height)
+{
+ cairo_glx_surface_t *surface;
+
+ if (unlikely (device->status))
+ return _cairo_surface_create_in_error (device->status);
+
+ if (device->backend->type != CAIRO_DEVICE_TYPE_GL)
+ return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH));
+
+ if (width <= 0 || height <= 0)
+ return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_SIZE));
+
+ surface = calloc (1, sizeof (cairo_glx_surface_t));
+ if (unlikely (surface == NULL))
+ return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
+
+ _cairo_gl_surface_init (device, &surface->base,
+ CAIRO_CONTENT_COLOR_ALPHA, width, height);
+ surface->win = win;
+
+ return &surface->base.base;
+}