| /* 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; |
| |
| 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 void |
| _glx_acquire (void *abstract_ctx) |
| { |
| cairo_glx_context_t *ctx = abstract_ctx; |
| GLXDrawable current_drawable; |
| |
| if (ctx->base.current_target == NULL || |
| _cairo_gl_surface_is_texture (ctx->base.current_target)) { |
| current_drawable = ctx->dummy_window; |
| } else { |
| cairo_glx_surface_t *surface = (cairo_glx_surface_t *) ctx->base.current_target; |
| current_drawable = surface->win; |
| } |
| |
| 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) { |
| 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, 0, 0); |
| } |
| |
| static cairo_status_t |
| _glx_dummy_ctx (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; |
| |
| status = _glx_dummy_ctx (dpy, gl_ctx, &dummy); |
| if (unlikely (status)) |
| return _cairo_gl_context_create_in_error (status); |
| |
| ctx = calloc (1, sizeof (cairo_glx_context_t)); |
| if (unlikely (ctx == NULL)) |
| return _cairo_gl_context_create_in_error (CAIRO_STATUS_NO_MEMORY); |
| |
| 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)); |
| |
| 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; |
| } |