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  1. /* cairo - a vector graphics library with display and print output
  2.  *
  3.  * Copyright © 2009 Eric Anholt
  4.  * Copyright © 2009 Chris Wilson
  5.  * Copyright © 2005 Red Hat, Inc
  6.  *
  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.
  14.  *
  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
  20.  *
  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/
  25.  *
  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.
  29.  *
  30.  * The Original Code is the cairo graphics library.
  31.  *
  32.  * The Initial Developer of the Original Code is Red Hat, Inc.
  33.  *
  34.  * Contributor(s):
  35.  *      Carl Worth <cworth@cworth.org>
  36.  *      Chris Wilson <chris@chris-wilson.co.uk>
  37.  */
  38.  
  39. #include "cairoint.h"
  40.  
  41. #include "cairo-gl-private.h"
  42.  
  43. #include "cairo-error-private.h"
  44.  
  45. #include <X11/Xutil.h>
  46.  
  47. /* XXX needs hooking into XCloseDisplay() */
  48.  
  49. typedef struct _cairo_glx_context {
  50.     cairo_gl_context_t base;
  51.  
  52.     Display *display;
  53.     Window dummy_window;
  54.     GLXContext context;
  55.  
  56.     GLXDrawable previous_drawable;
  57.     GLXContext previous_context;
  58.  
  59.     cairo_bool_t has_multithread_makecurrent;
  60. } cairo_glx_context_t;
  61.  
  62. typedef struct _cairo_glx_surface {
  63.     cairo_gl_surface_t base;
  64.  
  65.     Window win;
  66. } cairo_glx_surface_t;
  67.  
  68. static cairo_bool_t
  69. _context_acquisition_changed_glx_state (cairo_glx_context_t *ctx,
  70.                                         GLXDrawable current_drawable)
  71. {
  72.     return ctx->previous_drawable != current_drawable ||
  73.            ctx->previous_context != ctx->context;
  74. }
  75.  
  76. static GLXDrawable
  77. _glx_get_current_drawable (cairo_glx_context_t *ctx)
  78. {
  79.     if (ctx->base.current_target == NULL ||
  80.         _cairo_gl_surface_is_texture (ctx->base.current_target)) {
  81.         return ctx->dummy_window;
  82.     }
  83.  
  84.     return ((cairo_glx_surface_t *) ctx->base.current_target)->win;
  85. }
  86.  
  87. static void
  88. _glx_query_current_state (cairo_glx_context_t * ctx)
  89. {
  90.     ctx->previous_drawable = glXGetCurrentDrawable ();
  91.     ctx->previous_context = glXGetCurrentContext ();
  92.  
  93.     /* If any of the values were none, assume they are all none. Not all
  94.        drivers seem well behaved when it comes to using these values across
  95.        multiple threads. */
  96.     if (ctx->previous_drawable == None ||
  97.         ctx->previous_context == None) {
  98.         ctx->previous_drawable = None;
  99.         ctx->previous_context = None;
  100.     }
  101. }
  102.  
  103. static void
  104. _glx_acquire (void *abstract_ctx)
  105. {
  106.     cairo_glx_context_t *ctx = abstract_ctx;
  107.     GLXDrawable current_drawable = _glx_get_current_drawable (ctx);
  108.  
  109.     _glx_query_current_state (ctx);
  110.     if (!_context_acquisition_changed_glx_state (ctx, current_drawable))
  111.         return;
  112.  
  113.     glXMakeCurrent (ctx->display, current_drawable, ctx->context);
  114. }
  115.  
  116. static void
  117. _glx_make_current (void *abstract_ctx, cairo_gl_surface_t *abstract_surface)
  118. {
  119.     cairo_glx_context_t *ctx = abstract_ctx;
  120.     cairo_glx_surface_t *surface = (cairo_glx_surface_t *) abstract_surface;
  121.  
  122.     /* Set the window as the target of our context. */
  123.     glXMakeCurrent (ctx->display, surface->win, ctx->context);
  124. }
  125.  
  126. static void
  127. _glx_release (void *abstract_ctx)
  128. {
  129.     cairo_glx_context_t *ctx = abstract_ctx;
  130.  
  131.     if (ctx->has_multithread_makecurrent || !ctx->base.thread_aware ||
  132.         !_context_acquisition_changed_glx_state (ctx,
  133.                                                 _glx_get_current_drawable (ctx))) {
  134.         return;
  135.     }
  136.  
  137.     glXMakeCurrent (ctx->display, None, None);
  138. }
  139.  
  140. static void
  141. _glx_swap_buffers (void *abstract_ctx,
  142.                    cairo_gl_surface_t *abstract_surface)
  143. {
  144.     cairo_glx_context_t *ctx = abstract_ctx;
  145.     cairo_glx_surface_t *surface = (cairo_glx_surface_t *) abstract_surface;
  146.  
  147.     glXSwapBuffers (ctx->display, surface->win);
  148. }
  149.  
  150. static void
  151. _glx_destroy (void *abstract_ctx)
  152. {
  153.     cairo_glx_context_t *ctx = abstract_ctx;
  154.  
  155.     if (ctx->dummy_window != None)
  156.         XDestroyWindow (ctx->display, ctx->dummy_window);
  157.  
  158.     glXMakeCurrent (ctx->display, None, None);
  159. }
  160.  
  161. static cairo_status_t
  162. _glx_dummy_window (Display *dpy, GLXContext gl_ctx, Window *dummy)
  163. {
  164.     int attr[3] = { GLX_FBCONFIG_ID, 0, None };
  165.     GLXFBConfig *config;
  166.     XVisualInfo *vi;
  167.     Colormap cmap;
  168.     XSetWindowAttributes swa;
  169.     Window win = None;
  170.     int cnt;
  171.  
  172.     /* Create a dummy window created for the target GLX context that we can
  173.      * use to query the available GL/GLX extensions.
  174.      */
  175.     glXQueryContext (dpy, gl_ctx, GLX_FBCONFIG_ID, &attr[1]);
  176.  
  177.     cnt = 0;
  178.     config = glXChooseFBConfig (dpy, DefaultScreen (dpy), attr, &cnt);
  179.     if (unlikely (cnt == 0))
  180.         return _cairo_error (CAIRO_STATUS_INVALID_FORMAT);
  181.  
  182.     vi = glXGetVisualFromFBConfig (dpy, config[0]);
  183.     XFree (config);
  184.  
  185.     if (unlikely (vi == NULL))
  186.         return _cairo_error (CAIRO_STATUS_INVALID_FORMAT);
  187.  
  188.     cmap = XCreateColormap (dpy,
  189.                             RootWindow (dpy, vi->screen),
  190.                             vi->visual,
  191.                             AllocNone);
  192.     swa.colormap = cmap;
  193.     swa.border_pixel = 0;
  194.     win = XCreateWindow (dpy, RootWindow (dpy, vi->screen),
  195.                          -1, -1, 1, 1, 0,
  196.                          vi->depth,
  197.                          InputOutput,
  198.                          vi->visual,
  199.                          CWBorderPixel | CWColormap, &swa);
  200.     XFreeColormap (dpy, cmap);
  201.     XFree (vi);
  202.  
  203.     XFlush (dpy);
  204.     if (unlikely (! glXMakeCurrent (dpy, win, gl_ctx))) {
  205.         XDestroyWindow (dpy, win);
  206.         return _cairo_error (CAIRO_STATUS_NO_MEMORY);
  207.     }
  208.  
  209.     *dummy = win;
  210.     return CAIRO_STATUS_SUCCESS;
  211. }
  212.  
  213. cairo_device_t *
  214. cairo_glx_device_create (Display *dpy, GLXContext gl_ctx)
  215. {
  216.     cairo_glx_context_t *ctx;
  217.     cairo_status_t status;
  218.     Window dummy = None;
  219.     const char *glx_extensions;
  220.  
  221.     ctx = calloc (1, sizeof (cairo_glx_context_t));
  222.     if (unlikely (ctx == NULL))
  223.         return _cairo_gl_context_create_in_error (CAIRO_STATUS_NO_MEMORY);
  224.  
  225.     /* glx_dummy_window will call glXMakeCurrent, so we need to
  226.      *  query the current state of the context now. */
  227.     _glx_query_current_state (ctx);
  228.  
  229.     status = _glx_dummy_window (dpy, gl_ctx, &dummy);
  230.     if (unlikely (status)) {
  231.         free (ctx);
  232.         return _cairo_gl_context_create_in_error (status);
  233.     }
  234.  
  235.     ctx->display = dpy;
  236.     ctx->dummy_window = dummy;
  237.     ctx->context = gl_ctx;
  238.  
  239.     ctx->base.acquire = _glx_acquire;
  240.     ctx->base.release = _glx_release;
  241.     ctx->base.make_current = _glx_make_current;
  242.     ctx->base.swap_buffers = _glx_swap_buffers;
  243.     ctx->base.destroy = _glx_destroy;
  244.  
  245.     status = _cairo_gl_dispatch_init (&ctx->base.dispatch,
  246.                                       (cairo_gl_get_proc_addr_func_t) glXGetProcAddress);
  247.     if (unlikely (status)) {
  248.         free (ctx);
  249.         return _cairo_gl_context_create_in_error (status);
  250.     }
  251.  
  252.     status = _cairo_gl_context_init (&ctx->base);
  253.     if (unlikely (status)) {
  254.         free (ctx);
  255.         return _cairo_gl_context_create_in_error (status);
  256.     }
  257.  
  258.     glx_extensions = glXQueryExtensionsString (dpy, DefaultScreen (dpy));
  259.     if (strstr(glx_extensions, "GLX_MESA_multithread_makecurrent")) {
  260.         ctx->has_multithread_makecurrent = TRUE;
  261.     }
  262.  
  263.     ctx->base.release (ctx);
  264.  
  265.     return &ctx->base.base;
  266. }
  267.  
  268. Display *
  269. cairo_glx_device_get_display (cairo_device_t *device)
  270. {
  271.     cairo_glx_context_t *ctx;
  272.  
  273.     if (device->backend->type != CAIRO_DEVICE_TYPE_GL) {
  274.         _cairo_error_throw (CAIRO_STATUS_DEVICE_TYPE_MISMATCH);
  275.         return NULL;
  276.     }
  277.  
  278.     ctx = (cairo_glx_context_t *) device;
  279.  
  280.     return ctx->display;
  281. }
  282.  
  283. GLXContext
  284. cairo_glx_device_get_context (cairo_device_t *device)
  285. {
  286.     cairo_glx_context_t *ctx;
  287.  
  288.     if (device->backend->type != CAIRO_DEVICE_TYPE_GL) {
  289.         _cairo_error_throw (CAIRO_STATUS_DEVICE_TYPE_MISMATCH);
  290.         return NULL;
  291.     }
  292.  
  293.     ctx = (cairo_glx_context_t *) device;
  294.  
  295.     return ctx->context;
  296. }
  297.  
  298. cairo_surface_t *
  299. cairo_gl_surface_create_for_window (cairo_device_t      *device,
  300.                                     Window               win,
  301.                                     int                  width,
  302.                                     int                  height)
  303. {
  304.     cairo_glx_surface_t *surface;
  305.  
  306.     if (unlikely (device->status))
  307.         return _cairo_surface_create_in_error (device->status);
  308.  
  309.     if (device->backend->type != CAIRO_DEVICE_TYPE_GL)
  310.         return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH));
  311.  
  312.     if (width <= 0 || height <= 0)
  313.         return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_SIZE));
  314.  
  315.     surface = calloc (1, sizeof (cairo_glx_surface_t));
  316.     if (unlikely (surface == NULL))
  317.         return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
  318.  
  319.     _cairo_gl_surface_init (device, &surface->base,
  320.                             CAIRO_CONTENT_COLOR_ALPHA, width, height);
  321.     surface->win = win;
  322.  
  323.     return &surface->base.base;
  324. }
  325.