upload sdk

git-svn-id: svn://kolibrios.org@4349 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/cairo/src/cairo-glx-context.c

@@ -0,0 +1,324 @@
+/* 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;
+}