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d40cdfa3e1
mutter/cogl/winsys/cogl-winsys-glx.c
Robert Bragg d40cdfa3e1 Moves all GLX code down from Clutter to Cogl 
This migrates all the GLX window system code down from the Clutter
backend code into a Cogl winsys. Moving OpenGL window system binding
code down from Clutter into Cogl is the biggest blocker to having Cogl
become a standalone 3D graphics library, so this is an important step in
that direction.
2011-04-11 17:54:36 +01:00

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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2007,2008,2009,2010,2011 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*
*
* Authors:
* Robert Bragg <robert@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl.h"
#include "cogl-winsys-private.h"
#include "cogl-feature-private.h"
#include "cogl-context-private.h"
#include "cogl-framebuffer.h"
#include "cogl-swap-chain-private.h"
#include "cogl-renderer-private.h"
#include "cogl-renderer-glx-private.h"
#include "cogl-onscreen-template-private.h"
#include "cogl-display-xlib-private.h"
#include "cogl-display-glx-private.h"
#include "cogl-private.h"
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <glib/gi18n-lib.h>
#include <dlfcn.h>
#include <GL/glx.h>
#include <X11/Xlib.h>
typedef CoglFuncPtr (*GLXGetProcAddressProc) (const GLubyte *procName);
#ifdef HAVE_DRM
#include <drm.h>
#include <sys/ioctl.h>
#include <errno.h>
#endif
typedef struct _CoglContextGLX
{
GLXDrawable current_drawable;
} CoglContextGLX;
typedef struct _CoglOnscreenXlib
{
Window xwin;
gboolean is_foreign_xwin;
} CoglOnscreenXlib;
typedef struct _CoglOnscreenGLX
{
CoglOnscreenXlib _parent;
GLXDrawable glxwin;
guint32 last_swap_vsync_counter;
GList *swap_callbacks;
} CoglOnscreenGLX;
typedef struct _CoglSwapBuffersNotifyEntry
{
CoglSwapBuffersNotify callback;
void *user_data;
unsigned int id;
} CoglSwapBuffersNotifyEntry;
/* Define a set of arrays containing the functions required from GL
for each winsys feature */
#define COGL_WINSYS_FEATURE_BEGIN(name, namespaces, extension_names, \
feature_flags, feature_flags_private, \
winsys_feature) \
static const CoglFeatureFunction \
cogl_glx_feature_ ## name ## _funcs[] = {
#define COGL_WINSYS_FEATURE_FUNCTION(ret, name, args) \
{ G_STRINGIFY (name), G_STRUCT_OFFSET (CoglRendererGLX, pf_ ## name) },
#define COGL_WINSYS_FEATURE_END() \
{ NULL, 0 }, \
};
#include "cogl-winsys-glx-feature-functions.h"
/* Define an array of features */
#undef COGL_WINSYS_FEATURE_BEGIN
#define COGL_WINSYS_FEATURE_BEGIN(name, namespaces, extension_names, \
feature_flags, feature_flags_private, \
winsys_feature) \
{ 255, 255, namespaces, extension_names, \
feature_flags, feature_flags_private, \
winsys_feature, \
cogl_glx_feature_ ## name ## _funcs },
#undef COGL_WINSYS_FEATURE_FUNCTION
#define COGL_WINSYS_FEATURE_FUNCTION(ret, name, args)
#undef COGL_WINSYS_FEATURE_END
#define COGL_WINSYS_FEATURE_END()
static const CoglFeatureData winsys_feature_data[] =
{
#include "cogl-winsys-glx-feature-functions.h"
};
CoglFuncPtr
_cogl_winsys_get_proc_address (const char *name)
{
static GLXGetProcAddressProc get_proc_func = NULL;
static void *dlhand = NULL;
if (get_proc_func == NULL && dlhand == NULL)
{
dlhand = dlopen (NULL, RTLD_LAZY);
if (!dlhand)
{
g_warning ("Failed to dlopen (NULL, RTDL_LAZY): %s", dlerror ());
return NULL;
}
dlerror ();
get_proc_func =
(GLXGetProcAddressProc) dlsym (dlhand, "glXGetProcAddress");
if (dlerror () != NULL)
{
get_proc_func =
(GLXGetProcAddressProc) dlsym (dlhand, "glXGetProcAddressARB");
}
if (dlerror () != NULL)
{
get_proc_func = NULL;
g_warning ("failed to bind GLXGetProcAddress "
"or GLXGetProcAddressARB");
}
}
if (get_proc_func)
return get_proc_func ((GLubyte *) name);
return NULL;
}
#undef COGL_WINSYS_FEATURE_BEGIN
#define COGL_WINSYS_FEATURE_BEGIN(a, b, c, d, e, f)
#undef COGL_WINSYS_FEATURE_FUNCTION
#define COGL_WINSYS_FEATURE_FUNCTION(ret, name, args) \
glx_renderer->pf_ ## name = NULL;
#undef COGL_WINSYS_FEATURE_END
#define COGL_WINSYS_FEATURE_END()
static void
initialize_function_table (CoglRenderer *renderer)
{
CoglRendererGLX *glx_renderer = renderer->winsys;
#include "cogl-winsys-glx-feature-functions.h"
}
static CoglOnscreen *
find_onscreen_for_xid (CoglContext *context, guint32 xid)
{
GList *l;
for (l = context->framebuffers; l; l = l->next)
{
CoglFramebuffer *framebuffer = l->data;
CoglOnscreenXlib *xlib_onscreen;
if (!framebuffer->type == COGL_FRAMEBUFFER_TYPE_ONSCREEN)
continue;
/* Does the GLXEvent have the GLXDrawable or the X Window? */
xlib_onscreen = COGL_ONSCREEN (framebuffer)->winsys;
if (xlib_onscreen->xwin == (Window)xid)
return COGL_ONSCREEN (framebuffer);
}
return NULL;
}
static void
notify_swap_buffers (CoglContext *context, GLXDrawable drawable)
{
CoglOnscreen *onscreen = find_onscreen_for_xid (context, (guint32)drawable);
CoglOnscreenGLX *glx_onscreen;
GList *l;
if (!onscreen)
return;
glx_onscreen = onscreen->winsys;
for (l = glx_onscreen->swap_callbacks; l; l = l->next)
{
CoglSwapBuffersNotifyEntry *entry = l->data;
entry->callback (COGL_FRAMEBUFFER (onscreen), entry->user_data);
}
}
static CoglXlibFilterReturn
glx_event_filter_cb (XEvent *xevent, void *data)
{
CoglContext *context = data;
CoglRendererGLX *glx_renderer = context->display->renderer->winsys;
if (xevent->type == ConfigureNotify)
{
CoglOnscreen *onscreen =
find_onscreen_for_xid (context, xevent->xconfigure.window);
if (onscreen)
{
CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
_cogl_framebuffer_winsys_update_size (framebuffer,
xevent->xconfigure.width,
xevent->xconfigure.height);
}
}
else if (xevent->type ==
(glx_renderer->glx_event_base + GLX_BufferSwapComplete))
{
GLXBufferSwapComplete *swap_event = (GLXBufferSwapComplete *)xevent;
notify_swap_buffers (context, swap_event->drawable);
return COGL_XLIB_FILTER_REMOVE;
}
return COGL_XLIB_FILTER_CONTINUE;
}
gboolean
_cogl_winsys_renderer_connect (CoglRenderer *renderer,
GError **error)
{
CoglRendererGLX *glx_renderer;
CoglRendererXlib *xlib_renderer;
renderer->winsys = g_slice_new0 (CoglRendererGLX);
glx_renderer = renderer->winsys;
xlib_renderer = renderer->winsys;
if (!_cogl_renderer_xlib_connect (renderer, error))
goto error;
if (!glXQueryExtension (xlib_renderer->xdpy,
&glx_renderer->glx_error_base,
&glx_renderer->glx_event_base))
{
g_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_INIT,
"XServer appears to lack required GLX support");
goto error;
}
/* XXX: Note: For a long time Mesa exported a hybrid GLX, exporting
* extensions specified to require GLX 1.3, but still reporting 1.2
* via glXQueryVersion. */
if (!glXQueryVersion (xlib_renderer->xdpy,
&glx_renderer->glx_major,
&glx_renderer->glx_minor)
|| !(glx_renderer->glx_major == 1 && glx_renderer->glx_minor >= 2))
{
g_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_INIT,
"XServer appears to lack required GLX 1.2 support");
goto error;
}
glx_renderer->dri_fd = -1;
return TRUE;
error:
_cogl_winsys_renderer_disconnect (renderer);
return FALSE;
}
void
_cogl_winsys_renderer_disconnect (CoglRenderer *renderer)
{
_cogl_renderer_xlib_disconnect (renderer);
g_slice_free (CoglRendererGLX, renderer->winsys);
}
void
update_winsys_features (CoglContext *context)
{
CoglDisplayGLX *glx_display = context->display->winsys;
CoglRendererXlib *xlib_renderer = context->display->renderer->winsys;
CoglRendererGLX *glx_renderer = context->display->renderer->winsys;
const char *glx_extensions;
int i;
g_return_if_fail (glx_display->glx_context);
_cogl_gl_update_features (context);
_cogl_bitmask_init (&context->winsys_features);
glx_extensions =
glXQueryExtensionsString (xlib_renderer->xdpy,
DefaultScreen (xlib_renderer->xdpy));
COGL_NOTE (WINSYS, " GLX Extensions: %s", glx_extensions);
context->feature_flags |= COGL_FEATURE_ONSCREEN_MULTIPLE;
_cogl_bitmask_set (&context->winsys_features,
COGL_WINSYS_FEATURE_MULTIPLE_ONSCREEN,
TRUE);
initialize_function_table (context->display->renderer);
for (i = 0; i < G_N_ELEMENTS (winsys_feature_data); i++)
if (_cogl_feature_check ("GLX", winsys_feature_data + i, 0, 0,
glx_extensions,
glx_renderer))
{
context->feature_flags |= winsys_feature_data[i].feature_flags;
if (winsys_feature_data[i].winsys_feature)
_cogl_bitmask_set (&context->winsys_features,
winsys_feature_data[i].winsys_feature,
TRUE);
}
/* Note: the GLX_SGI_video_sync spec explicitly states this extension
* only works for direct contexts. */
if (!glx_renderer->is_direct)
{
glx_renderer->pf_glXGetVideoSync = NULL;
glx_renderer->pf_glXWaitVideoSync = NULL;
}
if (glx_renderer->pf_glXWaitVideoSync)
_cogl_bitmask_set (&context->winsys_features,
COGL_WINSYS_FEATURE_VBLANK_WAIT,
TRUE);
#ifdef HAVE_DRM
/* drm is really an extreme fallback -rumoured to work with Via
* chipsets... */
if (!glx_renderer->pf_glXWaitVideoSync)
{
if (glx_renderer->dri_fd < 0)
glx_renderer->dri_fd = open("/dev/dri/card0", O_RDWR);
if (glx_renderer->dri_fd >= 0)
_cogl_bitmask_set (&context->winsys_features,
COGL_WINSYS_FEATURE_VBLANK_WAIT,
TRUE);
}
#endif
if (glx_renderer->pf_glXCopySubBuffer || context->drv.pf_glBlitFramebuffer)
_cogl_bitmask_set (&context->winsys_features,
COGL_WINSYS_FEATURE_SWAP_REGION, TRUE);
/* Note: glXCopySubBuffer and glBlitFramebuffer won't be throttled
* by the SwapInterval so we have to throttle swap_region requests
* manually... */
if (_cogl_winsys_has_feature (COGL_WINSYS_FEATURE_SWAP_REGION) &&
_cogl_winsys_has_feature (COGL_WINSYS_FEATURE_VBLANK_WAIT))
_cogl_bitmask_set (&context->winsys_features,
COGL_WINSYS_FEATURE_SWAP_REGION_THROTTLE, TRUE);
}
/* It seems the GLX spec never defined an invalid GLXFBConfig that
* we could overload as an indication of error, so we have to return
* an explicit boolean status. */
static gboolean
find_fbconfig (CoglDisplay *display,
gboolean with_alpha,
GLXFBConfig *config_ret,
GError **error)
{
CoglRendererXlib *xlib_renderer = display->renderer->winsys;
GLXFBConfig *configs = NULL;
int n_configs, i;
static const int attributes[] = {
GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
GLX_RENDER_TYPE, GLX_RGBA_BIT,
GLX_DOUBLEBUFFER, GL_TRUE,
GLX_RED_SIZE, 1,
GLX_GREEN_SIZE, 1,
GLX_BLUE_SIZE, 1,
GLX_ALPHA_SIZE, 1,
GLX_DEPTH_SIZE, 1,
GLX_STENCIL_SIZE, 1,
None
};
gboolean ret = TRUE;
int xscreen_num = DefaultScreen (xlib_renderer->xdpy);
configs = glXChooseFBConfig (xlib_renderer->xdpy,
xscreen_num,
attributes,
&n_configs);
if (!configs || n_configs == 0)
{
g_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_CONTEXT,
"Failed to find any compatible fbconfigs");
ret = FALSE;
goto done;
}
if (with_alpha)
{
for (i = 0; i < n_configs; i++)
{
XVisualInfo *vinfo;
vinfo = glXGetVisualFromFBConfig (xlib_renderer->xdpy, configs[i]);
if (vinfo == NULL)
continue;
if (vinfo->depth == 32 &&
(vinfo->red_mask | vinfo->green_mask | vinfo->blue_mask)
!= 0xffffffff)
{
COGL_NOTE (WINSYS, "Found an ARGB FBConfig [index:%d]", i);
*config_ret = configs[i];
goto done;
}
}
/* If we make it here then we didn't find an RGBA config so
we'll fall back to using an RGB config */
g_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_CONTEXT,
"Unable to find fbconfig with rgba visual");
ret = FALSE;
goto done;
}
else
{
COGL_NOTE (WINSYS, "Using the first available FBConfig");
*config_ret = configs[0];
}
done:
XFree (configs);
return ret;
}
static gboolean
create_context (CoglDisplay *display, GError **error)
{
CoglDisplayGLX *glx_display = display->winsys;
CoglDisplayXlib *xlib_display = display->winsys;
CoglRendererXlib *xlib_renderer = display->renderer->winsys;
CoglRendererGLX *glx_renderer = display->renderer->winsys;
gboolean support_transparent_windows;
GLXFBConfig config;
GError *fbconfig_error = NULL;
XSetWindowAttributes attrs;
XVisualInfo *xvisinfo;
GLXDrawable dummy_drawable;
CoglXlibTrapState old_state;
g_return_val_if_fail (glx_display->glx_context == NULL, TRUE);
if (display->onscreen_template &&
display->onscreen_template->swap_chain &&
display->onscreen_template->swap_chain->has_alpha)
support_transparent_windows = TRUE;
else
support_transparent_windows = FALSE;
glx_display->found_fbconfig =
find_fbconfig (display, support_transparent_windows, &config,
&fbconfig_error);
if (!glx_display->found_fbconfig)
{
g_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_CONTEXT,
"Unable to find suitable fbconfig for the GLX context: %s",
fbconfig_error->message);
g_error_free (fbconfig_error);
return FALSE;
}
glx_display->fbconfig = config;
glx_display->fbconfig_has_rgba_visual = support_transparent_windows;
COGL_NOTE (WINSYS, "Creating GLX Context (display: %p)",
xlib_renderer->xdpy);
glx_display->glx_context = glXCreateNewContext (xlib_renderer->xdpy,
config,
GLX_RGBA_TYPE,
NULL,
True);
if (glx_display->glx_context == NULL)
{
g_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_CONTEXT,
"Unable to create suitable GL context");
return FALSE;
}
glx_renderer->is_direct =
glXIsDirect (xlib_renderer->xdpy, glx_display->glx_context);
COGL_NOTE (WINSYS, "Setting %s context",
glx_renderer->is_direct ? "direct" : "indirect");
/* XXX: GLX doesn't let us make a context current without a window
* so we create a dummy window that we can use while no CoglOnscreen
* framebuffer is in use.
*/
xvisinfo = glXGetVisualFromFBConfig (xlib_renderer->xdpy, config);
if (xvisinfo == NULL)
{
g_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_CONTEXT,
"Unable to retrieve the X11 visual");
return FALSE;
}
_cogl_renderer_xlib_trap_errors (display->renderer, &old_state);
attrs.override_redirect = True;
attrs.colormap = XCreateColormap (xlib_renderer->xdpy,
DefaultRootWindow (xlib_renderer->xdpy),
xvisinfo->visual,
AllocNone);
attrs.border_pixel = 0;
xlib_display->dummy_xwin =
XCreateWindow (xlib_renderer->xdpy,
DefaultRootWindow (xlib_renderer->xdpy),
-100, -100, 1, 1,
0,
xvisinfo->depth,
CopyFromParent,
xvisinfo->visual,
CWOverrideRedirect | CWColormap | CWBorderPixel,
&attrs);
/* Try and create a GLXWindow to use with extensions dependent on
* GLX versions >= 1.3 that don't accept regular X Windows as GLX
* drawables. */
if (glx_renderer->glx_major == 1 && glx_renderer->glx_minor >= 3)
{
glx_display->dummy_glxwin = glXCreateWindow (xlib_renderer->xdpy,
config,
xlib_display->dummy_xwin,
NULL);
}
if (glx_display->dummy_glxwin)
dummy_drawable = glx_display->dummy_glxwin;
else
dummy_drawable = xlib_display->dummy_xwin;
COGL_NOTE (WINSYS, "Selecting dummy 0x%x for the GLX context",
(unsigned int) dummy_drawable);
glXMakeContextCurrent (xlib_renderer->xdpy,
dummy_drawable,
dummy_drawable,
glx_display->glx_context);
XFree (xvisinfo);
if (_cogl_renderer_xlib_untrap_errors (display->renderer, &old_state))
{
g_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_CONTEXT,
"Unable to select the newly created GLX context");
return FALSE;
}
return TRUE;
}
gboolean
_cogl_winsys_display_setup (CoglDisplay *display,
GError **error)
{
CoglDisplayGLX *glx_display;
CoglDisplayXlib *xlib_display;
int i;
g_return_val_if_fail (display->winsys == NULL, FALSE);
glx_display = g_slice_new0 (CoglDisplayGLX);
display->winsys = glx_display;
xlib_display = display->winsys;
if (!create_context (display, error))
goto error;
for (i = 0; i < COGL_GLX_N_CACHED_CONFIGS; i++)
glx_display->glx_cached_configs[i].depth = -1;
return TRUE;
error:
_cogl_winsys_display_destroy (display);
return FALSE;
}
void
_cogl_winsys_display_destroy (CoglDisplay *display)
{
CoglDisplayGLX *glx_display = display->winsys;
CoglDisplayXlib *xlib_display = display->winsys;
CoglRendererXlib *xlib_renderer = display->renderer->winsys;
g_return_if_fail (glx_display != NULL);
if (glx_display->glx_context)
{
glXMakeContextCurrent (xlib_renderer->xdpy, None, None, NULL);
glXDestroyContext (xlib_renderer->xdpy, glx_display->glx_context);
glx_display->glx_context = NULL;
}
if (glx_display->dummy_glxwin)
{
glXDestroyWindow (xlib_renderer->xdpy, glx_display->dummy_glxwin);
glx_display->dummy_glxwin = None;
}
if (xlib_display->dummy_xwin)
{
XDestroyWindow (xlib_renderer->xdpy, xlib_display->dummy_xwin);
xlib_display->dummy_xwin = None;
}
g_slice_free (CoglDisplayGLX, display->winsys);
display->winsys = NULL;
}
gboolean
_cogl_winsys_context_init (CoglContext *context, GError **error)
{
context->winsys = g_new0 (CoglContextGLX, 1);
cogl_renderer_xlib_add_filter (context->display->renderer,
glx_event_filter_cb,
context);
update_winsys_features (context);
return TRUE;
}
void
_cogl_winsys_context_deinit (CoglContext *context)
{
cogl_renderer_xlib_remove_filter (context->display->renderer,
glx_event_filter_cb,
context);
g_free (context->winsys);
}
gboolean
_cogl_winsys_onscreen_init (CoglOnscreen *onscreen,
GError **error)
{
CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
CoglContext *context = framebuffer->context;
CoglDisplay *display = context->display;
CoglDisplayGLX *glx_display = display->winsys;
CoglRendererXlib *xlib_renderer = display->renderer->winsys;
CoglRendererGLX *glx_renderer = display->renderer->winsys;
Window xwin;
CoglOnscreenXlib *xlib_onscreen;
CoglOnscreenGLX *glx_onscreen;
g_return_val_if_fail (glx_display->glx_context, FALSE);
/* FIXME: We need to explicitly Select for ConfigureNotify events.
* For foreign windows we need to be careful not to mess up any
* existing event mask.
* We need to document that for windows we create then toolkits
* must be careful not to clear event mask bits that we select.
*/
/* XXX: Note we ignore the user's original width/height when
* given a foreign X window. */
if (onscreen->foreign_xid)
{
Status status;
CoglXlibTrapState state;
XWindowAttributes attr;
int xerror;
xwin = onscreen->foreign_xid;
_cogl_renderer_xlib_trap_errors (display->renderer, &state);
status = XGetWindowAttributes (xlib_renderer->xdpy, xwin, &attr);
XSync (xlib_renderer->xdpy, False);
xerror = _cogl_renderer_xlib_untrap_errors (display->renderer, &state);
if (status == 0 || xerror)
{
char message[1000];
XGetErrorText (xlib_renderer->xdpy, xerror, message, sizeof(message));
g_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_ONSCREEN,
"Unable to query geometry of foreign xid 0x%08lX: %s",
xwin, message);
return FALSE;
}
_cogl_framebuffer_winsys_update_size (framebuffer,
attr.width, attr.height);
}
else
{
int width;
int height;
CoglXlibTrapState state;
XVisualInfo *xvisinfo;
XSetWindowAttributes xattr;
unsigned long mask;
int xerror;
width = _cogl_framebuffer_get_width (framebuffer);
height = _cogl_framebuffer_get_height (framebuffer);
_cogl_renderer_xlib_trap_errors (display->renderer, &state);
xvisinfo = glXGetVisualFromFBConfig (xlib_renderer->xdpy,
glx_display->fbconfig);
if (xvisinfo == NULL)
{
g_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_ONSCREEN,
"Unable to retrieve the X11 visual of context's "
"fbconfig");
return FALSE;
}
/* window attributes */
xattr.background_pixel = WhitePixel (xlib_renderer->xdpy,
DefaultScreen (xlib_renderer->xdpy));
xattr.border_pixel = 0;
/* XXX: is this an X resource that we are leaking‽... */
xattr.colormap = XCreateColormap (xlib_renderer->xdpy,
DefaultRootWindow (xlib_renderer->xdpy),
xvisinfo->visual,
AllocNone);
mask = CWBorderPixel | CWColormap;
xwin = XCreateWindow (xlib_renderer->xdpy,
DefaultRootWindow (xlib_renderer->xdpy),
0, 0,
width, height,
0,
xvisinfo->depth,
InputOutput,
xvisinfo->visual,
mask, &xattr);
XFree (xvisinfo);
XSync (xlib_renderer->xdpy, False);
xerror = _cogl_renderer_xlib_untrap_errors (display->renderer, &state);
if (xerror)
{
char message[1000];
XGetErrorText (xlib_renderer->xdpy, xerror,
message, sizeof (message));
g_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_ONSCREEN,
"X error while creating Window for CoglOnscreen: %s",
message);
return FALSE;
}
}
onscreen->winsys = g_slice_new0 (CoglOnscreenGLX);
xlib_onscreen = onscreen->winsys;
glx_onscreen = onscreen->winsys;
xlib_onscreen->xwin = xwin;
xlib_onscreen->is_foreign_xwin = onscreen->foreign_xid ? TRUE : FALSE;
/* Try and create a GLXWindow to use with extensions dependent on
* GLX versions >= 1.3 that don't accept regular X Windows as GLX
* drawables. */
if (glx_renderer->glx_major == 1 && glx_renderer->glx_minor >= 3)
{
glx_onscreen->glxwin =
glXCreateWindow (xlib_renderer->xdpy,
glx_display->fbconfig,
xlib_onscreen->xwin,
NULL);
}
#ifdef GLX_INTEL_swap_event
if (_cogl_winsys_has_feature (COGL_WINSYS_FEATURE_SWAP_BUFFERS_EVENT))
{
GLXDrawable drawable =
glx_onscreen->glxwin ? glx_onscreen->glxwin : xlib_onscreen->xwin;
/* similarly to above, we unconditionally select this event
* because we rely on it to advance the master clock, and
* drive redraw/relayout, animations and event handling.
*/
glXSelectEvent (xlib_renderer->xdpy,
drawable,
GLX_BUFFER_SWAP_COMPLETE_INTEL_MASK);
}
#endif /* GLX_INTEL_swap_event */
return TRUE;
}
void
_cogl_winsys_onscreen_deinit (CoglOnscreen *onscreen)
{
CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
CoglContext *context = framebuffer->context;
CoglRendererXlib *xlib_renderer = context->display->renderer->winsys;
CoglXlibTrapState old_state;
CoglOnscreenXlib *xlib_onscreen = onscreen->winsys;
CoglOnscreenGLX *glx_onscreen = onscreen->winsys;
_cogl_xlib_trap_errors (&old_state);
if (glx_onscreen->glxwin != None)
{
glXDestroyWindow (xlib_renderer->xdpy, glx_onscreen->glxwin);
glx_onscreen->glxwin = None;
}
if (!xlib_onscreen->is_foreign_xwin && xlib_onscreen->xwin != None)
{
XDestroyWindow (xlib_renderer->xdpy, xlib_onscreen->xwin);
xlib_onscreen->xwin = None;
}
else
xlib_onscreen->xwin = None;
XSync (xlib_renderer->xdpy, False);
_cogl_xlib_untrap_errors (&old_state);
}
void
_cogl_winsys_onscreen_bind (CoglOnscreen *onscreen)
{
CoglContext *context = COGL_FRAMEBUFFER (onscreen)->context;
CoglContextGLX *glx_context = context->winsys;
CoglDisplayXlib *xlib_display = context->display->winsys;
CoglDisplayGLX *glx_display = context->display->winsys;
CoglRendererXlib *xlib_renderer = context->display->renderer->winsys;
CoglRendererGLX *glx_renderer = context->display->renderer->winsys;
CoglOnscreenXlib *xlib_onscreen = onscreen->winsys;
CoglOnscreenGLX *glx_onscreen = onscreen->winsys;
CoglXlibTrapState old_state;
GLXDrawable drawable;
if (G_UNLIKELY (!onscreen))
{
drawable =
glx_display->dummy_glxwin ?
glx_display->dummy_glxwin : xlib_display->dummy_xwin;
if (glx_context->current_drawable == drawable)
return;
_cogl_xlib_trap_errors (&old_state);
glXMakeContextCurrent (xlib_renderer->xdpy,
drawable, drawable,
glx_display->glx_context);
}
else
{
drawable =
glx_onscreen->glxwin ? glx_onscreen->glxwin : xlib_onscreen->xwin;
if (glx_context->current_drawable == drawable)
return;
_cogl_xlib_trap_errors (&old_state);
COGL_NOTE (WINSYS,
"MakeContextCurrent dpy: %p, window: 0x%x (%s), context: %p",
xlib_renderer->xdpy,
(unsigned int) drawable,
xlib_onscreen->is_foreign_xwin ? "foreign" : "native",
glx_display->glx_context);
glXMakeContextCurrent (xlib_renderer->xdpy,
drawable,
drawable,
glx_display->glx_context);
/* In case we are using GLX_SGI_swap_control for vblank syncing
* we need call glXSwapIntervalSGI here to make sure that it
* affects the current drawable.
*
* Note: we explicitly set to 0 when we aren't using the swap
* interval to synchronize since some drivers have a default
* swap interval of 1. Sadly some drivers even ignore requests
* to disable the swap interval.
*
* NB: glXSwapIntervalSGI applies to the context not the
* drawable which is why we can't just do this once when the
* framebuffer is allocated.
*
* FIXME: We should check for GLX_EXT_swap_control which allows
* per framebuffer swap intervals. GLX_MESA_swap_control also
* allows per-framebuffer swap intervals but the semantics tend
* to be more muddled since Mesa drivers tend to expose both the
* MESA and SGI extensions which should technically be mutually
* exclusive.
*/
if (glx_renderer->pf_glXSwapInterval)
{
if (onscreen->swap_throttled)
glx_renderer->pf_glXSwapInterval (1);
else
glx_renderer->pf_glXSwapInterval (0);
}
}
XSync (xlib_renderer->xdpy, False);
/* FIXME: We should be reporting a GError here
*/
if (_cogl_xlib_untrap_errors (&old_state))
{
g_warning ("X Error received while making drawable 0x%08lX current",
drawable);
return;
}
glx_context->current_drawable = drawable;
}
#ifdef HAVE_DRM
static int
drm_wait_vblank (int fd, drm_wait_vblank_t *vbl)
{
int ret, rc;
do
{
ret = ioctl (fd, DRM_IOCTL_WAIT_VBLANK, vbl);
vbl->request.type &= ~_DRM_VBLANK_RELATIVE;
rc = errno;
}
while (ret && rc == EINTR);
return rc;
}
#endif /* HAVE_DRM */
void
_cogl_winsys_wait_for_vblank (void)
{
CoglDisplayGLX *glx_display;
CoglRendererGLX *glx_renderer;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
glx_display = ctx->display->winsys;
glx_renderer = ctx->display->renderer->winsys;
if (glx_renderer->pf_glXGetVideoSync)
{
guint32 current_count;
glx_renderer->pf_glXGetVideoSync (&current_count);
glx_renderer->pf_glXWaitVideoSync (2,
(current_count + 1) % 2,
&current_count);
}
#ifdef HAVE_DRM
else
{
drm_wait_vblank_t blank;
COGL_NOTE (WINSYS, "Waiting for vblank (drm)");
blank.request.type = _DRM_VBLANK_RELATIVE;
blank.request.sequence = 1;
blank.request.signal = 0;
drm_wait_vblank (glx_renderer->dri_fd, &blank);
}
#endif /* HAVE_DRM */
}
void
_cogl_winsys_onscreen_swap_region (CoglOnscreen *onscreen,
int *rectangles,
int n_rectangles)
{
CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
CoglContext *context = framebuffer->context;
CoglRendererXlib *xlib_renderer = context->display->renderer->winsys;
CoglRendererGLX *glx_renderer = context->display->renderer->winsys;
CoglOnscreenXlib *xlib_onscreen = onscreen->winsys;
CoglOnscreenGLX *glx_onscreen = onscreen->winsys;
GLXDrawable drawable =
glx_onscreen->glxwin ? glx_onscreen->glxwin : xlib_onscreen->xwin;
guint32 end_frame_vsync_counter;
gboolean have_counter;
gboolean can_wait;
_cogl_framebuffer_flush_state (framebuffer,
framebuffer,
COGL_FRAMEBUFFER_FLUSH_BIND_ONLY);
if (onscreen->swap_throttled)
{
have_counter =
_cogl_winsys_has_feature (COGL_WINSYS_FEATURE_VBLANK_COUNTER);
can_wait = _cogl_winsys_has_feature (COGL_WINSYS_FEATURE_VBLANK_WAIT);
}
else
{
have_counter = FALSE;
can_wait = FALSE;
}
/* We need to ensure that all the rendering is done, otherwise
* redraw operations that are slower than the framerate can
* queue up in the pipeline during a heavy animation, causing a
* larger and larger backlog of rendering visible as lag to the
* user.
*
* For an exaggerated example consider rendering at 60fps (so 16ms
* per frame) and you have a really slow frame that takes 160ms to
* render, even though painting the scene and issuing the commands
* to the GPU takes no time at all. If all we did was use the
* video_sync extension to throttle the painting done by the CPU
* then every 16ms we would have another frame queued up even though
* the GPU has only rendered one tenth of the current frame. By the
* time the GPU would get to the 2nd frame there would be 9 frames
* waiting to be rendered.
*
* The problem is that we don't currently have a good way to throttle
* the GPU, only the CPU so we have to resort to synchronizing the
* GPU with the CPU to throttle it.
*
* Note: since calling glFinish() and synchronizing the CPU with
* the GPU is far from ideal, we hope that this is only a short
* term solution.
* - One idea is to using sync objects to track render
* completion so we can throttle the backlog (ideally with an
* additional extension that lets us get notifications in our
* mainloop instead of having to busy wait for the
* completion.)
* - Another option is to support clipped redraws by reusing the
* contents of old back buffers such that we can flip instead
* of using a blit and then we can use GLX_INTEL_swap_events
* to throttle. For this though we would still probably want an
* additional extension so we can report the limited region of
* the window damage to X/compositors.
*/
glFinish ();
if (have_counter && can_wait)
{
end_frame_vsync_counter = _cogl_winsys_get_vsync_counter ();
/* If we have the GLX_SGI_video_sync extension then we can
* be a bit smarter about how we throttle blits by avoiding
* any waits if we can see that the video sync count has
* already progressed. */
if (glx_onscreen->last_swap_vsync_counter == end_frame_vsync_counter)
_cogl_winsys_wait_for_vblank ();
}
else if (can_wait)
_cogl_winsys_wait_for_vblank ();
if (glx_renderer->pf_glXCopySubBuffer)
{
Display *xdpy = xlib_renderer->xdpy;
int i;
for (i = 0; i < n_rectangles; i++)
{
int *rect = &rectangles[4 * i];
glx_renderer->pf_glXCopySubBuffer (xdpy, drawable,
rect[0], rect[1], rect[2], rect[3]);
}
}
else if (context->drv.pf_glBlitFramebuffer)
{
int i;
/* XXX: checkout how this state interacts with the code to use
* glBlitFramebuffer in Neil's texture atlasing branch */
glDrawBuffer (GL_FRONT);
for (i = 0; i < n_rectangles; i++)
{
int *rect = &rectangles[4 * i];
int x2 = rect[0] + rect[2];
int y2 = rect[1] + rect[3];
context->drv.pf_glBlitFramebuffer (rect[0], rect[1], x2, y2,
rect[0], rect[1], x2, y2,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
}
glDrawBuffer (GL_BACK);
}
/* NB: unlike glXSwapBuffers, glXCopySubBuffer and
* glBlitFramebuffer don't issue an implicit glFlush() so we
* have to flush ourselves if we want the request to complete in
* a finite amount of time since otherwise the driver can batch
* the command indefinitely. */
glFlush ();
/* NB: It's important we save the counter we read before acting on
* the swap request since if we are mixing and matching different
* swap methods between frames we don't want to read the timer e.g.
* after calling glFinish() some times and not for others.
*
* In other words; this way we consistently save the time at the end
* of the applications frame such that the counter isn't muddled by
* the varying costs of different swap methods.
*/
if (have_counter)
glx_onscreen->last_swap_vsync_counter = end_frame_vsync_counter;
}
guint32
_cogl_winsys_get_vsync_counter (void)
{
guint32 video_sync_count;
CoglRendererGLX *glx_renderer;
_COGL_GET_CONTEXT (ctx, 0);
glx_renderer = ctx->display->renderer->winsys;
glx_renderer->pf_glXGetVideoSync (&video_sync_count);
return video_sync_count;
}
void
_cogl_winsys_onscreen_swap_buffers (CoglOnscreen *onscreen)
{
CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
CoglContext *context = framebuffer->context;
CoglRendererXlib *xlib_renderer = context->display->renderer->winsys;
CoglRendererGLX *glx_renderer = context->display->renderer->winsys;
CoglOnscreenXlib *xlib_onscreen = onscreen->winsys;
CoglOnscreenGLX *glx_onscreen = onscreen->winsys;
gboolean have_counter;
GLXDrawable drawable;
/* XXX: theoretically this shouldn't be necessary but at least with
* the Intel drivers we have see that if we don't call
* glXMakeContextCurrent for the drawable we are swapping then
* we get a BadDrawable error from the X server. */
_cogl_framebuffer_flush_state (framebuffer,
framebuffer,
COGL_FRAMEBUFFER_FLUSH_BIND_ONLY);
drawable = glx_onscreen->glxwin ? glx_onscreen->glxwin : xlib_onscreen->xwin;
if (onscreen->swap_throttled)
{
guint32 end_frame_vsync_counter;
have_counter =
_cogl_winsys_has_feature (COGL_WINSYS_FEATURE_VBLANK_COUNTER);
/* If the swap_region API is also being used then we need to track
* the vsync counter for each swap request so we can manually
* throttle swap_region requests. */
if (have_counter)
end_frame_vsync_counter = _cogl_winsys_get_vsync_counter ();
if (!glx_renderer->pf_glXSwapInterval)
{
gboolean can_wait =
_cogl_winsys_has_feature (COGL_WINSYS_FEATURE_VBLANK_WAIT);
/* If we are going to wait for VBLANK manually, we not only
* need to flush out pending drawing to the GPU before we
* sleep, we need to wait for it to finish. Otherwise, we
* may end up with the situation:
*
* - We finish drawing - GPU drawing continues
* - We go to sleep - GPU drawing continues
* VBLANK - We call glXSwapBuffers - GPU drawing continues
* - GPU drawing continues
* - Swap buffers happens
*
* Producing a tear. Calling glFinish() first will cause us
* to properly wait for the next VBLANK before we swap. This
* obviously does not happen when we use _GLX_SWAP and let
* the driver do the right thing
*/
glFinish ();
if (have_counter && can_wait)
{
if (glx_onscreen->last_swap_vsync_counter ==
end_frame_vsync_counter)
_cogl_winsys_wait_for_vblank ();
}
else if (can_wait)
_cogl_winsys_wait_for_vblank ();
}
}
else
have_counter = FALSE;
glXSwapBuffers (xlib_renderer->xdpy, drawable);
if (have_counter)
glx_onscreen->last_swap_vsync_counter = _cogl_winsys_get_vsync_counter ();
}
guint32
_cogl_winsys_onscreen_x11_get_window_xid (CoglOnscreen *onscreen)
{
CoglOnscreenXlib *xlib_onscreen = onscreen->winsys;
return xlib_onscreen->xwin;
}
unsigned int
_cogl_winsys_onscreen_add_swap_buffers_callback (CoglOnscreen *onscreen,
CoglSwapBuffersNotify callback,
void *user_data)
{
CoglOnscreenGLX *glx_onscreen = onscreen->winsys;
CoglSwapBuffersNotifyEntry *entry = g_slice_new0 (CoglSwapBuffersNotifyEntry);
static int next_swap_buffers_callback_id = 0;
entry->callback = callback;
entry->user_data = user_data;
entry->id = next_swap_buffers_callback_id++;
glx_onscreen->swap_callbacks =
g_list_prepend (glx_onscreen->swap_callbacks, entry);
return entry->id;
}
void
_cogl_winsys_onscreen_remove_swap_buffers_callback (CoglOnscreen *onscreen,
unsigned int id)
{
CoglOnscreenGLX *glx_onscreen = onscreen->winsys;
GList *l;
for (l = glx_onscreen->swap_callbacks; l; l = l->next)
{
CoglSwapBuffersNotifyEntry *entry = l->data;
if (entry->id == id)
{
g_slice_free (CoglSwapBuffersNotifyEntry, entry);
glx_onscreen->swap_callbacks =
g_list_delete_link (glx_onscreen->swap_callbacks, l);
return;
}
}
}
void
_cogl_winsys_onscreen_update_swap_throttled (CoglOnscreen *onscreen)
{
CoglContext *context = COGL_FRAMEBUFFER (onscreen)->context;
CoglContextGLX *glx_context = context->winsys;
CoglOnscreenGLX *glx_onscreen = onscreen->winsys;
CoglOnscreenXlib *xlib_onscreen = onscreen->winsys;
GLXDrawable drawable =
glx_onscreen->glxwin ? glx_onscreen->glxwin : xlib_onscreen->xwin;
if (glx_context->current_drawable != drawable)
return;
glx_context->current_drawable = 0;
_cogl_winsys_onscreen_bind (onscreen);
}
/* FIXME: we should distinguish renderer and context features */
gboolean
_cogl_winsys_has_feature (CoglWinsysFeature feature)
{
_COGL_GET_CONTEXT (ctx, FALSE);
return _cogl_bitmask_get (&ctx->winsys_features, feature);
}
/* XXX: This is a particularly hacky _cogl_winsys interface... */
XVisualInfo *
_cogl_winsys_xlib_get_visual_info (void)
{
CoglDisplayXlib *xlib_display;
CoglDisplayGLX *glx_display;
CoglRendererXlib *xlib_renderer;
_COGL_GET_CONTEXT (ctx, NULL);
g_return_val_if_fail (ctx->display->winsys, FALSE);
xlib_display = ctx->display->winsys;
glx_display = ctx->display->winsys;
xlib_renderer = ctx->display->renderer->winsys;
if (!glx_display->found_fbconfig)
return NULL;
return glXGetVisualFromFBConfig (xlib_renderer->xdpy, glx_display->fbconfig);
}
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