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gtk2/gdk/x11/gdkglcontext-x11.c
Ignacio Casal Quinteiro 186c8f5254 gdk: fix crash if visual is NULL 
cairo_xlib_surface_get_visual might return NULL so we need to
check for NULL before trying to use it.

https://bugzilla.gnome.org/show_bug.cgi?id=752520
2015-07-17 14:26:11 +02:00

1300 lines
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/* GDK - The GIMP Drawing Kit
*
* gdkglcontext-x11.c: X11 specific OpenGL wrappers
*
* Copyright © 2014 Emmanuele Bassi
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gdkglcontext-x11.h"
#include "gdkdisplay-x11.h"
#include "gdkscreen-x11.h"
#include "gdkx11display.h"
#include "gdkx11glcontext.h"
#include "gdkx11screen.h"
#include "gdkx11window.h"
#include "gdkx11visual.h"
#include "gdkvisualprivate.h"
#include "gdkx11property.h"
#include <X11/Xatom.h>
#include "gdkinternals.h"
#include "gdkintl.h"
#include <cairo/cairo-xlib.h>
#include <epoxy/glx.h>
G_DEFINE_TYPE (GdkX11GLContext, gdk_x11_gl_context, GDK_TYPE_GL_CONTEXT)
typedef struct {
GdkDisplay *display;
GLXDrawable glx_drawable;
Window dummy_xwin;
GLXWindow dummy_glx;
guint32 last_frame_counter;
} DrawableInfo;
static void
drawable_info_free (gpointer data_)
{
DrawableInfo *data = data_;
Display *dpy;
gdk_x11_display_error_trap_push (data->display);
dpy = gdk_x11_display_get_xdisplay (data->display);
if (data->glx_drawable)
glXDestroyWindow (dpy, data->glx_drawable);
if (data->dummy_glx)
glXDestroyWindow (dpy, data->dummy_glx);
if (data->dummy_xwin)
XDestroyWindow (dpy, data->dummy_xwin);
gdk_x11_display_error_trap_pop_ignored (data->display);
g_slice_free (DrawableInfo, data);
}
static DrawableInfo *
get_glx_drawable_info (GdkWindow *window)
{
return g_object_get_data (G_OBJECT (window), "-gdk-x11-window-glx-info");
}
static void
set_glx_drawable_info (GdkWindow *window,
DrawableInfo *info)
{
g_object_set_data_full (G_OBJECT (window), "-gdk-x11-window-glx-info",
info,
drawable_info_free);
}
static void
maybe_wait_for_vblank (GdkDisplay *display,
GLXDrawable drawable)
{
GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
Display *dpy = gdk_x11_display_get_xdisplay (display);
if (display_x11->has_glx_sync_control)
{
gint64 ust, msc, sbc;
glXGetSyncValuesOML (dpy, drawable, &ust, &msc, &sbc);
glXWaitForMscOML (dpy, drawable,
0, 2, (msc + 1) % 2,
&ust, &msc, &sbc);
}
else if (display_x11->has_glx_video_sync)
{
guint32 current_count;
glXGetVideoSyncSGI (&current_count);
glXWaitVideoSyncSGI (2, (current_count + 1) % 2, &current_count);
}
}
void
gdk_x11_window_invalidate_for_new_frame (GdkWindow *window,
cairo_region_t *update_area)
{
cairo_rectangle_int_t window_rect;
GdkDisplay *display = gdk_window_get_display (window);
GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
Display *dpy = gdk_x11_display_get_xdisplay (display);
GdkX11GLContext *context_x11;
unsigned int buffer_age;
gboolean invalidate_all;
/* Minimal update is ok if we're not drawing with gl */
if (window->gl_paint_context == NULL)
return;
context_x11 = GDK_X11_GL_CONTEXT (window->gl_paint_context);
buffer_age = 0;
context_x11->do_blit_swap = FALSE;
if (display_x11->has_glx_buffer_age)
{
gdk_gl_context_make_current (window->gl_paint_context);
glXQueryDrawable(dpy, context_x11->drawable,
GLX_BACK_BUFFER_AGE_EXT, &buffer_age);
}
invalidate_all = FALSE;
if (buffer_age == 0 || buffer_age >= 4)
{
cairo_rectangle_int_t whole_window = { 0, 0, gdk_window_get_width (window), gdk_window_get_height (window) };
if (gdk_gl_context_has_framebuffer_blit (window->gl_paint_context) &&
cairo_region_contains_rectangle (update_area, &whole_window) != CAIRO_REGION_OVERLAP_IN)
{
context_x11->do_blit_swap = TRUE;
}
else
invalidate_all = TRUE;
}
else
{
if (buffer_age >= 2)
{
if (window->old_updated_area[0])
cairo_region_union (update_area, window->old_updated_area[0]);
else
invalidate_all = TRUE;
}
if (buffer_age >= 3)
{
if (window->old_updated_area[1])
cairo_region_union (update_area, window->old_updated_area[1]);
else
invalidate_all = TRUE;
}
}
if (invalidate_all)
{
window_rect.x = 0;
window_rect.y = 0;
window_rect.width = gdk_window_get_width (window);
window_rect.height = gdk_window_get_height (window);
/* If nothing else is known, repaint everything so that the back
buffer is fully up-to-date for the swapbuffer */
cairo_region_union_rectangle (update_area, &window_rect);
}
}
static void
gdk_gl_blit_region (GdkWindow *window, cairo_region_t *region)
{
int n_rects, i;
int scale = gdk_window_get_scale_factor (window);
int wh = gdk_window_get_height (window);
cairo_rectangle_int_t rect;
n_rects = cairo_region_num_rectangles (region);
for (i = 0; i < n_rects; i++)
{
cairo_region_get_rectangle (region, i, &rect);
glScissor (rect.x * scale, (wh - rect.y - rect.height) * scale, rect.width * scale, rect.height * scale);
glBlitFramebuffer (rect.x * scale, (wh - rect.y - rect.height) * scale, (rect.x + rect.width) * scale, (wh - rect.y) * scale,
rect.x * scale, (wh - rect.y - rect.height) * scale, (rect.x + rect.width) * scale, (wh - rect.y) * scale,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
}
}
static void
gdk_x11_gl_context_end_frame (GdkGLContext *context,
cairo_region_t *painted,
cairo_region_t *damage)
{
GdkX11GLContext *context_x11 = GDK_X11_GL_CONTEXT (context);
GdkWindow *window = gdk_gl_context_get_window (context);
GdkDisplay *display = gdk_gl_context_get_display (context);
Display *dpy = gdk_x11_display_get_xdisplay (display);
GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
DrawableInfo *info;
GLXDrawable drawable;
gdk_gl_context_make_current (context);
info = get_glx_drawable_info (window);
drawable = context_x11->drawable;
GDK_NOTE (OPENGL,
g_print ("Flushing GLX buffers for drawable %lu (window: %lu), frame sync: %s\n",
(unsigned long) drawable,
(unsigned long) gdk_x11_window_get_xid (window),
context_x11->do_frame_sync ? "yes" : "no"));
/* if we are going to wait for the vertical refresh manually
* we need to flush pending redraws, and we also need to wait
* for that to finish, otherwise we are going to tear.
*
* obviously, this condition should not be hit if we have
* GLX_SGI_swap_control, and we ask the driver to do the right
* thing.
*/
if (context_x11->do_frame_sync)
{
guint32 end_frame_counter = 0;
gboolean has_counter = display_x11->has_glx_video_sync;
gboolean can_wait = display_x11->has_glx_video_sync || display_x11->has_glx_sync_control;
if (display_x11->has_glx_video_sync)
glXGetVideoSyncSGI (&end_frame_counter);
if (context_x11->do_frame_sync && !display_x11->has_glx_swap_interval)
{
glFinish ();
if (has_counter && can_wait)
{
guint32 last_counter = info != NULL ? info->last_frame_counter : 0;
if (last_counter == end_frame_counter)
maybe_wait_for_vblank (display, drawable);
}
else if (can_wait)
maybe_wait_for_vblank (display, drawable);
}
}
if (context_x11->do_blit_swap)
{
glDrawBuffer(GL_FRONT);
glReadBuffer(GL_BACK);
gdk_gl_blit_region (window, painted);
glDrawBuffer(GL_BACK);
glFlush();
if (gdk_gl_context_has_frame_terminator (context))
glFrameTerminatorGREMEDY ();
}
else
glXSwapBuffers (dpy, drawable);
if (context_x11->do_frame_sync && info != NULL && display_x11->has_glx_video_sync)
glXGetVideoSyncSGI (&info->last_frame_counter);
}
typedef struct {
Display *display;
GLXDrawable drawable;
gboolean y_inverted;
} GdkGLXPixmap;
static void
glx_pixmap_destroy (void *data)
{
GdkGLXPixmap *glx_pixmap = data;
glXDestroyPixmap (glx_pixmap->display, glx_pixmap->drawable);
g_slice_free (GdkGLXPixmap, glx_pixmap);
}
static GdkGLXPixmap *
glx_pixmap_get (cairo_surface_t *surface, guint texture_target)
{
Display *display = cairo_xlib_surface_get_display (surface);
Screen *screen = cairo_xlib_surface_get_screen (surface);
Visual *visual = cairo_xlib_surface_get_visual (surface);
GdkGLXPixmap *glx_pixmap;
GLXFBConfig *fbconfigs, config;
int nfbconfigs;
XVisualInfo *visinfo;
VisualID visualid;
int i, value;
gboolean y_inverted;
gboolean with_alpha;
guint target = 0;
guint format = 0;
int pixmap_attributes[] = {
GLX_TEXTURE_TARGET_EXT, 0,
GLX_TEXTURE_FORMAT_EXT, 0,
None
};
if (visual == NULL)
return NULL;
with_alpha = cairo_surface_get_content (surface) == CAIRO_CONTENT_COLOR_ALPHA;
y_inverted = FALSE;
fbconfigs = glXGetFBConfigs (display, XScreenNumberOfScreen (screen), &nfbconfigs);
for (i = 0; i < nfbconfigs; i++)
{
visinfo = glXGetVisualFromFBConfig (display, fbconfigs[i]);
if (!visinfo)
continue;
visualid = visinfo->visualid;
XFree (visinfo);
if (visualid != XVisualIDFromVisual (visual))
continue;
glXGetFBConfigAttrib (display, fbconfigs[i], GLX_DRAWABLE_TYPE, &value);
if (!(value & GLX_PIXMAP_BIT))
continue;
glXGetFBConfigAttrib (display, fbconfigs[i],
GLX_BIND_TO_TEXTURE_TARGETS_EXT,
&value);
if (texture_target == GL_TEXTURE_2D)
{
if (value & GLX_TEXTURE_2D_BIT_EXT)
target = GLX_TEXTURE_2D_EXT;
else
continue;
}
else if (texture_target == GL_TEXTURE_RECTANGLE_ARB)
{
if (value & GLX_TEXTURE_RECTANGLE_BIT_EXT)
target = GLX_TEXTURE_RECTANGLE_EXT;
else
continue;
}
else
continue;
if (!with_alpha)
{
glXGetFBConfigAttrib (display, fbconfigs[i],
GLX_BIND_TO_TEXTURE_RGB_EXT,
&value);
if (!value)
continue;
format = GLX_TEXTURE_FORMAT_RGB_EXT;
}
else
{
glXGetFBConfigAttrib (display, fbconfigs[i],
GLX_BIND_TO_TEXTURE_RGBA_EXT,
&value);
if (!value)
continue;
format = GLX_TEXTURE_FORMAT_RGBA_EXT;
}
glXGetFBConfigAttrib (display, fbconfigs[i],
GLX_Y_INVERTED_EXT,
&value);
if (value == TRUE)
y_inverted = TRUE;
config = fbconfigs[i];
break;
}
XFree (fbconfigs);
if (i == nfbconfigs)
return NULL;
pixmap_attributes[1] = target;
pixmap_attributes[3] = format;
glx_pixmap = g_slice_new0 (GdkGLXPixmap);
glx_pixmap->y_inverted = y_inverted;
glx_pixmap->display = display;
glx_pixmap->drawable = glXCreatePixmap (display, config,
cairo_xlib_surface_get_drawable (surface),
pixmap_attributes);
return glx_pixmap;
}
static gboolean
gdk_x11_gl_context_texture_from_surface (GdkGLContext *paint_context,
cairo_surface_t *surface,
cairo_region_t *region)
{
GdkGLXPixmap *glx_pixmap;
double device_x_offset, device_y_offset;
cairo_rectangle_int_t rect;
int n_rects, i;
GdkWindow *window;
int unscaled_window_height;
int window_scale;
unsigned int texture_id;
gboolean use_texture_rectangle;
guint target;
double sx, sy;
float uscale, vscale;
GdkTexturedQuad *quads;
GdkX11Display *display_x11;
display_x11 = GDK_X11_DISPLAY (gdk_gl_context_get_display (paint_context));
if (!display_x11->has_glx_texture_from_pixmap)
return FALSE;
if (cairo_surface_get_type (surface) != CAIRO_SURFACE_TYPE_XLIB)
return FALSE;
use_texture_rectangle = gdk_gl_context_use_texture_rectangle (paint_context);
if (use_texture_rectangle)
target = GL_TEXTURE_RECTANGLE_ARB;
else
target = GL_TEXTURE_2D;
glx_pixmap = glx_pixmap_get (surface, target);
if (glx_pixmap == NULL)
return FALSE;
window = gdk_gl_context_get_window (paint_context)->impl_window;
window_scale = gdk_window_get_scale_factor (window);
gdk_window_get_unscaled_size (window, NULL, &unscaled_window_height);
sx = sy = 1;
cairo_surface_get_device_scale (window->current_paint.surface, &sx, &sy);
cairo_surface_get_device_offset (surface,
&device_x_offset, &device_y_offset);
/* Ensure all the X stuff are synced before we read it back via texture-from-pixmap */
glXWaitX();
glGenTextures (1, &texture_id);
glBindTexture (target, texture_id);
glTexParameteri (target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri (target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri (target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri (target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glXBindTexImageEXT (glx_pixmap->display, glx_pixmap->drawable,
GLX_FRONT_LEFT_EXT, NULL);
glEnable (GL_SCISSOR_TEST);
n_rects = cairo_region_num_rectangles (region);
quads = g_new (GdkTexturedQuad, n_rects);
#define FLIP_Y(_y) (unscaled_window_height - (_y))
cairo_region_get_extents (region, &rect);
glScissor (rect.x * window_scale, FLIP_Y((rect.y + rect.height) * window_scale),
rect.width * window_scale, rect.height * window_scale);
for (i = 0; i < n_rects; i++)
{
int src_x, src_y, src_height, src_width;
cairo_region_get_rectangle (region, i, &rect);
src_x = rect.x * sx + device_x_offset;
src_y = rect.y * sy + device_y_offset;
src_width = rect.width * sx;
src_height = rect.height * sy;
if (use_texture_rectangle)
{
uscale = 1.0;
vscale = 1.0;
}
else
{
uscale = 1.0 / cairo_xlib_surface_get_width (surface);
vscale = 1.0 / cairo_xlib_surface_get_height (surface);
}
{
GdkTexturedQuad quad = {
rect.x * window_scale, FLIP_Y(rect.y * window_scale),
(rect.x + rect.width) * window_scale, FLIP_Y((rect.y + rect.height) * window_scale),
uscale * src_x, vscale * src_y,
uscale * (src_x + src_width), vscale * (src_y + src_height),
};
quads[i] = quad;
}
}
#undef FLIP_Y
gdk_gl_texture_quads (paint_context, target, n_rects, quads);
g_free (quads);
glDisable (GL_SCISSOR_TEST);
glXReleaseTexImageEXT (glx_pixmap->display, glx_pixmap->drawable,
GLX_FRONT_LEFT_EXT);
glDeleteTextures (1, &texture_id);
glx_pixmap_destroy(glx_pixmap);
return TRUE;
}
static XVisualInfo *
find_xvisinfo_for_fbconfig (GdkDisplay *display,
GLXFBConfig config)
{
Display *dpy = gdk_x11_display_get_xdisplay (display);
return glXGetVisualFromFBConfig (dpy, config);
}
static GLXContext
create_gl3_context (GdkDisplay *display,
GLXFBConfig config,
GdkGLContext *share,
int flags,
int major,
int minor)
{
int attrib_list[] = {
GLX_CONTEXT_PROFILE_MASK_ARB, GLX_CONTEXT_CORE_PROFILE_BIT_ARB,
GLX_CONTEXT_MAJOR_VERSION_ARB, major,
GLX_CONTEXT_MINOR_VERSION_ARB, minor,
GLX_CONTEXT_FLAGS_ARB, flags,
None,
};
GLXContext res;
GdkX11GLContext *share_x11 = NULL;
if (share != NULL)
share_x11 = GDK_X11_GL_CONTEXT (share);
gdk_x11_display_error_trap_push (display);
res = glXCreateContextAttribsARB (gdk_x11_display_get_xdisplay (display),
config,
share_x11 != NULL ? share_x11->glx_context : NULL,
True,
attrib_list);
if (gdk_x11_display_error_trap_pop (display))
return NULL;
return res;
}
static gboolean
gdk_x11_gl_context_realize (GdkGLContext *context,
GError **error)
{
GdkDisplay *display;
GdkX11GLContext *context_x11;
GLXWindow drawable;
XVisualInfo *xvisinfo;
Display *dpy;
DrawableInfo *info;
GdkGLContext *share;
GdkWindow *window;
gboolean debug_bit, compat_bit;
int major, minor, flags;
window = gdk_gl_context_get_window (context);
display = gdk_window_get_display (window);
dpy = gdk_x11_display_get_xdisplay (display);
context_x11 = GDK_X11_GL_CONTEXT (context);
share = gdk_gl_context_get_shared_context (context);
gdk_gl_context_get_required_version (context, &major, &minor);
debug_bit = gdk_gl_context_get_debug_enabled (context);
compat_bit = gdk_gl_context_get_forward_compatible (context);
flags = 0;
if (debug_bit)
flags |= GLX_CONTEXT_DEBUG_BIT_ARB;
if (compat_bit)
flags |= GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
GDK_NOTE (OPENGL,
g_print ("Creating core GLX context (version:%d.%d, debug:%s, forward:%s)\n",
major, minor,
debug_bit ? "yes" : "no",
compat_bit ? "yes" : "no"));
context_x11->glx_context = create_gl3_context (display,
context_x11->glx_config,
share,
flags, major, minor);
if (context_x11->glx_context == NULL)
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_NOT_AVAILABLE,
_("Unable to create a GL context"));
return FALSE;
}
xvisinfo = find_xvisinfo_for_fbconfig (display, context_x11->glx_config);
info = get_glx_drawable_info (window->impl_window);
if (info == NULL)
{
XSetWindowAttributes attrs;
unsigned long mask;
gdk_x11_display_error_trap_push (display);
info = g_slice_new0 (DrawableInfo);
info->display = display;
info->last_frame_counter = 0;
attrs.override_redirect = True;
attrs.colormap = XCreateColormap (dpy, DefaultRootWindow (dpy), xvisinfo->visual, AllocNone);
attrs.border_pixel = 0;
mask = CWOverrideRedirect | CWColormap | CWBorderPixel;
info->dummy_xwin = XCreateWindow (dpy, DefaultRootWindow (dpy),
-100, -100, 1, 1,
0,
xvisinfo->depth,
CopyFromParent,
xvisinfo->visual,
mask,
&attrs);
XMapWindow(dpy, info->dummy_xwin);
if (GDK_X11_DISPLAY (display)->glx_version >= 13)
{
info->glx_drawable = glXCreateWindow (dpy, context_x11->glx_config,
gdk_x11_window_get_xid (window->impl_window),
NULL);
info->dummy_glx = glXCreateWindow (dpy, context_x11->glx_config, info->dummy_xwin, NULL);
}
if (gdk_x11_display_error_trap_pop (display))
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_NOT_AVAILABLE,
_("Unable to create a GL context"));
XFree (xvisinfo);
drawable_info_free (info);
glXDestroyContext (dpy, context_x11->glx_context);
context_x11->glx_context = NULL;
return FALSE;
}
set_glx_drawable_info (window->impl_window, info);
}
XFree (xvisinfo);
if (context_x11->is_attached)
drawable = info->glx_drawable ? info->glx_drawable : gdk_x11_window_get_xid (window->impl_window);
else
drawable = info->dummy_glx ? info->dummy_glx : info->dummy_xwin;
context_x11->is_direct = glXIsDirect (dpy, context_x11->glx_context);
context_x11->drawable = drawable;
GDK_NOTE (OPENGL,
g_print ("Realized GLX context[%p], %s\n",
context_x11->glx_context,
context_x11->is_direct ? "direct" : "indirect"));
return TRUE;
}
static void
gdk_x11_gl_context_dispose (GObject *gobject)
{
GdkX11GLContext *context_x11 = GDK_X11_GL_CONTEXT (gobject);
if (context_x11->glx_context != NULL)
{
GdkGLContext *context = GDK_GL_CONTEXT (gobject);
GdkDisplay *display = gdk_gl_context_get_display (context);
Display *dpy = gdk_x11_display_get_xdisplay (display);
if (glXGetCurrentContext () == context_x11->glx_context)
glXMakeContextCurrent (dpy, None, None, NULL);
GDK_NOTE (OPENGL, g_print ("Destroying GLX context\n"));
glXDestroyContext (dpy, context_x11->glx_context);
context_x11->glx_context = NULL;
}
G_OBJECT_CLASS (gdk_x11_gl_context_parent_class)->dispose (gobject);
}
static void
gdk_x11_gl_context_class_init (GdkX11GLContextClass *klass)
{
GdkGLContextClass *context_class = GDK_GL_CONTEXT_CLASS (klass);
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
context_class->realize = gdk_x11_gl_context_realize;
context_class->end_frame = gdk_x11_gl_context_end_frame;
context_class->texture_from_surface = gdk_x11_gl_context_texture_from_surface;
gobject_class->dispose = gdk_x11_gl_context_dispose;
}
static void
gdk_x11_gl_context_init (GdkX11GLContext *self)
{
self->do_frame_sync = TRUE;
}
gboolean
gdk_x11_screen_init_gl (GdkScreen *screen)
{
GdkDisplay *display = gdk_screen_get_display (screen);
GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
Display *dpy;
int error_base, event_base;
int screen_num;
if (display_x11->have_glx)
return TRUE;
if (_gdk_gl_flags & GDK_GL_DISABLE)
return FALSE;
dpy = gdk_x11_display_get_xdisplay (display);
if (!glXQueryExtension (dpy, &error_base, &event_base))
return FALSE;
screen_num = GDK_X11_SCREEN (screen)->screen_num;
display_x11->have_glx = TRUE;
display_x11->glx_version = epoxy_glx_version (dpy, screen_num);
display_x11->glx_error_base = error_base;
display_x11->glx_event_base = event_base;
display_x11->has_glx_create_context =
epoxy_has_glx_extension (dpy, screen_num, "GLX_ARB_create_context_profile");
display_x11->has_glx_swap_interval =
epoxy_has_glx_extension (dpy, screen_num, "GLX_SGI_swap_control");
display_x11->has_glx_texture_from_pixmap =
epoxy_has_glx_extension (dpy, screen_num, "GLX_EXT_texture_from_pixmap");
display_x11->has_glx_video_sync =
epoxy_has_glx_extension (dpy, screen_num, "GLX_SGI_video_sync");
display_x11->has_glx_buffer_age =
epoxy_has_glx_extension (dpy, screen_num, "GLX_EXT_buffer_age");
display_x11->has_glx_sync_control =
epoxy_has_glx_extension (dpy, screen_num, "GLX_OML_sync_control");
display_x11->has_glx_multisample =
epoxy_has_glx_extension (dpy, screen_num, "GLX_ARB_multisample");
display_x11->has_glx_visual_rating =
epoxy_has_glx_extension (dpy, screen_num, "GLX_EXT_visual_rating");
GDK_NOTE (OPENGL,
g_print ("GLX version %d.%d found\n"
" - Vendor: %s\n"
" - Checked extensions:\n"
"\t* GLX_ARB_create_context_profile: %s\n"
"\t* GLX_SGI_swap_control: %s\n"
"\t* GLX_EXT_texture_from_pixmap: %s\n"
"\t* GLX_SGI_video_sync: %s\n"
"\t* GLX_EXT_buffer_age: %s\n"
"\t* GLX_OML_sync_control: %s\n",
display_x11->glx_version / 10,
display_x11->glx_version % 10,
glXGetClientString (dpy, GLX_VENDOR),
display_x11->has_glx_create_context ? "yes" : "no",
display_x11->has_glx_swap_interval ? "yes" : "no",
display_x11->has_glx_texture_from_pixmap ? "yes" : "no",
display_x11->has_glx_video_sync ? "yes" : "no",
display_x11->has_glx_buffer_age ? "yes" : "no",
display_x11->has_glx_sync_control ? "yes" : "no"));
return TRUE;
}
#define MAX_GLX_ATTRS 30
static gboolean
find_fbconfig_for_visual (GdkDisplay *display,
GdkVisual *visual,
GLXFBConfig *fb_config_out,
GError **error)
{
static int attrs[MAX_GLX_ATTRS];
Display *dpy = gdk_x11_display_get_xdisplay (display);
GLXFBConfig *configs;
int n_configs, i;
gboolean use_rgba;
gboolean retval = FALSE;
VisualID xvisual_id = XVisualIDFromVisual(gdk_x11_visual_get_xvisual (visual));
i = 0;
attrs[i++] = GLX_DRAWABLE_TYPE;
attrs[i++] = GLX_WINDOW_BIT;
attrs[i++] = GLX_RENDER_TYPE;
attrs[i++] = GLX_RGBA_BIT;
attrs[i++] = GLX_DOUBLEBUFFER;
attrs[i++] = GL_TRUE;
attrs[i++] = GLX_RED_SIZE;
attrs[i++] = 1;
attrs[i++] = GLX_GREEN_SIZE;
attrs[i++] = 1;
attrs[i++] = GLX_BLUE_SIZE;
attrs[i++] = 1;
use_rgba = (visual == gdk_screen_get_rgba_visual (gdk_display_get_default_screen (display)));
if (use_rgba)
{
attrs[i++] = GLX_ALPHA_SIZE;
attrs[i++] = 1;
}
else
{
attrs[i++] = GLX_ALPHA_SIZE;
attrs[i++] = GLX_DONT_CARE;
}
attrs[i++] = None;
g_assert (i < MAX_GLX_ATTRS);
configs = glXChooseFBConfig (dpy, DefaultScreen (dpy), attrs, &n_configs);
if (configs == NULL || n_configs == 0)
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_UNSUPPORTED_FORMAT,
_("No available configurations for the given pixel format"));
return FALSE;
}
for (i = 0; i < n_configs; i++)
{
XVisualInfo *visinfo;
visinfo = glXGetVisualFromFBConfig (dpy, configs[i]);
if (visinfo == NULL)
continue;
if (visinfo->visualid != xvisual_id)
{
XFree (visinfo);
continue;
}
if (fb_config_out != NULL)
*fb_config_out = configs[i];
XFree (visinfo);
retval = TRUE;
goto out;
}
g_set_error (error, GDK_GL_ERROR,
GDK_GL_ERROR_UNSUPPORTED_FORMAT,
_("No available configurations for the given RGBA pixel format"));
out:
XFree (configs);
return retval;
}
struct glvisualinfo {
int supports_gl;
int double_buffer;
int stereo;
int alpha_size;
int depth_size;
int stencil_size;
int num_multisample;
int visual_caveat;
};
static gboolean
visual_compatible (const GdkVisual *a, const GdkVisual *b)
{
return a->type == b->type &&
a->depth == b->depth &&
a->red_mask == b->red_mask &&
a->green_mask == b->green_mask &&
a->blue_mask == b->blue_mask &&
a->colormap_size == b->colormap_size &&
a->bits_per_rgb == b->bits_per_rgb;
}
static gboolean
visual_is_rgba (const GdkVisual *visual)
{
return
visual->depth == 32 &&
visual->red_mask == 0xff0000 &&
visual->green_mask == 0x00ff00 &&
visual->blue_mask == 0x0000ff;
}
/* This picks a compatible (as in has the same X visual details) visual
that has "better" characteristics on the GL side */
static GdkVisual *
pick_better_visual_for_gl (GdkX11Screen *x11_screen,
struct glvisualinfo *gl_info,
GdkVisual *compatible)
{
GdkVisual *visual;
int i;
gboolean want_alpha = visual_is_rgba (compatible);
/* First look for "perfect match", i.e:
* supports gl
* double buffer
* alpha iff visual is an rgba visual
* no unnecessary stuff
*/
for (i = 0; i < x11_screen->nvisuals; i++)
{
visual = x11_screen->visuals[i];
if (visual_compatible (visual, compatible) &&
gl_info[i].supports_gl &&
gl_info[i].double_buffer &&
!gl_info[i].stereo &&
(want_alpha ? (gl_info[i].alpha_size > 0) : (gl_info[i].alpha_size == 0)) &&
(gl_info[i].depth_size == 0) &&
(gl_info[i].stencil_size == 0) &&
(gl_info[i].num_multisample == 0) &&
(gl_info[i].visual_caveat == GLX_NONE_EXT))
return visual;
}
if (!want_alpha)
{
/* Next, allow alpha even if we don't want it: */
for (i = 0; i < x11_screen->nvisuals; i++)
{
visual = x11_screen->visuals[i];
if (visual_compatible (visual, compatible) &&
gl_info[i].supports_gl &&
gl_info[i].double_buffer &&
!gl_info[i].stereo &&
(gl_info[i].depth_size == 0) &&
(gl_info[i].stencil_size == 0) &&
(gl_info[i].num_multisample == 0) &&
(gl_info[i].visual_caveat == GLX_NONE_EXT))
return visual;
}
}
/* Next, allow depth and stencil buffers: */
for (i = 0; i < x11_screen->nvisuals; i++)
{
visual = x11_screen->visuals[i];
if (visual_compatible (visual, compatible) &&
gl_info[i].supports_gl &&
gl_info[i].double_buffer &&
!gl_info[i].stereo &&
(gl_info[i].num_multisample == 0) &&
(gl_info[i].visual_caveat == GLX_NONE_EXT))
return visual;
}
/* Next, allow multisample: */
for (i = 0; i < x11_screen->nvisuals; i++)
{
visual = x11_screen->visuals[i];
if (visual_compatible (visual, compatible) &&
gl_info[i].supports_gl &&
gl_info[i].double_buffer &&
!gl_info[i].stereo &&
(gl_info[i].visual_caveat == GLX_NONE_EXT))
return visual;
}
return compatible;
}
static gboolean
get_cached_gl_visuals (GdkDisplay *display, int *system, int *rgba)
{
gboolean found;
Atom type_return;
gint format_return;
gulong nitems_return;
gulong bytes_after_return;
guchar *data = NULL;
Display *dpy;
dpy = gdk_x11_display_get_xdisplay (display);
found = FALSE;
gdk_x11_display_error_trap_push (display);
if (XGetWindowProperty (dpy, DefaultRootWindow (dpy),
gdk_x11_get_xatom_by_name_for_display (display, "GDK_VISUALS"),
0, 2, False, XA_INTEGER, &type_return,
&format_return, &nitems_return,
&bytes_after_return, &data) == Success)
{
if (type_return == XA_INTEGER &&
format_return == 32 &&
nitems_return == 2 &&
data != NULL)
{
long *visuals = (long *) data;
*system = (int)visuals[0];
*rgba = (int)visuals[1];
found = TRUE;
}
}
gdk_x11_display_error_trap_pop_ignored (display);
if (data)
XFree (data);
return found;
}
static void
save_cached_gl_visuals (GdkDisplay *display, int system, int rgba)
{
long visualdata[2];
Display *dpy;
dpy = gdk_x11_display_get_xdisplay (display);
visualdata[0] = system;
visualdata[1] = rgba;
gdk_x11_display_error_trap_push (display);
XChangeProperty (dpy, DefaultRootWindow (dpy),
gdk_x11_get_xatom_by_name_for_display (display, "GDK_VISUALS"),
XA_INTEGER, 32, PropModeReplace,
(unsigned char *)visualdata, 2);
gdk_x11_display_error_trap_pop_ignored (display);
}
void
_gdk_x11_screen_update_visuals_for_gl (GdkScreen *screen)
{
GdkX11Screen *x11_screen;
GdkDisplay *display;
GdkX11Display *display_x11;
Display *dpy;
struct glvisualinfo *gl_info;
int i;
int system_visual_id, rgba_visual_id;
x11_screen = GDK_X11_SCREEN (screen);
display = x11_screen->display;
display_x11 = GDK_X11_DISPLAY (display);
dpy = gdk_x11_display_get_xdisplay (display);
/* We save the default visuals as a property on the root window to avoid
having to initialize GL each time, as it may not be used later. */
if (get_cached_gl_visuals (display, &system_visual_id, &rgba_visual_id))
{
for (i = 0; i < x11_screen->nvisuals; i++)
{
GdkVisual *visual = x11_screen->visuals[i];
int visual_id = gdk_x11_visual_get_xvisual (visual)->visualid;
if (visual_id == system_visual_id)
x11_screen->system_visual = visual;
if (visual_id == rgba_visual_id)
x11_screen->rgba_visual = visual;
}
return;
}
if (!gdk_x11_screen_init_gl (screen))
return;
gl_info = g_new0 (struct glvisualinfo, x11_screen->nvisuals);
for (i = 0; i < x11_screen->nvisuals; i++)
{
XVisualInfo *visual_list;
XVisualInfo visual_template;
int nxvisuals;
visual_template.screen = x11_screen->screen_num;
visual_template.visualid = gdk_x11_visual_get_xvisual (x11_screen->visuals[i])->visualid;
visual_list = XGetVisualInfo (x11_screen->xdisplay, VisualIDMask| VisualScreenMask, &visual_template, &nxvisuals);
if (visual_list == NULL)
continue;
glXGetConfig (dpy, &visual_list[0], GLX_USE_GL, &gl_info[i].supports_gl);
glXGetConfig (dpy, &visual_list[0], GLX_DOUBLEBUFFER, &gl_info[i].double_buffer);
glXGetConfig (dpy, &visual_list[0], GLX_STEREO, &gl_info[i].stereo);
glXGetConfig (dpy, &visual_list[0], GLX_ALPHA_SIZE, &gl_info[i].alpha_size);
glXGetConfig (dpy, &visual_list[0], GLX_DEPTH_SIZE, &gl_info[i].depth_size);
glXGetConfig (dpy, &visual_list[0], GLX_STENCIL_SIZE, &gl_info[i].stencil_size);
if (display_x11->has_glx_multisample)
glXGetConfig(dpy, &visual_list[0], GLX_SAMPLE_BUFFERS_ARB, &gl_info[i].num_multisample);
if (display_x11->has_glx_visual_rating)
glXGetConfig(dpy, &visual_list[0], GLX_VISUAL_CAVEAT_EXT, &gl_info[i].visual_caveat);
else
gl_info[i].visual_caveat = GLX_NONE_EXT;
XFree (visual_list);
}
x11_screen->system_visual = pick_better_visual_for_gl (x11_screen, gl_info, x11_screen->system_visual);
if (x11_screen->rgba_visual)
x11_screen->rgba_visual = pick_better_visual_for_gl (x11_screen, gl_info, x11_screen->rgba_visual);
g_free (gl_info);
save_cached_gl_visuals (display,
gdk_x11_visual_get_xvisual (x11_screen->system_visual)->visualid,
x11_screen->rgba_visual ? gdk_x11_visual_get_xvisual (x11_screen->rgba_visual)->visualid : 0);
}
GdkGLContext *
gdk_x11_window_create_gl_context (GdkWindow *window,
gboolean attached,
GdkGLContext *share,
GError **error)
{
GdkDisplay *display;
GdkX11GLContext *context;
GdkVisual *visual;
GLXFBConfig config;
display = gdk_window_get_display (window);
if (!gdk_x11_screen_init_gl (gdk_window_get_screen (window)))
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_NOT_AVAILABLE,
_("No GL implementation is available"));
return NULL;
}
if (!GDK_X11_DISPLAY (display)->has_glx_create_context)
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_UNSUPPORTED_PROFILE,
_("The GLX_ARB_create_context_profile extension "
"needed to create core profiles is not available"));
return NULL;
}
visual = gdk_window_get_visual (window);
if (!find_fbconfig_for_visual (display, visual, &config, error))
return NULL;
context = g_object_new (GDK_TYPE_X11_GL_CONTEXT,
"display", display,
"window", window,
"shared-context", share,
NULL);
context->glx_config = config;
context->is_attached = attached;
return GDK_GL_CONTEXT (context);
}
gboolean
gdk_x11_display_make_gl_context_current (GdkDisplay *display,
GdkGLContext *context)
{
GdkX11GLContext *context_x11;
Display *dpy = gdk_x11_display_get_xdisplay (display);
GdkWindow *window;
GdkScreen *screen;
gboolean do_frame_sync = FALSE;
if (context == NULL)
{
glXMakeContextCurrent (dpy, None, None, NULL);
return TRUE;
}
context_x11 = GDK_X11_GL_CONTEXT (context);
if (context_x11->glx_context == NULL)
{
g_critical ("No GLX context associated to the GdkGLContext; you must "
"call gdk_gl_context_realize() first.");
return FALSE;
}
GDK_NOTE (OPENGL,
g_print ("Making GLX context current to drawable %lu\n",
(unsigned long) context_x11->drawable));
if (!glXMakeContextCurrent (dpy, context_x11->drawable, context_x11->drawable,
context_x11->glx_context))
{
GDK_NOTE (OPENGL,
g_print ("Making GLX context current failed\n"));
return FALSE;
}
if (context_x11->is_attached && GDK_X11_DISPLAY (display)->has_glx_swap_interval)
{
window = gdk_gl_context_get_window (context);
/* If the WM is compositing there is no particular need to delay
* the swap when drawing on the offscreen, rendering to the screen
* happens later anyway, and its up to the compositor to sync that
* to the vblank. */
screen = gdk_window_get_screen (window);
do_frame_sync = ! gdk_screen_is_composited (screen);
if (do_frame_sync != context_x11->do_frame_sync)
{
context_x11->do_frame_sync = do_frame_sync;
if (do_frame_sync)
glXSwapIntervalSGI (1);
else
glXSwapIntervalSGI (0);
}
}
return TRUE;
}
/**
* gdk_x11_display_get_glx_version:
* @display: a #GdkDisplay
* @major: (out): return location for the GLX major version
* @minor: (out): return location for the GLX minor version
*
* Retrieves the version of the GLX implementation.
*
* Returns: %TRUE if GLX is available
*
* Since: 3.16
*/
gboolean
gdk_x11_display_get_glx_version (GdkDisplay *display,
gint *major,
gint *minor)
{
g_return_val_if_fail (GDK_IS_DISPLAY (display), FALSE);
if (!GDK_IS_X11_DISPLAY (display))
return FALSE;
if (!gdk_x11_screen_init_gl (gdk_display_get_default_screen (display)))
return FALSE;
if (major != NULL)
*major = GDK_X11_DISPLAY (display)->glx_version / 10;
if (minor != NULL)
*minor = GDK_X11_DISPLAY (display)->glx_version % 10;
return TRUE;
}
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