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gtk/gdk/wayland/gdkglcontext-wayland.c
Dominique Martinet 0e5fe45ea2 gdk_wayland_display_init_gl: use GLES API if required 
gdk_wayland_gl_context_realize properly checks for GLES and uses
eglBindAPI with the proper API, but before that init is always called
with regular GL interface which is not implemented for many embedded
devices.

This was fixed in GTK 4 with commit 482845b027 ("wayland: Remove
initial GL API bind"), but that commit cannot easily be applied because
the current version queries some GL properties during init so we would
need to backport more for it to be applicable.

This patch takes the minimal approach of initializing GLES context,
allowing the gtk3 demo OpenGL test (and real applications) to work
when GDK_GL=gles is set.

Fixes https://gitlab.gnome.org/GNOME/gtk/-/issues/3028
2022-09-28 14:34:41 +09:00

571 lines
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/* GDK - The GIMP Drawing Kit
*
* gdkglcontext-wayland.c: Wayland specific OpenGL wrappers
*
* Copyright © 2014 Emmanuele Bassi
* Copyright © 2014 Alexander Larsson
*
* 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-wayland.h"
#include "gdkdisplay-wayland.h"
#include "gdkwaylanddisplay.h"
#include "gdkwaylandglcontext.h"
#include "gdkwaylandwindow.h"
#include "gdkprivate-wayland.h"
#include "gdkinternals.h"
#include "gdkintl.h"
G_DEFINE_TYPE (GdkWaylandGLContext, gdk_wayland_gl_context, GDK_TYPE_GL_CONTEXT)
static void gdk_x11_gl_context_dispose (GObject *gobject);
void
gdk_wayland_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);
GdkWaylandDisplay *display_wayland = GDK_WAYLAND_DISPLAY (display);
GdkWaylandGLContext *context_wayland;
int buffer_age;
gboolean invalidate_all;
EGLSurface egl_surface;
/* Minimal update is ok if we're not drawing with gl */
if (window->gl_paint_context == NULL)
return;
context_wayland = GDK_WAYLAND_GL_CONTEXT (window->gl_paint_context);
buffer_age = 0;
egl_surface = gdk_wayland_window_get_egl_surface (window->impl_window,
context_wayland->egl_config);
if (display_wayland->have_egl_buffer_age)
{
gdk_gl_context_make_current (window->gl_paint_context);
eglQuerySurface (display_wayland->egl_display, egl_surface,
EGL_BUFFER_AGE_EXT, &buffer_age);
}
invalidate_all = FALSE;
if (buffer_age == 0 || buffer_age >= 4)
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);
}
}
#define N_EGL_ATTRS 16
static gboolean
gdk_wayland_gl_context_realize (GdkGLContext *context,
GError **error)
{
GdkWaylandGLContext *context_wayland = GDK_WAYLAND_GL_CONTEXT (context);
GdkDisplay *display = gdk_gl_context_get_display (context);
GdkGLContext *share = gdk_gl_context_get_shared_context (context);
GdkWaylandDisplay *display_wayland = GDK_WAYLAND_DISPLAY (display);
EGLContext ctx;
EGLint context_attribs[N_EGL_ATTRS];
int major, minor, flags;
gboolean debug_bit, forward_bit, legacy_bit, use_es;
int i = 0;
gdk_gl_context_get_required_version (context, &major, &minor);
debug_bit = gdk_gl_context_get_debug_enabled (context);
forward_bit = gdk_gl_context_get_forward_compatible (context);
legacy_bit = (_gdk_gl_flags & GDK_GL_LEGACY) != 0 ||
(share != NULL && gdk_gl_context_is_legacy (share));
use_es = (_gdk_gl_flags & GDK_GL_GLES) != 0 ||
(share != NULL && gdk_gl_context_get_use_es (share));
flags = 0;
if (debug_bit)
flags |= EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR;
if (forward_bit)
flags |= EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR;
if (!use_es)
{
eglBindAPI (EGL_OPENGL_API);
/* We want a core profile, unless in legacy mode */
context_attribs[i++] = EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR;
context_attribs[i++] = legacy_bit
? EGL_CONTEXT_OPENGL_COMPATIBILITY_PROFILE_BIT_KHR
: EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT_KHR;
/* Specify the version */
context_attribs[i++] = EGL_CONTEXT_MAJOR_VERSION_KHR;
context_attribs[i++] = legacy_bit ? 3 : major;
context_attribs[i++] = EGL_CONTEXT_MINOR_VERSION_KHR;
context_attribs[i++] = legacy_bit ? 0 : minor;
}
else
{
eglBindAPI (EGL_OPENGL_ES_API);
context_attribs[i++] = EGL_CONTEXT_CLIENT_VERSION;
if (major == 3)
context_attribs[i++] = 3;
else
context_attribs[i++] = 2;
}
/* Specify the flags */
context_attribs[i++] = EGL_CONTEXT_FLAGS_KHR;
context_attribs[i++] = flags;
context_attribs[i++] = EGL_NONE;
g_assert (i < N_EGL_ATTRS);
GDK_NOTE (OPENGL, g_message ("Creating EGL context version %d.%d (debug:%s, forward:%s, legacy:%s, es:%s)",
major, minor,
debug_bit ? "yes" : "no",
forward_bit ? "yes" : "no",
legacy_bit ? "yes" : "no",
use_es ? "yes" : "no"));
ctx = eglCreateContext (display_wayland->egl_display,
context_wayland->egl_config,
share != NULL ? GDK_WAYLAND_GL_CONTEXT (share)->egl_context
: EGL_NO_CONTEXT,
context_attribs);
/* If context creation failed without the legacy bit, let's try again with it */
if (ctx == NULL && !legacy_bit)
{
/* Ensure that re-ordering does not break the offsets */
g_assert (context_attribs[0] == EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR);
context_attribs[1] = EGL_CONTEXT_OPENGL_COMPATIBILITY_PROFILE_BIT_KHR;
context_attribs[3] = 3;
context_attribs[5] = 0;
eglBindAPI (EGL_OPENGL_API);
legacy_bit = TRUE;
use_es = FALSE;
GDK_NOTE (OPENGL, g_message ("eglCreateContext failed, switching to legacy"));
ctx = eglCreateContext (display_wayland->egl_display,
context_wayland->egl_config,
share != NULL ? GDK_WAYLAND_GL_CONTEXT (share)->egl_context
: EGL_NO_CONTEXT,
context_attribs);
}
if (ctx == NULL)
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_NOT_AVAILABLE,
_("Unable to create a GL context"));
return FALSE;
}
GDK_NOTE (OPENGL, g_message ("Created EGL context[%p]", ctx));
context_wayland->egl_context = ctx;
gdk_gl_context_set_is_legacy (context, legacy_bit);
gdk_gl_context_set_use_es (context, use_es);
return TRUE;
}
static void
gdk_wayland_gl_context_end_frame (GdkGLContext *context,
cairo_region_t *painted,
cairo_region_t *damage)
{
GdkWindow *window = gdk_gl_context_get_window (context);
GdkDisplay *display = gdk_window_get_display (window);
GdkWaylandDisplay *display_wayland = GDK_WAYLAND_DISPLAY (display);
GdkWaylandGLContext *context_wayland = GDK_WAYLAND_GL_CONTEXT (context);
EGLSurface egl_surface;
gdk_gl_context_make_current (context);
egl_surface = gdk_wayland_window_get_egl_surface (window->impl_window,
context_wayland->egl_config);
if (display_wayland->have_egl_swap_buffers_with_damage)
{
int i, j, n_rects = cairo_region_num_rectangles (damage);
EGLint *rects = g_new (EGLint, n_rects * 4);
cairo_rectangle_int_t rect;
int window_height = gdk_window_get_height (window);
for (i = 0, j = 0; i < n_rects; i++)
{
cairo_region_get_rectangle (damage, i, &rect);
rects[j++] = rect.x;
rects[j++] = window_height - rect.height - rect.y;
rects[j++] = rect.width;
rects[j++] = rect.height;
}
eglSwapBuffersWithDamageEXT (display_wayland->egl_display, egl_surface, rects, n_rects);
g_free (rects);
}
else
eglSwapBuffers (display_wayland->egl_display, egl_surface);
}
static void
gdk_wayland_gl_context_class_init (GdkWaylandGLContextClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GdkGLContextClass *context_class = GDK_GL_CONTEXT_CLASS (klass);
gobject_class->dispose = gdk_x11_gl_context_dispose;
context_class->realize = gdk_wayland_gl_context_realize;
context_class->end_frame = gdk_wayland_gl_context_end_frame;
}
static void
gdk_wayland_gl_context_init (GdkWaylandGLContext *self)
{
}
static EGLDisplay
gdk_wayland_get_display (GdkWaylandDisplay *display_wayland)
{
EGLDisplay dpy = NULL;
if (epoxy_has_egl_extension (NULL, "EGL_KHR_platform_base"))
{
PFNEGLGETPLATFORMDISPLAYPROC getPlatformDisplay =
(void *) eglGetProcAddress ("eglGetPlatformDisplay");
if (getPlatformDisplay)
dpy = getPlatformDisplay (EGL_PLATFORM_WAYLAND_EXT,
display_wayland->wl_display,
NULL);
if (dpy)
return dpy;
}
if (epoxy_has_egl_extension (NULL, "EGL_EXT_platform_base"))
{
PFNEGLGETPLATFORMDISPLAYEXTPROC getPlatformDisplay =
(void *) eglGetProcAddress ("eglGetPlatformDisplayEXT");
if (getPlatformDisplay)
dpy = getPlatformDisplay (EGL_PLATFORM_WAYLAND_EXT,
display_wayland->wl_display,
NULL);
if (dpy)
return dpy;
}
return eglGetDisplay ((EGLNativeDisplayType) display_wayland->wl_display);
}
gboolean
gdk_wayland_display_init_gl (GdkDisplay *display,
GdkGLContext *share)
{
GdkWaylandDisplay *display_wayland = GDK_WAYLAND_DISPLAY (display);
EGLint major, minor;
EGLDisplay dpy;
gboolean use_es;
if (display_wayland->have_egl)
return TRUE;
dpy = gdk_wayland_get_display (display_wayland);
if (dpy == NULL)
return FALSE;
if (!eglInitialize (dpy, &major, &minor))
return FALSE;
use_es = (_gdk_gl_flags & GDK_GL_GLES) != 0 ||
(share != NULL && gdk_gl_context_get_use_es (share));
if (!eglBindAPI (use_es ? EGL_OPENGL_ES_API : EGL_OPENGL_API))
return FALSE;
display_wayland->egl_display = dpy;
display_wayland->egl_major_version = major;
display_wayland->egl_minor_version = minor;
display_wayland->have_egl = TRUE;
display_wayland->have_egl_khr_create_context =
epoxy_has_egl_extension (dpy, "EGL_KHR_create_context");
display_wayland->have_egl_buffer_age =
epoxy_has_egl_extension (dpy, "EGL_EXT_buffer_age");
display_wayland->have_egl_swap_buffers_with_damage =
epoxy_has_egl_extension (dpy, "EGL_EXT_swap_buffers_with_damage");
display_wayland->have_egl_surfaceless_context =
epoxy_has_egl_extension (dpy, "EGL_KHR_surfaceless_context");
GDK_NOTE (OPENGL,
g_message ("EGL API version %d.%d found\n"
" - Vendor: %s\n"
" - Version: %s\n"
" - Client APIs: %s\n"
" - Extensions:\n"
"\t%s",
display_wayland->egl_major_version,
display_wayland->egl_minor_version,
eglQueryString (dpy, EGL_VENDOR),
eglQueryString (dpy, EGL_VERSION),
eglQueryString (dpy, EGL_CLIENT_APIS),
eglQueryString (dpy, EGL_EXTENSIONS)));
return TRUE;
}
#define MAX_EGL_ATTRS 30
static gboolean
find_eglconfig_for_window (GdkWindow *window,
EGLConfig *egl_config_out,
EGLint *min_swap_interval_out,
GError **error)
{
GdkDisplay *display = gdk_window_get_display (window);
GdkWaylandDisplay *display_wayland = GDK_WAYLAND_DISPLAY (display);
GdkVisual *visual = gdk_window_get_visual (window);
EGLint attrs[MAX_EGL_ATTRS];
EGLint count;
EGLConfig *configs, chosen_config;
gboolean use_rgba;
int i = 0;
attrs[i++] = EGL_SURFACE_TYPE;
attrs[i++] = EGL_WINDOW_BIT;
attrs[i++] = EGL_COLOR_BUFFER_TYPE;
attrs[i++] = EGL_RGB_BUFFER;
attrs[i++] = EGL_RED_SIZE;
attrs[i++] = 8;
attrs[i++] = EGL_GREEN_SIZE;
attrs[i++] = 8;
attrs[i++] = EGL_BLUE_SIZE;
attrs[i++] = 8;
use_rgba = (visual == gdk_screen_get_rgba_visual (gdk_display_get_default_screen (display)));
if (use_rgba)
{
attrs[i++] = EGL_ALPHA_SIZE;
attrs[i++] = 8;
}
else
{
attrs[i++] = EGL_ALPHA_SIZE;
attrs[i++] = 0;
}
attrs[i++] = EGL_NONE;
g_assert (i < MAX_EGL_ATTRS);
if (!eglChooseConfig (display_wayland->egl_display, attrs, NULL, 0, &count) || count < 1)
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_UNSUPPORTED_FORMAT,
_("No available configurations for the given pixel format"));
return FALSE;
}
configs = g_new (EGLConfig, count);
if (!eglChooseConfig (display_wayland->egl_display, attrs, configs, count, &count) || count < 1)
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_UNSUPPORTED_FORMAT,
_("No available configurations for the given pixel format"));
return FALSE;
}
/* Pick first valid configuration i guess? */
chosen_config = configs[0];
if (!eglGetConfigAttrib (display_wayland->egl_display, chosen_config,
EGL_MIN_SWAP_INTERVAL, min_swap_interval_out))
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_NOT_AVAILABLE,
"Could not retrieve the minimum swap interval");
g_free (configs);
return FALSE;
}
if (egl_config_out != NULL)
*egl_config_out = chosen_config;
g_free (configs);
return TRUE;
}
GdkGLContext *
gdk_wayland_window_create_gl_context (GdkWindow *window,
gboolean attached,
GdkGLContext *share,
GError **error)
{
GdkDisplay *display = gdk_window_get_display (window);
GdkWaylandDisplay *display_wayland = GDK_WAYLAND_DISPLAY (display);
GdkWaylandGLContext *context;
EGLConfig config;
if (!gdk_wayland_display_init_gl (display, share))
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_NOT_AVAILABLE,
_("No GL implementation is available"));
return NULL;
}
if (!display_wayland->have_egl_khr_create_context)
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_UNSUPPORTED_PROFILE,
_("Core GL is not available on EGL implementation"));
return NULL;
}
if (!find_eglconfig_for_window (window, &config,
&display_wayland->egl_min_swap_interval,
error))
return NULL;
context = g_object_new (GDK_TYPE_WAYLAND_GL_CONTEXT,
"display", display,
"window", window,
"shared-context", share,
NULL);
context->egl_config = config;
context->is_attached = attached;
return GDK_GL_CONTEXT (context);
}
static void
gdk_x11_gl_context_dispose (GObject *gobject)
{
GdkWaylandGLContext *context_wayland = GDK_WAYLAND_GL_CONTEXT (gobject);
if (context_wayland->egl_context != NULL)
{
GdkGLContext *context = GDK_GL_CONTEXT (gobject);
GdkWindow *window = gdk_gl_context_get_window (context);
GdkDisplay *display = gdk_window_get_display (window);
GdkWaylandDisplay *display_wayland = GDK_WAYLAND_DISPLAY (display);
if (eglGetCurrentContext () == context_wayland->egl_context)
eglMakeCurrent(display_wayland->egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE,
EGL_NO_CONTEXT);
GDK_NOTE (OPENGL, g_message ("Destroying EGL context"));
eglDestroyContext (display_wayland->egl_display,
context_wayland->egl_context);
context_wayland->egl_context = NULL;
}
G_OBJECT_CLASS (gdk_wayland_gl_context_parent_class)->dispose (gobject);
}
gboolean
gdk_wayland_display_make_gl_context_current (GdkDisplay *display,
GdkGLContext *context)
{
GdkWaylandDisplay *display_wayland = GDK_WAYLAND_DISPLAY (display);
GdkWaylandGLContext *context_wayland;
GdkWindow *window;
EGLSurface egl_surface;
if (context == NULL)
{
eglMakeCurrent(display_wayland->egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE,
EGL_NO_CONTEXT);
return TRUE;
}
context_wayland = GDK_WAYLAND_GL_CONTEXT (context);
window = gdk_gl_context_get_window (context);
if (context_wayland->is_attached)
egl_surface = gdk_wayland_window_get_egl_surface (window->impl_window, context_wayland->egl_config);
else
{
if (display_wayland->have_egl_surfaceless_context)
egl_surface = EGL_NO_SURFACE;
else
egl_surface = gdk_wayland_window_get_dummy_egl_surface (window->impl_window,
context_wayland->egl_config);
}
if (!eglMakeCurrent (display_wayland->egl_display, egl_surface,
egl_surface, context_wayland->egl_context))
{
g_warning ("eglMakeCurrent failed");
return FALSE;
}
if (display_wayland->egl_min_swap_interval == 0)
eglSwapInterval (display_wayland->egl_display, 0);
else
g_debug ("Can't disable GL swap interval");
return TRUE;
}
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