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gtk/gdk/gdkglcontext.c
Benjamin Otte dc6e831524 gdk: hdr => high depth 
The term "hdr" is so overloaded, we shouldn't use them anywhere, except
from maybe describing all of this work in blog posts and other marketing
materials.

So do renames:
* hdr => high_depth
* request_hdr => prefers_high_depth

This more accurately describes what is going on.
2021-10-06 22:50:07 +02:00

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/* GDK - The GIMP Drawing Kit
*
* gdkglcontext.c: GL context abstraction
*
* 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/>.
*/
/**
* GdkGLContext:
*
* `GdkGLContext` is an object representing a platform-specific
* OpenGL draw context.
*
* `GdkGLContext`s are created for a surface using
* [method@Gdk.Surface.create_gl_context], and the context will match
* the the characteristics of the surface.
*
* A `GdkGLContext` is not tied to any particular normal framebuffer.
* For instance, it cannot draw to the surface back buffer. The GDK
* repaint system is in full control of the painting to that. Instead,
* you can create render buffers or textures and use [func@cairo_draw_from_gl]
* in the draw function of your widget to draw them. Then GDK will handle
* the integration of your rendering with that of other widgets.
*
* Support for `GdkGLContext` is platform-specific and context creation
* can fail, returning %NULL context.
*
* A `GdkGLContext` has to be made "current" in order to start using
* it, otherwise any OpenGL call will be ignored.
*
* ## Creating a new OpenGL context
*
* In order to create a new `GdkGLContext` instance you need a `GdkSurface`,
* which you typically get during the realize call of a widget.
*
* A `GdkGLContext` is not realized until either [method@Gdk.GLContext.make_current]
* or [method@Gdk.GLContext.realize] is called. It is possible to specify
* details of the GL context like the OpenGL version to be used, or whether
* the GL context should have extra state validation enabled after calling
* [method@Gdk.Surface.create_gl_context] by calling [method@Gdk.GLContext.realize].
* If the realization fails you have the option to change the settings of
* the `GdkGLContext` and try again.
*
* ## Using a GdkGLContext
*
* You will need to make the `GdkGLContext` the current context before issuing
* OpenGL calls; the system sends OpenGL commands to whichever context is current.
* It is possible to have multiple contexts, so you always need to ensure that
* the one which you want to draw with is the current one before issuing commands:
*
* ```c
* gdk_gl_context_make_current (context);
* ```
*
* You can now perform your drawing using OpenGL commands.
*
* You can check which `GdkGLContext` is the current one by using
* [func@Gdk.GLContext.get_current]; you can also unset any `GdkGLContext`
* that is currently set by calling [func@Gdk.GLContext.clear_current].
*/
#include "config.h"
#include "gdkglcontextprivate.h"
#include "gdkdebug.h"
#include "gdkdisplayprivate.h"
#include "gdkintl.h"
#include "gdkmemoryformatprivate.h"
#include "gdkmemorytextureprivate.h"
#include "gdkprofilerprivate.h"
#include "gdk-private.h"
#ifdef GDK_WINDOWING_WIN32
# include "gdk/win32/gdkwin32.h"
#endif
#include <epoxy/gl.h>
#ifdef HAVE_EGL
#include <epoxy/egl.h>
#endif
typedef struct {
int major;
int minor;
int gl_version;
guint realized : 1;
guint has_khr_debug : 1;
guint use_khr_debug : 1;
guint has_unpack_subimage : 1;
guint has_debug_output : 1;
guint extensions_checked : 1;
guint debug_enabled : 1;
guint forward_compatible : 1;
guint is_legacy : 1;
int use_es;
int max_debug_label_length;
#ifdef HAVE_EGL
EGLContext egl_context;
#endif
} GdkGLContextPrivate;
enum {
PROP_0,
PROP_SHARED_CONTEXT,
LAST_PROP
};
static GParamSpec *obj_pspecs[LAST_PROP] = { NULL, };
G_DEFINE_QUARK (gdk-gl-error-quark, gdk_gl_error)
G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (GdkGLContext, gdk_gl_context, GDK_TYPE_DRAW_CONTEXT)
typedef struct _MaskedContext MaskedContext;
static inline MaskedContext *
mask_context (GdkGLContext *context,
gboolean surfaceless)
{
return (MaskedContext *) GSIZE_TO_POINTER (GPOINTER_TO_SIZE (context) | (surfaceless ? 1 : 0));
}
static inline GdkGLContext *
unmask_context (MaskedContext *mask)
{
return GDK_GL_CONTEXT (GSIZE_TO_POINTER (GPOINTER_TO_SIZE (mask) & ~(gsize) 1));
}
static void
unref_unmasked (gpointer data)
{
g_object_unref (unmask_context (data));
}
static GPrivate thread_current_context = G_PRIVATE_INIT (unref_unmasked);
static void
gdk_gl_context_clear_old_updated_area (GdkGLContext *context)
{
int i;
for (i = 0; i < 2; i++)
{
g_clear_pointer (&context->old_updated_area[i], cairo_region_destroy);
}
}
static void
gdk_gl_context_dispose (GObject *gobject)
{
GdkGLContext *context = GDK_GL_CONTEXT (gobject);
#ifdef HAVE_EGL
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
if (priv->egl_context != NULL)
{
GdkSurface *surface = gdk_gl_context_get_surface (context);
GdkDisplay *display = gdk_surface_get_display (surface);
EGLDisplay *egl_display = gdk_display_get_egl_display (display);
if (eglGetCurrentContext () == priv->egl_context)
eglMakeCurrent(egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
GDK_DISPLAY_NOTE (display, OPENGL, g_message ("Destroying EGL context"));
eglDestroyContext (egl_display, priv->egl_context);
priv->egl_context = NULL;
}
#endif
gdk_gl_context_clear_old_updated_area (context);
G_OBJECT_CLASS (gdk_gl_context_parent_class)->dispose (gobject);
}
static void
gdk_gl_context_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
switch (prop_id)
{
case PROP_SHARED_CONTEXT:
g_assert (g_value_get_object (value) == NULL);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
}
}
static void
gdk_gl_context_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
switch (prop_id)
{
case PROP_SHARED_CONTEXT:
g_value_set_object (value, NULL);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
}
}
void
gdk_gl_context_upload_texture (GdkGLContext *context,
const guchar *data,
int width,
int height,
int stride,
GdkMemoryFormat data_format,
guint texture_target)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
guchar *copy = NULL;
GLenum gl_internalformat;
GLenum gl_format;
GLenum gl_type;
gsize bpp;
g_return_if_fail (GDK_IS_GL_CONTEXT (context));
if (!gdk_memory_format_gl_format (data_format,
priv->use_es,
&gl_internalformat,
&gl_format,
&gl_type))
{
copy = g_malloc_n (width * 4, height);
gdk_memory_convert (copy, width * 4,
GDK_MEMORY_R8G8B8A8_PREMULTIPLIED,
data, stride,
data_format,
width, height);
data = copy;
data_format = GDK_MEMORY_R8G8B8A8_PREMULTIPLIED;
if (!gdk_memory_format_gl_format (data_format,
priv->use_es,
&gl_internalformat,
&gl_format,
&gl_type))
{
g_assert_not_reached ();
}
}
else
{
copy = NULL;
}
bpp = gdk_memory_format_bytes_per_pixel (data_format);
/* GL_UNPACK_ROW_LENGTH is available on desktop GL, OpenGL ES >= 3.0, or if
* the GL_EXT_unpack_subimage extension for OpenGL ES 2.0 is available
*/
if (stride == width * bpp)
{
glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
glTexImage2D (texture_target, 0, gl_internalformat, width, height, 0, gl_format, gl_type, data);
glPixelStorei (GL_UNPACK_ALIGNMENT, 4);
}
else if ((!priv->use_es ||
(priv->use_es && (priv->gl_version >= 30 || priv->has_unpack_subimage))))
{
glPixelStorei (GL_UNPACK_ROW_LENGTH, stride / bpp);
glTexImage2D (texture_target, 0, gl_internalformat, width, height, 0, gl_format, gl_type, data);
glPixelStorei (GL_UNPACK_ROW_LENGTH, 0);
}
else
{
int i;
glTexImage2D (texture_target, 0, gl_internalformat, width, height, 0, gl_format, gl_type, NULL);
for (i = 0; i < height; i++)
glTexSubImage2D (texture_target, 0, 0, i, width, 1, gl_format, gl_type, data + (i * stride));
}
g_free (copy);
}
#define N_EGL_ATTRS 16
static gboolean
gdk_gl_context_real_realize (GdkGLContext *context,
GError **error)
{
#if HAVE_EGL
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
GdkDisplay *display = gdk_gl_context_get_display (context);
EGLDisplay egl_display = gdk_display_get_egl_display (display);
if (egl_display)
{
EGLConfig egl_config;
GdkGLContext *share = gdk_display_get_gl_context (display);
GdkGLContextPrivate *share_priv = gdk_gl_context_get_instance_private (share);
EGLContext ctx;
EGLint context_attribs[N_EGL_ATTRS];
int major, minor, flags;
gboolean debug_bit, forward_bit, legacy_bit, use_es;
int i = 0;
G_GNUC_UNUSED gint64 start_time = GDK_PROFILER_CURRENT_TIME;
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_DISPLAY_DEBUG_CHECK (display, GL_LEGACY) ||
(share != NULL && gdk_gl_context_is_legacy (share));
use_es = GDK_DISPLAY_DEBUG_CHECK (display, GL_GLES) ||
(share != NULL && gdk_gl_context_get_use_es (share));
if (display->have_egl_no_config_context)
egl_config = NULL;
else
egl_config = gdk_display_get_egl_config (display);
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 if (eglBindAPI (EGL_OPENGL_ES_API))
{
context_attribs[i++] = EGL_CONTEXT_CLIENT_VERSION;
if (major == 3)
context_attribs[i++] = 3;
else
context_attribs[i++] = 2;
}
else
{
g_set_error_literal (error, GDK_GL_ERROR, GDK_GL_ERROR_NOT_AVAILABLE,
_("The EGL implementation supports neither OpenGL nor GLES"));
return FALSE;
}
/* 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_DISPLAY_NOTE (display, 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 (egl_display,
egl_config,
share != NULL ? share_priv->egl_context
: EGL_NO_CONTEXT,
context_attribs);
/* If context creation failed without the ES bit, let's try again with it */
if (ctx == NULL && eglBindAPI (EGL_OPENGL_ES_API))
{
i = 0;
context_attribs[i++] = EGL_CONTEXT_MAJOR_VERSION;
context_attribs[i++] = 2;
context_attribs[i++] = EGL_CONTEXT_MINOR_VERSION;
context_attribs[i++] = 0;
context_attribs[i++] = EGL_CONTEXT_FLAGS_KHR;
context_attribs[i++] = flags & ~EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR;
context_attribs[i++] = EGL_NONE;
g_assert (i < N_EGL_ATTRS);
legacy_bit = FALSE;
use_es = TRUE;
GDK_DISPLAY_NOTE (display, OPENGL,
g_message ("eglCreateContext failed, switching to OpenGL ES"));
ctx = eglCreateContext (egl_display,
egl_config,
share != NULL ? share_priv->egl_context
: EGL_NO_CONTEXT,
context_attribs);
}
/* If context creation failed without the legacy bit, let's try again with it */
if (ctx == NULL && eglBindAPI (EGL_OPENGL_API))
{
i = 0;
context_attribs[i++] = EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR;
context_attribs[i++] = EGL_CONTEXT_OPENGL_COMPATIBILITY_PROFILE_BIT_KHR;
context_attribs[i++] = EGL_CONTEXT_MAJOR_VERSION;
context_attribs[i++] = 3;
context_attribs[i++] = EGL_CONTEXT_MINOR_VERSION;
context_attribs[i++] = 0;
context_attribs[i++] = EGL_CONTEXT_FLAGS_KHR;
context_attribs[i++] = flags & ~EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR;
context_attribs[i++] = EGL_NONE;
g_assert (i < N_EGL_ATTRS);
legacy_bit = TRUE;
use_es = FALSE;
GDK_DISPLAY_NOTE (display, OPENGL,
g_message ("eglCreateContext failed, switching to legacy"));
ctx = eglCreateContext (egl_display,
egl_config,
share != NULL ? share_priv->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_DISPLAY_NOTE (display, OPENGL, g_message ("Created EGL context[%p]", ctx));
priv->egl_context = ctx;
gdk_gl_context_set_is_legacy (context, legacy_bit);
gdk_gl_context_set_use_es (context, use_es);
gdk_profiler_end_mark (start_time, "realize GdkWaylandGLContext", NULL);
return TRUE;
}
#endif
g_set_error_literal (error, GDK_GL_ERROR, GDK_GL_ERROR_NOT_AVAILABLE,
_("The current backend does not support OpenGL"));
return FALSE;
}
#undef N_EGL_ATTRS
static cairo_region_t *
gdk_gl_context_real_get_damage (GdkGLContext *context)
{
GdkSurface *surface = gdk_draw_context_get_surface (GDK_DRAW_CONTEXT (context));
#ifdef HAVE_EGL
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
GdkDisplay *display = gdk_draw_context_get_display (GDK_DRAW_CONTEXT (context));
if (priv->egl_context && display->have_egl_buffer_age)
{
EGLSurface egl_surface;
int buffer_age = 0;
egl_surface = gdk_surface_get_egl_surface (surface);
gdk_gl_context_make_current (context);
eglQuerySurface (gdk_display_get_egl_display (display), egl_surface,
EGL_BUFFER_AGE_EXT, &buffer_age);
switch (buffer_age)
{
case 1:
return cairo_region_create ();
break;
case 2:
if (context->old_updated_area[0])
return cairo_region_copy (context->old_updated_area[0]);
break;
case 3:
if (context->old_updated_area[0] &&
context->old_updated_area[1])
{
cairo_region_t *damage = cairo_region_copy (context->old_updated_area[0]);
cairo_region_union (damage, context->old_updated_area[1]);
return damage;
}
break;
default:
;
}
}
#endif
return cairo_region_create_rectangle (&(GdkRectangle) {
0, 0,
gdk_surface_get_width (surface),
gdk_surface_get_height (surface)
});
}
static gboolean
gdk_gl_context_real_is_shared (GdkGLContext *self,
GdkGLContext *other)
{
if (gdk_draw_context_get_display (GDK_DRAW_CONTEXT (self)) != gdk_draw_context_get_display (GDK_DRAW_CONTEXT (other)))
return FALSE;
/* XXX: Should we check es or legacy here? */
return TRUE;
}
static gboolean
gdk_gl_context_real_clear_current (GdkGLContext *context)
{
GdkDisplay *display = gdk_gl_context_get_display (context);
#ifdef HAVE_EGL
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
if (priv->egl_context == NULL)
return FALSE;
return eglMakeCurrent (gdk_display_get_egl_display (display),
EGL_NO_SURFACE,
EGL_NO_SURFACE,
EGL_NO_CONTEXT);
#else
return FALSE;
#endif
}
static gboolean
gdk_gl_context_real_make_current (GdkGLContext *context,
gboolean surfaceless)
{
#ifdef HAVE_EGL
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
GdkDisplay *display = gdk_gl_context_get_display (context);
EGLSurface egl_surface;
if (priv->egl_context == NULL)
return FALSE;
if (!surfaceless)
egl_surface = gdk_surface_get_egl_surface (gdk_gl_context_get_surface (context));
else
egl_surface = EGL_NO_SURFACE;
return eglMakeCurrent (gdk_display_get_egl_display (display),
egl_surface,
egl_surface,
priv->egl_context);
#else
return FALSE;
#endif
}
static void
gdk_gl_context_real_begin_frame (GdkDrawContext *draw_context,
gboolean prefers_high_depth,
cairo_region_t *region)
{
GdkGLContext *context = GDK_GL_CONTEXT (draw_context);
G_GNUC_UNUSED GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
GdkSurface *surface;
cairo_region_t *damage;
int ww, wh;
surface = gdk_draw_context_get_surface (draw_context);
#ifdef HAVE_EGL
if (priv->egl_context)
gdk_surface_ensure_egl_surface (surface, prefers_high_depth);
#endif
damage = GDK_GL_CONTEXT_GET_CLASS (context)->get_damage (context);
if (context->old_updated_area[1])
cairo_region_destroy (context->old_updated_area[1]);
context->old_updated_area[1] = context->old_updated_area[0];
context->old_updated_area[0] = cairo_region_copy (region);
cairo_region_union (region, damage);
cairo_region_destroy (damage);
ww = gdk_surface_get_width (surface) * gdk_surface_get_scale_factor (surface);
wh = gdk_surface_get_height (surface) * gdk_surface_get_scale_factor (surface);
gdk_gl_context_make_current (context);
/* Initial setup */
glClearColor (0.0f, 0.0f, 0.0f, 0.0f);
glDisable (GL_DEPTH_TEST);
glDisable (GL_BLEND);
glBlendFunc (GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
glViewport (0, 0, ww, wh);
}
static void
gdk_gl_context_real_end_frame (GdkDrawContext *draw_context,
cairo_region_t *painted)
{
#ifdef HAVE_EGL
GdkGLContext *context = GDK_GL_CONTEXT (draw_context);
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
GdkSurface *surface = gdk_gl_context_get_surface (context);
GdkDisplay *display = gdk_surface_get_display (surface);
EGLSurface egl_surface;
if (priv->egl_context == NULL)
return;
gdk_gl_context_make_current (context);
egl_surface = gdk_surface_get_egl_surface (surface);
gdk_profiler_add_mark (GDK_PROFILER_CURRENT_TIME, 0, "EGL", "swap buffers");
if (display->have_egl_swap_buffers_with_damage)
{
EGLint stack_rects[4 * 4]; /* 4 rects */
EGLint *heap_rects = NULL;
int i, j, n_rects = cairo_region_num_rectangles (painted);
int surface_height = gdk_surface_get_height (surface);
int scale = gdk_surface_get_scale_factor (surface);
EGLint *rects;
if (n_rects < G_N_ELEMENTS (stack_rects) / 4)
rects = (EGLint *)&stack_rects;
else
heap_rects = rects = g_new (EGLint, n_rects * 4);
for (i = 0, j = 0; i < n_rects; i++)
{
cairo_rectangle_int_t rect;
cairo_region_get_rectangle (painted, i, &rect);
rects[j++] = rect.x * scale;
rects[j++] = (surface_height - rect.height - rect.y) * scale;
rects[j++] = rect.width * scale;
rects[j++] = rect.height * scale;
}
eglSwapBuffersWithDamageEXT (gdk_display_get_egl_display (display), egl_surface, rects, n_rects);
g_free (heap_rects);
}
else
eglSwapBuffers (gdk_display_get_egl_display (display), egl_surface);
#endif
}
static void
gdk_gl_context_surface_resized (GdkDrawContext *draw_context)
{
GdkGLContext *context = GDK_GL_CONTEXT (draw_context);
gdk_gl_context_clear_old_updated_area (context);
}
static void
gdk_gl_context_class_init (GdkGLContextClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GdkDrawContextClass *draw_context_class = GDK_DRAW_CONTEXT_CLASS (klass);
klass->realize = gdk_gl_context_real_realize;
klass->get_damage = gdk_gl_context_real_get_damage;
klass->is_shared = gdk_gl_context_real_is_shared;
klass->make_current = gdk_gl_context_real_make_current;
klass->clear_current = gdk_gl_context_real_clear_current;
draw_context_class->begin_frame = gdk_gl_context_real_begin_frame;
draw_context_class->end_frame = gdk_gl_context_real_end_frame;
draw_context_class->surface_resized = gdk_gl_context_surface_resized;
/**
* GdkGLContext:shared-context: (attributes org.gtk.Property.get=gdk_gl_context_get_shared_context)
*
* Always %NULL
*
* As many contexts can share data now and no single shared context exists
* anymore, this function has been deprecated and now always returns %NULL.
*
* Deprecated: 4.4: Use [method@Gdk.GLContext.is_shared] to check if contexts
* can be shared.
*/
obj_pspecs[PROP_SHARED_CONTEXT] =
g_param_spec_object ("shared-context",
P_("Shared context"),
P_("The GL context this context shares data with"),
GDK_TYPE_GL_CONTEXT,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS |
G_PARAM_DEPRECATED);
gobject_class->set_property = gdk_gl_context_set_property;
gobject_class->get_property = gdk_gl_context_get_property;
gobject_class->dispose = gdk_gl_context_dispose;
g_object_class_install_properties (gobject_class, LAST_PROP, obj_pspecs);
}
static void
gdk_gl_context_init (GdkGLContext *self)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (self);
priv->use_es = -1;
}
/* Must have called gdk_display_prepare_gl() before */
GdkGLContext *
gdk_gl_context_new_for_surface (GdkSurface *surface)
{
GdkDisplay *display = gdk_surface_get_display (surface);
GdkGLContext *shared = gdk_display_get_gl_context (display);
/* assert gdk_display_prepare_gl() had been called */
g_assert (shared);
return g_object_new (G_OBJECT_TYPE (shared),
"surface", surface,
NULL);
}
void
gdk_gl_context_push_debug_group (GdkGLContext *context,
const char *message)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
if (priv->use_khr_debug)
glPushDebugGroupKHR (GL_DEBUG_SOURCE_APPLICATION, 0, -1, message);
}
void
gdk_gl_context_push_debug_group_printf (GdkGLContext *context,
const char *format,
...)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
char *message;
va_list args;
if (priv->use_khr_debug)
{
int msg_len;
va_start (args, format);
message = g_strdup_vprintf (format, args);
va_end (args);
msg_len = MIN (priv->max_debug_label_length, strlen (message) - 1);
glPushDebugGroupKHR (GL_DEBUG_SOURCE_APPLICATION, 0, msg_len, message);
g_free (message);
}
}
void
gdk_gl_context_pop_debug_group (GdkGLContext *context)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
if (priv->use_khr_debug)
glPopDebugGroupKHR ();
}
void
gdk_gl_context_label_object (GdkGLContext *context,
guint identifier,
guint name,
const char *label)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
if (priv->use_khr_debug)
glObjectLabel (identifier, name, -1, label);
}
void
gdk_gl_context_label_object_printf (GdkGLContext *context,
guint identifier,
guint name,
const char *format,
...)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
char *message;
va_list args;
if (priv->use_khr_debug)
{
int msg_len;
va_start (args, format);
message = g_strdup_vprintf (format, args);
va_end (args);
msg_len = MIN (priv->max_debug_label_length, strlen (message) - 1);
glObjectLabel (identifier, name, msg_len, message);
g_free (message);
}
}
gboolean
gdk_gl_context_has_unpack_subimage (GdkGLContext *context)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
return priv->has_unpack_subimage;
}
/**
* gdk_gl_context_set_debug_enabled:
* @context: a `GdkGLContext`
* @enabled: whether to enable debugging in the context
*
* Sets whether the `GdkGLContext` should perform extra validations and
* runtime checking.
*
* This is useful during development, but has additional overhead.
*
* The `GdkGLContext` must not be realized or made current prior to
* calling this function.
*/
void
gdk_gl_context_set_debug_enabled (GdkGLContext *context,
gboolean enabled)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
g_return_if_fail (GDK_IS_GL_CONTEXT (context));
g_return_if_fail (!priv->realized);
enabled = !!enabled;
priv->debug_enabled = enabled;
}
/**
* gdk_gl_context_get_debug_enabled:
* @context: a `GdkGLContext`
*
* Retrieves whether the context is doing extra validations and runtime checking.
*
* See [method@Gdk.GLContext.set_debug_enabled].
*
* Returns: %TRUE if debugging is enabled
*/
gboolean
gdk_gl_context_get_debug_enabled (GdkGLContext *context)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
g_return_val_if_fail (GDK_IS_GL_CONTEXT (context), FALSE);
return priv->debug_enabled;
}
/**
* gdk_gl_context_set_forward_compatible:
* @context: a `GdkGLContext`
* @compatible: whether the context should be forward-compatible
*
* Sets whether the `GdkGLContext` should be forward-compatible.
*
* Forward-compatible contexts must not support OpenGL functionality that
* has been marked as deprecated in the requested version; non-forward
* compatible contexts, on the other hand, must support both deprecated and
* non deprecated functionality.
*
* The `GdkGLContext` must not be realized or made current prior to calling
* this function.
*/
void
gdk_gl_context_set_forward_compatible (GdkGLContext *context,
gboolean compatible)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
g_return_if_fail (GDK_IS_GL_CONTEXT (context));
g_return_if_fail (!priv->realized);
compatible = !!compatible;
priv->forward_compatible = compatible;
}
/**
* gdk_gl_context_get_forward_compatible:
* @context: a `GdkGLContext`
*
* Retrieves whether the context is forward-compatible.
*
* See [method@Gdk.GLContext.set_forward_compatible].
*
* Returns: %TRUE if the context should be forward-compatible
*/
gboolean
gdk_gl_context_get_forward_compatible (GdkGLContext *context)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
g_return_val_if_fail (GDK_IS_GL_CONTEXT (context), FALSE);
return priv->forward_compatible;
}
/**
* gdk_gl_context_set_required_version:
* @context: a `GdkGLContext`
* @major: the major version to request
* @minor: the minor version to request
*
* Sets the major and minor version of OpenGL to request.
*
* Setting @major and @minor to zero will use the default values.
*
* The `GdkGLContext` must not be realized or made current prior to calling
* this function.
*/
void
gdk_gl_context_set_required_version (GdkGLContext *context,
int major,
int minor)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
gboolean force_gles = FALSE;
int version, min_ver;
#ifdef G_ENABLE_DEBUG
GdkDisplay *display;
#endif
g_return_if_fail (GDK_IS_GL_CONTEXT (context));
g_return_if_fail (!priv->realized);
/* this will take care of the default */
if (major == 0 && minor == 0)
{
priv->major = 0;
priv->minor = 0;
return;
}
version = (major * 100) + minor;
#ifdef G_ENABLE_DEBUG
display = gdk_draw_context_get_display (GDK_DRAW_CONTEXT (context));
force_gles = GDK_DISPLAY_DEBUG_CHECK (display, GL_GLES);
#endif
/* Enforce a minimum context version number of 3.2 for desktop GL,
* and 2.0 for GLES
*/
if (priv->use_es > 0 || force_gles)
min_ver = 200;
else
min_ver = 302;
if (version < min_ver)
{
g_warning ("gdk_gl_context_set_required_version - GL context versions less than 3.2 are not supported.");
version = min_ver;
}
priv->major = version / 100;
priv->minor = version % 100;
}
/**
* gdk_gl_context_get_required_version:
* @context: a `GdkGLContext`
* @major: (out) (nullable): return location for the major version to request
* @minor: (out) (nullable): return location for the minor version to request
*
* Retrieves required OpenGL version.
*
* See [method@Gdk.GLContext.set_required_version].
*/
void
gdk_gl_context_get_required_version (GdkGLContext *context,
int *major,
int *minor)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
gboolean force_gles = FALSE;
#ifdef G_ENABLE_DEBUG
GdkDisplay *display;
#endif
int default_major, default_minor;
int maj, min;
g_return_if_fail (GDK_IS_GL_CONTEXT (context));
#ifdef G_ENABLE_DEBUG
display = gdk_draw_context_get_display (GDK_DRAW_CONTEXT (context));
force_gles = GDK_DISPLAY_DEBUG_CHECK (display, GL_GLES);
#endif
/* Default fallback values for uninitialised contexts; we
* enforce a context version number of 3.2 for desktop GL,
* and 2.0 for GLES
*/
if (priv->use_es > 0 || force_gles)
{
default_major = 2;
default_minor = 0;
}
else
{
default_major = 3;
default_minor = 2;
}
if (priv->major > 0)
maj = priv->major;
else
maj = default_major;
if (priv->minor > 0)
min = priv->minor;
else
min = default_minor;
if (major != NULL)
*major = maj;
if (minor != NULL)
*minor = min;
}
/**
* gdk_gl_context_is_legacy:
* @context: a `GdkGLContext`
*
* Whether the `GdkGLContext` is in legacy mode or not.
*
* The `GdkGLContext` must be realized before calling this function.
*
* When realizing a GL context, GDK will try to use the OpenGL 3.2 core
* profile; this profile removes all the OpenGL API that was deprecated
* prior to the 3.2 version of the specification. If the realization is
* successful, this function will return %FALSE.
*
* If the underlying OpenGL implementation does not support core profiles,
* GDK will fall back to a pre-3.2 compatibility profile, and this function
* will return %TRUE.
*
* You can use the value returned by this function to decide which kind
* of OpenGL API to use, or whether to do extension discovery, or what
* kind of shader programs to load.
*
* Returns: %TRUE if the GL context is in legacy mode
*/
gboolean
gdk_gl_context_is_legacy (GdkGLContext *context)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
g_return_val_if_fail (GDK_IS_GL_CONTEXT (context), FALSE);
g_return_val_if_fail (priv->realized, FALSE);
return priv->is_legacy;
}
void
gdk_gl_context_set_is_legacy (GdkGLContext *context,
gboolean is_legacy)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
priv->is_legacy = !!is_legacy;
}
/**
* gdk_gl_context_is_shared:
* @self: a `GdkGLContext`
* @other: the `GdkGLContext` that should be compatible with @self
*
* Checks if the two GL contexts can share resources.
*
* When they can, the texture IDs from @other can be used in @self. This
* is particularly useful when passing `GdkGLTexture` objects between
* different contexts.
*
* Contexts created for the same display with the same properties will
* always be compatible, even if they are created for different surfaces.
* For other contexts it depends on the GL backend.
*
* Both contexts must be realized for this check to succeed. If either one
* is not, this function will return %FALSE.
*
* Returns: %TRUE if the two GL contexts are compatible.
*
* Since: 4.4
*/
gboolean
gdk_gl_context_is_shared (GdkGLContext *self,
GdkGLContext *other)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (self);
GdkGLContextPrivate *priv_other = gdk_gl_context_get_instance_private (other);
g_return_val_if_fail (GDK_IS_GL_CONTEXT (self), FALSE);
g_return_val_if_fail (GDK_IS_GL_CONTEXT (other), FALSE);
if (!priv->realized || !priv_other->realized)
return FALSE;
return GDK_GL_CONTEXT_GET_CLASS (self)->is_shared (self, other);
}
/**
* gdk_gl_context_set_use_es:
* @context: a `GdkGLContext`
* @use_es: whether the context should use OpenGL ES instead of OpenGL,
* or -1 to allow auto-detection
*
* Requests that GDK create an OpenGL ES context instead of an OpenGL one.
*
* Not all platforms support OpenGL ES.
*
* The @context must not have been realized.
*
* By default, GDK will attempt to automatically detect whether the
* underlying GL implementation is OpenGL or OpenGL ES once the @context
* is realized.
*
* You should check the return value of [method@Gdk.GLContext.get_use_es]
* after calling [method@Gdk.GLContext.realize] to decide whether to use
* the OpenGL or OpenGL ES API, extensions, or shaders.
*/
void
gdk_gl_context_set_use_es (GdkGLContext *context,
int use_es)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
g_return_if_fail (GDK_IS_GL_CONTEXT (context));
g_return_if_fail (!priv->realized);
if (priv->use_es != use_es)
priv->use_es = use_es;
}
/**
* gdk_gl_context_get_use_es:
* @context: a `GdkGLContext`
*
* Checks whether the @context is using an OpenGL or OpenGL ES profile.
*
* Returns: %TRUE if the `GdkGLContext` is using an OpenGL ES profile
*/
gboolean
gdk_gl_context_get_use_es (GdkGLContext *context)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
g_return_val_if_fail (GDK_IS_GL_CONTEXT (context), FALSE);
if (!priv->realized)
return FALSE;
return priv->use_es > 0;
}
static void APIENTRY
gl_debug_message_callback (GLenum source,
GLenum type,
GLuint id,
GLenum severity,
GLsizei length,
const GLchar *message,
const void *user_data)
{
const char *message_source;
const char *message_type;
const char *message_severity;
if (severity == GL_DEBUG_SEVERITY_NOTIFICATION)
return;
switch (source)
{
case GL_DEBUG_SOURCE_API:
message_source = "API";
break;
case GL_DEBUG_SOURCE_WINDOW_SYSTEM:
message_source = "Window System";
break;
case GL_DEBUG_SOURCE_SHADER_COMPILER:
message_source = "Shader Compiler";
break;
case GL_DEBUG_SOURCE_THIRD_PARTY:
message_source = "Third Party";
break;
case GL_DEBUG_SOURCE_APPLICATION:
message_source = "Application";
break;
case GL_DEBUG_SOURCE_OTHER:
default:
message_source = "Other";
}
switch (type)
{
case GL_DEBUG_TYPE_ERROR:
message_type = "Error";
break;
case GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR:
message_type = "Deprecated Behavior";
break;
case GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR:
message_type = "Undefined Behavior";
break;
case GL_DEBUG_TYPE_PORTABILITY:
message_type = "Portability";
break;
case GL_DEBUG_TYPE_PERFORMANCE:
message_type = "Performance";
break;
case GL_DEBUG_TYPE_MARKER:
message_type = "Marker";
break;
case GL_DEBUG_TYPE_PUSH_GROUP:
message_type = "Push Group";
break;
case GL_DEBUG_TYPE_POP_GROUP:
message_type = "Pop Group";
break;
case GL_DEBUG_TYPE_OTHER:
default:
message_type = "Other";
}
switch (severity)
{
case GL_DEBUG_SEVERITY_HIGH:
message_severity = "High";
break;
case GL_DEBUG_SEVERITY_MEDIUM:
message_severity = "Medium";
break;
case GL_DEBUG_SEVERITY_LOW:
message_severity = "Low";
break;
case GL_DEBUG_SEVERITY_NOTIFICATION:
message_severity = "Notification";
break;
default:
message_severity = "Unknown";
}
g_warning ("OPENGL:\n Source: %s\n Type: %s\n Severity: %s\n Message: %s",
message_source, message_type, message_severity, message);
}
/**
* gdk_gl_context_realize:
* @context: a `GdkGLContext`
* @error: return location for a `GError`
*
* Realizes the given `GdkGLContext`.
*
* It is safe to call this function on a realized `GdkGLContext`.
*
* Returns: %TRUE if the context is realized
*/
gboolean
gdk_gl_context_realize (GdkGLContext *context,
GError **error)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
g_return_val_if_fail (GDK_IS_GL_CONTEXT (context), FALSE);
if (priv->realized)
return TRUE;
priv->realized = GDK_GL_CONTEXT_GET_CLASS (context)->realize (context, error);
return priv->realized;
}
static void
gdk_gl_context_check_extensions (GdkGLContext *context)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
gboolean gl_debug = FALSE;
#ifdef G_ENABLE_DEBUG
GdkDisplay *display;
#endif
if (!priv->realized)
return;
if (priv->extensions_checked)
return;
priv->gl_version = epoxy_gl_version ();
if (priv->use_es < 0)
priv->use_es = !epoxy_is_desktop_gl ();
priv->has_debug_output = epoxy_has_gl_extension ("GL_ARB_debug_output") ||
epoxy_has_gl_extension ("GL_KHR_debug");
#ifdef G_ENABLE_DEBUG
display = gdk_draw_context_get_display (GDK_DRAW_CONTEXT (context));
gl_debug = GDK_DISPLAY_DEBUG_CHECK (display, GL_DEBUG);
#endif
if (priv->has_debug_output
#ifndef G_ENABLE_CONSISTENCY_CHECKS
&& gl_debug
#endif
)
{
gdk_gl_context_make_current (context);
glEnable (GL_DEBUG_OUTPUT);
glEnable (GL_DEBUG_OUTPUT_SYNCHRONOUS);
glDebugMessageCallback (gl_debug_message_callback, NULL);
}
if (priv->use_es)
{
priv->has_unpack_subimage = epoxy_has_gl_extension ("GL_EXT_unpack_subimage");
priv->has_khr_debug = epoxy_has_gl_extension ("GL_KHR_debug");
}
else
{
priv->has_unpack_subimage = TRUE;
priv->has_khr_debug = epoxy_has_gl_extension ("GL_KHR_debug");
/* We asked for a core profile, but we didn't get one, so we're in legacy mode */
if (priv->gl_version < 32)
priv->is_legacy = TRUE;
}
if (priv->has_khr_debug && gl_debug)
{
priv->use_khr_debug = TRUE;
glGetIntegerv (GL_MAX_LABEL_LENGTH, &priv->max_debug_label_length);
}
GDK_DISPLAY_NOTE (gdk_draw_context_get_display (GDK_DRAW_CONTEXT (context)), OPENGL,
g_message ("%s version: %d.%d (%s)\n"
"* GLSL version: %s\n"
"* Extensions checked:\n"
" - GL_KHR_debug: %s\n"
" - GL_EXT_unpack_subimage: %s",
priv->use_es ? "OpenGL ES" : "OpenGL",
priv->gl_version / 10, priv->gl_version % 10,
priv->is_legacy ? "legacy" : "core",
glGetString (GL_SHADING_LANGUAGE_VERSION),
priv->has_khr_debug ? "yes" : "no",
priv->has_unpack_subimage ? "yes" : "no"));
priv->extensions_checked = TRUE;
}
/**
* gdk_gl_context_make_current:
* @context: a `GdkGLContext`
*
* Makes the @context the current one.
*/
void
gdk_gl_context_make_current (GdkGLContext *context)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
MaskedContext *current, *masked_context;
gboolean surfaceless;
g_return_if_fail (GDK_IS_GL_CONTEXT (context));
surfaceless = !gdk_draw_context_is_in_frame (GDK_DRAW_CONTEXT (context));
masked_context = mask_context (context, surfaceless);
current = g_private_get (&thread_current_context);
if (current == masked_context)
return;
/* we need to realize the GdkGLContext if it wasn't explicitly realized */
if (!priv->realized)
{
GError *error = NULL;
gdk_gl_context_realize (context, &error);
if (error != NULL)
{
g_critical ("Could not realize the GL context: %s", error->message);
g_error_free (error);
return;
}
}
if (!GDK_GL_CONTEXT_GET_CLASS (context)->make_current (context, surfaceless))
{
g_warning ("gdk_gl_context_make_current() failed");
return;
}
g_object_ref (context);
g_private_replace (&thread_current_context, masked_context);
gdk_gl_context_check_extensions (context);
}
/**
* gdk_gl_context_get_display:
* @context: a `GdkGLContext`
*
* Retrieves the display the @context is created for
*
* Returns: (nullable) (transfer none): a `GdkDisplay`
*/
GdkDisplay *
gdk_gl_context_get_display (GdkGLContext *context)
{
g_return_val_if_fail (GDK_IS_GL_CONTEXT (context), NULL);
return gdk_draw_context_get_display (GDK_DRAW_CONTEXT (context));
}
/**
* gdk_gl_context_get_surface:
* @context: a `GdkGLContext`
*
* Retrieves the surface used by the @context.
*
* Returns: (nullable) (transfer none): a `GdkSurface`
*/
GdkSurface *
gdk_gl_context_get_surface (GdkGLContext *context)
{
g_return_val_if_fail (GDK_IS_GL_CONTEXT (context), NULL);
return gdk_draw_context_get_surface (GDK_DRAW_CONTEXT (context));
}
/**
* gdk_gl_context_get_shared_context: (attributes org.gtk.Method.get_property=shared-context)
* @context: a `GdkGLContext`
*
* Used to retrieves the `GdkGLContext` that this @context share data with.
*
* As many contexts can share data now and no single shared context exists
* anymore, this function has been deprecated and now always returns %NULL.
*
* Returns: (nullable) (transfer none): %NULL
*
* Deprecated: 4.4: Use [method@Gdk.GLContext.is_shared] to check if contexts
* can be shared.
*/
GdkGLContext *
gdk_gl_context_get_shared_context (GdkGLContext *context)
{
g_return_val_if_fail (GDK_IS_GL_CONTEXT (context), NULL);
return NULL;
}
/**
* gdk_gl_context_get_version:
* @context: a `GdkGLContext`
* @major: (out): return location for the major version
* @minor: (out): return location for the minor version
*
* Retrieves the OpenGL version of the @context.
*
* The @context must be realized prior to calling this function.
*/
void
gdk_gl_context_get_version (GdkGLContext *context,
int *major,
int *minor)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
g_return_if_fail (GDK_IS_GL_CONTEXT (context));
g_return_if_fail (priv->realized);
if (major != NULL)
*major = priv->gl_version / 10;
if (minor != NULL)
*minor = priv->gl_version % 10;
}
/**
* gdk_gl_context_clear_current:
*
* Clears the current `GdkGLContext`.
*
* Any OpenGL call after this function returns will be ignored
* until [method@Gdk.GLContext.make_current] is called.
*/
void
gdk_gl_context_clear_current (void)
{
MaskedContext *current;
current = g_private_get (&thread_current_context);
if (current != NULL)
{
GdkGLContext *context = unmask_context (current);
if (GDK_GL_CONTEXT_GET_CLASS (context)->clear_current (context))
g_private_replace (&thread_current_context, NULL);
}
}
/**
* gdk_gl_context_get_current:
*
* Retrieves the current `GdkGLContext`.
*
* Returns: (nullable) (transfer none): the current `GdkGLContext`
*/
GdkGLContext *
gdk_gl_context_get_current (void)
{
MaskedContext *current;
current = g_private_get (&thread_current_context);
return unmask_context (current);
}
gboolean
gdk_gl_context_has_debug (GdkGLContext *self)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (self);
return priv->debug_enabled || priv->use_khr_debug;
}
/* This is currently private! */
/* When using GL/ES, don't flip the 'R' and 'B' bits on Windows/ANGLE for glReadPixels() */
gboolean
gdk_gl_context_use_es_bgra (GdkGLContext *context)
{
if (!gdk_gl_context_get_use_es (context))
return FALSE;
#ifdef GDK_WINDOWING_WIN32
if (GDK_WIN32_IS_GL_CONTEXT (context))
return TRUE;
#endif
return FALSE;
}
static GdkGLBackend the_gl_backend_type = GDK_GL_NONE;
static const char *gl_backend_names[] = {
[GDK_GL_NONE] = "No GL (You should never read this)",
[GDK_GL_EGL] = "EGL",
[GDK_GL_GLX] = "X11 GLX",
[GDK_GL_WGL] = "Windows WGL",
[GDK_GL_CGL] = "Apple CGL"
};
/*<private>
* gdk_gl_backend_can_be_used:
* @backend_type: Type of backend to check
* @error: Return location for an error
*
* Checks if this backend type can be used. When multiple displays
* are opened that use different GL backends, conflicts can arise,
* so this function checks that all displays use compatible GL
* backends.
*
* Returns: %TRUE if the backend can still be used
*/
gboolean
gdk_gl_backend_can_be_used (GdkGLBackend backend_type,
GError **error)
{
if (the_gl_backend_type == GDK_GL_NONE ||
the_gl_backend_type == backend_type)
return TRUE;
g_set_error (error, GDK_GL_ERROR, GDK_GL_ERROR_NOT_AVAILABLE,
/* translators: This is about OpenGL backend names, like
* "Trying to use X11 GLX, but EGL is already in use" */
_("Trying to use %s, but %s is already in use"),
gl_backend_names[backend_type],
gl_backend_names[the_gl_backend_type]);
return FALSE;
}
/*<private>
* gdk_gl_backend_use:
* @backend_type: Type of backend
*
* Ensures that the backend in use is the given one. If another backend
* is already in use, this function will abort the program. It should
* have previously checked via gdk_gl_backend_can_be_used().
**/
void
gdk_gl_backend_use (GdkGLBackend backend_type)
{
/* Check that the context class is properly initializing its backend type */
g_assert (backend_type != GDK_GL_NONE);
if (the_gl_backend_type == GDK_GL_NONE)
{
the_gl_backend_type = backend_type;
/* This is important!!!11eleven
* (But really: How do I print a message in 2 categories?) */
GDK_NOTE (OPENGL, g_print ("Using OpenGL backend %s\n", gl_backend_names[the_gl_backend_type]));
GDK_NOTE (MISC, g_message ("Using Opengl backend %s", gl_backend_names[the_gl_backend_type]));
}
g_assert (the_gl_backend_type == backend_type);
}
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