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gtk2/gdk/gdkglcontext.c
Benjamin Otte c7320df0c9 gdk: Add gdk_gl_context_is_shared() 
... and use it in the GL renderers.
2021-07-22 16:27:31 +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 "gdkdisplayprivate.h"
#include "gdkmemorytextureprivate.h"
#include "gdkinternals.h"
#include "gdkintl.h"
#include "gdk-private.h"
#ifdef GDK_WINDOWING_WIN32
# include "gdk/win32/gdkwin32.h"
#endif
#include <epoxy/gl.h>
typedef struct {
GdkGLContext *shared_context;
int major;
int minor;
int gl_version;
guint realized : 1;
guint use_texture_rectangle : 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;
GdkGLContextPaintData *paint_data;
} 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)
static GPrivate thread_current_context = G_PRIVATE_INIT (g_object_unref);
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);
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
GdkGLContext *current;
gdk_gl_context_clear_old_updated_area (context);
current = g_private_get (&thread_current_context);
if (current == context)
g_private_replace (&thread_current_context, NULL);
g_clear_object (&priv->shared_context);
G_OBJECT_CLASS (gdk_gl_context_parent_class)->dispose (gobject);
}
static void
gdk_gl_context_finalize (GObject *gobject)
{
GdkGLContext *context = GDK_GL_CONTEXT (gobject);
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
g_clear_pointer (&priv->paint_data, g_free);
G_OBJECT_CLASS (gdk_gl_context_parent_class)->finalize (gobject);
}
static void
gdk_gl_context_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private ((GdkGLContext *) gobject);
switch (prop_id)
{
case PROP_SHARED_CONTEXT:
{
GdkGLContext *context = g_value_get_object (value);
if (context != NULL)
priv->shared_context = g_object_ref (context);
}
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)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private ((GdkGLContext *) gobject);
switch (prop_id)
{
case PROP_SHARED_CONTEXT:
g_value_set_object (value, priv->shared_context);
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;
guint gl_format;
guint gl_type;
guint bpp;
g_return_if_fail (GDK_IS_GL_CONTEXT (context));
if (priv->use_es)
{
/* GLES only supports rgba, so convert if necessary */
if (data_format != GDK_MEMORY_R8G8B8A8_PREMULTIPLIED)
{
copy = g_malloc (width * height * 4);
gdk_memory_convert (copy, width * 4,
GDK_MEMORY_R8G8B8A8_PREMULTIPLIED,
data, stride, data_format,
width, height);
stride = width * 4;
data = copy;
}
bpp = 4;
gl_format = GL_RGBA;
gl_type = GL_UNSIGNED_BYTE;
}
else
{
if (data_format == GDK_MEMORY_DEFAULT) /* Cairo surface format */
{
gl_format = GL_BGRA;
gl_type = GL_UNSIGNED_INT_8_8_8_8_REV;
bpp = 4;
}
else if (data_format == GDK_MEMORY_R8G8B8) /* Pixmap non-alpha data */
{
gl_format = GL_RGB;
gl_type = GL_UNSIGNED_BYTE;
bpp = 3;
}
else if (data_format == GDK_MEMORY_B8G8R8)
{
gl_format = GL_BGR;
gl_type = GL_UNSIGNED_BYTE;
bpp = 3;
}
else /* Fall-back, convert to cairo-surface-format */
{
copy = g_malloc (width * height * 4);
gdk_memory_convert (copy, width * 4,
GDK_MEMORY_DEFAULT,
data, stride, data_format,
width, height);
stride = width * 4;
bpp = 4;
data = copy;
gl_format = GL_BGRA;
gl_type = GL_UNSIGNED_INT_8_8_8_8_REV;
}
}
/* 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_RGBA, 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_RGBA, width, height, 0, gl_format, gl_type, data);
glPixelStorei (GL_UNPACK_ROW_LENGTH, 0);
}
else
{
int i;
glTexImage2D (texture_target, 0, GL_RGBA, 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);
}
static gboolean
gdk_gl_context_real_realize (GdkGLContext *self,
GError **error)
{
g_set_error_literal (error, GDK_GL_ERROR, GDK_GL_ERROR_NOT_AVAILABLE,
"The current backend does not support OpenGL");
return FALSE;
}
static cairo_region_t *
gdk_gl_context_real_get_damage (GdkGLContext *context)
{
GdkSurface *surface = gdk_draw_context_get_surface (GDK_DRAW_CONTEXT (context));
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 void
gdk_gl_context_real_begin_frame (GdkDrawContext *draw_context,
cairo_region_t *region)
{
GdkGLContext *context = GDK_GL_CONTEXT (draw_context);
GdkSurface *surface;
GdkGLContext *shared;
cairo_region_t *damage;
int ww, wh;
shared = gdk_gl_context_get_shared_context (context);
if (shared)
{
GDK_DRAW_CONTEXT_GET_CLASS (GDK_DRAW_CONTEXT (shared))->begin_frame (GDK_DRAW_CONTEXT (shared), region);
return;
}
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);
surface = gdk_draw_context_get_surface (draw_context);
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)
{
GdkGLContext *context = GDK_GL_CONTEXT (draw_context);
GdkGLContext *shared;
shared = gdk_gl_context_get_shared_context (context);
if (shared)
{
GDK_DRAW_CONTEXT_GET_CLASS (GDK_DRAW_CONTEXT (shared))->end_frame (GDK_DRAW_CONTEXT (shared), painted);
return;
}
}
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;
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)
*
* The `GdkGLContext` that this context is sharing data with, or %NULL
*/
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);
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;
gobject_class->finalize = gdk_gl_context_finalize;
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;
}
GdkGLContextPaintData *
gdk_gl_context_get_paint_data (GdkGLContext *context)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
if (priv->paint_data == NULL)
{
priv->paint_data = g_new0 (GdkGLContextPaintData, 1);
priv->paint_data->is_legacy = priv->is_legacy;
priv->paint_data->use_es = priv->use_es;
}
return priv->paint_data;
}
gboolean
gdk_gl_context_use_texture_rectangle (GdkGLContext *context)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
return priv->use_texture_rectangle;
}
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.
*/
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 has_npot, has_texture_rectangle;
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)
{
has_npot = priv->gl_version >= 20;
has_texture_rectangle = FALSE;
priv->has_unpack_subimage = epoxy_has_gl_extension ("GL_EXT_unpack_subimage");
priv->has_khr_debug = epoxy_has_gl_extension ("GL_KHR_debug");
}
else
{
has_npot = priv->gl_version >= 20 || epoxy_has_gl_extension ("GL_ARB_texture_non_power_of_two");
has_texture_rectangle = priv->gl_version >= 31 || epoxy_has_gl_extension ("GL_ARB_texture_rectangle");
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);
}
if (!priv->use_es && GDK_DISPLAY_DEBUG_CHECK (gdk_draw_context_get_display (GDK_DRAW_CONTEXT (context)), GL_TEXTURE_RECT))
priv->use_texture_rectangle = TRUE;
else if (has_npot)
priv->use_texture_rectangle = FALSE;
else if (has_texture_rectangle)
priv->use_texture_rectangle = TRUE;
else
g_warning ("GL implementation doesn't support any form of non-power-of-two textures");
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_ARB_texture_non_power_of_two: %s\n"
" - GL_ARB_texture_rectangle: %s\n"
" - GL_KHR_debug: %s\n"
" - GL_EXT_unpack_subimage: %s\n"
"* Using texture rectangle: %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),
has_npot ? "yes" : "no",
has_texture_rectangle ? "yes" : "no",
priv->has_khr_debug ? "yes" : "no",
priv->has_unpack_subimage ? "yes" : "no",
priv->use_texture_rectangle ? "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);
GdkGLContext *current;
g_return_if_fail (GDK_IS_GL_CONTEXT (context));
current = g_private_get (&thread_current_context);
if (current == 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_display_make_gl_context_current (gdk_draw_context_get_display (GDK_DRAW_CONTEXT (context)), context))
{
g_private_replace (&thread_current_context, g_object_ref (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`
*
* Retrieves the `GdkGLContext` that this @context share data with.
*
* Returns: (nullable) (transfer none): a `GdkGLContext`
*/
GdkGLContext *
gdk_gl_context_get_shared_context (GdkGLContext *context)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
g_return_val_if_fail (GDK_IS_GL_CONTEXT (context), NULL);
return priv->shared_context;
}
/**
* 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)
{
GdkGLContext *current;
current = g_private_get (&thread_current_context);
if (current != NULL)
{
if (gdk_display_make_gl_context_current (gdk_draw_context_get_display (GDK_DRAW_CONTEXT (current)), NULL))
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)
{
GdkGLContext *current;
current = g_private_get (&thread_current_context);
return 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;
}
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