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gtk2/gdk/gdkglcontext.h

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gdk: Add support for OpenGL This adds the new type GdkGLContext that wraps an OpenGL context for a particular native window. It also adds support for the gdk paint machinery to use OpenGL to draw everything. As soon as anyone creates a GL context for a native window we create a "paint context" for that GdkWindow and switch to using GL for painting it. This commit contains only an implementation for X11 (using GLX). The way painting works is that all client gl contexts draw into offscreen buffers rather than directly to the back buffer, and the way something gets onto the window is by using gdk_cairo_draw_from_gl() to draw part of that buffer onto the draw cairo context. As a fallback (if we're doing redirected drawing or some effect like a cairo_push_group()) we read back the gl buffer into memory and composite using cairo. This means that GL rendering works in all cases, including rendering to a PDF. However, this is not particularly fast. In the *typical* case, where we're drawing directly to the window in the regular paint loop we hit the fast path. The fast path uses opengl to draw the buffer to the window back buffer, either by blitting or texturing. Then we track the region that was drawn, and when the draw ends we paint the normal cairo surface to the window (using texture-from-pixmap in the X11 case, or texture from cairo image otherwise) in the regions where there is no gl painted. There are some complexities wrt layering of gl and cairo areas though: * We track via gdk_window_mark_paint_from_clip() whenever gtk is painting over a region we previously rendered with opengl (flushed_region). This area (needs_blend_region) is blended rather than copied at the end of the frame. * If we're drawing a gl texture with alpha we first copy the current cairo_surface inside the target region to the back buffer before we blend over it. These two operations allow us full stacking of transparent gl and cairo regions.
2014-10-09 08:45:44 +00:00
/* GDK - The GIMP Drawing Kit
*
* gdkglcontext.h: 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/>.
*/
#ifndef __GDK_GL_CONTEXT_H__
#define __GDK_GL_CONTEXT_H__
Use a single compilation symbol We use a compilation symbol in our build to allow the inclusion of specific headers while building GTK, to avoid the need to include only the global header. Each namespace has its own compilation symbol because we used to have different libraries, and strict symbol visibility between libraries; now that we have a single library, and we can use private symbols across namespaces while building GTK, we should have a single compilation symbol, and simplify the build rules.
2019-11-27 13:33:43 +00:00
#if !defined (__GDK_H_INSIDE__) && !defined (GTK_COMPILATION)
gdk: Add support for OpenGL This adds the new type GdkGLContext that wraps an OpenGL context for a particular native window. It also adds support for the gdk paint machinery to use OpenGL to draw everything. As soon as anyone creates a GL context for a native window we create a "paint context" for that GdkWindow and switch to using GL for painting it. This commit contains only an implementation for X11 (using GLX). The way painting works is that all client gl contexts draw into offscreen buffers rather than directly to the back buffer, and the way something gets onto the window is by using gdk_cairo_draw_from_gl() to draw part of that buffer onto the draw cairo context. As a fallback (if we're doing redirected drawing or some effect like a cairo_push_group()) we read back the gl buffer into memory and composite using cairo. This means that GL rendering works in all cases, including rendering to a PDF. However, this is not particularly fast. In the *typical* case, where we're drawing directly to the window in the regular paint loop we hit the fast path. The fast path uses opengl to draw the buffer to the window back buffer, either by blitting or texturing. Then we track the region that was drawn, and when the draw ends we paint the normal cairo surface to the window (using texture-from-pixmap in the X11 case, or texture from cairo image otherwise) in the regions where there is no gl painted. There are some complexities wrt layering of gl and cairo areas though: * We track via gdk_window_mark_paint_from_clip() whenever gtk is painting over a region we previously rendered with opengl (flushed_region). This area (needs_blend_region) is blended rather than copied at the end of the frame. * If we're drawing a gl texture with alpha we first copy the current cairo_surface inside the target region to the back buffer before we blend over it. These two operations allow us full stacking of transparent gl and cairo regions.
2014-10-09 08:45:44 +00:00
#error "Only <gdk/gdk.h> can be included directly."
#endif
#include <gdk/gdkversionmacros.h>
#include <gdk/gdktypes.h>
G_BEGIN_DECLS
#define GDK_TYPE_GL_CONTEXT (gdk_gl_context_get_type ())
#define GDK_GL_CONTEXT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GDK_TYPE_GL_CONTEXT, GdkGLContext))
#define GDK_IS_GL_CONTEXT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GDK_TYPE_GL_CONTEXT))
#define GDK_GL_ERROR (gdk_gl_error_quark ())
The big versioning cleanup Remove all the old 2.x and 3.x version annotations. GTK+ 4 is a new start, and from the perspective of a GTK+ 4 developer all these APIs have been around since the beginning.
2018-02-05 19:13:20 +00:00
GDK_AVAILABLE_IN_ALL
gdk: Add support for OpenGL This adds the new type GdkGLContext that wraps an OpenGL context for a particular native window. It also adds support for the gdk paint machinery to use OpenGL to draw everything. As soon as anyone creates a GL context for a native window we create a "paint context" for that GdkWindow and switch to using GL for painting it. This commit contains only an implementation for X11 (using GLX). The way painting works is that all client gl contexts draw into offscreen buffers rather than directly to the back buffer, and the way something gets onto the window is by using gdk_cairo_draw_from_gl() to draw part of that buffer onto the draw cairo context. As a fallback (if we're doing redirected drawing or some effect like a cairo_push_group()) we read back the gl buffer into memory and composite using cairo. This means that GL rendering works in all cases, including rendering to a PDF. However, this is not particularly fast. In the *typical* case, where we're drawing directly to the window in the regular paint loop we hit the fast path. The fast path uses opengl to draw the buffer to the window back buffer, either by blitting or texturing. Then we track the region that was drawn, and when the draw ends we paint the normal cairo surface to the window (using texture-from-pixmap in the X11 case, or texture from cairo image otherwise) in the regions where there is no gl painted. There are some complexities wrt layering of gl and cairo areas though: * We track via gdk_window_mark_paint_from_clip() whenever gtk is painting over a region we previously rendered with opengl (flushed_region). This area (needs_blend_region) is blended rather than copied at the end of the frame. * If we're drawing a gl texture with alpha we first copy the current cairo_surface inside the target region to the back buffer before we blend over it. These two operations allow us full stacking of transparent gl and cairo regions.
2014-10-09 08:45:44 +00:00
GQuark gdk_gl_error_quark (void);
The big versioning cleanup Remove all the old 2.x and 3.x version annotations. GTK+ 4 is a new start, and from the perspective of a GTK+ 4 developer all these APIs have been around since the beginning.
2018-02-05 19:13:20 +00:00
GDK_AVAILABLE_IN_ALL
gdk: Add support for OpenGL This adds the new type GdkGLContext that wraps an OpenGL context for a particular native window. It also adds support for the gdk paint machinery to use OpenGL to draw everything. As soon as anyone creates a GL context for a native window we create a "paint context" for that GdkWindow and switch to using GL for painting it. This commit contains only an implementation for X11 (using GLX). The way painting works is that all client gl contexts draw into offscreen buffers rather than directly to the back buffer, and the way something gets onto the window is by using gdk_cairo_draw_from_gl() to draw part of that buffer onto the draw cairo context. As a fallback (if we're doing redirected drawing or some effect like a cairo_push_group()) we read back the gl buffer into memory and composite using cairo. This means that GL rendering works in all cases, including rendering to a PDF. However, this is not particularly fast. In the *typical* case, where we're drawing directly to the window in the regular paint loop we hit the fast path. The fast path uses opengl to draw the buffer to the window back buffer, either by blitting or texturing. Then we track the region that was drawn, and when the draw ends we paint the normal cairo surface to the window (using texture-from-pixmap in the X11 case, or texture from cairo image otherwise) in the regions where there is no gl painted. There are some complexities wrt layering of gl and cairo areas though: * We track via gdk_window_mark_paint_from_clip() whenever gtk is painting over a region we previously rendered with opengl (flushed_region). This area (needs_blend_region) is blended rather than copied at the end of the frame. * If we're drawing a gl texture with alpha we first copy the current cairo_surface inside the target region to the back buffer before we blend over it. These two operations allow us full stacking of transparent gl and cairo regions.
2014-10-09 08:45:44 +00:00
GType gdk_gl_context_get_type (void) G_GNUC_CONST;
The big versioning cleanup Remove all the old 2.x and 3.x version annotations. GTK+ 4 is a new start, and from the perspective of a GTK+ 4 developer all these APIs have been around since the beginning.
2018-02-05 19:13:20 +00:00
GDK_AVAILABLE_IN_ALL
GL: Split GL context creation in two phases One of the major requests by OpenGL users has been the ability to specify settings when creating a GL context, like the version to use or whether the debug support should be enabled. We have a couple of requirements in terms of API: • avoid, if at all possible, the "C arrays of integers with attribute, value pairs", which are hard to write and hard to bind in non-C languages. • allow failing in a recoverable way. • do not make the GL context creation API a mess of arguments. Looking at prior art, it seems that a common pattern is to split the construction phase in two: • a first phase that creates a GL context wrapper object and does preliminary checks on the environment. • a second phase that creates the backend-specific GL object. We adopted a similar pattern: • gdk_window_create_gl_context() creates a GdkGLContext • gdk_gl_context_realize() creates the underlying resources Calling gdk_gl_context_make_current() also realizes the context, so simple GL users do not need to care. Advanced users will want to call gdk_window_create_gl_context(), set up the optional requirements, and then call gdk_gl_context_realize(). If either of these two steps fails, it's possible to recover by changing the requirements, or simply creating a new GdkGLContext instance. https://bugzilla.gnome.org/show_bug.cgi?id=741946
2015-01-27 21:23:23 +00:00
GdkDisplay * gdk_gl_context_get_display (GdkGLContext *context);
The big versioning cleanup Remove all the old 2.x and 3.x version annotations. GTK+ 4 is a new start, and from the perspective of a GTK+ 4 developer all these APIs have been around since the beginning.
2018-02-05 19:13:20 +00:00
GDK_AVAILABLE_IN_ALL
gl: Deprecate gdk_gl_context_get_shared_context() It's not used anymore. And in particular we do want to keep the display context private, so we're not gonna return it from this function.
2021-07-10 01:24:00 +00:00
GdkSurface * gdk_gl_context_get_surface (GdkGLContext *context);
GDK_DEPRECATED_IN_4_4_FOR(gdk_gl_context_is_shared)
GL: Split GL context creation in two phases One of the major requests by OpenGL users has been the ability to specify settings when creating a GL context, like the version to use or whether the debug support should be enabled. We have a couple of requirements in terms of API: • avoid, if at all possible, the "C arrays of integers with attribute, value pairs", which are hard to write and hard to bind in non-C languages. • allow failing in a recoverable way. • do not make the GL context creation API a mess of arguments. Looking at prior art, it seems that a common pattern is to split the construction phase in two: • a first phase that creates a GL context wrapper object and does preliminary checks on the environment. • a second phase that creates the backend-specific GL object. We adopted a similar pattern: • gdk_window_create_gl_context() creates a GdkGLContext • gdk_gl_context_realize() creates the underlying resources Calling gdk_gl_context_make_current() also realizes the context, so simple GL users do not need to care. Advanced users will want to call gdk_window_create_gl_context(), set up the optional requirements, and then call gdk_gl_context_realize(). If either of these two steps fails, it's possible to recover by changing the requirements, or simply creating a new GdkGLContext instance. https://bugzilla.gnome.org/show_bug.cgi?id=741946
2015-01-27 21:23:23 +00:00
GdkGLContext * gdk_gl_context_get_shared_context (GdkGLContext *context);
The big versioning cleanup Remove all the old 2.x and 3.x version annotations. GTK+ 4 is a new start, and from the perspective of a GTK+ 4 developer all these APIs have been around since the beginning.
2018-02-05 19:13:20 +00:00
GDK_AVAILABLE_IN_ALL
gl: Add gdk_gl_context_get_version() Store the OpenGL version when we first do the extensions check; this allows client code to check the available GL version without requiring a call to gdk_gl_context_make_current() and epoxy_gl_version().
2015-02-12 14:28:22 +00:00
void gdk_gl_context_get_version (GdkGLContext *context,
int *major,
int *minor);
The big versioning cleanup Remove all the old 2.x and 3.x version annotations. GTK+ 4 is a new start, and from the perspective of a GTK+ 4 developer all these APIs have been around since the beginning.
2018-02-05 19:13:20 +00:00
GDK_AVAILABLE_IN_ALL
gdk: Allow querying if a GL context is in legacy mode We want to have the ability to fall back to legacy GL contexts when creating them. In order to do so, we need to store the legacy bit on the GdkGLContext, as well as being able to query it. Setting the legacy bit from outside GDK is not possible; we cannot create GL contexts in 3.2 core profile *and* compatibility modes at the same time, and if we allowed users to select the legacy mode themselves, it would break the creation of the GdkWindow's paint GL context. What we do allow is falling back to legacy GL context if the platform does not support 3.2 core profiles — for instance, on older GPUs or inside virtualized environments. We are also going to use the legacy bit internally, to choose which GL API we can use when drawing GL content. https://bugzilla.gnome.org/show_bug.cgi?id=756142
2015-10-06 17:54:58 +00:00
gboolean gdk_gl_context_is_legacy (GdkGLContext *context);
gdk: Add gdk_gl_context_is_shared() ... and use it in the GL renderers.
2021-06-30 02:52:35 +00:00
GDK_AVAILABLE_IN_4_4
gboolean gdk_gl_context_is_shared (GdkGLContext *self,
GdkGLContext *other);
GL: Split GL context creation in two phases One of the major requests by OpenGL users has been the ability to specify settings when creating a GL context, like the version to use or whether the debug support should be enabled. We have a couple of requirements in terms of API: • avoid, if at all possible, the "C arrays of integers with attribute, value pairs", which are hard to write and hard to bind in non-C languages. • allow failing in a recoverable way. • do not make the GL context creation API a mess of arguments. Looking at prior art, it seems that a common pattern is to split the construction phase in two: • a first phase that creates a GL context wrapper object and does preliminary checks on the environment. • a second phase that creates the backend-specific GL object. We adopted a similar pattern: • gdk_window_create_gl_context() creates a GdkGLContext • gdk_gl_context_realize() creates the underlying resources Calling gdk_gl_context_make_current() also realizes the context, so simple GL users do not need to care. Advanced users will want to call gdk_window_create_gl_context(), set up the optional requirements, and then call gdk_gl_context_realize(). If either of these two steps fails, it's possible to recover by changing the requirements, or simply creating a new GdkGLContext instance. https://bugzilla.gnome.org/show_bug.cgi?id=741946
2015-01-27 21:23:23 +00:00
The big versioning cleanup Remove all the old 2.x and 3.x version annotations. GTK+ 4 is a new start, and from the perspective of a GTK+ 4 developer all these APIs have been around since the beginning.
2018-02-05 19:13:20 +00:00
GDK_AVAILABLE_IN_ALL
gl: Add context options Users of the GdkGLContext API should be allowed to set properties on the shim GdkGLContext instance prior to realization, so that the backend-specific implementation can use the value of those properties when creating the windowing system specific resources. The main three options are: • a major/minor version tuple, to request a specific GL version • a debug bit, to request a "debug context", which provides additional validation and run time checking • a forward compatibility bit, to request a context that does not have deprecated functionality See also: - https://www.opengl.org/registry/specs/ARB/glx_create_context.txt https://bugzilla.gnome.org/show_bug.cgi?id=741946
2015-01-28 09:34:16 +00:00
void gdk_gl_context_set_required_version (GdkGLContext *context,
int major,
int minor);
The big versioning cleanup Remove all the old 2.x and 3.x version annotations. GTK+ 4 is a new start, and from the perspective of a GTK+ 4 developer all these APIs have been around since the beginning.
2018-02-05 19:13:20 +00:00
GDK_AVAILABLE_IN_ALL
gl: Move getters for context options to the public API They can be useful for third party code as well. https://bugzilla.gnome.org/show_bug.cgi?id=741946
2015-01-28 14:37:26 +00:00
void gdk_gl_context_get_required_version (GdkGLContext *context,
int *major,
int *minor);
The big versioning cleanup Remove all the old 2.x and 3.x version annotations. GTK+ 4 is a new start, and from the perspective of a GTK+ 4 developer all these APIs have been around since the beginning.
2018-02-05 19:13:20 +00:00
GDK_AVAILABLE_IN_ALL
gl: Add context options Users of the GdkGLContext API should be allowed to set properties on the shim GdkGLContext instance prior to realization, so that the backend-specific implementation can use the value of those properties when creating the windowing system specific resources. The main three options are: • a major/minor version tuple, to request a specific GL version • a debug bit, to request a "debug context", which provides additional validation and run time checking • a forward compatibility bit, to request a context that does not have deprecated functionality See also: - https://www.opengl.org/registry/specs/ARB/glx_create_context.txt https://bugzilla.gnome.org/show_bug.cgi?id=741946
2015-01-28 09:34:16 +00:00
void gdk_gl_context_set_debug_enabled (GdkGLContext *context,
gboolean enabled);
The big versioning cleanup Remove all the old 2.x and 3.x version annotations. GTK+ 4 is a new start, and from the perspective of a GTK+ 4 developer all these APIs have been around since the beginning.
2018-02-05 19:13:20 +00:00
GDK_AVAILABLE_IN_ALL
gl: Move getters for context options to the public API They can be useful for third party code as well. https://bugzilla.gnome.org/show_bug.cgi?id=741946
2015-01-28 14:37:26 +00:00
gboolean gdk_gl_context_get_debug_enabled (GdkGLContext *context);
The big versioning cleanup Remove all the old 2.x and 3.x version annotations. GTK+ 4 is a new start, and from the perspective of a GTK+ 4 developer all these APIs have been around since the beginning.
2018-02-05 19:13:20 +00:00
GDK_AVAILABLE_IN_ALL
gl: Add context options Users of the GdkGLContext API should be allowed to set properties on the shim GdkGLContext instance prior to realization, so that the backend-specific implementation can use the value of those properties when creating the windowing system specific resources. The main three options are: • a major/minor version tuple, to request a specific GL version • a debug bit, to request a "debug context", which provides additional validation and run time checking • a forward compatibility bit, to request a context that does not have deprecated functionality See also: - https://www.opengl.org/registry/specs/ARB/glx_create_context.txt https://bugzilla.gnome.org/show_bug.cgi?id=741946
2015-01-28 09:34:16 +00:00
void gdk_gl_context_set_forward_compatible (GdkGLContext *context,
gboolean compatible);
The big versioning cleanup Remove all the old 2.x and 3.x version annotations. GTK+ 4 is a new start, and from the perspective of a GTK+ 4 developer all these APIs have been around since the beginning.
2018-02-05 19:13:20 +00:00
GDK_AVAILABLE_IN_ALL
gl: Move getters for context options to the public API They can be useful for third party code as well. https://bugzilla.gnome.org/show_bug.cgi?id=741946
2015-01-28 14:37:26 +00:00
gboolean gdk_gl_context_get_forward_compatible (GdkGLContext *context);
The big versioning cleanup Remove all the old 2.x and 3.x version annotations. GTK+ 4 is a new start, and from the perspective of a GTK+ 4 developer all these APIs have been around since the beginning.
2018-02-05 19:13:20 +00:00
GDK_AVAILABLE_IN_ALL
gl: Add 'use-es' flag On some platforms we can ask the GL context machinery to create a GLES context, instead of a GL one. In order to ask for a GLES context at GdkGLContext realization time, we use a bit field like we do for forward compatible, or debug contexts. The 'use-es' bit also changes the way we select a default version, because OpenGL and OpenGLES versions differ. https://bugzilla.gnome.org/show_bug.cgi?id=743746
2016-04-18 09:10:30 +00:00
void gdk_gl_context_set_use_es (GdkGLContext *context,
gdk/gl: Allow autodetection for GL/GLES If the GdkGLContext was not explicitly instructed to use or not GLES, we can detect whether the underlying API is going to be desktop GL or GLES. https://bugzilla.gnome.org/show_bug.cgi?id=773180
2016-10-19 12:43:17 +00:00
int use_es);
The big versioning cleanup Remove all the old 2.x and 3.x version annotations. GTK+ 4 is a new start, and from the perspective of a GTK+ 4 developer all these APIs have been around since the beginning.
2018-02-05 19:13:20 +00:00
GDK_AVAILABLE_IN_ALL
gl: Add 'use-es' flag On some platforms we can ask the GL context machinery to create a GLES context, instead of a GL one. In order to ask for a GLES context at GdkGLContext realization time, we use a bit field like we do for forward compatible, or debug contexts. The 'use-es' bit also changes the way we select a default version, because OpenGL and OpenGLES versions differ. https://bugzilla.gnome.org/show_bug.cgi?id=743746
2016-04-18 09:10:30 +00:00
gboolean gdk_gl_context_get_use_es (GdkGLContext *context);
gl: Add context options Users of the GdkGLContext API should be allowed to set properties on the shim GdkGLContext instance prior to realization, so that the backend-specific implementation can use the value of those properties when creating the windowing system specific resources. The main three options are: • a major/minor version tuple, to request a specific GL version • a debug bit, to request a "debug context", which provides additional validation and run time checking • a forward compatibility bit, to request a context that does not have deprecated functionality See also: - https://www.opengl.org/registry/specs/ARB/glx_create_context.txt https://bugzilla.gnome.org/show_bug.cgi?id=741946
2015-01-28 09:34:16 +00:00
The big versioning cleanup Remove all the old 2.x and 3.x version annotations. GTK+ 4 is a new start, and from the perspective of a GTK+ 4 developer all these APIs have been around since the beginning.
2018-02-05 19:13:20 +00:00
GDK_AVAILABLE_IN_ALL
GL: Split GL context creation in two phases One of the major requests by OpenGL users has been the ability to specify settings when creating a GL context, like the version to use or whether the debug support should be enabled. We have a couple of requirements in terms of API: • avoid, if at all possible, the "C arrays of integers with attribute, value pairs", which are hard to write and hard to bind in non-C languages. • allow failing in a recoverable way. • do not make the GL context creation API a mess of arguments. Looking at prior art, it seems that a common pattern is to split the construction phase in two: • a first phase that creates a GL context wrapper object and does preliminary checks on the environment. • a second phase that creates the backend-specific GL object. We adopted a similar pattern: • gdk_window_create_gl_context() creates a GdkGLContext • gdk_gl_context_realize() creates the underlying resources Calling gdk_gl_context_make_current() also realizes the context, so simple GL users do not need to care. Advanced users will want to call gdk_window_create_gl_context(), set up the optional requirements, and then call gdk_gl_context_realize(). If either of these two steps fails, it's possible to recover by changing the requirements, or simply creating a new GdkGLContext instance. https://bugzilla.gnome.org/show_bug.cgi?id=741946
2015-01-27 21:23:23 +00:00
gboolean gdk_gl_context_realize (GdkGLContext *context,
GError **error);
gdkgl: Add gdk_gl_context_get_damage() This is a way to query the damaged area of the backbuffer. The GL renderer uses this to compute the extents of that damage region (computed via buffer age) and use them to minimize the area to redraw. This changes the semantics of GL rendering to "When calling gdk_window_begin_frame() with a GL context, the area by gdk_gl_context_get_damage() needs to be redrawn and every other pixel of the backbuffer is guaranteed to be correct. After gdk_window_end_frame() on a GL-drawn window, the whole backbuffer must be correct. We can always glXBufferSwap() now because of this.
2016-12-04 15:33:13 +00:00
The big versioning cleanup Remove all the old 2.x and 3.x version annotations. GTK+ 4 is a new start, and from the perspective of a GTK+ 4 developer all these APIs have been around since the beginning.
2018-02-05 19:13:20 +00:00
GDK_AVAILABLE_IN_ALL
GL: Split GL context creation in two phases One of the major requests by OpenGL users has been the ability to specify settings when creating a GL context, like the version to use or whether the debug support should be enabled. We have a couple of requirements in terms of API: • avoid, if at all possible, the "C arrays of integers with attribute, value pairs", which are hard to write and hard to bind in non-C languages. • allow failing in a recoverable way. • do not make the GL context creation API a mess of arguments. Looking at prior art, it seems that a common pattern is to split the construction phase in two: • a first phase that creates a GL context wrapper object and does preliminary checks on the environment. • a second phase that creates the backend-specific GL object. We adopted a similar pattern: • gdk_window_create_gl_context() creates a GdkGLContext • gdk_gl_context_realize() creates the underlying resources Calling gdk_gl_context_make_current() also realizes the context, so simple GL users do not need to care. Advanced users will want to call gdk_window_create_gl_context(), set up the optional requirements, and then call gdk_gl_context_realize(). If either of these two steps fails, it's possible to recover by changing the requirements, or simply creating a new GdkGLContext instance. https://bugzilla.gnome.org/show_bug.cgi?id=741946
2015-01-27 21:23:23 +00:00
void gdk_gl_context_make_current (GdkGLContext *context);
The big versioning cleanup Remove all the old 2.x and 3.x version annotations. GTK+ 4 is a new start, and from the perspective of a GTK+ 4 developer all these APIs have been around since the beginning.
2018-02-05 19:13:20 +00:00
GDK_AVAILABLE_IN_ALL
GL: Split GL context creation in two phases One of the major requests by OpenGL users has been the ability to specify settings when creating a GL context, like the version to use or whether the debug support should be enabled. We have a couple of requirements in terms of API: • avoid, if at all possible, the "C arrays of integers with attribute, value pairs", which are hard to write and hard to bind in non-C languages. • allow failing in a recoverable way. • do not make the GL context creation API a mess of arguments. Looking at prior art, it seems that a common pattern is to split the construction phase in two: • a first phase that creates a GL context wrapper object and does preliminary checks on the environment. • a second phase that creates the backend-specific GL object. We adopted a similar pattern: • gdk_window_create_gl_context() creates a GdkGLContext • gdk_gl_context_realize() creates the underlying resources Calling gdk_gl_context_make_current() also realizes the context, so simple GL users do not need to care. Advanced users will want to call gdk_window_create_gl_context(), set up the optional requirements, and then call gdk_gl_context_realize(). If either of these two steps fails, it's possible to recover by changing the requirements, or simply creating a new GdkGLContext instance. https://bugzilla.gnome.org/show_bug.cgi?id=741946
2015-01-27 21:23:23 +00:00
GdkGLContext * gdk_gl_context_get_current (void);
The big versioning cleanup Remove all the old 2.x and 3.x version annotations. GTK+ 4 is a new start, and from the perspective of a GTK+ 4 developer all these APIs have been around since the beginning.
2018-02-05 19:13:20 +00:00
GDK_AVAILABLE_IN_ALL
GL: Split GL context creation in two phases One of the major requests by OpenGL users has been the ability to specify settings when creating a GL context, like the version to use or whether the debug support should be enabled. We have a couple of requirements in terms of API: • avoid, if at all possible, the "C arrays of integers with attribute, value pairs", which are hard to write and hard to bind in non-C languages. • allow failing in a recoverable way. • do not make the GL context creation API a mess of arguments. Looking at prior art, it seems that a common pattern is to split the construction phase in two: • a first phase that creates a GL context wrapper object and does preliminary checks on the environment. • a second phase that creates the backend-specific GL object. We adopted a similar pattern: • gdk_window_create_gl_context() creates a GdkGLContext • gdk_gl_context_realize() creates the underlying resources Calling gdk_gl_context_make_current() also realizes the context, so simple GL users do not need to care. Advanced users will want to call gdk_window_create_gl_context(), set up the optional requirements, and then call gdk_gl_context_realize(). If either of these two steps fails, it's possible to recover by changing the requirements, or simply creating a new GdkGLContext instance. https://bugzilla.gnome.org/show_bug.cgi?id=741946
2015-01-27 21:23:23 +00:00
void gdk_gl_context_clear_current (void);
gdk: Add support for OpenGL This adds the new type GdkGLContext that wraps an OpenGL context for a particular native window. It also adds support for the gdk paint machinery to use OpenGL to draw everything. As soon as anyone creates a GL context for a native window we create a "paint context" for that GdkWindow and switch to using GL for painting it. This commit contains only an implementation for X11 (using GLX). The way painting works is that all client gl contexts draw into offscreen buffers rather than directly to the back buffer, and the way something gets onto the window is by using gdk_cairo_draw_from_gl() to draw part of that buffer onto the draw cairo context. As a fallback (if we're doing redirected drawing or some effect like a cairo_push_group()) we read back the gl buffer into memory and composite using cairo. This means that GL rendering works in all cases, including rendering to a PDF. However, this is not particularly fast. In the *typical* case, where we're drawing directly to the window in the regular paint loop we hit the fast path. The fast path uses opengl to draw the buffer to the window back buffer, either by blitting or texturing. Then we track the region that was drawn, and when the draw ends we paint the normal cairo surface to the window (using texture-from-pixmap in the X11 case, or texture from cairo image otherwise) in the regions where there is no gl painted. There are some complexities wrt layering of gl and cairo areas though: * We track via gdk_window_mark_paint_from_clip() whenever gtk is painting over a region we previously rendered with opengl (flushed_region). This area (needs_blend_region) is blended rather than copied at the end of the frame. * If we're drawing a gl texture with alpha we first copy the current cairo_surface inside the target region to the back buffer before we blend over it. These two operations allow us full stacking of transparent gl and cairo regions.
2014-10-09 08:45:44 +00:00
G_END_DECLS
#endif /* __GDK_GL_CONTEXT_H__ */
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