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9fd9f61b00
As the alignments, strides and image formats may be different across platforms, make the texture upload a vfunc to allow backends to override the GL commands for uploading textures for the software implementation for gdk_gl_texture_from_surface(), if necessary. Suggested by Alex to avoid copying non-trivial portions of code which would then add maintainenace burden. https://bugzilla.gnome.org/show_bug.cgi?id=740795
596 lines
16 KiB
C
596 lines
16 KiB
C
/* GDK - The GIMP Drawing Kit
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*
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* gdkglcontext.c: GL context abstraction
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*
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* Copyright © 2014 Emmanuele Bassi
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* SECTION:gdkglcontext
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* @Title: GdkGLContext
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* @Short_description: OpenGL context
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*
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* #GdkGLContext is an object representing the platform-specific
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* OpenGL drawing context.
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*
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* #GdkGLContexts are created for a #GdkWindow using
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* gdk_window_create_gl_context(), and the context will match
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* the #GdkVisual of the window.
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*
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* A #GdkGLContext is not tied to any particular normal framebuffer.
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* For instance, it cannot draw to the #GdkWindow back buffer. The GDK
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* repaint system is in full control of the painting to that. Instead,
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* you can create render buffers or textures and use gdk_cairo_draw_from_gl()
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* in the draw function of your widget to draw them. Then GDK will handle
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* the integration of your rendering with that of other widgets.
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*
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* Support for #GdkGLContext is platform-specific, context creation
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* can fail, returning %NULL context.
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*
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* A #GdkGLContext has to be made "current" in order to start using
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* it, otherwise any OpenGL call will be ignored.
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*
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* ## Creating a new OpenGL context ##
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*
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* In order to create a new #GdkGLContext instance you need a
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* #GdkWindow, which you typically get during the realize call
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* of a widget.
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*
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* ## Using a GdkGLContext ##
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*
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* You will need to make the #GdkGLContext the current context
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* before issuing OpenGL calls; the system sends OpenGL commands to
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* whichever context is current. It is possible to have multiple
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* contexts, so you always need to ensure that the one which you
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* want to draw with is the current one before issuing commands:
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*
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* |[<!-- language="C" -->
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* gdk_gl_context_make_current (context);
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* ]|
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*
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* You can now perform your drawing using OpenGL commands.
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*
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* You can check which #GdkGLContext is the current one by using
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* gdk_gl_context_get_current(); you can also unset any #GdkGLContext
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* that is currently set by calling gdk_gl_context_clear_current().
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*/
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#include "config.h"
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#include "gdkglcontextprivate.h"
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#include "gdkdisplayprivate.h"
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#include "gdkinternals.h"
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#include "gdkintl.h"
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#include "gdk-private.h"
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#include <epoxy/gl.h>
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typedef struct {
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GdkDisplay *display;
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GdkWindow *window;
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GdkGLContext *shared_context;
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GdkGLProfile profile;
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guint realized : 1;
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guint use_texture_rectangle : 1;
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guint has_gl_framebuffer_blit : 1;
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guint has_frame_terminator : 1;
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GdkGLContextPaintData *paint_data;
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} GdkGLContextPrivate;
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enum {
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PROP_0,
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PROP_DISPLAY,
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PROP_WINDOW,
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PROP_PROFILE,
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PROP_SHARED_CONTEXT,
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LAST_PROP
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};
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static GParamSpec *obj_pspecs[LAST_PROP] = { NULL, };
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G_DEFINE_QUARK (gdk-gl-error-quark, gdk_gl_error)
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G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (GdkGLContext, gdk_gl_context, G_TYPE_OBJECT)
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static GPrivate thread_current_context = G_PRIVATE_INIT (g_object_unref);
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static void
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gdk_gl_context_dispose (GObject *gobject)
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{
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GdkGLContext *context = GDK_GL_CONTEXT (gobject);
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GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
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GdkGLContext *current;
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current = g_private_get (&thread_current_context);
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if (current == context)
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g_private_replace (&thread_current_context, NULL);
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g_clear_object (&priv->display);
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g_clear_object (&priv->window);
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g_clear_object (&priv->shared_context);
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G_OBJECT_CLASS (gdk_gl_context_parent_class)->dispose (gobject);
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}
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static void
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gdk_gl_context_finalize (GObject *gobject)
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{
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GdkGLContext *context = GDK_GL_CONTEXT (gobject);
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GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
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g_clear_pointer (&priv->paint_data, g_free);
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}
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static void
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gdk_gl_context_set_property (GObject *gobject,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private ((GdkGLContext *) gobject);
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switch (prop_id)
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{
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case PROP_DISPLAY:
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{
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GdkDisplay *display = g_value_get_object (value);
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if (display)
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g_object_ref (display);
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if (priv->display)
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g_object_unref (priv->display);
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priv->display = display;
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}
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break;
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case PROP_WINDOW:
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{
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GdkWindow *window = g_value_get_object (value);
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if (window)
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g_object_ref (window);
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if (priv->window)
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g_object_unref (priv->window);
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priv->window = window;
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}
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break;
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case PROP_SHARED_CONTEXT:
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{
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GdkGLContext *context = g_value_get_object (value);
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if (context != NULL)
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priv->shared_context = g_object_ref (context);
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}
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break;
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case PROP_PROFILE:
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priv->profile = g_value_get_enum (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
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}
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}
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static void
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gdk_gl_context_get_property (GObject *gobject,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private ((GdkGLContext *) gobject);
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switch (prop_id)
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{
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case PROP_DISPLAY:
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g_value_set_object (value, priv->display);
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break;
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case PROP_WINDOW:
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g_value_set_object (value, priv->window);
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break;
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case PROP_SHARED_CONTEXT:
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g_value_set_object (value, priv->shared_context);
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break;
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case PROP_PROFILE:
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g_value_set_enum (value, priv->profile);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
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}
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}
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/* Default implementation of upload_texture() for gdk_gl_texture_from_surface() */
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static void
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gdk_gl_context_upload_texture (GdkGLContext *context,
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cairo_surface_t *image_surface,
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int width,
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int height,
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guint texture_target)
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{
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g_return_if_fail (GDK_IS_GL_CONTEXT (context));
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glPixelStorei (GL_UNPACK_ALIGNMENT, 4);
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glPixelStorei (GL_UNPACK_ROW_LENGTH, cairo_image_surface_get_stride (image_surface)/4);
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glTexImage2D (texture_target, 0, 4, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV,
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cairo_image_surface_get_data (image_surface));
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glPixelStorei (GL_UNPACK_ROW_LENGTH, 0);
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}
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static void
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gdk_gl_context_class_init (GdkGLContextClass *klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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/**
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* GdkGLContext:display:
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*
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* The #GdkWindow the gl context is bound to.
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*
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* Since: 3.16
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*/
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obj_pspecs[PROP_DISPLAY] =
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g_param_spec_object ("display",
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P_("Display"),
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P_("The GDK display the context is from"),
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GDK_TYPE_DISPLAY,
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G_PARAM_READWRITE |
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G_PARAM_CONSTRUCT_ONLY |
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G_PARAM_STATIC_STRINGS);
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/**
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* GdkGLContext:window:
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*
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* The #GdkWindow the gl context is bound to.
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*
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* Since: 3.16
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*/
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obj_pspecs[PROP_WINDOW] =
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g_param_spec_object ("window",
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P_("Window"),
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P_("The GDK window bound to the GL context"),
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GDK_TYPE_WINDOW,
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G_PARAM_READWRITE |
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G_PARAM_CONSTRUCT_ONLY |
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G_PARAM_STATIC_STRINGS);
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/**
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* GdkGLContext:profile:
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*
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* The #GdkGLProfile of the context
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*
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* Since: 3.16
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*/
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obj_pspecs[PROP_PROFILE] =
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g_param_spec_enum ("profile",
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P_("Profile"),
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P_("The GL profile the context was created for"),
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GDK_TYPE_GL_PROFILE,
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GDK_GL_PROFILE_DEFAULT,
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G_PARAM_READWRITE |
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G_PARAM_CONSTRUCT_ONLY |
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G_PARAM_STATIC_STRINGS);
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/**
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* GdkGLContext:shared-context:
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*
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* The #GdkGLContext that this context is sharing data with, or #NULL
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*
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* Since: 3.16
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*/
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obj_pspecs[PROP_SHARED_CONTEXT] =
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g_param_spec_object ("shared-context",
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P_("Shared context"),
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P_("The GL context this context share data with"),
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GDK_TYPE_GL_CONTEXT,
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G_PARAM_READWRITE |
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G_PARAM_CONSTRUCT_ONLY |
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G_PARAM_STATIC_STRINGS);
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gobject_class->set_property = gdk_gl_context_set_property;
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gobject_class->get_property = gdk_gl_context_get_property;
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gobject_class->dispose = gdk_gl_context_dispose;
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gobject_class->finalize = gdk_gl_context_finalize;
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/* Default Implementation of upload_texture() for gdk_gl_texture_from_surface() */
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klass->upload_texture = gdk_gl_context_upload_texture;
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g_object_class_install_properties (gobject_class, LAST_PROP, obj_pspecs);
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}
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static void
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gdk_gl_context_init (GdkGLContext *self)
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{
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}
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/*< private >
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* gdk_gl_context_end_frame:
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* @context: a #GdkGLContext
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* @painted: The area that has been redrawn this frame
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* @damage: The area that we know is actually different from the last frame
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*
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* Copies the back buffer to the front buffer.
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*
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* This function may call `glFlush()` implicitly before returning; it
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* is not recommended to call `glFlush()` explicitly before calling
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* this function.
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*
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* Since: 3.16
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*/
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void
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gdk_gl_context_end_frame (GdkGLContext *context,
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cairo_region_t *painted,
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cairo_region_t *damage)
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{
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g_return_if_fail (GDK_IS_GL_CONTEXT (context));
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GDK_GL_CONTEXT_GET_CLASS (context)->end_frame (context, painted, damage);
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}
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GdkGLContextPaintData *
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gdk_gl_context_get_paint_data (GdkGLContext *context)
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{
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GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
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if (priv->paint_data == NULL)
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priv->paint_data = g_new0 (GdkGLContextPaintData, 1);
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return priv->paint_data;
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}
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gboolean
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gdk_gl_context_use_texture_rectangle (GdkGLContext *context)
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{
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GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
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return priv->use_texture_rectangle;
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}
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gboolean
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gdk_gl_context_has_framebuffer_blit (GdkGLContext *context)
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{
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GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
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return priv->has_gl_framebuffer_blit;
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}
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gboolean
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gdk_gl_context_has_frame_terminator (GdkGLContext *context)
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{
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GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
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return priv->has_frame_terminator;
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}
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static void
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gdk_gl_context_realize (GdkGLContext *context)
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{
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GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
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gboolean has_npot, has_texture_rectangle;
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has_npot = epoxy_has_gl_extension ("GL_ARB_texture_non_power_of_two");
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has_texture_rectangle = epoxy_has_gl_extension ("GL_ARB_texture_rectangle");
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priv->has_gl_framebuffer_blit = epoxy_has_gl_extension ("GL_EXT_framebuffer_blit");
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priv->has_frame_terminator = epoxy_has_gl_extension ("GL_GREMEDY_frame_terminator");
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if (_gdk_gl_flags & GDK_GL_TEXTURE_RECTANGLE)
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priv->use_texture_rectangle = TRUE;
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else if (has_npot)
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priv->use_texture_rectangle = FALSE;
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else if (has_texture_rectangle)
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priv->use_texture_rectangle = TRUE;
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else
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g_warning ("GL implementation doesn't support any form of non-power-of-two textures");
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priv->realized = TRUE;
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}
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/**
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* gdk_gl_context_make_current:
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* @context: a #GdkGLContext
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*
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* Makes the @context the current one.
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*
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* Since: 3.16
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*/
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void
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gdk_gl_context_make_current (GdkGLContext *context)
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{
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GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
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GdkGLContext *current;
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g_return_if_fail (GDK_IS_GL_CONTEXT (context));
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current = g_private_get (&thread_current_context);
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if (current == context)
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return;
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if (gdk_display_make_gl_context_current (priv->display, context))
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{
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g_private_replace (&thread_current_context, g_object_ref (context));
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if (!priv->realized)
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gdk_gl_context_realize (context);
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}
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}
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/**
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* gdk_gl_context_get_display:
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* @context: a #GdkGLContext
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*
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* Retrieves the #GdkDisplay the @context is created for
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*
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* Returns: (transfer none): a #GdkDisplay or %NULL
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*
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* Since: 3.16
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*/
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GdkDisplay *
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gdk_gl_context_get_display (GdkGLContext *context)
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{
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GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
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g_return_val_if_fail (GDK_IS_GL_CONTEXT (context), NULL);
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return priv->display;
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}
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/**
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* gdk_gl_context_get_window:
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* @context: a #GdkGLContext
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*
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* Retrieves the #GdkWindow used by the @context.
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*
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* Returns: (transfer none): a #GdkWindow or %NULL
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*
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* Since: 3.16
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*/
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GdkWindow *
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gdk_gl_context_get_window (GdkGLContext *context)
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{
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GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
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g_return_val_if_fail (GDK_IS_GL_CONTEXT (context), NULL);
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return priv->window;
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}
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/**
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* gdk_gl_context_get_profile:
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* @context: a #GdkGLContext
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*
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* Retrieves the #GdkGLProfile that @context was created for.
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*
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* Returns: a #GdkGLProfile
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*
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* Since: 3.16
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*/
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GdkGLProfile
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gdk_gl_context_get_profile (GdkGLContext *context)
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{
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GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
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g_return_val_if_fail (GDK_IS_GL_CONTEXT (context), GDK_GL_PROFILE_LEGACY);
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return priv->profile;
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}
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/**
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* gdk_gl_context_get_shared_context:
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* @context: a #GdkGLContext
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*
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* Retrieves the #GdkGLContext that this @context share data with.
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*
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* Returns: (transfer none): a #GdkGLContext or %NULL
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*
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* Since: 3.16
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*/
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GdkGLContext *
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gdk_gl_context_get_shared_context (GdkGLContext *context)
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{
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GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
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g_return_val_if_fail (GDK_IS_GL_CONTEXT (context), NULL);
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|
|
return priv->shared_context;
|
|
}
|
|
|
|
/**
|
|
* gdk_gl_context_clear_current:
|
|
*
|
|
* Clears the current #GdkGLContext.
|
|
*
|
|
* Any OpenGL call after this function returns will be ignored
|
|
* until gdk_gl_context_make_current() is called.
|
|
*
|
|
* Since: 3.16
|
|
*/
|
|
void
|
|
gdk_gl_context_clear_current (void)
|
|
{
|
|
GdkGLContext *current;
|
|
|
|
current = g_private_get (&thread_current_context);
|
|
if (current != NULL)
|
|
{
|
|
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (current);
|
|
|
|
if (gdk_display_make_gl_context_current (priv->display, NULL))
|
|
g_private_replace (&thread_current_context, NULL);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gdk_gl_context_get_current:
|
|
*
|
|
* Retrieves the current #GdkGLContext.
|
|
*
|
|
* Returns: (transfer none): the current #GdkGLContext, or %NULL
|
|
*
|
|
* Since: 3.16
|
|
*/
|
|
GdkGLContext *
|
|
gdk_gl_context_get_current (void)
|
|
{
|
|
GdkGLContext *current;
|
|
|
|
current = g_private_get (&thread_current_context);
|
|
|
|
return current;
|
|
}
|
|
|
|
/**
|
|
* gdk_gl_get_flags:
|
|
*
|
|
* Returns the currently active GL flags.
|
|
*
|
|
* Returns: the GL flags
|
|
*
|
|
* Since: 3.16
|
|
*/
|
|
GdkGLFlags
|
|
gdk_gl_get_flags (void)
|
|
{
|
|
return _gdk_gl_flags;
|
|
}
|
|
|
|
/**
|
|
* gdk_gl_set_flags:
|
|
* @flags: #GdkGLFlags to set
|
|
*
|
|
* Sets GL flags.
|
|
*
|
|
* Since: 3.16
|
|
*/
|
|
void
|
|
gdk_gl_set_flags (GdkGLFlags flags)
|
|
{
|
|
_gdk_gl_flags = flags;
|
|
}
|