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gtk2/gtk/gtkglarea.c
Niels Nesse 27cf0fa34c Fix core context creation in GdkGLContext 
- Specifically request GL version when creating context. Just specifying core
profile bit results in the requested version defaulting to 1.0 which causes
the core profile bit to be ignored and an arbitrary compatability context to be
returned.

- Fix GL painting by removing GL calls that have been depricated by the 3.2 core
profile.

- Additionally remove glInvalidateFramebuffer() call, it is not supported by 3.2
core.

https://bugzilla.gnome.org/show_bug.cgi?id=742953
2015-01-28 12:00:30 +00:00

1352 lines
37 KiB
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/* GTK - The GIMP Toolkit
*
* gtkglarea.c: A GL drawing area
*
* Copyright © 2014 Emmanuele Bassi
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "config.h"
#include "gtkglarea.h"
#include "gtkintl.h"
#include "gtkstylecontext.h"
#include "gtkmarshalers.h"
#include "gtkprivate.h"
#include "gtkrender.h"
#include <epoxy/gl.h>
/**
* SECTION:gtkglarea
* @Title: GtkGLArea
* @Short_description: A widget for custom drawing with OpenGL
*
* #GtkGLArea is a widget that allows drawing with OpenGL.
*
* #GtkGLArea sets up its own #GdkGLContext for the window it creates, and
* creates a custom GL framebuffer that the widget will do GL rendering onto.
* It also ensures that this framebuffer is the default GL rendering target
* when rendering.
*
* In order to draw, you have to connect to the #GtkGLArea::render signal,
* or subclass #GtkGLArea and override the @GtkGLAreaClass.render() virtual
* function.
*
* The #GtkGLArea widget ensures that the #GdkGLContext is associated with
* the widget's drawing area, and it is kept updated when the size and
* position of the drawing area changes.
*
* ## Drawing with GtkGLArea ##
*
* The simplest way to draw using OpenGL commands in a #GtkGLArea is to
* create a widget instance and connect to the #GtkGLArea::render signal:
*
* |[<!-- language="C" -->
* // create a GtkGLArea instance
* GtkWidget *gl_area = gtk_gl_area_new ();
*
* // connect to the "render" signal
* g_signal_connect (gl_area, "render", G_CALLBACK (render), NULL);
* ]|
*
* The `render()` function will be called when the #GtkGLArea is ready
* for you to draw its content:
*
* |[<!-- language="C" -->
* static gboolean
* render (GtkGLArea *area, GdkGLContext *context)
* {
* // inside this function it's safe to use GL; the given
* // #GdkGLContext has been made current to the drawable
* // surface used by the #GtkGLArea and the viewport has
* // already been set to be the size of the allocation
*
* // we can start by clearing the buffer
* glClearColor (0, 0, 0, 0);
* glClear (GL_COLOR_BUFFER_BIT);
*
* // draw your object
* draw_an_object ();
*
* // we completed our drawing; the draw commands will be
* // flushed at the end of the signal emission chain, and
* // the buffers will be drawn on the window
* return TRUE;
* }
* ]|
*
* The `draw_an_object()` function draws a 2D, gold-colored
* triangle:
*
* |[<!-- language="C" -->
* static void
* draw_an_object (void)
* {
* // set the color
* glColor3f (1.0f, 0.85f, 0.35f);
*
* // draw our triangle
* glBegin (GL_TRIANGLES);
* {
* glVertex3f ( 0.0f, 0.6f, 0.0f);
* glVertex3f (-0.2f, -0.3f, 0.0f);
* glVertex3f ( 0.2f, -0.3f, 0.0f);
* }
* glEnd ();
* }
* ]|
*
* This is an extremely simple example; in a real-world application you
* would probably replace the immediate mode drawing with persistent
* geometry primitives, like a Vertex Buffer Object, and only redraw what
* changed in your scene.
*
*/
typedef struct {
GdkGLProfile profile;
GdkGLContext *context;
GdkWindow *event_window;
GError *error;
gboolean have_buffers;
guint frame_buffer;
guint render_buffer;
guint texture;
guint depth_stencil_buffer;
gboolean has_alpha;
gboolean has_depth_buffer;
gboolean has_stencil_buffer;
gboolean needs_resize;
gboolean needs_render;
gboolean auto_render;
} GtkGLAreaPrivate;
enum {
PROP_0,
PROP_CONTEXT,
PROP_PROFILE,
PROP_HAS_ALPHA,
PROP_HAS_DEPTH_BUFFER,
PROP_HAS_STENCIL_BUFFER,
PROP_AUTO_RENDER,
LAST_PROP
};
static GParamSpec *obj_props[LAST_PROP] = { NULL, };
enum {
RENDER,
RESIZE,
CREATE_CONTEXT,
LAST_SIGNAL
};
static void gtk_gl_area_allocate_buffers (GtkGLArea *area);
static guint area_signals[LAST_SIGNAL] = { 0, };
G_DEFINE_TYPE_WITH_PRIVATE (GtkGLArea, gtk_gl_area, GTK_TYPE_WIDGET)
static void
gtk_gl_area_dispose (GObject *gobject)
{
GtkGLArea *area = GTK_GL_AREA (gobject);
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
g_clear_object (&priv->context);
G_OBJECT_CLASS (gtk_gl_area_parent_class)->dispose (gobject);
}
static void
gtk_gl_area_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
switch (prop_id)
{
case PROP_AUTO_RENDER:
gtk_gl_area_set_auto_render (GTK_GL_AREA(gobject),
g_value_get_boolean (value));
break;
case PROP_HAS_ALPHA:
gtk_gl_area_set_has_alpha (GTK_GL_AREA(gobject),
g_value_get_boolean (value));
break;
case PROP_HAS_DEPTH_BUFFER:
gtk_gl_area_set_has_depth_buffer (GTK_GL_AREA(gobject),
g_value_get_boolean (value));
break;
case PROP_HAS_STENCIL_BUFFER:
gtk_gl_area_set_has_stencil_buffer (GTK_GL_AREA(gobject),
g_value_get_boolean (value));
break;
case PROP_PROFILE:
gtk_gl_area_set_profile (GTK_GL_AREA(gobject),
g_value_get_enum (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
}
}
static void
gtk_gl_area_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (GTK_GL_AREA (gobject));
switch (prop_id)
{
case PROP_AUTO_RENDER:
g_value_set_boolean (value, priv->auto_render);
break;
case PROP_HAS_ALPHA:
g_value_set_boolean (value, priv->has_alpha);
break;
case PROP_HAS_DEPTH_BUFFER:
g_value_set_boolean (value, priv->has_depth_buffer);
break;
case PROP_HAS_STENCIL_BUFFER:
g_value_set_boolean (value, priv->has_stencil_buffer);
break;
case PROP_CONTEXT:
g_value_set_object (value, priv->context);
break;
case PROP_PROFILE:
g_value_set_enum (value, priv->profile);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
}
}
static void
gtk_gl_area_realize (GtkWidget *widget)
{
GtkGLArea *area = GTK_GL_AREA (widget);
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
GtkAllocation allocation;
GdkWindowAttr attributes;
gint attributes_mask;
GTK_WIDGET_CLASS (gtk_gl_area_parent_class)->realize (widget);
gtk_widget_get_allocation (widget, &allocation);
attributes.window_type = GDK_WINDOW_CHILD;
attributes.x = allocation.x;
attributes.y = allocation.y;
attributes.width = allocation.width;
attributes.height = allocation.height;
attributes.wclass = GDK_INPUT_ONLY;
attributes.event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
attributes_mask = GDK_WA_X | GDK_WA_Y;
priv->event_window = gdk_window_new (gtk_widget_get_parent_window (widget),
&attributes, attributes_mask);
gtk_widget_register_window (widget, priv->event_window);
g_clear_error (&priv->error);
priv->context = NULL;
g_signal_emit (area, area_signals[CREATE_CONTEXT], 0, &priv->context);
/* In case the signal failed, but did not set an error */
if (priv->context == NULL && priv->error == NULL)
g_set_error_literal (&priv->error, GDK_GL_ERROR,
GDK_GL_ERROR_NOT_AVAILABLE,
_("OpenGL context creation failed"));
priv->needs_resize = TRUE;
}
static void
gtk_gl_area_notify (GObject *object,
GParamSpec *pspec)
{
if (strcmp (pspec->name, "scale-factor") == 0)
{
GtkGLArea *area = GTK_GL_AREA (object);
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
priv->needs_resize = TRUE;
}
if (G_OBJECT_CLASS (gtk_gl_area_parent_class)->notify)
G_OBJECT_CLASS (gtk_gl_area_parent_class)->notify (object, pspec);
}
static GdkGLContext *
gtk_gl_area_real_create_context (GtkGLArea *area)
{
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
GtkWidget *widget = GTK_WIDGET (area);
GError *error = NULL;
GdkGLContext *context;
context = gdk_window_create_gl_context (gtk_widget_get_window (widget), priv->profile, &priv->error);
gtk_gl_area_set_error (area, error);
return context;
}
static void
gtk_gl_area_resize (GtkGLArea *area, int width, int height)
{
glViewport (0, 0, width, height);
}
/*
* Creates all the buffer objects needed for rendering the scene
*/
static void
gtk_gl_area_ensure_buffers (GtkGLArea *area)
{
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
GtkWidget *widget = GTK_WIDGET (area);
gtk_widget_realize (widget);
if (priv->context == NULL)
return;
if (priv->have_buffers)
return;
priv->have_buffers = TRUE;
glGenFramebuffersEXT (1, &priv->frame_buffer);
if (priv->has_alpha)
{
/* For alpha we use textures as that is required for blending to work */
if (priv->texture == 0)
glGenTextures (1, &priv->texture);
/* Delete old render buffer if any */
if (priv->render_buffer != 0)
{
glDeleteRenderbuffersEXT(1, &priv->render_buffer);
priv->render_buffer = 0;
}
}
else
{
/* For non-alpha we use render buffers so we can blit instead of texture the result */
if (priv->render_buffer == 0)
glGenRenderbuffersEXT (1, &priv->render_buffer);
/* Delete old texture if any */
if (priv->texture != 0)
{
glDeleteTextures(1, &priv->texture);
priv->texture = 0;
}
}
if ((priv->has_depth_buffer || priv->has_stencil_buffer))
{
if (priv->depth_stencil_buffer == 0)
glGenRenderbuffersEXT (1, &priv->depth_stencil_buffer);
}
else if (priv->depth_stencil_buffer != 0)
{
/* Delete old depth/stencil buffer */
glDeleteRenderbuffersEXT (1, &priv->depth_stencil_buffer);
priv->depth_stencil_buffer = 0;
}
gtk_gl_area_allocate_buffers (area);
}
/*
* Allocates space of the right type and size for all the buffers
*/
static void
gtk_gl_area_allocate_buffers (GtkGLArea *area)
{
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
GtkWidget *widget = GTK_WIDGET (area);
int scale, width, height;
if (priv->context == NULL)
return;
scale = gtk_widget_get_scale_factor (widget);
width = gtk_widget_get_allocated_width (widget) * scale;
height = gtk_widget_get_allocated_height (widget) * scale;
if (priv->texture)
{
glBindTexture (GL_TEXTURE_2D, priv->texture);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_BGRA, GL_UNSIGNED_BYTE, NULL);
}
if (priv->render_buffer)
{
glBindRenderbufferEXT (GL_RENDERBUFFER_EXT, priv->render_buffer);
glRenderbufferStorageEXT (GL_RENDERBUFFER_EXT, GL_RGB8, width, height);
}
if (priv->has_depth_buffer || priv->has_stencil_buffer)
{
glBindRenderbufferEXT (GL_RENDERBUFFER_EXT, priv->depth_stencil_buffer);
if (priv->has_stencil_buffer)
glRenderbufferStorageEXT (GL_RENDERBUFFER_EXT, GL_DEPTH24_STENCIL8_EXT, width, height);
else
glRenderbufferStorageEXT (GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT24, width, height);
}
priv->needs_render = TRUE;
}
/**
* gtk_gl_area_attach_buffers:
* @area: a #GtkGLArea
*
* Ensures that the @area framebuffer object is made the current draw
* and read target, and that all the required buffers for the @area
* are created and bound to the frambuffer.
*
* This function is automatically called before emitting the
* #GtkGLArea::render signal, and doesn't normally need to be called
* by application code.
*
* Since: 3.16
*/
void
gtk_gl_area_attach_buffers (GtkGLArea *area)
{
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
gtk_gl_area_make_current (area);
if (!priv->have_buffers)
gtk_gl_area_ensure_buffers (area);
else if (priv->needs_resize)
gtk_gl_area_allocate_buffers (area);
glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, priv->frame_buffer);
if (priv->texture)
glFramebufferTexture2D (GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
GL_TEXTURE_2D, priv->texture, 0);
else if (priv->render_buffer)
glFramebufferRenderbufferEXT (GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
GL_RENDERBUFFER_EXT, priv->render_buffer);
if (priv->depth_stencil_buffer)
{
if (priv->has_depth_buffer)
glFramebufferRenderbufferEXT (GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
GL_RENDERBUFFER_EXT, priv->depth_stencil_buffer);
if (priv->has_stencil_buffer)
glFramebufferRenderbufferEXT (GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT,
GL_RENDERBUFFER_EXT, priv->depth_stencil_buffer);
}
}
static void
gtk_gl_area_delete_buffers (GtkGLArea *area)
{
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
if (priv->context == NULL)
return;
priv->have_buffers = FALSE;
if (priv->render_buffer != 0)
{
glDeleteRenderbuffersEXT (1, &priv->render_buffer);
priv->render_buffer = 0;
}
if (priv->texture != 0)
{
glDeleteTextures(1, &priv->texture);
priv->texture = 0;
}
if (priv->depth_stencil_buffer != 0)
{
glDeleteRenderbuffersEXT (1, &priv->depth_stencil_buffer);
priv->depth_stencil_buffer = 0;
}
if (priv->frame_buffer != 0)
{
glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, 0);
glDeleteFramebuffersEXT (1, &priv->frame_buffer);
priv->frame_buffer = 0;
}
}
static void
gtk_gl_area_post_render (GtkGLArea *area)
{
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
GLenum invalidate[4];
int i = 0;
if (priv->has_depth_buffer)
invalidate[i++] = GL_DEPTH_ATTACHMENT;
if (priv->has_stencil_buffer)
invalidate[i++] = GL_STENCIL_ATTACHMENT;
if (priv->auto_render)
invalidate[i++] = GL_COLOR_ATTACHMENT0;
}
static void
gtk_gl_area_unrealize (GtkWidget *widget)
{
GtkGLArea *area = GTK_GL_AREA (widget);
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
if (priv->context != NULL)
{
if (priv->have_buffers)
{
gtk_gl_area_make_current (area);
gtk_gl_area_delete_buffers (area);
}
/* Make sure to destroy if current */
if (priv->context == gdk_gl_context_get_current ())
gdk_gl_context_clear_current ();
g_object_unref (priv->context);
priv->context = NULL;
}
g_clear_error (&priv->error);
if (priv->event_window != NULL)
{
gtk_widget_unregister_window (widget, priv->event_window);
gdk_window_destroy (priv->event_window);
priv->event_window = NULL;
}
GTK_WIDGET_CLASS (gtk_gl_area_parent_class)->unrealize (widget);
}
static void
gtk_gl_area_map (GtkWidget *widget)
{
GtkGLArea *area = GTK_GL_AREA (widget);
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
if (priv->event_window != NULL)
gdk_window_show (priv->event_window);
GTK_WIDGET_CLASS (gtk_gl_area_parent_class)->map (widget);
}
static void
gtk_gl_area_unmap (GtkWidget *widget)
{
GtkGLArea *area = GTK_GL_AREA (widget);
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
if (priv->event_window != NULL)
gdk_window_hide (priv->event_window);
GTK_WIDGET_CLASS (gtk_gl_area_parent_class)->unmap (widget);
}
static void
gtk_gl_area_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkGLArea *area = GTK_GL_AREA (widget);
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
GTK_WIDGET_CLASS (gtk_gl_area_parent_class)->size_allocate (widget, allocation);
if (gtk_widget_get_realized (widget))
{
if (priv->event_window != NULL)
gdk_window_move_resize (priv->event_window,
allocation->x,
allocation->y,
allocation->width,
allocation->height);
priv->needs_resize = TRUE;
}
}
static void
gtk_gl_area_draw_error_screen (GtkGLArea *area,
cairo_t *cr,
gint width,
gint height)
{
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
PangoLayout *layout;
int layout_height;
layout = gtk_widget_create_pango_layout (GTK_WIDGET (area),
priv->error->message);
pango_layout_set_width (layout, width * PANGO_SCALE);
pango_layout_set_alignment (layout, PANGO_ALIGN_CENTER);
pango_layout_get_pixel_size (layout, NULL, &layout_height);
gtk_render_layout (gtk_widget_get_style_context (GTK_WIDGET (area)),
cr,
0, (height - layout_height) / 2,
layout);
g_object_unref (layout);
}
static gboolean
gtk_gl_area_draw (GtkWidget *widget,
cairo_t *cr)
{
GtkGLArea *area = GTK_GL_AREA (widget);
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
gboolean unused;
int w, h, scale;
GLenum status;
if (priv->context == NULL)
{
gtk_gl_area_draw_error_screen (area,
cr,
gtk_widget_get_allocated_width (widget),
gtk_widget_get_allocated_height (widget));
return FALSE;
}
gtk_gl_area_make_current (area);
gtk_gl_area_attach_buffers (area);
if (priv->has_depth_buffer)
glEnable (GL_DEPTH_TEST);
else
glDisable (GL_DEPTH_TEST);
scale = gtk_widget_get_scale_factor (widget);
w = gtk_widget_get_allocated_width (widget) * scale;
h = gtk_widget_get_allocated_height (widget) * scale;
status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
if (status == GL_FRAMEBUFFER_COMPLETE_EXT)
{
if (priv->needs_render || priv->auto_render)
{
if (priv->needs_resize)
{
g_signal_emit (area, area_signals[RESIZE], 0, w, h, NULL);
priv->needs_resize = FALSE;
}
g_signal_emit (area, area_signals[RENDER], 0, priv->context, &unused);
}
priv->needs_render = FALSE;
gdk_cairo_draw_from_gl (cr,
gtk_widget_get_window (widget),
priv->texture ? priv->texture : priv->render_buffer,
priv->texture ? GL_TEXTURE : GL_RENDERBUFFER,
scale, 0, 0, w, h);
gtk_gl_area_make_current (area);
gtk_gl_area_post_render (area);
}
else
{
g_print ("fb setup not supported\n");
}
return TRUE;
}
static gboolean
create_context_accumulator (GSignalInvocationHint *ihint,
GValue *return_accu,
const GValue *handler_return,
gpointer data)
{
g_value_copy (handler_return, return_accu);
/* stop after the first handler returning a valid object */
return g_value_get_object (handler_return) == NULL;
}
static void
gtk_gl_area_class_init (GtkGLAreaClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
klass->resize = gtk_gl_area_resize;
klass->create_context = gtk_gl_area_real_create_context;
widget_class->realize = gtk_gl_area_realize;
widget_class->unrealize = gtk_gl_area_unrealize;
widget_class->map = gtk_gl_area_map;
widget_class->unmap = gtk_gl_area_unmap;
widget_class->size_allocate = gtk_gl_area_size_allocate;
widget_class->draw = gtk_gl_area_draw;
gtk_widget_class_set_accessible_role (widget_class, ATK_ROLE_DRAWING_AREA);
/**
* GtkGLArea:context:
*
* The #GdkGLContext used by the #GtkGLArea widget.
*
* The #GtkGLArea widget is responsible for creating the #GdkGLContext
* instance. If you need to render with other kinds of buffers (stencil,
* depth, etc), use render buffers.
*
* Since: 3.16
*/
obj_props[PROP_CONTEXT] =
g_param_spec_object ("context",
P_("Context"),
P_("The GL context"),
GDK_TYPE_GL_CONTEXT,
G_PARAM_READABLE |
G_PARAM_STATIC_STRINGS);
/**
* GdkGLArea:profile:
*
* The #GdkGLProfile to use to create the GL context for the area.
*
* Since: 3.16
*/
obj_props[PROP_PROFILE] =
g_param_spec_enum ("profile",
P_("Profile"),
P_("The GL profile to use for the GL context"),
GDK_TYPE_GL_PROFILE,
GDK_GL_PROFILE_DEFAULT,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT |
G_PARAM_EXPLICIT_NOTIFY |
G_PARAM_STATIC_STRINGS);
/**
* GtkGLArea:auto-render:
*
* If set to %TRUE the #GtkGLArea::render signal will be emitted every time
* the widget draws. This is the default and is useful if drawing the widget
* is faster.
*
* If set to %FALSE the data from previous rendering is kept around and will
* be used for drawing the widget the next time, unless the window is resized.
* In order to force a rendering gtk_gl_area_queue_render() must be called.
* This mode is useful when the scene changes seldomly, but takes a long time
* to redraw.
*
* Since: 3.16
*/
obj_props[PROP_AUTO_RENDER] =
g_param_spec_boolean ("auto-render",
P_("Auto render"),
P_("Whether the gl area renders on each redraw"),
TRUE,
GTK_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS |
G_PARAM_EXPLICIT_NOTIFY);
/**
* GtkGLArea:has-alpha:
*
* If set to %TRUE the buffer allocated by the widget will have an alpha channel
* component, and when rendering to the window the result will be composited over
* whatever is below the widget.
*
* If set to %FALSE there will be no alpha channel, and the buffer will fully
* replace anything below the widget.
*
* Since: 3.16
*/
obj_props[PROP_HAS_ALPHA] =
g_param_spec_boolean ("has-alpha",
P_("Has alpha"),
P_("Whether the gl area color buffer has an alpha component"),
FALSE,
GTK_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS |
G_PARAM_EXPLICIT_NOTIFY);
/**
* GtkGLArea:has-depth-buffer:
*
* If set to %TRUE the widget will allocate and enable a depth buffer for the
* target framebuffer.
*
* Since: 3.16
*/
obj_props[PROP_HAS_DEPTH_BUFFER] =
g_param_spec_boolean ("has-depth-buffer",
P_("Has depth buffer"),
P_("Whether a depth buffer is allocated"),
FALSE,
GTK_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS |
G_PARAM_EXPLICIT_NOTIFY);
/**
* GtkGLArea:has-stencil-buffer:
*
* If set to %TRUE the widget will allocate and enable a stencil buffer for the
* target framebuffer.
*
* Since: 3.16
*/
obj_props[PROP_HAS_STENCIL_BUFFER] =
g_param_spec_boolean ("has-stencil-buffer",
P_("Has stencil buffer"),
P_("Whether a stencil buffer is allocated"),
FALSE,
GTK_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS |
G_PARAM_EXPLICIT_NOTIFY);
gobject_class->set_property = gtk_gl_area_set_property;
gobject_class->get_property = gtk_gl_area_get_property;
gobject_class->dispose = gtk_gl_area_dispose;
gobject_class->notify = gtk_gl_area_notify;
g_object_class_install_properties (gobject_class, LAST_PROP, obj_props);
/**
* GtkGLArea::render:
* @area: the #GtkGLArea that emitted the signal
* @context: the #GdkGLContext used by @area
*
* The ::render signal is emitted every time the contents
* of the #GtkGLArea should be redrawn.
*
* The @context is bound to the @area prior to emitting this function,
* and the buffers are painted to the window once the emission terminates.
*
* Returns: %TRUE to stop other handlers from being invoked for the event.
* %FALSE to propagate the event further.
*
* Since: 3.16
*/
area_signals[RENDER] =
g_signal_new (I_("render"),
G_TYPE_FROM_CLASS (gobject_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkGLAreaClass, render),
_gtk_boolean_handled_accumulator, NULL,
NULL,
G_TYPE_BOOLEAN, 1,
GDK_TYPE_GL_CONTEXT);
/**
* GtkGLArea::resized:
* @area: the #GtkGLArea that emitted the signal
*
* The ::resized signal is emitted once when the widget is realized, and
* then each time the widget is changed while realized. This is useful
* in order to keep GL state up to date with the widget size, like for
* instance camera properties which may depend on the width/height ratio.
*
* The GL context for the area is guaranteed to be current when this signal
* is emitted.
*
* The default handler sets up the GL viewport.
*
* Since: 3.16
*/
area_signals[RESIZE] =
g_signal_new ("resize",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkGLAreaClass, resize),
NULL, NULL,
_gtk_marshal_VOID__INT_INT,
G_TYPE_NONE, 2, G_TYPE_INT, G_TYPE_INT);
/**
* GtkGLArea::create-context:
* @area: the #GtkGLArea that emitted the signal
* @error: (allow-none): location to store error information on failure
*
* The ::create-context signal is emitted when the widget is being
* realized, and allows you to override how the GL context is
* created. This is useful when you want to reuse an existing GL
* context, or if you want to try creating different kinds of GL
* profiles.
*
* If context creation fails then the signal handler can use
* gtk_gl_area_set_error() to register a more detailed error
* of how the construction failed.
*
* Returns: (transfer full): a newly created #GdkGLContext;
* the #GtkGLArea widget will take ownership of the returned value.
*
* Since: 3.16
*/
area_signals[CREATE_CONTEXT] =
g_signal_new ("create-context",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkGLAreaClass, create_context),
create_context_accumulator, NULL,
_gtk_marshal_OBJECT__VOID,
GDK_TYPE_GL_CONTEXT, 0);
}
static void
gtk_gl_area_init (GtkGLArea *area)
{
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
gtk_widget_set_has_window (GTK_WIDGET (area), FALSE);
gtk_widget_set_app_paintable (GTK_WIDGET (area), TRUE);
priv->profile = GDK_GL_PROFILE_DEFAULT;
priv->auto_render = TRUE;
priv->needs_render = TRUE;
}
/**
* gtk_gl_area_new:
*
* Creates a new #GtkGLArea widget.
*
* Returns: (transfer full): the newly created #GtkGLArea
*
* Since: 3.16
*/
GtkWidget *
gtk_gl_area_new (void)
{
return g_object_new (GTK_TYPE_GL_AREA, NULL);
}
/**
* gtk_gl_area_set_error:
* @area: a #GtkGLArea
* @error: (allow-none): a new #GError, or %NULL to unset the error
*
* Sets an error on the area which will be shown instead of the
* GL rendering. This is useful in the #GtkGLArea::create-context
* signal if GL context creation fails.
*
* Since: 3.16
*/
void
gtk_gl_area_set_error (GtkGLArea *area,
const GError *error)
{
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
g_return_if_fail (GTK_IS_GL_AREA (area));
g_clear_error (&priv->error);
if (error)
priv->error = g_error_copy (error);
}
/**
* gtk_gl_area_get_error:
* @area: a #GtkGLArea
*
* Gets the current error set on the @area.
*
* Returns: (transfer none): the #GError or %NULL
*
* Since: 3.16
*/
GError *
gtk_gl_area_get_error (GtkGLArea *area)
{
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
g_return_val_if_fail (GTK_IS_GL_AREA (area), NULL);
return priv->error;
}
/**
* gtk_gl_area_get_profile:
* @area: a #GtkGLArea
*
* Returns the profile that will be used to create the GL context for the area.
*
* Returns: a #GdkGLProfile
*
* Since: 3.16
*/
GdkGLProfile
gtk_gl_area_get_profile (GtkGLArea *area)
{
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
g_return_val_if_fail (GTK_IS_GL_AREA (area), FALSE);
return priv->profile;
}
/**
* gtk_gl_area_set_profile:
* @area: a #GtkGLArea
* @profile: a #GdkGLProfile
*
* Sets the profile type to be used when creating the context for the widget.
* This must be called before the are has been realized.
*
* Since: 3.16
*/
void
gtk_gl_area_set_profile (GtkGLArea *area,
GdkGLProfile profile)
{
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
g_return_if_fail (GTK_IS_GL_AREA (area));
if (priv->profile != profile)
{
priv->profile = profile;
g_object_notify (G_OBJECT (area), "profile");
}
}
/**
* gtk_gl_area_get_has_alpha:
* @area: a #GtkGLArea
*
* Returns whether the area has an alpha component.
*
* Returns: %TRUE if the @area has an alpha component, %FALSE otherwise
*
* Since: 3.16
*/
gboolean
gtk_gl_area_get_has_alpha (GtkGLArea *area)
{
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
g_return_val_if_fail (GTK_IS_GL_AREA (area), FALSE);
return priv->has_alpha;
}
/**
* gtk_gl_area_set_has_alpha:
* @area: a #GtkGLArea
* @has_alpha: %TRUE to add an alpha component
*
* If @has_alpha is %TRUE the buffer allocated by the widget will have
* an alpha channel component, and when rendering to the window the
* result will be composited over whatever is below the widget.
*
* If @has_alpha is %FALSE there will be no alpha channel, and the
* buffer will fully replace anything below the widget.
*
* Since: 3.16
*/
void
gtk_gl_area_set_has_alpha (GtkGLArea *area,
gboolean has_alpha)
{
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
g_return_if_fail (GTK_IS_GL_AREA (area));
has_alpha = !!has_alpha;
if (priv->has_alpha != has_alpha)
{
priv->has_alpha = has_alpha;
g_object_notify (G_OBJECT (area), "has-alpha");
gtk_gl_area_delete_buffers (area);
}
}
/**
* gtk_gl_area_get_has_depth_buffer:
* @area: a #GtkGLArea
*
* Returns whether the area has a depth buffer.
*
* Returns: %TRUE if the @area has a depth buffer, %FALSE otherwise
*
* Since: 3.16
*/
gboolean
gtk_gl_area_get_has_depth_buffer (GtkGLArea *area)
{
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
g_return_val_if_fail (GTK_IS_GL_AREA (area), FALSE);
return priv->has_depth_buffer;
}
/**
* gtk_gl_area_set_has_depth_buffer:
* @area: a #GtkGLArea
* @has_depth_buffer: %TRUE to add a depth buffer
*
* If @has_depth_buffer is %TRUE the widget will allocate and
* enable a depth buffer for the target framebuffer. Otherwise
* there will be none.
*
* Since: 3.16
*/
void
gtk_gl_area_set_has_depth_buffer (GtkGLArea *area,
gboolean has_depth_buffer)
{
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
g_return_if_fail (GTK_IS_GL_AREA (area));
has_depth_buffer = !!has_depth_buffer;
if (priv->has_depth_buffer != has_depth_buffer)
{
priv->has_depth_buffer = has_depth_buffer;
g_object_notify (G_OBJECT (area), "has-depth-buffer");
priv->have_buffers = FALSE;
}
}
/**
* gtk_gl_area_get_has_stencil_buffer:
* @area: a #GtkGLArea
*
* Returns whether the area has a stencil buffer.
*
* Returns: %TRUE if the @area has a stencil buffer, %FALSE otherwise
*
* Since: 3.16
*/
gboolean
gtk_gl_area_get_has_stencil_buffer (GtkGLArea *area)
{
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
g_return_val_if_fail (GTK_IS_GL_AREA (area), FALSE);
return priv->has_stencil_buffer;
}
/**
* gtk_gl_area_set_has_stencil_buffer:
* @area: a #GtkGLArea
* @has_stencil_buffer: %TRUE to add a stencil buffer
*
* If @has_stencil_buffer is %TRUE the widget will allocate and
* enable a stencil buffer for the target framebuffer. Otherwise
* there will be none.
*
* Since: 3.16
*/
void
gtk_gl_area_set_has_stencil_buffer (GtkGLArea *area,
gboolean has_stencil_buffer)
{
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
g_return_if_fail (GTK_IS_GL_AREA (area));
has_stencil_buffer = !!has_stencil_buffer;
if (priv->has_stencil_buffer != has_stencil_buffer)
{
priv->has_stencil_buffer = has_stencil_buffer;
g_object_notify (G_OBJECT (area), "has-stencil-buffer");
priv->have_buffers = FALSE;
}
}
/**
* gtk_gl_area_queue_render:
* @area: a #GtkGLArea
*
* Marks the currently rendered data (if any) as invalid, and queues
* a redraw of the widget, ensuring that the #GtkGLArea::render signal
* is emitted during the draw.
*
* This is only needed when the gtk_gl_area_set_auto_render() has
* been called with a %FALSE value. The default behaviour is to
* emit #GtkGLArea::render on each draw.
*
* Since: 3.16
*/
void
gtk_gl_area_queue_render (GtkGLArea *area)
{
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
g_return_if_fail (GTK_IS_GL_AREA (area));
priv->needs_render = TRUE;
gtk_widget_queue_draw (GTK_WIDGET (area));
}
/**
* gtk_gl_area_get_auto_render:
* @area: a #GtkGLArea
*
* Returns whether the area is in auto render mode or not.
*
* Returns: %TRUE if the @area is auto rendering, %FALSE otherwise
*
* Since: 3.16
*/
gboolean
gtk_gl_area_get_auto_render (GtkGLArea *area)
{
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
g_return_val_if_fail (GTK_IS_GL_AREA (area), FALSE);
return priv->auto_render;
}
/**
* gtk_gl_area_set_auto_render:
* @area: a #GtkGLArea
* @auto_render: a boolean
*
* If @auto_render is %TRUE the #GtkGLArea::render signal will be
* emitted every time the widget draws. This is the default and is
* useful if drawing the widget is faster.
*
* If @auto_render is %FALSE the data from previous rendering is kept
* around and will be used for drawing the widget the next time,
* unless the window is resized. In order to force a rendering
* gtk_gl_area_queue_render() must be called. This mode is useful when
* the scene changes seldomly, but takes a long time to redraw.
*
* Since: 3.16
*/
void
gtk_gl_area_set_auto_render (GtkGLArea *area,
gboolean auto_render)
{
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
g_return_if_fail (GTK_IS_GL_AREA (area));
auto_render = !!auto_render;
if (priv->auto_render != auto_render)
{
priv->auto_render = auto_render;
g_object_notify (G_OBJECT (area), "auto-render");
if (auto_render)
gtk_widget_queue_draw (GTK_WIDGET (area));
}
}
/**
* gtk_gl_area_get_context:
* @area: a #GtkGLArea
*
* Retrieves the #GdkGLContext used by @area.
*
* Returns: (transfer none): the #GdkGLContext
*
* Since: 3.16
*/
GdkGLContext *
gtk_gl_area_get_context (GtkGLArea *area)
{
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
g_return_val_if_fail (GTK_IS_GL_AREA (area), NULL);
return priv->context;
}
/**
* gtk_gl_area_make_current:
* @area: a #GtkGLArea
*
* Ensures that the #GdkGLContext used by @area is associated with
* the #GtkGLArea.
*
* This function is automatically called before emitting the
* #GtkGLArea::render signal, and doesn't normally need to be called
* by application code.
*
* Since: 3.16
*/
void
gtk_gl_area_make_current (GtkGLArea *area)
{
GtkGLAreaPrivate *priv = gtk_gl_area_get_instance_private (area);
GtkWidget *widget;
g_return_if_fail (GTK_IS_GL_AREA (area));
widget = GTK_WIDGET (area);
g_return_if_fail (gtk_widget_get_realized (widget));
if (priv->context)
gdk_gl_context_make_current (priv->context);
}
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