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/* gdkgltexture.c
*
* Copyright 2016 Benjamin Otte
*
* 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 "gdkgltextureprivate.h"
#include "gdkcairo.h"
#include "gdktextureprivate.h"
#include <epoxy/gl.h>
struct _GdkGLTexture {
GdkTexture parent_instance;
GdkGLContext *context;
guint id;
cairo_surface_t *saved;
GDestroyNotify destroy;
gpointer data;
};
struct _GdkGLTextureClass {
GdkTextureClass parent_class;
};
G_DEFINE_TYPE (GdkGLTexture, gdk_gl_texture, GDK_TYPE_TEXTURE)
static void
gdk_gl_texture_dispose (GObject *object)
{
GdkGLTexture *self = GDK_GL_TEXTURE (object);
if (self->destroy)
{
self->destroy (self->data);
self->destroy = NULL;
self->data = NULL;
}
g_clear_object (&self->context);
self->id = 0;
if (self->saved)
{
cairo_surface_destroy (self->saved);
self->saved = NULL;
}
G_OBJECT_CLASS (gdk_gl_texture_parent_class)->dispose (object);
}
static void
gdk_gl_texture_download (GdkTexture *texture,
const GdkRectangle *area,
guchar *data,
gsize stride)
{
GdkGLTexture *self = GDK_GL_TEXTURE (texture);
cairo_surface_t *surface;
cairo_t *cr;
surface = cairo_image_surface_create_for_data (data,
CAIRO_FORMAT_ARGB32,
area->width, area->height,
stride);
cr = cairo_create (surface);
if (self->saved)
{
cairo_set_source_surface (cr, self->saved, 0, 0);
cairo_paint (cr);
}
else
{
GdkSurface *gl_surface;
gl_surface = gdk_gl_context_get_surface (self->context);
gdk_cairo_draw_from_gl (cr, gl_surface, self->id, GL_TEXTURE, 1,
area->x, area->y,
area->width, area->height);
}
cairo_destroy (cr);
cairo_surface_finish (surface);
cairo_surface_destroy (surface);
}
static void
gdk_gl_texture_class_init (GdkGLTextureClass *klass)
{
GdkTextureClass *texture_class = GDK_TEXTURE_CLASS (klass);
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
texture_class->download = gdk_gl_texture_download;
gobject_class->dispose = gdk_gl_texture_dispose;
}
static void
gdk_gl_texture_init (GdkGLTexture *self)
{
}
GdkGLContext *
gdk_gl_texture_get_context (GdkGLTexture *self)
{
return self->context;
}
guint
gdk_gl_texture_get_id (GdkGLTexture *self)
{
return self->id;
}
/**
* gdk_gl_texture_release:
* @self: a #GdkTexture wrapping a GL texture
*
* Releases the GL resources held by a #GdkGLTexture that
* was created with gdk_gl_texture_new().
*
* The texture contents are still available via the
* gdk_texture_download() function, after this function
* has been called.
*/
void
gdk_gl_texture_release (GdkGLTexture *self)
{
GdkSurface *surface;
GdkTexture *texture;
cairo_t *cr;
g_return_if_fail (GDK_IS_GL_TEXTURE (self));
g_return_if_fail (self->saved == NULL);
texture = GDK_TEXTURE (self);
self->saved = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
texture->width, texture->height);
cr = cairo_create (self->saved);
surface = gdk_gl_context_get_surface (self->context);
gdk_cairo_draw_from_gl (cr, surface, self->id, GL_TEXTURE, 1, 0, 0,
texture->width, texture->height);
cairo_destroy (cr);
if (self->destroy)
{
self->destroy (self->data);
self->destroy = NULL;
self->data = NULL;
}
g_clear_object (&self->context);
self->id = 0;
}
/**
* gdk_gl_texture_new:
* @context: a #GdkGLContext
* @id: the ID of a texture that was created with @context
* @width: the nominal width of the texture
* @height: the nominal height of the texture
* @destroy: a destroy notify that will be called when the GL resources
* are released
* @data: data that gets passed to @destroy
*
* Creates a new texture for an existing GL texture.
*
* Note that the GL texture must not be modified until @destroy is called,
* which will happen when the GdkTexture object is finalized, or due to
* an explicit call of gdk_gl_texture_release().
*
* Return value: (transfer full): A newly-created #GdkTexture
*/
GdkTexture *
gdk_gl_texture_new (GdkGLContext *context,
guint id,
int width,
int height,
GDestroyNotify destroy,
gpointer data)
{
GdkGLTexture *self;
g_return_val_if_fail (GDK_IS_GL_CONTEXT (context), NULL);
g_return_val_if_fail (id != 0, NULL);
g_return_val_if_fail (width > 0, NULL);
g_return_val_if_fail (height > 0, NULL);
self = g_object_new (GDK_TYPE_GL_TEXTURE,
"width", width,
"height", height,
NULL);
self->context = g_object_ref (context);
self->id = id;
self->destroy = destroy;
self->data = data;
return GDK_TEXTURE (self);
}
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