texture: split out high-level texture constructors

This splits out the very high level texture constructors that may
internally construct one of several types of lower level texture due to
various constraints.

This also updates the prototypes for these constructors to take an
explicit context pointer and return a CoglError consistent with other
texture constructors.

Reviewed-by: Neil Roberts <neil@linux.intel.com>

(cherry picked from commit a1cabfae6ad50c51006c608cdde7d631b7832e71)
This commit is contained in:
Robert Bragg 2012-11-08 20:33:00 +00:00
parent e439bdd12f
commit 07d47eadd3
9 changed files with 400 additions and 336 deletions

View File

@ -361,6 +361,7 @@ cogl_sources_c = \
$(srcdir)/cogl-texture-driver.h \
$(srcdir)/cogl-sub-texture.c \
$(srcdir)/cogl-texture.c \
$(srcdir)/cogl-auto-texture.c \
$(srcdir)/cogl-texture-2d.c \
$(srcdir)/cogl-texture-2d-sliced.c \
$(srcdir)/cogl-texture-3d.c \

View File

@ -388,6 +388,15 @@ _cogl_atlas_texture_migrate_out_of_atlas (CoglAtlasTexture *atlas_tex)
atlas_tex->rectangle.height - 2,
COGL_TEXTURE_NO_ATLAS,
atlas_tex->format);
/* Note: we simply silently ignore failures to migrate a texture
* out (most likely due to lack of memory) and hope for the
* best.
*
* Maybe we should find a way to report the problem back to the
* app.
*/
if (!standalone_tex)
return;
/* Notify cogl-pipeline.c that the texture's underlying GL texture
* storage is changing so it knows it may need to bind a new texture

View File

@ -537,17 +537,19 @@ _cogl_atlas_remove (CoglAtlas *atlas,
};
CoglTexture *
_cogl_atlas_copy_rectangle (CoglAtlas *atlas,
unsigned int x,
unsigned int y,
unsigned int width,
unsigned int height,
CoglTextureFlags flags,
CoglPixelFormat format)
_cogl_atlas_copy_rectangle (CoglAtlas *atlas,
int x,
int y,
int width,
int height,
CoglTextureFlags flags,
CoglPixelFormat format)
{
CoglTexture *tex;
CoglBlitData blit_data;
_COGL_GET_CONTEXT (ctx, NULL);
/* Create a new texture at the right size */
tex = cogl_texture_new_with_size (width, height, flags, format);

View File

@ -75,13 +75,13 @@ _cogl_atlas_remove (CoglAtlas *atlas,
const CoglRectangleMapEntry *rectangle);
CoglTexture *
_cogl_atlas_copy_rectangle (CoglAtlas *atlas,
unsigned int x,
unsigned int y,
unsigned int width,
unsigned int height,
CoglTextureFlags flags,
CoglPixelFormat format);
_cogl_atlas_copy_rectangle (CoglAtlas *atlas,
int x,
int y,
int width,
int height,
CoglTextureFlags flags,
CoglPixelFormat format);
void
_cogl_atlas_add_reorganize_callback (CoglAtlas *atlas,

343
cogl/cogl-auto-texture.c Normal file
View File

@ -0,0 +1,343 @@
/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2007,2008,2009,2011,2012 Intel Corporation.
* Copyright (C) 2010 Red Hat, Inc.
*
* 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/>.
*
*
*
* Authors:
* Matthew Allum <mallum@openedhand.com>
* Neil Roberts <neil@linux.intel.com>
* Robert Bragg <robert@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl-context-private.h"
#include "cogl-texture.h"
#include "cogl-util.h"
#include "cogl-texture-2d.h"
#include "cogl-primitive-texture.h"
#include "cogl-texture-2d-sliced-private.h"
#include "cogl-private.h"
#include "cogl-object.h"
#include "cogl-bitmap-private.h"
#include "cogl-atlas-texture-private.h"
#include "cogl-error-private.h"
#include "cogl-texture-rectangle.h"
#include "cogl-sub-texture.h"
#include "cogl-texture-2d-gl.h"
CoglTexture *
cogl_texture_new_with_size (unsigned int width,
unsigned int height,
CoglTextureFlags flags,
CoglPixelFormat internal_format)
{
CoglTexture *tex;
_COGL_GET_CONTEXT (ctx, NULL);
if ((_cogl_util_is_pot (width) && _cogl_util_is_pot (height)) ||
(cogl_has_feature (ctx, COGL_FEATURE_ID_TEXTURE_NPOT_BASIC) &&
cogl_has_feature (ctx, COGL_FEATURE_ID_TEXTURE_NPOT_MIPMAP)))
{
/* First try creating a fast-path non-sliced texture */
tex = COGL_TEXTURE (cogl_texture_2d_new_with_size (ctx,
width, height,
internal_format,
NULL));
}
else
tex = NULL;
if (tex)
{
CoglBool auto_mipmap = !(flags & COGL_TEXTURE_NO_AUTO_MIPMAP);
cogl_primitive_texture_set_auto_mipmap (COGL_PRIMITIVE_TEXTURE (tex),
auto_mipmap);
}
else
{
/* If it fails resort to sliced textures */
int max_waste = flags & COGL_TEXTURE_NO_SLICING ? -1 : COGL_TEXTURE_MAX_WASTE;
tex = COGL_TEXTURE (cogl_texture_2d_sliced_new_with_size (ctx,
width,
height,
max_waste,
internal_format,
NULL));
}
return tex;
}
static CoglTexture *
_cogl_texture_new_from_data (CoglContext *ctx,
int width,
int height,
CoglTextureFlags flags,
CoglPixelFormat format,
CoglPixelFormat internal_format,
int rowstride,
const uint8_t *data,
CoglError **error)
{
CoglBitmap *bmp;
CoglTexture *tex;
_COGL_RETURN_VAL_IF_FAIL (format != COGL_PIXEL_FORMAT_ANY, NULL);
_COGL_RETURN_VAL_IF_FAIL (data != NULL, NULL);
/* Rowstride from width if not given */
if (rowstride == 0)
rowstride = width * _cogl_pixel_format_get_bytes_per_pixel (format);
/* Wrap the data into a bitmap */
bmp = cogl_bitmap_new_for_data (ctx,
width, height,
format,
rowstride,
(uint8_t *) data);
tex = _cogl_texture_new_from_bitmap (bmp, flags, internal_format, error);
cogl_object_unref (bmp);
return tex;
}
CoglTexture *
cogl_texture_new_from_data (int width,
int height,
CoglTextureFlags flags,
CoglPixelFormat format,
CoglPixelFormat internal_format,
int rowstride,
const uint8_t *data)
{
CoglError *ignore_error = NULL;
CoglTexture *tex;
_COGL_GET_CONTEXT (ctx, NULL);
tex = _cogl_texture_new_from_data (ctx,
width, height,
flags,
format, internal_format,
rowstride,
data,
&ignore_error);
if (!tex)
cogl_error_free (ignore_error);
return tex;
}
CoglTexture *
_cogl_texture_new_from_bitmap (CoglBitmap *bitmap,
CoglTextureFlags flags,
CoglPixelFormat internal_format,
CoglError **error)
{
CoglContext *ctx = _cogl_bitmap_get_context (bitmap);
CoglAtlasTexture *atlas_tex;
CoglTexture *tex;
CoglError *internal_error = NULL;
/* First try putting the texture in the atlas */
if ((atlas_tex = _cogl_atlas_texture_new_from_bitmap (bitmap,
flags,
internal_format,
&internal_error)))
return COGL_TEXTURE (atlas_tex);
if (cogl_error_matches (internal_error,
COGL_SYSTEM_ERROR,
COGL_SYSTEM_ERROR_NO_MEMORY))
{
_cogl_propogate_error (error, internal_error);
return NULL;
}
cogl_error_free (internal_error);
internal_error = NULL;
/* If that doesn't work try a fast path 2D texture */
if ((_cogl_util_is_pot (bitmap->width) &&
_cogl_util_is_pot (bitmap->height)) ||
(cogl_has_feature (ctx, COGL_FEATURE_ID_TEXTURE_NPOT_BASIC) &&
cogl_has_feature (ctx, COGL_FEATURE_ID_TEXTURE_NPOT_MIPMAP)))
{
tex = COGL_TEXTURE (cogl_texture_2d_new_from_bitmap (bitmap,
internal_format,
&internal_error));
if (cogl_error_matches (internal_error,
COGL_SYSTEM_ERROR,
COGL_SYSTEM_ERROR_NO_MEMORY))
{
_cogl_propogate_error (error, internal_error);
return NULL;
}
if (!tex)
{
cogl_error_free (internal_error);
internal_error = NULL;
}
}
else
tex = NULL;
if (tex)
{
CoglBool auto_mipmap = !(flags & COGL_TEXTURE_NO_AUTO_MIPMAP);
cogl_primitive_texture_set_auto_mipmap (COGL_PRIMITIVE_TEXTURE (tex),
auto_mipmap);
}
else
{
/* Otherwise create a sliced texture */
tex = COGL_TEXTURE (_cogl_texture_2d_sliced_new_from_bitmap (bitmap,
flags,
internal_format,
error));
}
return tex;
}
CoglTexture *
cogl_texture_new_from_bitmap (CoglBitmap *bitmap,
CoglTextureFlags flags,
CoglPixelFormat internal_format)
{
CoglError *ignore_error = NULL;
CoglTexture *tex =
_cogl_texture_new_from_bitmap (bitmap, flags, internal_format,
&ignore_error);
if (!tex)
cogl_error_free (ignore_error);
return tex;
}
CoglTexture *
cogl_texture_new_from_file (const char *filename,
CoglTextureFlags flags,
CoglPixelFormat internal_format,
CoglError **error)
{
CoglBitmap *bmp;
CoglTexture *texture = NULL;
CoglPixelFormat src_format;
_COGL_GET_CONTEXT (ctx, NULL);
_COGL_RETURN_VAL_IF_FAIL (error == NULL || *error == NULL, NULL);
bmp = cogl_bitmap_new_from_file (filename, error);
if (bmp == NULL)
return NULL;
src_format = cogl_bitmap_get_format (bmp);
/* We know that the bitmap data is solely owned by this function so
we can do the premult conversion in place. This avoids having to
copy the bitmap which will otherwise happen in
_cogl_texture_prepare_for_upload */
internal_format =
_cogl_texture_determine_internal_format (src_format, internal_format);
if (!_cogl_texture_needs_premult_conversion (src_format, internal_format) ||
_cogl_bitmap_convert_premult_status (bmp,
src_format ^ COGL_PREMULT_BIT,
error))
{
texture =
_cogl_texture_new_from_bitmap (bmp, flags, internal_format, error);
}
cogl_object_unref (bmp);
return texture;
}
CoglTexture *
cogl_texture_new_from_foreign (GLuint gl_handle,
GLenum gl_target,
GLuint width,
GLuint height,
GLuint x_pot_waste,
GLuint y_pot_waste,
CoglPixelFormat format)
{
_COGL_GET_CONTEXT (ctx, NULL);
#if HAVE_COGL_GL
if (gl_target == GL_TEXTURE_RECTANGLE_ARB)
{
CoglTextureRectangle *texture_rectangle;
CoglSubTexture *sub_texture;
if (x_pot_waste != 0 || y_pot_waste != 0)
{
/* It shouldn't be necessary to have waste in this case since
* the texture isn't limited to power of two sizes. */
g_warning ("You can't create a foreign GL_TEXTURE_RECTANGLE cogl "
"texture with waste\n");
return NULL;
}
texture_rectangle = cogl_texture_rectangle_new_from_foreign (ctx,
gl_handle,
width,
height,
format,
NULL);
/* CoglTextureRectangle textures work with non-normalized
* coordinates, but the semantics for this function that people
* depend on are that all returned texture works with normalized
* coordinates so we wrap with a CoglSubTexture... */
sub_texture = cogl_sub_texture_new (ctx,
COGL_TEXTURE (texture_rectangle),
0, 0, width, height);
return COGL_TEXTURE (sub_texture);
}
#endif
if (x_pot_waste != 0 || y_pot_waste != 0)
return COGL_TEXTURE (_cogl_texture_2d_sliced_new_from_foreign (ctx,
gl_handle,
gl_target,
width,
height,
x_pot_waste,
y_pot_waste,
format,
NULL));
else
return COGL_TEXTURE (cogl_texture_2d_new_from_foreign (ctx,
gl_handle,
width,
height,
format,
NULL));
}

View File

@ -44,13 +44,15 @@ struct _CoglTexture2DSliced
};
CoglTexture2DSliced *
_cogl_texture_2d_sliced_new_from_foreign (GLuint gl_handle,
GLenum gl_target,
GLuint width,
GLuint height,
GLuint x_pot_waste,
GLuint y_pot_waste,
CoglPixelFormat format);
_cogl_texture_2d_sliced_new_from_foreign (CoglContext *context,
unsigned int gl_handle,
unsigned int gl_target,
int width,
int height,
int x_pot_waste,
int y_pot_waste,
CoglPixelFormat format,
CoglError **error);
CoglTexture2DSliced *
_cogl_texture_2d_sliced_new_from_bitmap (CoglBitmap *bmp,

View File

@ -992,32 +992,32 @@ _cogl_texture_2d_sliced_new_from_bitmap (CoglBitmap *bmp,
}
CoglTexture2DSliced *
_cogl_texture_2d_sliced_new_from_foreign (GLuint gl_handle,
GLenum gl_target,
GLuint width,
GLuint height,
GLuint x_pot_waste,
GLuint y_pot_waste,
CoglPixelFormat format)
_cogl_texture_2d_sliced_new_from_foreign (CoglContext *ctx,
unsigned int gl_handle,
unsigned int gl_target,
int width,
int height,
int x_pot_waste,
int y_pot_waste,
CoglPixelFormat format,
CoglError **error)
{
/* NOTE: width, height and internal format are not queriable
* in GLES, hence such a function prototype.
*/
GLint gl_width = 0;
GLint gl_height = 0;
int gl_width = 0;
int gl_height = 0;
CoglTexture2DSliced *tex_2ds;
CoglTexture *tex;
CoglSpan x_span;
CoglSpan y_span;
CoglTexture2D *tex_2d;
_COGL_GET_CONTEXT (ctx, NULL);
CoglTexture *tex;
CoglSpan x_span;
CoglSpan y_span;
CoglTexture2D *tex_2d;
/* This should only be called when the texture target is 2D. If a
rectangle texture is used then _cogl_texture_new_from_foreign
will create a cogl_texture_rectangle instead */
g_assert (gl_target == GL_TEXTURE_2D);
_COGL_RETURN_VAL_IF_FAIL (gl_target == GL_TEXTURE_2D, NULL);
gl_width = width + x_pot_waste;
gl_height = height + y_pot_waste;
@ -1032,7 +1032,7 @@ _cogl_texture_2d_sliced_new_from_foreign (GLuint gl_handle,
gl_width,
gl_height,
format,
NULL);
error);
if (!tex_2d)
return NULL;

View File

@ -312,4 +312,8 @@ _cogl_texture_set_region_from_bitmap (CoglTexture *texture,
CoglBitmap *bmp,
CoglError **error);
CoglBool
_cogl_texture_needs_premult_conversion (CoglPixelFormat src_format,
CoglPixelFormat dst_format);
#endif /* __COGL_TEXTURE_PRIVATE_H */

View File

@ -144,7 +144,7 @@ _cogl_texture_free (CoglTexture *texture)
g_free (texture);
}
static CoglBool
CoglBool
_cogl_texture_needs_premult_conversion (CoglPixelFormat src_format,
CoglPixelFormat dst_format)
{
@ -312,303 +312,6 @@ _cogl_texture_prep_gl_alignment_for_pixels_download (int bpp,
GE( ctx, glPixelStorei (GL_PACK_ALIGNMENT, alignment) );
}
CoglTexture *
cogl_texture_new_with_size (unsigned int width,
unsigned int height,
CoglTextureFlags flags,
CoglPixelFormat internal_format)
{
CoglTexture *tex;
_COGL_GET_CONTEXT (ctx, NULL);
if ((_cogl_util_is_pot (width) && _cogl_util_is_pot (height)) ||
(cogl_has_feature (ctx, COGL_FEATURE_ID_TEXTURE_NPOT_BASIC) &&
cogl_has_feature (ctx, COGL_FEATURE_ID_TEXTURE_NPOT_MIPMAP)))
{
/* First try creating a fast-path non-sliced texture */
tex = COGL_TEXTURE (cogl_texture_2d_new_with_size (ctx,
width, height,
internal_format,
NULL));
}
else
tex = NULL;
if (tex)
{
CoglBool auto_mipmap = !(flags & COGL_TEXTURE_NO_AUTO_MIPMAP);
cogl_primitive_texture_set_auto_mipmap (COGL_PRIMITIVE_TEXTURE (tex),
auto_mipmap);
}
else
{
/* If it fails resort to sliced textures */
int max_waste = flags & COGL_TEXTURE_NO_SLICING ? -1 : COGL_TEXTURE_MAX_WASTE;
tex = COGL_TEXTURE (cogl_texture_2d_sliced_new_with_size (ctx,
width,
height,
max_waste,
internal_format,
NULL));
}
return tex;
}
static CoglTexture *
_cogl_texture_new_from_data (CoglContext *ctx,
int width,
int height,
CoglTextureFlags flags,
CoglPixelFormat format,
CoglPixelFormat internal_format,
int rowstride,
const uint8_t *data,
CoglError **error)
{
CoglBitmap *bmp;
CoglTexture *tex;
_COGL_RETURN_VAL_IF_FAIL (format != COGL_PIXEL_FORMAT_ANY, NULL);
_COGL_RETURN_VAL_IF_FAIL (data != NULL, NULL);
/* Rowstride from width if not given */
if (rowstride == 0)
rowstride = width * _cogl_pixel_format_get_bytes_per_pixel (format);
/* Wrap the data into a bitmap */
bmp = cogl_bitmap_new_for_data (ctx,
width, height,
format,
rowstride,
(uint8_t *) data);
tex = _cogl_texture_new_from_bitmap (bmp, flags, internal_format, error);
cogl_object_unref (bmp);
return tex;
}
CoglTexture *
cogl_texture_new_from_data (int width,
int height,
CoglTextureFlags flags,
CoglPixelFormat format,
CoglPixelFormat internal_format,
int rowstride,
const uint8_t *data)
{
CoglError *ignore_error = NULL;
CoglTexture *tex;
_COGL_GET_CONTEXT (ctx, NULL);
tex = _cogl_texture_new_from_data (ctx,
width, height,
flags,
format, internal_format,
rowstride,
data,
&ignore_error);
if (!tex)
cogl_error_free (ignore_error);
return tex;
}
CoglTexture *
_cogl_texture_new_from_bitmap (CoglBitmap *bitmap,
CoglTextureFlags flags,
CoglPixelFormat internal_format,
CoglError **error)
{
CoglContext *ctx = _cogl_bitmap_get_context (bitmap);
CoglAtlasTexture *atlas_tex;
CoglTexture *tex;
CoglError *internal_error = NULL;
/* First try putting the texture in the atlas */
if ((atlas_tex = _cogl_atlas_texture_new_from_bitmap (bitmap,
flags,
internal_format,
&internal_error)))
return COGL_TEXTURE (atlas_tex);
if (cogl_error_matches (internal_error,
COGL_SYSTEM_ERROR,
COGL_SYSTEM_ERROR_NO_MEMORY))
{
_cogl_propogate_error (error, internal_error);
return NULL;
}
cogl_error_free (internal_error);
internal_error = NULL;
/* If that doesn't work try a fast path 2D texture */
if ((_cogl_util_is_pot (bitmap->width) &&
_cogl_util_is_pot (bitmap->height)) ||
(cogl_has_feature (ctx, COGL_FEATURE_ID_TEXTURE_NPOT_BASIC) &&
cogl_has_feature (ctx, COGL_FEATURE_ID_TEXTURE_NPOT_MIPMAP)))
{
tex = COGL_TEXTURE (cogl_texture_2d_new_from_bitmap (bitmap,
internal_format,
&internal_error));
if (cogl_error_matches (internal_error,
COGL_SYSTEM_ERROR,
COGL_SYSTEM_ERROR_NO_MEMORY))
{
_cogl_propogate_error (error, internal_error);
return NULL;
}
if (!tex)
{
cogl_error_free (internal_error);
internal_error = NULL;
}
}
else
tex = NULL;
if (tex)
{
CoglBool auto_mipmap = !(flags & COGL_TEXTURE_NO_AUTO_MIPMAP);
cogl_primitive_texture_set_auto_mipmap (COGL_PRIMITIVE_TEXTURE (tex),
auto_mipmap);
}
else
{
/* Otherwise create a sliced texture */
tex = COGL_TEXTURE (_cogl_texture_2d_sliced_new_from_bitmap (bitmap,
flags,
internal_format,
error));
}
return tex;
}
CoglTexture *
cogl_texture_new_from_bitmap (CoglBitmap *bitmap,
CoglTextureFlags flags,
CoglPixelFormat internal_format)
{
CoglError *ignore_error = NULL;
CoglTexture *tex =
_cogl_texture_new_from_bitmap (bitmap, flags, internal_format,
&ignore_error);
if (!tex)
cogl_error_free (ignore_error);
return tex;
}
CoglTexture *
cogl_texture_new_from_file (const char *filename,
CoglTextureFlags flags,
CoglPixelFormat internal_format,
CoglError **error)
{
CoglBitmap *bmp;
CoglTexture *texture = NULL;
CoglPixelFormat src_format;
_COGL_GET_CONTEXT (ctx, NULL);
_COGL_RETURN_VAL_IF_FAIL (error == NULL || *error == NULL, NULL);
bmp = cogl_bitmap_new_from_file (filename, error);
if (bmp == NULL)
return NULL;
src_format = cogl_bitmap_get_format (bmp);
/* We know that the bitmap data is solely owned by this function so
we can do the premult conversion in place. This avoids having to
copy the bitmap which will otherwise happen in
_cogl_texture_prepare_for_upload */
internal_format =
_cogl_texture_determine_internal_format (src_format, internal_format);
if (!_cogl_texture_needs_premult_conversion (src_format, internal_format) ||
_cogl_bitmap_convert_premult_status (bmp,
src_format ^ COGL_PREMULT_BIT,
error))
{
texture =
_cogl_texture_new_from_bitmap (bmp, flags, internal_format, error);
}
cogl_object_unref (bmp);
return texture;
}
CoglTexture *
cogl_texture_new_from_foreign (GLuint gl_handle,
GLenum gl_target,
GLuint width,
GLuint height,
GLuint x_pot_waste,
GLuint y_pot_waste,
CoglPixelFormat format)
{
#if HAVE_COGL_GL
if (gl_target == GL_TEXTURE_RECTANGLE_ARB)
{
CoglTextureRectangle *texture_rectangle;
CoglSubTexture *sub_texture;
_COGL_GET_CONTEXT (ctx, NULL);
if (x_pot_waste != 0 || y_pot_waste != 0)
{
/* It shouldn't be necessary to have waste in this case since
* the texture isn't limited to power of two sizes. */
g_warning ("You can't create a foreign GL_TEXTURE_RECTANGLE cogl "
"texture with waste\n");
return NULL;
}
texture_rectangle = cogl_texture_rectangle_new_from_foreign (ctx,
gl_handle,
width,
height,
format,
NULL);
/* CoglTextureRectangle textures work with non-normalized
* coordinates, but the semantics for this function that people
* depend on are that all returned texture works with normalized
* coordinates so we wrap with a CoglSubTexture... */
sub_texture = cogl_sub_texture_new (ctx,
COGL_TEXTURE (texture_rectangle),
0, 0, width, height);
return COGL_TEXTURE (sub_texture);
}
#endif
if (x_pot_waste != 0 || y_pot_waste != 0)
return COGL_TEXTURE (_cogl_texture_2d_sliced_new_from_foreign (gl_handle,
gl_target,
width,
height,
x_pot_waste,
y_pot_waste,
format));
else
{
_COGL_GET_CONTEXT (ctx, NULL);
return COGL_TEXTURE (cogl_texture_2d_new_from_foreign (ctx,
gl_handle,
width,
height,
format,
NULL));
}
}
CoglBool
_cogl_texture_is_foreign (CoglTexture *texture)
{