mutter/cogl/driver/nop/cogl-texture-2d-nop.c
Robert Bragg cbd6951134 introduce texture loaders to make allocations lazy
This introduces the internal idea of texture loaders that track the
state for loading and allocating a texture. This defers a lot more work
until the texture is allocated.

There are several intentions to this change:

- provides a means for extending how textures are allocated without
  requiring all the parameters to be supplied in a single _texture_new()
  function call.

- allow us to remove the internal_format argument from all
  _texture_new() apis since using CoglPixelFormat is bad way of
  expressing the internal format constraints because it is too specific.

  For now the internal_format arguments haven't actually been removed
  but this patch does introduce replacement apis for controlling the
  internal format:

    cogl_texture_set_components() lets you specify what components your
    texture needs when it is allocated.
    cogl_texture_set_premultiplied() lets you specify whether a texture
    data should be interpreted as premultiplied or not.

- Enable us to support asynchronous texture loading + allocation in the
  future.

Of note, the _new_from_data() texture constructors all continue to
allocate textures immediately so that existing code doesn't need to be
adapted to manage the lifetime of the data being uploaded.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
(cherry picked from commit 6a83de9ef4210f380a31f410797447b365a8d02c)

Note: Compared to the original patch, the ->premultipled state for
textures isn't forced to be %TRUE in _cogl_texture_init since that
effectively ignores the users explicitly given internal_format which was
a mistake and on master that change should have been made in the patch
that followed. The gtk-doc comments for cogl_texture_set_premultiplied()
and cogl_texture_set_components() have also been updated in-line with
this fix.
2014-01-09 15:49:46 +00:00

126 lines
3.5 KiB
C

/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2009,2010,2011,2012 Intel Corporation.
*
* 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:
* Neil Roberts <neil@linux.intel.com>
* Robert Bragg <robert@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "cogl-private.h"
#include "cogl-texture-2d-nop-private.h"
#include "cogl-texture-2d-private.h"
#include "cogl-error-private.h"
void
_cogl_texture_2d_nop_free (CoglTexture2D *tex_2d)
{
}
CoglBool
_cogl_texture_2d_nop_can_create (CoglContext *ctx,
int width,
int height,
CoglPixelFormat internal_format)
{
return TRUE;
}
void
_cogl_texture_2d_nop_init (CoglTexture2D *tex_2d)
{
}
CoglBool
_cogl_texture_2d_nop_allocate (CoglTexture *tex,
CoglError **error)
{
return TRUE;
}
void
_cogl_texture_2d_nop_flush_legacy_texobj_filters (CoglTexture *tex,
GLenum min_filter,
GLenum mag_filter)
{
}
void
_cogl_texture_2d_nop_flush_legacy_texobj_wrap_modes (CoglTexture *tex,
GLenum wrap_mode_s,
GLenum wrap_mode_t,
GLenum wrap_mode_p)
{
}
void
_cogl_texture_2d_nop_copy_from_framebuffer (CoglTexture2D *tex_2d,
int src_x,
int src_y,
int width,
int height,
CoglFramebuffer *src_fb,
int dst_x,
int dst_y,
int level)
{
}
unsigned int
_cogl_texture_2d_nop_get_gl_handle (CoglTexture2D *tex_2d)
{
return 0;
}
void
_cogl_texture_2d_nop_generate_mipmap (CoglTexture2D *tex_2d)
{
}
CoglBool
_cogl_texture_2d_nop_copy_from_bitmap (CoglTexture2D *tex_2d,
int src_x,
int src_y,
int width,
int height,
CoglBitmap *bitmap,
int dst_x,
int dst_y,
int level,
CoglError **error)
{
return TRUE;
}
void
_cogl_texture_2d_nop_get_data (CoglTexture2D *tex_2d,
CoglPixelFormat format,
size_t rowstride,
uint8_t *data)
{
}