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mutter/cogl/cogl-sub-texture.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

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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2009,2010,2011 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>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl-util.h"
#include "cogl-texture-private.h"
#include "cogl-sub-texture-private.h"
#include "cogl-sub-texture.h"
#include "cogl-context-private.h"
#include "cogl-object.h"
#include "cogl-texture-driver.h"
#include "cogl-texture-rectangle-private.h"
#include "cogl-texture-2d.h"
#include "cogl-texture-gl-private.h"
#include <string.h>
#include <math.h>
static void _cogl_sub_texture_free (CoglSubTexture *sub_tex);
COGL_TEXTURE_DEFINE (SubTexture, sub_texture);
static const CoglTextureVtable cogl_sub_texture_vtable;
static void
_cogl_sub_texture_unmap_quad (CoglSubTexture *sub_tex,
float *coords)
{
CoglTexture *tex = COGL_TEXTURE (sub_tex);
/* NB: coords[] come in as non-normalized if sub_tex->full_texture
* is a CoglTextureRectangle otherwhise they are normalized. The
* coordinates we write out though must always be normalized.
*
* NB: sub_tex->sub_x/y/width/height are in non-normalized
* coordinates.
*/
if (cogl_is_texture_rectangle (sub_tex->full_texture))
{
coords[0] = (coords[0] - sub_tex->sub_x) / tex->width;
coords[1] = (coords[1] - sub_tex->sub_y) / tex->height;
coords[2] = (coords[2] - sub_tex->sub_x) / tex->width;
coords[3] = (coords[3] - sub_tex->sub_y) / tex->height;
}
else
{
float width = cogl_texture_get_width (sub_tex->full_texture);
float height = cogl_texture_get_height (sub_tex->full_texture);
coords[0] = (coords[0] * width - sub_tex->sub_x) / tex->width;
coords[1] = (coords[1] * height - sub_tex->sub_y) / tex->height;
coords[2] = (coords[2] * width - sub_tex->sub_x) / tex->width;
coords[3] = (coords[3] * height - sub_tex->sub_y) / tex->height;
}
}
static void
_cogl_sub_texture_map_quad (CoglSubTexture *sub_tex,
float *coords)
{
CoglTexture *tex = COGL_TEXTURE (sub_tex);
/* NB: coords[] always come in as normalized coordinates but may go
* out as non-normalized if sub_tex->full_texture is a
* CoglTextureRectangle.
*
* NB: sub_tex->sub_x/y/width/height are in non-normalized
* coordinates.
*/
if (cogl_is_texture_rectangle (sub_tex->full_texture))
{
coords[0] = coords[0] * tex->width + sub_tex->sub_x;
coords[1] = coords[1] * tex->height + sub_tex->sub_y;
coords[2] = coords[2] * tex->width + sub_tex->sub_x;
coords[3] = coords[3] * tex->height + sub_tex->sub_y;
}
else
{
float width = cogl_texture_get_width (sub_tex->full_texture);
float height = cogl_texture_get_height (sub_tex->full_texture);
coords[0] = (coords[0] * tex->width + sub_tex->sub_x) / width;
coords[1] = (coords[1] * tex->height + sub_tex->sub_y) / height;
coords[2] = (coords[2] * tex->width + sub_tex->sub_x) / width;
coords[3] = (coords[3] * tex->height + sub_tex->sub_y) / height;
}
}
typedef struct _CoglSubTextureForeachData
{
CoglSubTexture *sub_tex;
CoglMetaTextureCallback callback;
void *user_data;
} CoglSubTextureForeachData;
static void
unmap_coords_cb (CoglTexture *slice_texture,
const float *slice_texture_coords,
const float *meta_coords,
void *user_data)
{
CoglSubTextureForeachData *data = user_data;
float unmapped_coords[4];
memcpy (unmapped_coords, meta_coords, sizeof (unmapped_coords));
_cogl_sub_texture_unmap_quad (data->sub_tex, unmapped_coords);
data->callback (slice_texture,
slice_texture_coords,
unmapped_coords,
data->user_data);
}
static void
_cogl_sub_texture_foreach_sub_texture_in_region (
CoglTexture *tex,
float virtual_tx_1,
float virtual_ty_1,
float virtual_tx_2,
float virtual_ty_2,
CoglMetaTextureCallback callback,
void *user_data)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
CoglTexture *full_texture = sub_tex->full_texture;
float mapped_coords[4] =
{ virtual_tx_1, virtual_ty_1, virtual_tx_2, virtual_ty_2};
float virtual_coords[4] =
{ virtual_tx_1, virtual_ty_1, virtual_tx_2, virtual_ty_2};
/* map the virtual coordinates to ->full_texture coordinates */
_cogl_sub_texture_map_quad (sub_tex, mapped_coords);
/* TODO: Add something like cogl_is_low_level_texture() */
if (cogl_is_texture_2d (full_texture) ||
cogl_is_texture_rectangle (full_texture))
{
callback (sub_tex->full_texture,
mapped_coords,
virtual_coords,
user_data);
}
else
{
CoglSubTextureForeachData data;
data.sub_tex = sub_tex;
data.callback = callback;
data.user_data = user_data;
cogl_meta_texture_foreach_in_region (COGL_META_TEXTURE (full_texture),
mapped_coords[0],
mapped_coords[1],
mapped_coords[2],
mapped_coords[3],
COGL_PIPELINE_WRAP_MODE_REPEAT,
COGL_PIPELINE_WRAP_MODE_REPEAT,
unmap_coords_cb,
&data);
}
}
static void
_cogl_sub_texture_gl_flush_legacy_texobj_wrap_modes (CoglTexture *tex,
GLenum wrap_mode_s,
GLenum wrap_mode_t,
GLenum wrap_mode_p)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
_cogl_texture_gl_flush_legacy_texobj_wrap_modes (sub_tex->full_texture,
wrap_mode_s,
wrap_mode_t,
wrap_mode_p);
}
static void
_cogl_sub_texture_free (CoglSubTexture *sub_tex)
{
cogl_object_unref (sub_tex->next_texture);
cogl_object_unref (sub_tex->full_texture);
/* Chain up */
_cogl_texture_free (COGL_TEXTURE (sub_tex));
}
CoglSubTexture *
cogl_sub_texture_new (CoglContext *ctx,
CoglTexture *next_texture,
int sub_x, int sub_y,
int sub_width, int sub_height)
{
CoglTexture *full_texture;
CoglSubTexture *sub_tex;
CoglTexture *tex;
unsigned int next_width, next_height;
next_width = cogl_texture_get_width (next_texture);
next_height = cogl_texture_get_height (next_texture);
/* The region must specify a non-zero subset of the full texture */
_COGL_RETURN_VAL_IF_FAIL (sub_x >= 0 && sub_y >= 0, NULL);
_COGL_RETURN_VAL_IF_FAIL (sub_width > 0 && sub_height > 0, NULL);
_COGL_RETURN_VAL_IF_FAIL (sub_x + sub_width <= next_width, NULL);
_COGL_RETURN_VAL_IF_FAIL (sub_y + sub_height <= next_height, NULL);
sub_tex = g_new (CoglSubTexture, 1);
tex = COGL_TEXTURE (sub_tex);
_cogl_texture_init (tex, ctx, sub_width, sub_height,
_cogl_texture_get_format (next_texture),
NULL, /* no loader */
&cogl_sub_texture_vtable);
/* If the next texture is also a sub texture we can avoid one level
of indirection by referencing the full texture of that texture
instead. */
if (cogl_is_sub_texture (next_texture))
{
CoglSubTexture *other_sub_tex = COGL_SUB_TEXTURE (next_texture);
full_texture = other_sub_tex->full_texture;
sub_x += other_sub_tex->sub_x;
sub_y += other_sub_tex->sub_y;
}
else
full_texture = next_texture;
sub_tex->next_texture = cogl_object_ref (next_texture);
sub_tex->full_texture = cogl_object_ref (full_texture);
sub_tex->sub_x = sub_x;
sub_tex->sub_y = sub_y;
return _cogl_sub_texture_object_new (sub_tex);
}
static CoglBool
_cogl_sub_texture_allocate (CoglTexture *tex,
CoglError **error)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
CoglBool status = cogl_texture_allocate (sub_tex->full_texture, error);
_cogl_texture_set_allocated (tex,
_cogl_texture_get_format (sub_tex->full_texture),
tex->width, tex->height);
return status;
}
CoglTexture *
cogl_sub_texture_get_parent (CoglSubTexture *sub_texture)
{
return sub_texture->next_texture;
}
static int
_cogl_sub_texture_get_max_waste (CoglTexture *tex)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
return cogl_texture_get_max_waste (sub_tex->full_texture);
}
static CoglBool
_cogl_sub_texture_is_sliced (CoglTexture *tex)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
return cogl_texture_is_sliced (sub_tex->full_texture);
}
static CoglBool
_cogl_sub_texture_can_hardware_repeat (CoglTexture *tex)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
/* We can hardware repeat if the subtexture actually represents all of the
of the full texture */
return (tex->width ==
cogl_texture_get_width (sub_tex->full_texture) &&
tex->height ==
cogl_texture_get_height (sub_tex->full_texture) &&
_cogl_texture_can_hardware_repeat (sub_tex->full_texture));
}
static void
_cogl_sub_texture_transform_coords_to_gl (CoglTexture *tex,
float *s,
float *t)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
/* This won't work if the sub texture is not the size of the full
texture and the coordinates are outside the range [0,1] */
*s = ((*s * tex->width + sub_tex->sub_x) /
cogl_texture_get_width (sub_tex->full_texture));
*t = ((*t * tex->height + sub_tex->sub_y) /
cogl_texture_get_height (sub_tex->full_texture));
_cogl_texture_transform_coords_to_gl (sub_tex->full_texture, s, t);
}
static CoglTransformResult
_cogl_sub_texture_transform_quad_coords_to_gl (CoglTexture *tex,
float *coords)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
int i;
/* We can't support repeating with this method. In this case
cogl-primitives will resort to manual repeating */
for (i = 0; i < 4; i++)
if (coords[i] < 0.0f || coords[i] > 1.0f)
return COGL_TRANSFORM_SOFTWARE_REPEAT;
_cogl_sub_texture_map_quad (sub_tex, coords);
return _cogl_texture_transform_quad_coords_to_gl (sub_tex->full_texture,
coords);
}
static CoglBool
_cogl_sub_texture_get_gl_texture (CoglTexture *tex,
GLuint *out_gl_handle,
GLenum *out_gl_target)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
return cogl_texture_get_gl_texture (sub_tex->full_texture,
out_gl_handle,
out_gl_target);
}
static void
_cogl_sub_texture_gl_flush_legacy_texobj_filters (CoglTexture *tex,
GLenum min_filter,
GLenum mag_filter)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
_cogl_texture_gl_flush_legacy_texobj_filters (sub_tex->full_texture,
min_filter, mag_filter);
}
static void
_cogl_sub_texture_pre_paint (CoglTexture *tex,
CoglTexturePrePaintFlags flags)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
_cogl_texture_pre_paint (sub_tex->full_texture, flags);
}
static void
_cogl_sub_texture_ensure_non_quad_rendering (CoglTexture *tex)
{
}
static CoglBool
_cogl_sub_texture_set_region (CoglTexture *tex,
int src_x,
int src_y,
int dst_x,
int dst_y,
int dst_width,
int dst_height,
int level,
CoglBitmap *bmp,
CoglError **error)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
if (level != 0)
{
int full_width = cogl_texture_get_width (sub_tex->full_texture);
int full_height = cogl_texture_get_width (sub_tex->full_texture);
_COGL_RETURN_VAL_IF_FAIL (sub_tex->sub_x == 0 &&
cogl_texture_get_width (tex) == full_width,
FALSE);
_COGL_RETURN_VAL_IF_FAIL (sub_tex->sub_y == 0 &&
cogl_texture_get_height (tex) == full_height,
FALSE);
}
return _cogl_texture_set_region_from_bitmap (sub_tex->full_texture,
src_x, src_y,
dst_width, dst_height,
bmp,
dst_x + sub_tex->sub_x,
dst_y + sub_tex->sub_y,
level,
error);
}
static CoglPixelFormat
_cogl_sub_texture_get_format (CoglTexture *tex)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
return _cogl_texture_get_format (sub_tex->full_texture);
}
static GLenum
_cogl_sub_texture_get_gl_format (CoglTexture *tex)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
return _cogl_texture_gl_get_format (sub_tex->full_texture);
}
static CoglTextureType
_cogl_sub_texture_get_type (CoglTexture *tex)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
return _cogl_texture_get_type (sub_tex->full_texture);
}
static const CoglTextureVtable
cogl_sub_texture_vtable =
{
FALSE, /* not primitive */
_cogl_sub_texture_allocate,
_cogl_sub_texture_set_region,
NULL, /* get_data */
_cogl_sub_texture_foreach_sub_texture_in_region,
_cogl_sub_texture_get_max_waste,
_cogl_sub_texture_is_sliced,
_cogl_sub_texture_can_hardware_repeat,
_cogl_sub_texture_transform_coords_to_gl,
_cogl_sub_texture_transform_quad_coords_to_gl,
_cogl_sub_texture_get_gl_texture,
_cogl_sub_texture_gl_flush_legacy_texobj_filters,
_cogl_sub_texture_pre_paint,
_cogl_sub_texture_ensure_non_quad_rendering,
_cogl_sub_texture_gl_flush_legacy_texobj_wrap_modes,
_cogl_sub_texture_get_format,
_cogl_sub_texture_get_gl_format,
_cogl_sub_texture_get_type,
NULL, /* is_foreign */
NULL /* set_auto_mipmap */
};
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