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mutter/cogl/cogl-sub-texture.c
Neil Roberts 8012eee31f Add _cogl_texture_get_type() 
This adds an internal function to get the type of the underlying
hardware texture for any CoglTexture. It can return one of three
values to represent 2D textures, 3D textures or rectangle textures.
The idea is that this can be used as a replacement for
cogl_texture_get_gl_texture when only the target is required to make
it a bit less GL-centric. The implementation adds a new virtual
function which all of the texture backends now implement.

The enum is in a public header because a later patch will want to use
it from the CoglPipeline API. We may want to consider making the
function public too later.

Reviewed-by: Robert Bragg <robert@linux.intel.com>
2012-02-13 17:02:46 +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.h"
#include "cogl-internal.h"
#include "cogl-util.h"
#include "cogl-texture-private.h"
#include "cogl-sub-texture-private.h"
#include "cogl-context-private.h"
#include "cogl-object.h"
#include "cogl-texture-driver.h"
#include "cogl-texture-rectangle-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)
{
/* 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) / sub_tex->sub_width;
coords[1] = (coords[1] - sub_tex->sub_y) / sub_tex->sub_height;
coords[2] = (coords[2] - sub_tex->sub_x) / sub_tex->sub_width;
coords[3] = (coords[3] - sub_tex->sub_y) / sub_tex->sub_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) / sub_tex->sub_width;
coords[1] = (coords[1] * height - sub_tex->sub_y) / sub_tex->sub_height;
coords[2] = (coords[2] * width - sub_tex->sub_x) / sub_tex->sub_width;
coords[3] = (coords[3] * height - sub_tex->sub_y) / sub_tex->sub_height;
}
}
static void
_cogl_sub_texture_map_quad (CoglSubTexture *sub_tex,
float *coords)
{
/* 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] * sub_tex->sub_width + sub_tex->sub_x;
coords[1] = coords[1] * sub_tex->sub_height + sub_tex->sub_y;
coords[2] = coords[2] * sub_tex->sub_width + sub_tex->sub_x;
coords[3] = coords[3] * sub_tex->sub_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] * sub_tex->sub_width + sub_tex->sub_x) / width;
coords[1] = (coords[1] * sub_tex->sub_height + sub_tex->sub_y) / height;
coords[2] = (coords[2] * sub_tex->sub_width + sub_tex->sub_x) / width;
coords[3] = (coords[3] * sub_tex->sub_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_set_wrap_mode_parameters (CoglTexture *tex,
GLenum wrap_mode_s,
GLenum wrap_mode_t,
GLenum wrap_mode_p)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
_cogl_texture_set_wrap_mode_parameters (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, &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_pointer_from_handle (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;
sub_tex->sub_width = sub_width;
sub_tex->sub_height = sub_height;
return _cogl_sub_texture_handle_new (sub_tex);
}
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 gboolean
_cogl_sub_texture_is_sliced (CoglTexture *tex)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
return cogl_texture_is_sliced (sub_tex->full_texture);
}
static gboolean
_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 (sub_tex->sub_width ==
cogl_texture_get_width (sub_tex->full_texture) &&
sub_tex->sub_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 * sub_tex->sub_width + sub_tex->sub_x) /
cogl_texture_get_width (sub_tex->full_texture));
*t = ((*t * sub_tex->sub_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 gboolean
_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_set_filters (CoglTexture *tex,
GLenum min_filter,
GLenum mag_filter)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
_cogl_texture_set_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 gboolean
_cogl_sub_texture_set_region (CoglTexture *tex,
int src_x,
int src_y,
int dst_x,
int dst_y,
unsigned int dst_width,
unsigned int dst_height,
CoglBitmap *bmp)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
return cogl_texture_set_region_from_bitmap (sub_tex->full_texture,
src_x, src_y,
dst_x + sub_tex->sub_x,
dst_y + sub_tex->sub_y,
dst_width, dst_height,
bmp);
}
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_get_gl_format (sub_tex->full_texture);
}
static int
_cogl_sub_texture_get_width (CoglTexture *tex)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
return sub_tex->sub_width;
}
static int
_cogl_sub_texture_get_height (CoglTexture *tex)
{
CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
return sub_tex->sub_height;
}
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 =
{
_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_set_filters,
_cogl_sub_texture_pre_paint,
_cogl_sub_texture_ensure_non_quad_rendering,
_cogl_sub_texture_set_wrap_mode_parameters,
_cogl_sub_texture_get_format,
_cogl_sub_texture_get_gl_format,
_cogl_sub_texture_get_width,
_cogl_sub_texture_get_height,
_cogl_sub_texture_get_type,
NULL /* is_foreign */
};
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