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mutter/cogl/cogl-sub-texture.c
Robert Bragg 1d8fd64e1c meta-texture: This publicly exposes CoglMetaTexture 
CoglMetaTexture is an interface for dealing with high level textures
that may be comprised of one or more low-level textures internally. The
interface allows the development of primitive drawing APIs that can draw
with high-level textures (such as atlas textures) even though the
GPU doesn't natively understand these texture types.

There is currently just one function that's part of this interface:
cogl_meta_texture_foreach_in_region() which allows an application to
resolve the internal, low-level textures of a high-level texture.
cogl_rectangle() uses this API for example so that it can easily emulate
the _REPEAT wrap mode for textures that the hardware can't natively
handle repeating of.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
2011-11-01 12:03:01 +00:00

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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2009,2010 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-handle.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_INTERNAL_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_handle_unref (sub_tex->next_texture);
cogl_handle_unref (sub_tex->full_texture);
/* Chain up */
_cogl_texture_free (COGL_TEXTURE (sub_tex));
}
CoglHandle
_cogl_sub_texture_new (CoglHandle next_texture,
int sub_x, int sub_y,
int sub_width, int sub_height)
{
CoglHandle 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 */
g_return_val_if_fail (sub_x >= 0 && sub_y >= 0, COGL_INVALID_HANDLE);
g_return_val_if_fail (sub_width > 0 && sub_height > 0, COGL_INVALID_HANDLE);
g_return_val_if_fail (sub_x + sub_width <= next_width, COGL_INVALID_HANDLE);
g_return_val_if_fail (sub_y + sub_height <= next_height, COGL_INVALID_HANDLE);
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_handle_ref (next_texture);
sub_tex->full_texture = cogl_handle_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);
}
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 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,
NULL /* is_foreign */
};
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