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mutter/cogl/cogl-sub-texture.c
Robert Bragg 8326c71b6b texture: rename texobj flush code as gl specific 
This renames the set_filters and set_wrap_mode_parameters texture
virtual functions to gl_flush_legacy_texobj_filters and
gl_flush_legacy_texobj_wrap_modes respectively to clarify that they are
opengl driver specific and that they are only used to support the legacy
opengl apis for setting filters and wrap modes where the state is
associated with texture objects instead of being associated with sampler
objects.

This part of an effort to clearly delimit our abstraction over opengl so
that we can start to consider non-opengl backends for Cogl.

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

(cherry picked from commit 6f78b8a613340d7c6b736e51a16c625f52154430)
2013-01-22 17:47:58 +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-internal.h"
#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 <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_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, &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;
sub_tex->sub_width = sub_width;
sub_tex->sub_height = sub_height;
return _cogl_sub_texture_object_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 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 (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 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,
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 =
{
FALSE, /* not primitive */
_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_width,
_cogl_sub_texture_get_height,
_cogl_sub_texture_get_type,
NULL, /* is_foreign */
NULL /* set_auto_mipmap */
};
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