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;
}
}
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_texture_pixmap_x11_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)
{
CoglTexturePixmapX11 *tex_pixmap = COGL_TEXTURE_PIXMAP_X11 (tex);
CoglTexture *child_tex = _cogl_texture_pixmap_x11_get_texture (tex_pixmap);
/* Forward on to the child texture */
/* tfp textures may be implemented in terms of a
* CoglTextureRectangle texture which uses un-normalized texture
* coordinates but we want to consistently deal with normalized
* texture coordinates with CoglTexturePixmapX11... */
if (cogl_is_texture_rectangle (child_tex))
{
NormalizeCoordsWrapperData data;
int width = tex->width;
int height = tex->height;
virtual_tx_1 *= width;
virtual_ty_1 *= height;
virtual_tx_2 *= width;
virtual_ty_2 *= height;
data.width = width;
data.height = height;
data.callback = callback;
data.user_data = user_data;
cogl_meta_texture_foreach_in_region (COGL_META_TEXTURE (child_tex),
virtual_tx_1,
virtual_ty_1,
virtual_tx_2,
virtual_ty_2,
COGL_PIPELINE_WRAP_MODE_REPEAT,
COGL_PIPELINE_WRAP_MODE_REPEAT,
normalize_coords_wrapper_cb,
&data);
}
else
cogl_meta_texture_foreach_in_region (COGL_META_TEXTURE (child_tex),
virtual_tx_1,
virtual_ty_1,
virtual_tx_2,
virtual_ty_2,
COGL_PIPELINE_WRAP_MODE_REPEAT,
COGL_PIPELINE_WRAP_MODE_REPEAT,
callback,
user_data);
}
static void
texture_rectangle_check_cb (CoglTexture *sub_texture,
const float *sub_texture_coords,
const float *meta_coords,
void *user_data)
{
gboolean *result = user_data;
if (cogl_is_texture_rectangle (sub_texture))
*result = TRUE;
}
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);
}
}
void
cogl_meta_texture_foreach_in_region (CoglMetaTexture *meta_texture,
float tx_1,
float ty_1,
float tx_2,
float ty_2,
CoglPipelineWrapMode wrap_s,
CoglPipelineWrapMode wrap_t,
CoglMetaTextureCallback callback,
void *user_data)
{
CoglTexture *texture = COGL_TEXTURE (meta_texture);
float width = cogl_texture_get_width (texture);
float height = cogl_texture_get_height (texture);
NormalizeData normalize_data;
if (wrap_s == COGL_PIPELINE_WRAP_MODE_AUTOMATIC)
wrap_s = COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE;
if (wrap_t == COGL_PIPELINE_WRAP_MODE_AUTOMATIC)
wrap_t = COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE;
if (wrap_s == COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE ||
wrap_t == COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE)
{
CoglBool finished = foreach_clamped_region (meta_texture,
&tx_1, &ty_1, &tx_2, &ty_2,
wrap_s, wrap_t,
callback,
user_data);
if (finished)
return;
/* Since clamping has been handled we now want to normalize our
* wrap modes we se can assume from this point on we don't
* need to consider CLAMP_TO_EDGE. (NB: The spans code will
* assert that CLAMP_TO_EDGE isn't requested) */
if (wrap_s == COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE)
wrap_s = COGL_PIPELINE_WRAP_MODE_REPEAT;
if (wrap_t == COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE)
wrap_t = COGL_PIPELINE_WRAP_MODE_REPEAT;
}
/* It makes things simpler to deal with non-normalized region
* coordinates beyond this point and only re-normalize just before
* calling the user's callback... */
if (!cogl_is_texture_rectangle (COGL_TEXTURE (meta_texture)))
{
normalize_data.callback = callback;
normalize_data.user_data = user_data;
normalize_data.s_normalize_factor = 1.0f / width;
normalize_data.t_normalize_factor = 1.0f / height;
callback = normalize_meta_coords_cb;
user_data = &normalize_data;
tx_1 *= width;
ty_1 *= height;
tx_2 *= width;
ty_2 *= height;
}
/* XXX: at some point this wont be routed through the CoglTexture
* vtable, instead there will be a separate CoglMetaTexture
* interface vtable. */
if (texture->vtable->foreach_sub_texture_in_region)
{
ForeachData data;
data.meta_region_coords[0] = tx_1;
data.meta_region_coords[1] = ty_1;
data.meta_region_coords[2] = tx_2;
data.meta_region_coords[3] = ty_2;
data.wrap_s = wrap_s;
data.wrap_t = wrap_t;
data.callback = callback;
data.user_data = user_data;
data.width = width;
data.height = height;
memset (data.padded_textures, 0, sizeof (data.padded_textures));
/*
* 1) We iterate all the slices of the meta-texture only within
* the range [0,1].
*
* 2) We define a "padded grid" for each slice of the
* meta-texture in the range [0,1].
*
* The padded grid maps over the meta-texture coordinates in
* the range [0,1] but only contains one valid cell that
* corresponds to current slice being iterated and all the
* surrounding cells just provide padding.
*
* 3) Once we've defined our padded grid we then repeat that
* across the user's original region, calling their callback
* whenever we see our current slice - ignoring padding.
*
* A notable benefit of this design is that repeating a texture
* made of multiple slices will result in us repeating each
* slice in-turn so the user gets repeat callbacks for the same
* texture batched together. For manual emulation of texture
* repeats done by drawing geometry this makes it more likely
* that we can batch geometry.
*/
texture->vtable->foreach_sub_texture_in_region (texture,
0, 0, 1, 1,
create_grid_and_repeat_cb,
&data);
}
else
{
CoglSpan x_span = { 0, width, 0 };
CoglSpan y_span = { 0, height, 0 };
float meta_region_coords[4] = { tx_1, ty_1, tx_2, ty_2 };
UnNormalizeData un_normalize_data;
/* If we are dealing with a CoglTextureRectangle then we need a shim
* callback that un_normalizes the slice coordinates we get from
* _cogl_texture_spans_foreach_in_region before passing them to
* the user's callback. */
if (cogl_is_texture_rectangle (meta_texture))
{
un_normalize_data.callback = callback;
un_normalize_data.user_data = user_data;
un_normalize_data.width = width;
un_normalize_data.height = height;
callback = un_normalize_slice_coords_cb;
user_data = &un_normalize_data;
}
_cogl_texture_spans_foreach_in_region (&x_span, 1,
&y_span, 1,
&texture,
meta_region_coords,
width,
height,
wrap_s,
wrap_t,
callback,
user_data);
}
}
static CoglBool
foreach_clamped_region (CoglMetaTexture *meta_texture,
float *tx_1,
float *ty_1,
float *tx_2,
float *ty_2,
CoglPipelineWrapMode wrap_s,
CoglPipelineWrapMode wrap_t,
CoglMetaTextureCallback callback,
void *user_data)
{
float width = cogl_texture_get_width (COGL_TEXTURE (meta_texture));
ClampData clamp_data;
/* Consider that *tx_1 may be > *tx_2 and to simplify things
* we just flip them around if that's the case and keep a note
* of the fact that they are flipped. */
if (*tx_1 > *tx_2)
{
SWAP (*tx_1, *tx_2);
clamp_data.s_flipped = TRUE;
}
else
clamp_data.s_flipped = FALSE;
/* The same goes for ty_1 and ty_2... */
if (*ty_1 > *ty_2)
{
SWAP (*ty_1, *ty_2);
clamp_data.t_flipped = TRUE;
}
else
clamp_data.t_flipped = FALSE;
clamp_data.callback = callback;
clamp_data.user_data = user_data;
if (wrap_s == COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE)
{
float max_s_coord;
float half_texel_width;
/* Consider that rectangle textures have non-normalized
* coordinates... */
if (cogl_is_texture_rectangle (meta_texture))
max_s_coord = width;
else
max_s_coord = 1.0;
half_texel_width = max_s_coord / (width * 2);
/* Handle any left clamped region */
if (*tx_1 < 0)
{
clamp_data.start = *tx_1;
clamp_data.end = MIN (0, *tx_2);;
cogl_meta_texture_foreach_in_region (meta_texture,
half_texel_width, *ty_1,
half_texel_width, *ty_2,
COGL_PIPELINE_WRAP_MODE_REPEAT,
wrap_t,
clamp_s_cb,
&clamp_data);
/* Have we handled everything? */
if (tx_2 <= 0)
return TRUE;
/* clamp tx_1 since we've handled everything with x < 0 */
*tx_1 = 0;
}
/* Handle any right clamped region - including the corners */
if (*tx_2 > max_s_coord)
{
clamp_data.start = MAX (max_s_coord, *tx_1);
clamp_data.end = *tx_2;
cogl_meta_texture_foreach_in_region (meta_texture,
max_s_coord - half_texel_width,
*ty_1,
max_s_coord - half_texel_width,
*ty_2,
COGL_PIPELINE_WRAP_MODE_REPEAT,
wrap_t,
clamp_s_cb,
&clamp_data);
/* Have we handled everything? */
if (*tx_1 >= max_s_coord)
return TRUE;
/* clamp tx_2 since we've handled everything with x >
* max_s_coord */
*tx_2 = max_s_coord;
}
}
if (wrap_t == COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE)
{
float height = cogl_texture_get_height (COGL_TEXTURE (meta_texture));
float max_t_coord;
float half_texel_height;
/* Consider that rectangle textures have non-normalized
* coordinates... */
if (cogl_is_texture_rectangle (meta_texture))
max_t_coord = height;
else
max_t_coord = 1.0;
half_texel_height = max_t_coord / (height * 2);
/* Handle any top clamped region */
if (*ty_1 < 0)
{
clamp_data.start = *ty_1;
clamp_data.end = MIN (0, *ty_2);;
cogl_meta_texture_foreach_in_region (meta_texture,
*tx_1, half_texel_height,
*tx_2, half_texel_height,
wrap_s,
COGL_PIPELINE_WRAP_MODE_REPEAT,
clamp_t_cb,
&clamp_data);
/* Have we handled everything? */
if (tx_2 <= 0)
return TRUE;
/* clamp ty_1 since we've handled everything with y < 0 */
*ty_1 = 0;
}
/* Handle any bottom clamped region */
if (*ty_2 > max_t_coord)
{
clamp_data.start = MAX (max_t_coord, *ty_1);;
clamp_data.end = *ty_2;
cogl_meta_texture_foreach_in_region (meta_texture,
*tx_1,
max_t_coord - half_texel_height,
*tx_2,
max_t_coord - half_texel_height,
wrap_s,
COGL_PIPELINE_WRAP_MODE_REPEAT,
clamp_t_cb,
&clamp_data);
/* Have we handled everything? */
if (*ty_1 >= max_t_coord)
return TRUE;
/* clamp ty_2 since we've handled everything with y >
* max_t_coord */
*ty_2 = max_t_coord;
}
}
if (clamp_data.s_flipped)
SWAP (*tx_1, *tx_2);
if (clamp_data.t_flipped)
SWAP (*ty_1, *ty_2);
return FALSE;
}