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texture-2d-sliced: simplify _foreach_sub_texture_in_region

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Since we can assume that all slices are CoglTexture2D textures we don't
need to chain on our implementation of _foreach_sub_texture_in_region
by calling _cogl_texture_foreach_sub_texture_in_region() for each slice.

We now simply determine the normalized virtual coordinates for the
current span inline and call the given callback inline too.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
This commit is contained in:
Robert Bragg 2011-10-13 13:13:32 +01:00
parent 3c129f5c18
commit c7098e417d
1 changed files with 36 additions and 73 deletions
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109
cogl/cogl-texture-2d-sliced.c
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@ -56,42 +56,6 @@ COGL_TEXTURE_DEFINE (Texture2DSliced, texture_2d_sliced);
static const CoglTextureVtable cogl_texture_2d_sliced_vtable;
typedef struct
{
CoglTexture2DSliced *tex;
CoglSpan *x_span;
CoglSpan *y_span;
CoglTextureSliceCallback callback;
void *user_data;
} ForeachData;
static void
_cogl_texture_2d_sliced_foreach_cb (CoglTexture *texture,
const float *slice_coords,
const float *virtual_coords_in,
void *user_data)
{
float virtual_coords_out[4];
ForeachData *data = user_data;
/* Convert the virtual coordinates of the texture slice back to
coordinates in the space of the outer texture */
virtual_coords_out[0] = (virtual_coords_in[0] * data->x_span->size +
data->x_span->start) / data->tex->width;
virtual_coords_out[1] = (virtual_coords_in[1] * data->y_span->size +
data->y_span->start) / data->tex->height;
virtual_coords_out[2] = (virtual_coords_in[2] * data->x_span->size +
data->x_span->start) / data->tex->width;
virtual_coords_out[3] = (virtual_coords_in[3] * data->y_span->size +
data->y_span->start) / data->tex->height;
data->callback (texture,
slice_coords,
virtual_coords_out,
data->user_data);
}
/* To differentiate between texture coordinates of a specific, real, slice
* texture and the texture coordinates of the composite, sliced texture, the
* coordinates of the sliced texture are called "virtual" coordinates and the
@ -115,11 +79,7 @@ _cogl_texture_2d_sliced_foreach_sub_texture_in_region (
float height = tex_2ds->height;
CoglSpanIter iter_x;
CoglSpanIter iter_y;
ForeachData data;
data.tex = COGL_TEXTURE_2D_SLICED (tex);
data.callback = callback;
data.user_data = user_data;
float slice_coords[4];
/* Slice spans are stored in denormalized coordinates, and this is what
* the _cogl_span_iter_* funcs expect to be given, so we scale the given
@ -141,26 +101,24 @@ _cogl_texture_2d_sliced_foreach_sub_texture_in_region (
!_cogl_span_iter_end (&iter_y);
_cogl_span_iter_next (&iter_y))
{
float y_intersect_start = iter_y.intersect_start;
float y_intersect_end = iter_y.intersect_end;
float slice_ty1;
float slice_ty2;
if (iter_y.flipped)
{
y_intersect_start = iter_y.intersect_end;
y_intersect_end = iter_y.intersect_start;
slice_coords[1] = iter_y.intersect_end;
slice_coords[3] = iter_y.intersect_start;
}
else
{
slice_coords[1] = iter_y.intersect_start;
slice_coords[3] = iter_y.intersect_end;
}
/* Localize slice texture coordinates */
slice_ty1 = y_intersect_start - iter_y.pos;
slice_ty2 = y_intersect_end - iter_y.pos;
slice_coords[1] -= iter_y.pos;
slice_coords[3] -= iter_y.pos;
/* Normalize slice texture coordinates */
slice_ty1 /= iter_y.span->size;
slice_ty2 /= iter_y.span->size;
data.y_span = iter_y.span;
slice_coords[1] /= iter_y.span->size;
slice_coords[3] /= iter_y.span->size;
/* Iterate the x axis of the virtual rectangle */
for (_cogl_span_iter_begin (&iter_x,
@ -171,38 +129,43 @@ _cogl_texture_2d_sliced_foreach_sub_texture_in_region (
!_cogl_span_iter_end (&iter_x);
_cogl_span_iter_next (&iter_x))
{
float x_intersect_start = iter_x.intersect_start;
float x_intersect_end = iter_x.intersect_end;
float slice_tx1;
float slice_tx2;
CoglTexture2D *slice_tex;
float normalized_virtual_coords[4];
if (iter_x.flipped)
{
x_intersect_start = iter_x.intersect_end;
x_intersect_end = iter_x.intersect_start;
slice_coords[0] = iter_x.intersect_end;
slice_coords[2] = iter_x.intersect_start;
}
else
{
slice_coords[0] = iter_x.intersect_start;
slice_coords[2] = iter_x.intersect_end;
}
/* Localize slice texture coordinates */
slice_tx1 = x_intersect_start - iter_x.pos;
slice_tx2 = x_intersect_end - iter_x.pos;
slice_coords[0] -= iter_x.pos;
slice_coords[2] -= iter_x.pos;
/* Normalize slice texture coordinates */
slice_tx1 /= iter_x.span->size;
slice_tx2 /= iter_x.span->size;
data.x_span = iter_x.span;
slice_coords[0] /= iter_x.span->size;
slice_coords[2] /= iter_x.span->size;
/* Pluck out the cogl texture for this slice */
slice_tex = g_array_index (tex_2ds->slice_textures, CoglTexture2D *,
iter_y.index * iter_x.array->len +
iter_x.index);
iter_y.index *
tex_2ds->slice_x_spans->len +
iter_x.index);
_cogl_texture_foreach_sub_texture_in_region
(COGL_TEXTURE (slice_tex),
slice_tx1, slice_ty1, slice_tx2, slice_ty2,
_cogl_texture_2d_sliced_foreach_cb,
&data);
normalized_virtual_coords[0] = iter_x.intersect_start / width;
normalized_virtual_coords[1] = iter_y.intersect_start / height;
normalized_virtual_coords[2] = iter_x.intersect_end / width;
normalized_virtual_coords[3] = iter_y.intersect_end / height;
callback (COGL_TEXTURE (slice_tex),
slice_coords,
normalized_virtual_coords,
user_data);
}
}
}