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mutter/clutter/cogl/cogl/cogl-texture-2d-sliced.c
Neil Roberts 75f1dc90b0 cogl-material: Add support for setting the wrap mode for a layer 
Previously, Cogl's texture coordinate system was effectively always
GL_REPEAT so that if an application specifies coordinates outside the
range 0→1 it would get repeated copies of the texture. It would
however change the mode to GL_CLAMP_TO_EDGE if all of the coordinates
are in the range 0→1 so that in the common case that the whole texture
is being drawn with linear filtering it will not blend in edge pixels
from the opposite sides.

This patch adds the option for applications to change the wrap mode
per layer. There are now three wrap modes: 'repeat', 'clamp-to-edge'
and 'automatic'. The automatic map mode is the default and it
implements the previous behaviour. The wrap mode can be changed for
the s and t coordinates independently. I've tried to make the
internals support setting the r coordinate but as we don't support 3D
textures yet I haven't exposed any public API for it.

The texture backends still have a set_wrap_mode virtual but this value
is intended to be transitory and it will be changed whenever the
material is flushed (although the backends are expected to cache it so
that it won't use too many GL calls). In my understanding this value
was always meant to be transitory and all primitives were meant to set
the value before drawing. However there were comments suggesting that
this is not the expected behaviour. In particular the vertex buffer
drawing code never set a wrap mode so it would end up with whatever
the texture was previously used for. These issues are now fixed
because the material will always set the wrap modes.

There is code to manually implement clamp-to-edge for textures that
can't be hardware repeated. However this doesn't fully work because it
relies on being able to draw the stretched parts using quads with the
same values for tx1 and tx2. The texture iteration code doesn't
support this so it breaks. This is a separate bug and it isn't
trivially solved.

When flushing a material there are now extra options to set wrap mode
overrides. The overrides are an array of values for each layer that
specifies an override for the s, t or r coordinates. The primitives
use this to implement the automatic wrap mode. cogl_polygon also uses
it to set GL_CLAMP_TO_BORDER mode for its trick to render sliced
textures. Although this code has been added it looks like the sliced
trick has been broken for a while and I haven't attempted to fix it
here.

I've added a constant to represent the maximum number of layers that a
material supports so that I can size the overrides array. I've set it
to 32 because as far as I can tell we have that limit imposed anyway
because the other flush options use a guint32 to store a flag about
each layer. The overrides array ends up adding 32 bytes to each flush
options struct which may be a concern.

http://bugzilla.openedhand.com/show_bug.cgi?id=2063
2010-04-12 15:44:23 +01:00

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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2007,2008,2009 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:
* Matthew Allum <mallum@openedhand.com>
* Neil Roberts <neil@linux.intel.com>
* Robert Bragg <robert@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl.h"
#include "cogl-internal.h"
#include "cogl-util.h"
#include "cogl-bitmap.h"
#include "cogl-bitmap-private.h"
#include "cogl-texture-private.h"
#include "cogl-texture-2d-sliced-private.h"
#include "cogl-texture-driver.h"
#include "cogl-context.h"
#include "cogl-handle.h"
#include "cogl-spans.h"
#include "cogl-journal-private.h"
#include <string.h>
#include <stdlib.h>
#include <math.h>
static void _cogl_texture_2d_sliced_free (CoglTexture2DSliced *tex_2ds);
COGL_HANDLE_DEFINE (Texture2DSliced, texture_2d_sliced);
static const CoglTextureVtable cogl_texture_2d_sliced_vtable;
/* 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
* coordinates of slices are called "slice" coordinates. */
/* This function lets you iterate all the slices that lie within the given
* virtual coordinates of the parent sliced texture. */
/* Note: no guarantee is given about the order in which the slices will be
* visited */
static void
_cogl_texture_2d_sliced_foreach_sub_texture_in_region (
CoglTexture *tex,
float virtual_tx_1,
float virtual_ty_1,
float virtual_tx_2,
float virtual_ty_2,
CoglTextureSliceCallback callback,
void *user_data)
{
CoglTexture2DSliced *tex_2ds = COGL_TEXTURE_2D_SLICED (tex);
float width = tex_2ds->width;
float height = tex_2ds->height;
CoglSpanIter iter_x;
CoglSpanIter iter_y;
/* 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
* virtual coordinates by the texture size to denormalize.
*/
/* XXX: I wonder if it's worth changing how we store spans so we can avoid
* the need to denormalize here */
virtual_tx_1 *= width;
virtual_ty_1 *= height;
virtual_tx_2 *= width;
virtual_ty_2 *= height;
/* Iterate the y axis of the virtual rectangle */
for (_cogl_span_iter_begin (&iter_y,
tex_2ds->slice_y_spans,
height,
virtual_ty_1,
virtual_ty_2);
!_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;
/* Discard slices out of rectangle early */
if (!iter_y.intersects)
continue;
if (iter_y.flipped)
{
y_intersect_start = iter_y.intersect_end;
y_intersect_end = iter_y.intersect_start;
}
/* Localize slice texture coordinates */
slice_ty1 = y_intersect_start - iter_y.pos;
slice_ty2 = y_intersect_end - iter_y.pos;
if (tex_2ds->gl_target == GL_TEXTURE_2D)
{
/* Normalize slice texture coordinates */
slice_ty1 /= iter_y.span->size;
slice_ty2 /= iter_y.span->size;
}
/* Iterate the x axis of the virtual rectangle */
for (_cogl_span_iter_begin (&iter_x,
tex_2ds->slice_x_spans,
width,
virtual_tx_1,
virtual_tx_2);
!_cogl_span_iter_end (&iter_x);
_cogl_span_iter_next (&iter_x))
{
float slice_coords[4];
float virtual_coords[4];
float x_intersect_start = iter_x.intersect_start;
float x_intersect_end = iter_x.intersect_end;
float slice_tx1;
float slice_tx2;
GLuint gl_handle;
/* Discard slices out of rectangle early */
if (!iter_x.intersects)
continue;
if (iter_x.flipped)
{
x_intersect_start = iter_x.intersect_end;
x_intersect_end = iter_x.intersect_start;
}
/* Localize slice texture coordinates */
slice_tx1 = x_intersect_start - iter_x.pos;
slice_tx2 = x_intersect_end - iter_x.pos;
/* Pluck out opengl texture object for this slice */
gl_handle = g_array_index (tex_2ds->slice_gl_handles, GLuint,
iter_y.index * iter_x.array->len +
iter_x.index);
if (tex_2ds->gl_target == GL_TEXTURE_2D)
{
/* Normalize slice texture coordinates */
slice_tx1 /= iter_x.span->size;
slice_tx2 /= iter_x.span->size;
}
slice_coords[0] = slice_tx1;
slice_coords[1] = slice_ty1;
slice_coords[2] = slice_tx2;
slice_coords[3] = slice_ty2;
virtual_coords[0] = x_intersect_start / width;
virtual_coords[1] = y_intersect_start / height;
virtual_coords[2] = x_intersect_end / width;
virtual_coords[3] = y_intersect_end / height;
callback (tex,
gl_handle,
tex_2ds->gl_target,
slice_coords,
virtual_coords,
user_data);
}
}
}
static guint8 *
_cogl_texture_2d_sliced_allocate_waste_buffer (CoglTexture2DSliced *tex_2ds,
CoglPixelFormat format)
{
CoglSpan *last_x_span;
CoglSpan *last_y_span;
guint8 *waste_buf = NULL;
/* If the texture has any waste then allocate a buffer big enough to
fill the gaps */
last_x_span = &g_array_index (tex_2ds->slice_x_spans, CoglSpan,
tex_2ds->slice_x_spans->len - 1);
last_y_span = &g_array_index (tex_2ds->slice_y_spans, CoglSpan,
tex_2ds->slice_y_spans->len - 1);
if (last_x_span->waste > 0 || last_y_span->waste > 0)
{
int bpp = _cogl_get_format_bpp (format);
CoglSpan *first_x_span
= &g_array_index (tex_2ds->slice_x_spans, CoglSpan, 0);
CoglSpan *first_y_span
= &g_array_index (tex_2ds->slice_y_spans, CoglSpan, 0);
unsigned int right_size = first_y_span->size * last_x_span->waste;
unsigned int bottom_size = first_x_span->size * last_y_span->waste;
waste_buf = g_malloc (MAX (right_size, bottom_size) * bpp);
}
return waste_buf;
}
static gboolean
_cogl_texture_2d_sliced_upload_to_gl (CoglTexture2DSliced *tex_2ds,
CoglBitmap *bmp,
GLenum gl_intformat,
GLenum gl_format,
GLenum gl_type)
{
CoglSpan *x_span;
CoglSpan *y_span;
GLuint gl_handle;
int bpp;
int x, y;
guint8 *waste_buf;
bpp = _cogl_get_format_bpp (bmp->format);
waste_buf = _cogl_texture_2d_sliced_allocate_waste_buffer (tex_2ds,
bmp->format);
/* Iterate vertical slices */
for (y = 0; y < tex_2ds->slice_y_spans->len; ++y)
{
y_span = &g_array_index (tex_2ds->slice_y_spans, CoglSpan, y);
/* Iterate horizontal slices */
for (x = 0; x < tex_2ds->slice_x_spans->len; ++x)
{
int slice_num = y * tex_2ds->slice_x_spans->len + x;
x_span = &g_array_index (tex_2ds->slice_x_spans, CoglSpan, x);
/* Pick the gl texture object handle */
gl_handle = g_array_index (tex_2ds->slice_gl_handles, GLuint, slice_num);
_cogl_texture_driver_upload_subregion_to_gl (
tex_2ds->gl_target,
gl_handle,
x_span->start, /* src x */
y_span->start, /* src y */
0, /* dst x */
0, /* dst y */
x_span->size - x_span->waste, /* width */
y_span->size - y_span->waste, /* height */
bmp,
gl_format,
gl_type);
/* Keep a copy of the first pixel if needed */
if (tex_2ds->first_pixels)
{
memcpy (tex_2ds->first_pixels[slice_num].data,
bmp->data + x_span->start * bpp
+ y_span->start * bmp->rowstride,
bpp);
tex_2ds->first_pixels[slice_num].gl_format = gl_format;
tex_2ds->first_pixels[slice_num].gl_type = gl_type;
}
/* Fill the waste with a copies of the rightmost pixels */
if (x_span->waste > 0)
{
const guint8 *src = bmp->data
+ y_span->start * bmp->rowstride
+ (x_span->start + x_span->size - x_span->waste - 1) * bpp;
guint8 *dst = waste_buf;
unsigned int wx, wy;
for (wy = 0; wy < y_span->size - y_span->waste; wy++)
{
for (wx = 0; wx < x_span->waste; wx++)
{
memcpy (dst, src, bpp);
dst += bpp;
}
src += bmp->rowstride;
}
_cogl_texture_driver_prep_gl_for_pixels_upload (
x_span->waste * bpp,
bpp);
GE( glTexSubImage2D (tex_2ds->gl_target, 0,
x_span->size - x_span->waste,
0,
x_span->waste,
y_span->size - y_span->waste,
gl_format, gl_type,
waste_buf) );
}
if (y_span->waste > 0)
{
const guint8 *src = bmp->data
+ ((y_span->start + y_span->size - y_span->waste - 1)
* bmp->rowstride)
+ x_span->start * bpp;
guint8 *dst = waste_buf;
unsigned int wy, wx;
for (wy = 0; wy < y_span->waste; wy++)
{
memcpy (dst, src, (x_span->size - x_span->waste) * bpp);
dst += (x_span->size - x_span->waste) * bpp;
for (wx = 0; wx < x_span->waste; wx++)
{
memcpy (dst, dst - bpp, bpp);
dst += bpp;
}
}
_cogl_texture_driver_prep_gl_for_pixels_upload (
x_span->size * bpp,
bpp);
GE( glTexSubImage2D (tex_2ds->gl_target, 0,
0,
y_span->size - y_span->waste,
x_span->size,
y_span->waste,
gl_format, gl_type,
waste_buf) );
}
}
}
if (waste_buf)
g_free (waste_buf);
tex_2ds->mipmaps_dirty = TRUE;
return TRUE;
}
static gboolean
_cogl_texture_2d_sliced_upload_subregion_to_gl (CoglTexture2DSliced *tex_2ds,
int src_x,
int src_y,
int dst_x,
int dst_y,
int width,
int height,
CoglBitmap *source_bmp,
GLuint source_gl_format,
GLuint source_gl_type)
{
CoglSpan *x_span;
CoglSpan *y_span;
int bpp;
CoglSpanIter x_iter;
CoglSpanIter y_iter;
GLuint gl_handle;
int source_x = 0, source_y = 0;
int inter_w = 0, inter_h = 0;
int local_x = 0, local_y = 0;
guint8 *waste_buf;
bpp = _cogl_get_format_bpp (source_bmp->format);
waste_buf =
_cogl_texture_2d_sliced_allocate_waste_buffer (tex_2ds, source_bmp->format);
/* Iterate vertical spans */
for (source_y = src_y,
_cogl_span_iter_begin (&y_iter,
tex_2ds->slice_y_spans,
tex_2ds->height,
dst_y,
dst_y + height);
!_cogl_span_iter_end (&y_iter);
_cogl_span_iter_next (&y_iter),
source_y += inter_h )
{
/* Discard slices out of the subregion early */
if (!y_iter.intersects)
{
inter_h = 0;
continue;
}
y_span = &g_array_index (tex_2ds->slice_y_spans, CoglSpan,
y_iter.index);
/* Iterate horizontal spans */
for (source_x = src_x,
_cogl_span_iter_begin (&x_iter,
tex_2ds->slice_x_spans,
tex_2ds->width,
dst_x,
dst_x + width);
!_cogl_span_iter_end (&x_iter);
_cogl_span_iter_next (&x_iter),
source_x += inter_w )
{
int slice_num;
/* Discard slices out of the subregion early */
if (!x_iter.intersects)
{
inter_w = 0;
continue;
}
x_span = &g_array_index (tex_2ds->slice_x_spans, CoglSpan,
x_iter.index);
/* Pick intersection width and height */
inter_w = (x_iter.intersect_end - x_iter.intersect_start);
inter_h = (y_iter.intersect_end - y_iter.intersect_start);
/* Localize intersection top-left corner to slice*/
local_x = (x_iter.intersect_start - x_iter.pos);
local_y = (y_iter.intersect_start - y_iter.pos);
slice_num = y_iter.index * tex_2ds->slice_x_spans->len + x_iter.index;
/* Pick slice GL handle */
gl_handle = g_array_index (tex_2ds->slice_gl_handles, GLuint, slice_num);
_cogl_texture_driver_upload_subregion_to_gl (tex_2ds->gl_target,
gl_handle,
source_x,
source_y,
local_x, /* dst x */
local_y, /* dst x */
inter_w, /* width */
inter_h, /* height */
source_bmp,
source_gl_format,
source_gl_type);
/* Keep a copy of the first pixel if needed */
if (tex_2ds->first_pixels && local_x == 0 && local_y == 0)
{
memcpy (tex_2ds->first_pixels[slice_num].data,
source_bmp->data + source_x * bpp
+ source_y * source_bmp->rowstride,
bpp);
tex_2ds->first_pixels[slice_num].gl_format = source_gl_format;
tex_2ds->first_pixels[slice_num].gl_type = source_gl_type;
}
/* If the x_span is sliced and the upload touches the
rightmost pixels then fill the waste with copies of the
pixels */
if (x_span->waste > 0
&& local_x < x_span->size - x_span->waste
&& local_x + inter_w >= x_span->size - x_span->waste)
{
const guint8 *src;
guint8 *dst;
unsigned int wx, wy;
src = source_bmp->data
+ (src_y + ((int)y_iter.intersect_start)
- dst_y)
* source_bmp->rowstride
+ (src_x + x_span->start + x_span->size - x_span->waste
- dst_x - 1)
* bpp;
dst = waste_buf;
for (wy = 0; wy < inter_h; wy++)
{
for (wx = 0; wx < x_span->waste; wx++)
{
memcpy (dst, src, bpp);
dst += bpp;
}
src += source_bmp->rowstride;
}
_cogl_texture_driver_prep_gl_for_pixels_upload (
x_span->waste * bpp,
bpp);
GE( glTexSubImage2D (tex_2ds->gl_target, 0,
x_span->size - x_span->waste,
local_y,
x_span->waste,
inter_h,
source_gl_format,
source_gl_type,
waste_buf) );
}
/* same for the bottom-most pixels */
if (y_span->waste > 0
&& local_y < y_span->size - y_span->waste
&& local_y + inter_h >= y_span->size - y_span->waste)
{
const guint8 *src;
guint8 *dst;
unsigned int wy, wx;
unsigned int copy_width;
src = source_bmp->data
+ (src_x + ((int)x_iter.intersect_start)
- dst_x)
* bpp
+ (src_y + y_span->start + y_span->size - y_span->waste
- dst_y - 1)
* source_bmp->rowstride;
dst = waste_buf;
if (local_x + inter_w >= x_span->size - x_span->waste)
copy_width = x_span->size - local_x;
else
copy_width = inter_w;
for (wy = 0; wy < y_span->waste; wy++)
{
memcpy (dst, src, inter_w * bpp);
dst += inter_w * bpp;
for (wx = inter_w; wx < copy_width; wx++)
{
memcpy (dst, dst - bpp, bpp);
dst += bpp;
}
}
_cogl_texture_driver_prep_gl_for_pixels_upload (
copy_width * bpp,
bpp);
GE( glTexSubImage2D (tex_2ds->gl_target, 0,
local_x,
y_span->size - y_span->waste,
copy_width,
y_span->waste,
source_gl_format,
source_gl_type,
waste_buf) );
}
}
}
if (waste_buf)
g_free (waste_buf);
tex_2ds->mipmaps_dirty = TRUE;
return TRUE;
}
static int
_cogl_rect_slices_for_size (int size_to_fill,
int max_span_size,
int max_waste,
GArray *out_spans)
{
int n_spans = 0;
CoglSpan span;
/* Init first slice span */
span.start = 0;
span.size = max_span_size;
span.waste = 0;
/* Repeat until whole area covered */
while (size_to_fill >= span.size)
{
/* Add another slice span of same size */
if (out_spans)
g_array_append_val (out_spans, span);
span.start += span.size;
size_to_fill -= span.size;
n_spans++;
}
/* Add one last smaller slice span */
if (size_to_fill > 0)
{
span.size = size_to_fill;
if (out_spans)
g_array_append_val (out_spans, span);
n_spans++;
}
return n_spans;
}
static int
_cogl_pot_slices_for_size (int size_to_fill,
int max_span_size,
int max_waste,
GArray *out_spans)
{
int n_spans = 0;
CoglSpan span;
/* Init first slice span */
span.start = 0;
span.size = max_span_size;
span.waste = 0;
/* Fix invalid max_waste */
if (max_waste < 0)
max_waste = 0;
while (TRUE)
{
/* Is the whole area covered? */
if (size_to_fill > span.size)
{
/* Not yet - add a span of this size */
if (out_spans)
g_array_append_val (out_spans, span);
span.start += span.size;
size_to_fill -= span.size;
n_spans++;
}
else if (span.size - size_to_fill <= max_waste)
{
/* Yes and waste is small enough */
span.waste = span.size - size_to_fill;
if (out_spans)
g_array_append_val (out_spans, span);
return ++n_spans;
}
else
{
/* Yes but waste is too large */
while (span.size - size_to_fill > max_waste)
{
span.size /= 2;
g_assert (span.size > 0);
}
}
}
/* Can't get here */
return 0;
}
static void
_cogl_texture_2d_sliced_set_wrap_mode_parameters (CoglTexture *tex,
GLenum wrap_mode_s,
GLenum wrap_mode_t,
GLenum wrap_mode_r)
{
CoglTexture2DSliced *tex_2ds = COGL_TEXTURE_2D_SLICED (tex);
/* Only set the wrap mode if it's different from the current value
to avoid too many GL calls. Texture 2D doesn't make use of the r
coordinate so we can ignore its wrap mode */
if (tex_2ds->wrap_mode_s != wrap_mode_s ||
tex_2ds->wrap_mode_t != wrap_mode_t)
{
int i;
for (i = 0; i < tex_2ds->slice_gl_handles->len; i++)
{
GLuint texnum = g_array_index (tex_2ds->slice_gl_handles, GLuint, i);
GE( glBindTexture (tex_2ds->gl_target, texnum) );
GE( glTexParameteri (tex_2ds->gl_target,
GL_TEXTURE_WRAP_S, wrap_mode_s) );
GE( glTexParameteri (tex_2ds->gl_target,
GL_TEXTURE_WRAP_T, wrap_mode_t) );
}
tex_2ds->wrap_mode_s = wrap_mode_s;
tex_2ds->wrap_mode_t = wrap_mode_t;
}
}
static gboolean
_cogl_texture_2d_sliced_slices_create (CoglTexture2DSliced *tex_2ds,
int width, int height,
GLenum gl_intformat,
GLenum gl_format,
GLenum gl_type)
{
int max_width;
int max_height;
GLuint *gl_handles;
int n_x_slices;
int n_y_slices;
int n_slices;
int x, y;
CoglSpan *x_span;
CoglSpan *y_span;
const GLfloat transparent_color[4] = { 0x00, 0x00, 0x00, 0x00 };
int (*slices_for_size) (int, int, int, GArray*);
/* Initialize size of largest slice according to supported features */
if (cogl_features_available (COGL_FEATURE_TEXTURE_NPOT))
{
max_width = width;
max_height = height;
tex_2ds->gl_target = GL_TEXTURE_2D;
slices_for_size = _cogl_rect_slices_for_size;
}
else
{
max_width = cogl_util_next_p2 (width);
max_height = cogl_util_next_p2 (height);
tex_2ds->gl_target = GL_TEXTURE_2D;
slices_for_size = _cogl_pot_slices_for_size;
}
/* Negative number means no slicing forced by the user */
if (tex_2ds->max_waste <= -1)
{
CoglSpan span;
/* Check if size supported else bail out */
if (!_cogl_texture_driver_size_supported (tex_2ds->gl_target,
gl_intformat,
gl_type,
max_width,
max_height))
{
return FALSE;
}
n_x_slices = 1;
n_y_slices = 1;
/* Init span arrays */
tex_2ds->slice_x_spans = g_array_sized_new (FALSE, FALSE,
sizeof (CoglSpan),
1);
tex_2ds->slice_y_spans = g_array_sized_new (FALSE, FALSE,
sizeof (CoglSpan),
1);
/* Add a single span for width and height */
span.start = 0;
span.size = max_width;
span.waste = max_width - width;
g_array_append_val (tex_2ds->slice_x_spans, span);
span.size = max_height;
span.waste = max_height - height;
g_array_append_val (tex_2ds->slice_y_spans, span);
}
else
{
/* Decrease the size of largest slice until supported by GL */
while (!_cogl_texture_driver_size_supported (tex_2ds->gl_target,
gl_intformat,
gl_type,
max_width,
max_height))
{
/* Alternate between width and height */
if (max_width > max_height)
max_width /= 2;
else
max_height /= 2;
if (max_width == 0 || max_height == 0)
return FALSE;
}
/* Determine the slices required to cover the bitmap area */
n_x_slices = slices_for_size (width,
max_width, tex_2ds->max_waste,
NULL);
n_y_slices = slices_for_size (height,
max_height, tex_2ds->max_waste,
NULL);
/* Init span arrays with reserved size */
tex_2ds->slice_x_spans = g_array_sized_new (FALSE, FALSE,
sizeof (CoglSpan),
n_x_slices);
tex_2ds->slice_y_spans = g_array_sized_new (FALSE, FALSE,
sizeof (CoglSpan),
n_y_slices);
/* Fill span arrays with info */
slices_for_size (width,
max_width, tex_2ds->max_waste,
tex_2ds->slice_x_spans);
slices_for_size (height,
max_height, tex_2ds->max_waste,
tex_2ds->slice_y_spans);
}
/* Init and resize GL handle array */
n_slices = n_x_slices * n_y_slices;
tex_2ds->slice_gl_handles = g_array_sized_new (FALSE, FALSE,
sizeof (GLuint),
n_slices);
g_array_set_size (tex_2ds->slice_gl_handles, n_slices);
/* Allocate some space to store a copy of the first pixel of each
slice. This is only needed if glGenerateMipmap (which is part of
the FBO extension) is not available */
if (cogl_features_available (COGL_FEATURE_OFFSCREEN))
tex_2ds->first_pixels = NULL;
else
tex_2ds->first_pixels = g_new (CoglTexturePixel, n_slices);
/* Wrap mode not yet set */
tex_2ds->wrap_mode_s = GL_FALSE;
tex_2ds->wrap_mode_t = GL_FALSE;
/* Generate a "working set" of GL texture objects
* (some implementations might supported faster
* re-binding between textures inside a set) */
gl_handles = (GLuint*) tex_2ds->slice_gl_handles->data;
_cogl_texture_driver_gen (GL_TEXTURE_2D, n_slices, gl_handles);
/* Init each GL texture object */
for (y = 0; y < n_y_slices; ++y)
{
y_span = &g_array_index (tex_2ds->slice_y_spans, CoglSpan, y);
for (x = 0; x < n_x_slices; ++x)
{
x_span = &g_array_index (tex_2ds->slice_x_spans, CoglSpan, x);
COGL_NOTE (SLICING, "CREATE SLICE (%d,%d)\tsize (%d,%d)",
x, y,
x_span->size - x_span->waste,
y_span->size - y_span->waste);
/* Setup texture parameters */
GE( glBindTexture (tex_2ds->gl_target,
gl_handles[y * n_x_slices + x] ) );
_cogl_texture_driver_try_setting_gl_border_color (tex_2ds->gl_target,
transparent_color);
/* Pass NULL data to init size and internal format */
GE( glTexImage2D (tex_2ds->gl_target, 0, gl_intformat,
x_span->size, y_span->size, 0,
gl_format, gl_type, 0) );
}
}
return TRUE;
}
static void
_cogl_texture_2d_sliced_slices_free (CoglTexture2DSliced *tex_2ds)
{
if (tex_2ds->slice_x_spans != NULL)
g_array_free (tex_2ds->slice_x_spans, TRUE);
if (tex_2ds->slice_y_spans != NULL)
g_array_free (tex_2ds->slice_y_spans, TRUE);
if (tex_2ds->slice_gl_handles != NULL)
{
if (tex_2ds->is_foreign == FALSE)
{
GE( glDeleteTextures (tex_2ds->slice_gl_handles->len,
(GLuint*) tex_2ds->slice_gl_handles->data) );
}
g_array_free (tex_2ds->slice_gl_handles, TRUE);
}
if (tex_2ds->first_pixels != NULL)
g_free (tex_2ds->first_pixels);
}
static void
_cogl_texture_2d_sliced_free (CoglTexture2DSliced *tex_2ds)
{
_cogl_texture_2d_sliced_slices_free (tex_2ds);
g_free (tex_2ds);
}
static gboolean
_cogl_texture_2d_sliced_upload_from_data
(CoglTexture2DSliced *tex_2ds,
CoglBitmap *bmp,
CoglPixelFormat internal_format)
{
CoglTexture *tex = COGL_TEXTURE (tex_2ds);
GLenum gl_intformat;
GLenum gl_format;
GLenum gl_type;
tex->vtable = &cogl_texture_2d_sliced_vtable;
tex_2ds->is_foreign = FALSE;
tex_2ds->auto_mipmap = FALSE;
tex_2ds->mipmaps_dirty = TRUE;
tex_2ds->first_pixels = NULL;
tex_2ds->slice_x_spans = NULL;
tex_2ds->slice_y_spans = NULL;
tex_2ds->slice_gl_handles = NULL;
/* We default to GL_LINEAR for both filters */
tex_2ds->min_filter = GL_LINEAR;
tex_2ds->mag_filter = GL_LINEAR;
if (bmp->data)
{
CoglBitmap dst_bmp;
gboolean dst_bmp_owner;
if (!_cogl_texture_prepare_for_upload (bmp,
internal_format,
&internal_format,
&dst_bmp,
&dst_bmp_owner,
&gl_intformat,
&gl_format,
&gl_type))
return FALSE;
/* Create slices for the given format and size */
if (!_cogl_texture_2d_sliced_slices_create (tex_2ds,
bmp->width,
bmp->height,
gl_intformat,
gl_format,
gl_type))
{
if (dst_bmp_owner)
g_free (dst_bmp.data);
return FALSE;
}
if (!_cogl_texture_2d_sliced_upload_to_gl (tex_2ds,
bmp,
gl_intformat,
gl_format,
gl_type))
{
if (dst_bmp_owner)
g_free (dst_bmp.data);
return FALSE;
}
if (dst_bmp_owner)
g_free (dst_bmp.data);
}
else
{
/* Find closest GL format match */
_cogl_pixel_format_to_gl (internal_format,
&gl_intformat,
&gl_format,
&gl_type);
/* Create slices for the given format and size */
if (!_cogl_texture_2d_sliced_slices_create (tex_2ds,
bmp->width,
bmp->height,
gl_intformat,
gl_format,
gl_type))
return FALSE;
}
tex_2ds->gl_format = gl_intformat;
tex_2ds->width = bmp->width;
tex_2ds->height = bmp->height;
tex_2ds->format = bmp->format;
return TRUE;
}
CoglHandle
_cogl_texture_2d_sliced_new_with_size (unsigned int width,
unsigned int height,
CoglTextureFlags flags,
CoglPixelFormat internal_format)
{
CoglTexture2DSliced *tex_2ds;
CoglBitmap bmp;
/* Since no data, we need some internal format */
if (internal_format == COGL_PIXEL_FORMAT_ANY)
internal_format = COGL_PIXEL_FORMAT_RGBA_8888_PRE;
/* Init texture with empty bitmap */
tex_2ds = g_new (CoglTexture2DSliced, 1);
bmp.width = width;
bmp.height = height;
bmp.data = NULL;
if ((flags & COGL_TEXTURE_NO_SLICING))
tex_2ds->max_waste = -1;
else
tex_2ds->max_waste = COGL_TEXTURE_MAX_WASTE;
if (!_cogl_texture_2d_sliced_upload_from_data (tex_2ds, &bmp,
internal_format))
{
_cogl_texture_2d_sliced_free (tex_2ds);
return COGL_INVALID_HANDLE;
}
tex_2ds->auto_mipmap = (flags & COGL_TEXTURE_NO_AUTO_MIPMAP) == 0;
return _cogl_texture_2d_sliced_handle_new (tex_2ds);
}
CoglHandle
_cogl_texture_2d_sliced_new_from_bitmap (CoglHandle bmp_handle,
CoglTextureFlags flags,
CoglPixelFormat internal_format)
{
CoglTexture2DSliced *tex_2ds;
CoglBitmap *bmp = (CoglBitmap *)bmp_handle;
g_return_val_if_fail (bmp_handle != COGL_INVALID_HANDLE, COGL_INVALID_HANDLE);
/* Create new texture and fill with loaded data */
tex_2ds = g_new0 (CoglTexture2DSliced, 1);
if (flags & COGL_TEXTURE_NO_SLICING)
tex_2ds->max_waste = -1;
else
tex_2ds->max_waste = COGL_TEXTURE_MAX_WASTE;
/* FIXME: If upload fails we should set some kind of
* error flag but still return texture handle if the
* user decides to destroy another texture and upload
* this one instead (reloading from file is not needed
* in that case). As a rule then, everytime a valid
* CoglHandle is returned, it should also be destroyed
* with cogl_handle_unref at some point! */
if (!_cogl_texture_2d_sliced_upload_from_data (tex_2ds, bmp,
internal_format))
{
_cogl_texture_2d_sliced_free (tex_2ds);
return COGL_INVALID_HANDLE;
}
tex_2ds->auto_mipmap = (flags & COGL_TEXTURE_NO_AUTO_MIPMAP) == 0;
return _cogl_texture_2d_sliced_handle_new (tex_2ds);
}
CoglHandle
_cogl_texture_2d_sliced_new_from_foreign (GLuint gl_handle,
GLenum gl_target,
GLuint width,
GLuint height,
GLuint x_pot_waste,
GLuint y_pot_waste,
CoglPixelFormat format)
{
/* NOTE: width, height and internal format are not queriable
* in GLES, hence such a function prototype.
*/
GLenum gl_error = 0;
GLboolean gl_istexture;
GLint gl_compressed = GL_FALSE;
GLint gl_int_format = 0;
GLint gl_width = 0;
GLint gl_height = 0;
GLint gl_gen_mipmap;
CoglTexture2DSliced *tex_2ds;
CoglTexture *tex;
CoglSpan x_span;
CoglSpan y_span;
if (!_cogl_texture_driver_allows_foreign_gl_target (gl_target))
return COGL_INVALID_HANDLE;
#if HAVE_COGL_GL
/* It shouldn't be necissary to have waste in this case since
* the texture isn't limited to power of two sizes. */
if (gl_target == GL_TEXTURE_RECTANGLE_ARB &&
(x_pot_waste != 0 || y_pot_waste != 0))
{
g_warning ("You can't create a foreign GL_TEXTURE_RECTANGLE cogl "
"texture with waste\n");
return COGL_INVALID_HANDLE;
}
#endif
/* Make sure it is a valid GL texture object */
gl_istexture = glIsTexture (gl_handle);
if (gl_istexture == GL_FALSE)
return COGL_INVALID_HANDLE;
/* Make sure binding succeeds */
while ((gl_error = glGetError ()) != GL_NO_ERROR)
;
glBindTexture (gl_target, gl_handle);
if (glGetError () != GL_NO_ERROR)
return COGL_INVALID_HANDLE;
/* Obtain texture parameters
(only level 0 we are interested in) */
#if HAVE_COGL_GL
GE( glGetTexLevelParameteriv (gl_target, 0,
GL_TEXTURE_COMPRESSED,
&gl_compressed) );
GE( glGetTexLevelParameteriv (gl_target, 0,
GL_TEXTURE_INTERNAL_FORMAT,
&gl_int_format) );
#endif
/* Note: We always trust the given width and height without querying
* the texture object because the user may be creating a Cogl
* texture for a texture_from_pixmap object where glTexImage2D may
* not have been called and the texture_from_pixmap spec doesn't
* clarify that it is reliable to query back the size from OpenGL.
*/
gl_width = width + x_pot_waste;
gl_height = height + y_pot_waste;
GE( glGetTexParameteriv (gl_target,
GL_GENERATE_MIPMAP,
&gl_gen_mipmap) );
/* Validate width and height */
if (gl_width <= 0 || gl_height <= 0)
return COGL_INVALID_HANDLE;
/* Validate pot waste */
if (x_pot_waste < 0 || x_pot_waste >= gl_width ||
y_pot_waste < 0 || y_pot_waste >= gl_height)
return COGL_INVALID_HANDLE;
/* Compressed texture images not supported */
if (gl_compressed == GL_TRUE)
return COGL_INVALID_HANDLE;
/* Try and match to a cogl format */
if (!_cogl_pixel_format_from_gl_internal (gl_int_format, &format))
return COGL_INVALID_HANDLE;
/* Create new texture */
tex_2ds = g_new0 (CoglTexture2DSliced, 1);
tex = COGL_TEXTURE (tex_2ds);
tex->vtable = &cogl_texture_2d_sliced_vtable;
/* Setup bitmap info */
tex_2ds->is_foreign = TRUE;
tex_2ds->auto_mipmap = (gl_gen_mipmap == GL_TRUE) ? TRUE : FALSE;
tex_2ds->mipmaps_dirty = TRUE;
tex_2ds->first_pixels = NULL;
tex_2ds->format = format;
tex_2ds->width = gl_width - x_pot_waste;
tex_2ds->height = gl_height - y_pot_waste;
tex_2ds->gl_target = gl_target;
tex_2ds->gl_format = gl_int_format;
/* Unknown filter */
tex_2ds->min_filter = GL_FALSE;
tex_2ds->mag_filter = GL_FALSE;
tex_2ds->max_waste = 0;
/* Wrap mode not yet set */
tex_2ds->wrap_mode_s = GL_FALSE;
tex_2ds->wrap_mode_t = GL_FALSE;
/* Create slice arrays */
tex_2ds->slice_x_spans =
g_array_sized_new (FALSE, FALSE,
sizeof (CoglSpan), 1);
tex_2ds->slice_y_spans =
g_array_sized_new (FALSE, FALSE,
sizeof (CoglSpan), 1);
tex_2ds->slice_gl_handles =
g_array_sized_new (FALSE, FALSE,
sizeof (GLuint), 1);
/* Store info for a single slice */
x_span.start = 0;
x_span.size = gl_width;
x_span.waste = x_pot_waste;
g_array_append_val (tex_2ds->slice_x_spans, x_span);
y_span.start = 0;
y_span.size = gl_height;
y_span.waste = y_pot_waste;
g_array_append_val (tex_2ds->slice_y_spans, y_span);
g_array_append_val (tex_2ds->slice_gl_handles, gl_handle);
tex_2ds->first_pixels = NULL;
return _cogl_texture_2d_sliced_handle_new (tex_2ds);
}
static int
_cogl_texture_2d_sliced_get_max_waste (CoglTexture *tex)
{
CoglTexture2DSliced *tex_2ds = COGL_TEXTURE_2D_SLICED (tex);
return tex_2ds->max_waste;
}
static gboolean
_cogl_texture_2d_sliced_is_sliced (CoglTexture *tex)
{
CoglTexture2DSliced *tex_2ds = COGL_TEXTURE_2D_SLICED (tex);
if (tex_2ds->slice_gl_handles == NULL)
return FALSE;
if (tex_2ds->slice_gl_handles->len <= 1)
return FALSE;
return TRUE;
}
static gboolean
_cogl_texture_2d_sliced_can_hardware_repeat (CoglTexture *tex)
{
CoglTexture2DSliced *tex_2ds = COGL_TEXTURE_2D_SLICED (tex);
CoglSpan *x_span;
CoglSpan *y_span;
x_span = &g_array_index (tex_2ds->slice_x_spans, CoglSpan, 0);
y_span = &g_array_index (tex_2ds->slice_y_spans, CoglSpan, 0);
#if HAVE_COGL_GL
/* TODO: COGL_TEXTURE_TYPE_2D_RECTANGLE */
if (tex_2ds->gl_target == GL_TEXTURE_RECTANGLE_ARB)
return FALSE;
#endif
return (x_span->waste || y_span->waste) ? FALSE : TRUE;
}
static void
_cogl_texture_2d_sliced_transform_coords_to_gl (CoglTexture *tex,
float *s,
float *t)
{
CoglTexture2DSliced *tex_2ds = COGL_TEXTURE_2D_SLICED (tex);
CoglSpan *x_span;
CoglSpan *y_span;
g_assert (!_cogl_texture_2d_sliced_is_sliced (tex));
/* Don't include the waste in the texture coordinates */
x_span = &g_array_index (tex_2ds->slice_x_spans, CoglSpan, 0);
y_span = &g_array_index (tex_2ds->slice_y_spans, CoglSpan, 0);
*s *= tex_2ds->width / (float)x_span->size;
*t *= tex_2ds->height / (float)y_span->size;
#if HAVE_COGL_GL
/* Denormalize texture coordinates for rectangle textures */
if (tex_2ds->gl_target == GL_TEXTURE_RECTANGLE_ARB)
{
*s *= x_span->size;
*t *= y_span->size;
}
#endif
}
static CoglTransformResult
_cogl_texture_2d_sliced_transform_quad_coords_to_gl (CoglTexture *tex,
float *coords)
{
gboolean need_repeat = FALSE;
int i;
/* This is a bit lazy - in the case where the quad lies entirely
* within a single slice we could avoid the fallback. But that
* could likely lead to visual inconsistency if the fallback involves
* dropping layers, so this might be the right thing to do anyways.
*/
if (_cogl_texture_2d_sliced_is_sliced (tex))
return COGL_TRANSFORM_SOFTWARE_REPEAT;
for (i = 0; i < 4; i++)
if (coords[i] < 0.0f || coords[i] > 1.0f)
need_repeat = TRUE;
if (need_repeat && !_cogl_texture_2d_sliced_can_hardware_repeat (tex))
return COGL_TRANSFORM_SOFTWARE_REPEAT;
_cogl_texture_2d_sliced_transform_coords_to_gl (tex, coords + 0, coords + 1);
_cogl_texture_2d_sliced_transform_coords_to_gl (tex, coords + 2, coords + 3);
return (need_repeat
? COGL_TRANSFORM_HARDWARE_REPEAT : COGL_TRANSFORM_NO_REPEAT);
}
static gboolean
_cogl_texture_2d_sliced_get_gl_texture (CoglTexture *tex,
GLuint *out_gl_handle,
GLenum *out_gl_target)
{
CoglTexture2DSliced *tex_2ds = COGL_TEXTURE_2D_SLICED (tex);
if (tex_2ds->slice_gl_handles == NULL)
return FALSE;
if (tex_2ds->slice_gl_handles->len < 1)
return FALSE;
if (out_gl_handle != NULL)
*out_gl_handle = g_array_index (tex_2ds->slice_gl_handles, GLuint, 0);
if (out_gl_target != NULL)
*out_gl_target = tex_2ds->gl_target;
return TRUE;
}
static void
_cogl_texture_2d_sliced_set_filters (CoglTexture *tex,
GLenum min_filter,
GLenum mag_filter)
{
CoglTexture2DSliced *tex_2ds = COGL_TEXTURE_2D_SLICED (tex);
GLuint gl_handle;
int i;
/* Make sure slices were created */
if (tex_2ds->slice_gl_handles == NULL)
return;
if (min_filter == tex_2ds->min_filter
&& mag_filter == tex_2ds->mag_filter)
return;
/* Store new values */
tex_2ds->min_filter = min_filter;
tex_2ds->mag_filter = mag_filter;
/* Apply new filters to every slice */
for (i=0; i<tex_2ds->slice_gl_handles->len; ++i)
{
gl_handle = g_array_index (tex_2ds->slice_gl_handles, GLuint, i);
GE( glBindTexture (tex_2ds->gl_target, gl_handle) );
GE( glTexParameteri (tex_2ds->gl_target, GL_TEXTURE_MAG_FILTER,
tex_2ds->mag_filter) );
GE( glTexParameteri (tex_2ds->gl_target, GL_TEXTURE_MIN_FILTER,
tex_2ds->min_filter) );
}
}
static void
_cogl_texture_2d_sliced_ensure_mipmaps (CoglTexture *tex)
{
CoglTexture2DSliced *tex_2ds = COGL_TEXTURE_2D_SLICED (tex);
int i;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
/* Only update if the mipmaps are dirty */
if (!tex_2ds->auto_mipmap || !tex_2ds->mipmaps_dirty)
return;
/* Make sure slices were created */
if (tex_2ds->slice_gl_handles == NULL)
return;
/* Regenerate the mipmaps on every slice */
for (i = 0; i < tex_2ds->slice_gl_handles->len; i++)
{
GLuint gl_handle = g_array_index (tex_2ds->slice_gl_handles, GLuint, i);
GE( glBindTexture (tex_2ds->gl_target, gl_handle) );
/* glGenerateMipmap is defined in the FBO extension */
if (cogl_features_available (COGL_FEATURE_OFFSCREEN))
_cogl_texture_driver_gl_generate_mipmaps (tex_2ds->gl_target);
else if (tex_2ds->first_pixels)
{
CoglTexturePixel *pixel = tex_2ds->first_pixels + i;
/* Temporarily enable automatic mipmap generation and
re-upload the first pixel to cause a regeneration */
GE( glTexParameteri (tex_2ds->gl_target, GL_GENERATE_MIPMAP, GL_TRUE) );
GE( glTexSubImage2D (tex_2ds->gl_target, 0, 0, 0, 1, 1,
pixel->gl_format, pixel->gl_type,
pixel->data) );
GE( glTexParameteri (tex_2ds->gl_target, GL_GENERATE_MIPMAP, GL_FALSE) );
}
}
tex_2ds->mipmaps_dirty = FALSE;
}
static void
_cogl_texture_2d_sliced_ensure_non_quad_rendering (CoglTexture *tex)
{
/* Nothing needs to be done */
}
static gboolean
_cogl_texture_2d_sliced_set_region (CoglTexture *tex,
int src_x,
int src_y,
int dst_x,
int dst_y,
unsigned int dst_width,
unsigned int dst_height,
int width,
int height,
CoglPixelFormat format,
unsigned int rowstride,
const guint8 *data)
{
CoglTexture2DSliced *tex_2ds = COGL_TEXTURE_2D_SLICED (tex);
int bpp;
CoglBitmap source_bmp;
CoglBitmap tmp_bmp;
gboolean tmp_bmp_owner = FALSE;
GLenum closest_gl_format;
GLenum closest_gl_type;
/* Check for valid format */
if (format == COGL_PIXEL_FORMAT_ANY)
return FALSE;
/* Shortcut out early if the image is empty */
if (width == 0 || height == 0)
return TRUE;
/* Init source bitmap */
source_bmp.width = width;
source_bmp.height = height;
source_bmp.format = format;
source_bmp.data = (guint8 *)data;
/* Rowstride from width if none specified */
bpp = _cogl_get_format_bpp (format);
source_bmp.rowstride = (rowstride == 0) ? width * bpp : rowstride;
/* Prepare the bitmap so that it will do the premultiplication
conversion */
_cogl_texture_prepare_for_upload (&source_bmp,
tex_2ds->format,
NULL,
&tmp_bmp,
&tmp_bmp_owner,
NULL,
&closest_gl_format,
&closest_gl_type);
/* Send data to GL */
_cogl_texture_2d_sliced_upload_subregion_to_gl (tex_2ds,
src_x, src_y,
dst_x, dst_y,
dst_width, dst_height,
&tmp_bmp,
closest_gl_format,
closest_gl_type);
/* Free data if owner */
if (tmp_bmp_owner)
g_free (tmp_bmp.data);
return TRUE;
}
static gboolean
_cogl_texture_2d_sliced_download_from_gl (
CoglTexture2DSliced *tex_2ds,
CoglBitmap *target_bmp,
GLuint target_gl_format,
GLuint target_gl_type)
{
CoglSpan *x_span;
CoglSpan *y_span;
GLuint gl_handle;
int bpp;
int x, y;
CoglBitmap slice_bmp;
bpp = _cogl_get_format_bpp (target_bmp->format);
/* Iterate vertical slices */
for (y = 0; y < tex_2ds->slice_y_spans->len; ++y)
{
y_span = &g_array_index (tex_2ds->slice_y_spans, CoglSpan, y);
/* Iterate horizontal slices */
for (x = 0; x < tex_2ds->slice_x_spans->len; ++x)
{
/*if (x != 0 || y != 1) continue;*/
x_span = &g_array_index (tex_2ds->slice_x_spans, CoglSpan, x);
/* Pick the gl texture object handle */
gl_handle = g_array_index (tex_2ds->slice_gl_handles, GLuint,
y * tex_2ds->slice_x_spans->len + x);
/* If there's any waste we need to copy manually
(no glGetTexSubImage) */
if (y_span->waste != 0 || x_span->waste != 0)
{
/* Setup temp bitmap for slice subregion */
slice_bmp.format = target_bmp->format;
slice_bmp.width = x_span->size;
slice_bmp.height = y_span->size;
slice_bmp.rowstride = bpp * slice_bmp.width;
slice_bmp.data = g_malloc (slice_bmp.rowstride *
slice_bmp.height);
/* Setup gl alignment to 0,0 top-left corner */
_cogl_texture_driver_prep_gl_for_pixels_download (
slice_bmp.rowstride,
bpp);
/* Download slice image data into temp bmp */
GE( glBindTexture (tex_2ds->gl_target, gl_handle) );
if (!_cogl_texture_driver_gl_get_tex_image (tex_2ds->gl_target,
target_gl_format,
target_gl_type,
slice_bmp.data))
{
/* Free temp bitmap */
g_free (slice_bmp.data);
return FALSE;
}
/* Copy portion of slice from temp to target bmp */
_cogl_bitmap_copy_subregion (&slice_bmp,
target_bmp,
0, 0,
x_span->start,
y_span->start,
x_span->size - x_span->waste,
y_span->size - y_span->waste);
/* Free temp bitmap */
g_free (slice_bmp.data);
}
else
{
GLvoid *dst = target_bmp->data
+ x_span->start * bpp
+ y_span->start * target_bmp->rowstride;
_cogl_texture_driver_prep_gl_for_pixels_download (
target_bmp->rowstride,
bpp);
/* Download slice image data */
GE( glBindTexture (tex_2ds->gl_target, gl_handle) );
if (!_cogl_texture_driver_gl_get_tex_image (tex_2ds->gl_target,
target_gl_format,
target_gl_type,
dst))
{
return FALSE;
}
}
}
}
return TRUE;
}
static int
_cogl_texture_2d_sliced_get_data (CoglTexture *tex,
CoglPixelFormat format,
unsigned int rowstride,
guint8 *data)
{
CoglTexture2DSliced *tex_2ds = COGL_TEXTURE_2D_SLICED (tex);
int bpp;
int byte_size;
CoglPixelFormat closest_format;
int closest_bpp;
GLenum closest_gl_format;
GLenum closest_gl_type;
CoglBitmap target_bmp;
CoglBitmap new_bmp;
gboolean success;
guint8 *src;
guint8 *dst;
int y;
/* Default to internal format if none specified */
if (format == COGL_PIXEL_FORMAT_ANY)
format = tex_2ds->format;
/* Rowstride from texture width if none specified */
bpp = _cogl_get_format_bpp (format);
if (rowstride == 0)
rowstride = tex_2ds->width * bpp;
/* Return byte size if only that requested */
byte_size = tex_2ds->height * rowstride;
if (data == NULL)
return byte_size;
closest_format =
_cogl_texture_driver_find_best_gl_get_data_format (format,
&closest_gl_format,
&closest_gl_type);
closest_bpp = _cogl_get_format_bpp (closest_format);
target_bmp.width = tex_2ds->width;
target_bmp.height = tex_2ds->height;
/* Is the requested format supported? */
if (closest_format == format)
{
/* Target user data directly */
target_bmp.format = format;
target_bmp.rowstride = rowstride;
target_bmp.data = data;
}
else
{
/* Target intermediate buffer */
target_bmp.format = closest_format;
target_bmp.rowstride = target_bmp.width * closest_bpp;
target_bmp.data = g_malloc (target_bmp.height * target_bmp.rowstride);
}
/* Retrieve data from slices */
if (!_cogl_texture_2d_sliced_download_from_gl (tex_2ds, &target_bmp,
closest_gl_format,
closest_gl_type))
{
/* XXX: In some cases _cogl_texture_2d_sliced_download_from_gl may
* fail to read back the texture data; such as for GLES which doesn't
* support glGetTexImage, so here we fallback to drawing the texture
* and reading the pixels from the framebuffer. */
_cogl_texture_draw_and_read (tex, &target_bmp,
closest_gl_format,
closest_gl_type);
}
/* Was intermediate used? */
if (closest_format != format)
{
/* Convert to requested format */
success = _cogl_bitmap_convert_format_and_premult (&target_bmp,
&new_bmp,
format);
/* Free intermediate data and return if failed */
g_free (target_bmp.data);
if (!success) return 0;
/* Copy to user buffer */
for (y = 0; y < new_bmp.height; ++y)
{
src = new_bmp.data + y * new_bmp.rowstride;
dst = data + y * rowstride;
memcpy (dst, src, new_bmp.width);
}
/* Free converted data */
g_free (new_bmp.data);
}
return byte_size;
}
static CoglPixelFormat
_cogl_texture_2d_sliced_get_format (CoglTexture *tex)
{
return COGL_TEXTURE_2D_SLICED (tex)->format;
}
static GLenum
_cogl_texture_2d_sliced_get_gl_format (CoglTexture *tex)
{
return COGL_TEXTURE_2D_SLICED (tex)->gl_format;
}
static int
_cogl_texture_2d_sliced_get_width (CoglTexture *tex)
{
return COGL_TEXTURE_2D_SLICED (tex)->width;
}
static int
_cogl_texture_2d_sliced_get_height (CoglTexture *tex)
{
return COGL_TEXTURE_2D_SLICED (tex)->height;
}
static const CoglTextureVtable
cogl_texture_2d_sliced_vtable =
{
_cogl_texture_2d_sliced_set_region,
_cogl_texture_2d_sliced_get_data,
_cogl_texture_2d_sliced_foreach_sub_texture_in_region,
_cogl_texture_2d_sliced_get_max_waste,
_cogl_texture_2d_sliced_is_sliced,
_cogl_texture_2d_sliced_can_hardware_repeat,
_cogl_texture_2d_sliced_transform_coords_to_gl,
_cogl_texture_2d_sliced_transform_quad_coords_to_gl,
_cogl_texture_2d_sliced_get_gl_texture,
_cogl_texture_2d_sliced_set_filters,
_cogl_texture_2d_sliced_ensure_mipmaps,
_cogl_texture_2d_sliced_ensure_non_quad_rendering,
_cogl_texture_2d_sliced_set_wrap_mode_parameters,
_cogl_texture_2d_sliced_get_format,
_cogl_texture_2d_sliced_get_gl_format,
_cogl_texture_2d_sliced_get_width,
_cogl_texture_2d_sliced_get_height
};
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