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mutter/cogl/cogl-texture-2d-sliced.c
Sunil Sadasivan 4abd42aced cogl_texture_get_data() copies using wrong width size. 
For sliced 2D textures, _cogl_texture_2d_sliced_get_data() uses the
bitmap width, instead of the rowstride, when memcpy()ing into the
dest buffer.

Signed-off-by: Robert Bragg <robert@linux.intel.com>
2010-06-10 20:58:22 +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 "cogl-material-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,
tex_2ds->is_foreign,
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,
tex_2ds->is_foreign,
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);
_cogl_bind_gl_texture_transient (tex_2ds->gl_target,
texnum,
tex_2ds->is_foreign);
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 */
_cogl_bind_gl_texture_transient (tex_2ds->gl_target,
gl_handles[y * n_x_slices + x],
FALSE);
_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, NULL) );
}
}
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)
{
int i;
if (tex_2ds->is_foreign == FALSE)
for (i = 0; i < tex_2ds->slice_gl_handles->len; i++)
{
GLuint texture =
g_array_index (tex_2ds->slice_gl_handles, GLuint, i);
_cogl_delete_gl_texture (texture);
}
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);
/* Chain up */
_cogl_texture_free (COGL_TEXTURE (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,
dst_bmp.width,
dst_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,
&dst_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)
;
_cogl_bind_gl_texture_transient (gl_target, gl_handle, TRUE);
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 gboolean
_cogl_texture_2d_sliced_is_foreign (CoglTexture *tex)
{
return COGL_TEXTURE_2D_SLICED (tex)->is_foreign;
}
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);
_cogl_bind_gl_texture_transient (tex_2ds->gl_target,
gl_handle,
tex_2ds->is_foreign);
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);
_cogl_bind_gl_texture_transient (tex_2ds->gl_target,
gl_handle,
tex_2ds->is_foreign);
/* 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 */
_cogl_bind_gl_texture_transient (tex_2ds->gl_target,
gl_handle,
tex_2ds->is_foreign);
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 */
_cogl_bind_gl_texture_transient (tex_2ds->gl_target,
gl_handle,
tex_2ds->is_foreign);
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.rowstride);
}
/* 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,
_cogl_texture_2d_sliced_is_foreign
};
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