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mutter/cogl/cogl-texture.c
Robert Bragg 426c8b8f41 features: Support more than 32 features! 
Currently features are represented as bits in a 32bit mask so we
obviously can't have more than 32 features with that approach. The new
approach is to use the COGL_FLAGS_ macros which lets us handle bitmasks
without a size limit and we change the public api to accept individual
feature enums instead of a mask. This way there is no limit on the
number of features we can add to Cogl.

Instead of using cogl_features_available() there is a new
cogl_has_feature() function and for checking multiple features there is
cogl_has_features() which takes a zero terminated vararg list of
features.

In addition to being able to check for individual features this also
adds a way to query all the features currently available via
cogl_foreach_feature() which will call a callback for each feature.

Since the new functions take an explicit context pointer there is also
no longer any ambiguity over when users can first start to query
features.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
2011-11-01 12:03:01 +00:00

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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2007,2008,2009 Intel Corporation.
* Copyright (C) 2010 Red Hat, Inc.
*
* 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-buffer-private.h"
#include "cogl-pixel-buffer-private.h"
#include "cogl-private.h"
#include "cogl-texture-private.h"
#include "cogl-texture-driver.h"
#include "cogl-texture-2d-sliced-private.h"
#include "cogl-texture-2d-private.h"
#include "cogl-texture-rectangle-private.h"
#include "cogl-sub-texture-private.h"
#include "cogl-atlas-texture-private.h"
#include "cogl-pipeline.h"
#include "cogl-context-private.h"
#include "cogl-handle.h"
#include "cogl-object-private.h"
#include "cogl-primitives.h"
#include "cogl-framebuffer-private.h"
#include <string.h>
#include <stdlib.h>
#include <math.h>
GQuark
cogl_texture_error_quark (void)
{
return g_quark_from_static_string ("cogl-texture-error-quark");
}
/* XXX:
* The CoglHandle macros don't support any form of inheritance, so for
* now we implement the CoglHandle support for the CoglTexture
* abstract class manually.
*/
void
_cogl_texture_register_texture_type (GQuark type)
{
_COGL_GET_CONTEXT (ctxt, NO_RETVAL);
ctxt->texture_types = g_slist_prepend (ctxt->texture_types,
GINT_TO_POINTER (type));
}
gboolean
cogl_is_texture (void *object)
{
CoglObject *obj = (CoglObject *)object;
GSList *l;
_COGL_GET_CONTEXT (ctxt, FALSE);
if (object == NULL)
return FALSE;
for (l = ctxt->texture_types; l; l = l->next)
if (GPOINTER_TO_INT (l->data) == obj->klass->type)
return TRUE;
return FALSE;
}
void *
cogl_texture_ref (void *object)
{
if (!cogl_is_texture (object))
return NULL;
_COGL_OBJECT_DEBUG_REF (CoglTexture, object);
cogl_object_ref (object);
return object;
}
void
cogl_texture_unref (void *object)
{
if (!cogl_is_texture (object))
{
g_warning (G_STRINGIFY (cogl_texture_unref)
": Ignoring unref of CoglObject "
"due to type mismatch");
return;
}
_COGL_OBJECT_DEBUG_UNREF (CoglTexture, object);
cogl_object_unref (object);
}
void
_cogl_texture_init (CoglTexture *texture,
const CoglTextureVtable *vtable)
{
texture->vtable = vtable;
texture->framebuffers = NULL;
}
void
_cogl_texture_free (CoglTexture *texture)
{
g_free (texture);
}
static gboolean
_cogl_texture_needs_premult_conversion (CoglPixelFormat src_format,
CoglPixelFormat dst_format)
{
return ((src_format & dst_format & COGL_A_BIT) &&
src_format != COGL_PIXEL_FORMAT_A_8 &&
dst_format != COGL_PIXEL_FORMAT_A_8 &&
(src_format & COGL_PREMULT_BIT) !=
(dst_format & COGL_PREMULT_BIT));
}
CoglPixelFormat
_cogl_texture_determine_internal_format (CoglPixelFormat src_format,
CoglPixelFormat dst_format)
{
/* If the application hasn't specified a specific format then we'll
* pick the most appropriate. By default Cogl will use a
* premultiplied internal format. Later we will add control over
* this. */
if (dst_format == COGL_PIXEL_FORMAT_ANY)
{
if ((src_format & COGL_A_BIT) &&
src_format != COGL_PIXEL_FORMAT_A_8)
return src_format | COGL_PREMULT_BIT;
else
return src_format;
}
else
return dst_format;
}
CoglBitmap *
_cogl_texture_prepare_for_upload (CoglBitmap *src_bmp,
CoglPixelFormat dst_format,
CoglPixelFormat *dst_format_out,
GLenum *out_glintformat,
GLenum *out_glformat,
GLenum *out_gltype)
{
CoglPixelFormat src_format = _cogl_bitmap_get_format (src_bmp);
CoglBitmap *dst_bmp;
_COGL_GET_CONTEXT (ctx, NULL);
dst_format = _cogl_texture_determine_internal_format (src_format,
dst_format);
/* OpenGL supports specifying a different format for the internal
format when uploading texture data. We should use this to convert
formats because it is likely to be faster and support more types
than the Cogl bitmap code. However under GLES the internal format
must be the same as the bitmap format and it only supports a
limited number of formats so we must convert using the Cogl
bitmap code instead */
if (ctx->driver == COGL_DRIVER_GL)
{
/* If the source format does not have the same premult flag as the
dst format then we need to copy and convert it */
if (_cogl_texture_needs_premult_conversion (src_format,
dst_format))
{
dst_bmp = _cogl_bitmap_copy (src_bmp);
if (!_cogl_bitmap_convert_premult_status (dst_bmp,
src_format ^
COGL_PREMULT_BIT))
{
cogl_object_unref (dst_bmp);
return NULL;
}
}
else
dst_bmp = cogl_object_ref (src_bmp);
/* Use the source format from the src bitmap type and the internal
format from the dst format type so that GL can do the
conversion */
ctx->texture_driver->pixel_format_to_gl (src_format,
NULL, /* internal format */
out_glformat,
out_gltype);
ctx->texture_driver->pixel_format_to_gl (dst_format,
out_glintformat,
NULL,
NULL);
}
else
{
CoglPixelFormat closest_format;
closest_format = ctx->texture_driver->pixel_format_to_gl (dst_format,
out_glintformat,
out_glformat,
out_gltype);
if (closest_format != src_format)
dst_bmp = _cogl_bitmap_convert_format_and_premult (src_bmp,
closest_format);
else
dst_bmp = cogl_object_ref (src_bmp);
}
if (dst_format_out)
*dst_format_out = dst_format;
return dst_bmp;
}
void
_cogl_texture_prep_gl_alignment_for_pixels_upload (int pixels_rowstride)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (!(pixels_rowstride & 0x7))
GE( ctx, glPixelStorei (GL_UNPACK_ALIGNMENT, 8) );
else if (!(pixels_rowstride & 0x3))
GE( ctx, glPixelStorei (GL_UNPACK_ALIGNMENT, 4) );
else if (!(pixels_rowstride & 0x1))
GE( ctx, glPixelStorei (GL_UNPACK_ALIGNMENT, 2) );
else
GE( ctx, glPixelStorei (GL_UNPACK_ALIGNMENT, 1) );
}
void
_cogl_texture_prep_gl_alignment_for_pixels_download (int pixels_rowstride)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (!(pixels_rowstride & 0x7))
GE( ctx, glPixelStorei (GL_PACK_ALIGNMENT, 8) );
else if (!(pixels_rowstride & 0x3))
GE( ctx, glPixelStorei (GL_PACK_ALIGNMENT, 4) );
else if (!(pixels_rowstride & 0x1))
GE( ctx, glPixelStorei (GL_PACK_ALIGNMENT, 2) );
else
GE( ctx, glPixelStorei (GL_PACK_ALIGNMENT, 1) );
}
/* FIXME: wrap modes should be set on pipelines not textures */
void
_cogl_texture_set_wrap_mode_parameters (CoglTexture *texture,
GLenum wrap_mode_s,
GLenum wrap_mode_t,
GLenum wrap_mode_p)
{
texture->vtable->set_wrap_mode_parameters (texture,
wrap_mode_s,
wrap_mode_t,
wrap_mode_p);
}
/* This is like CoglSpanIter except it deals with floats and it
effectively assumes there is only one span from 0.0 to 1.0 */
typedef struct _CoglTextureIter
{
float pos, end, next_pos;
gboolean flipped;
float t_1, t_2;
} CoglTextureIter;
static void
_cogl_texture_iter_update (CoglTextureIter *iter)
{
float t_2;
float frac_part;
frac_part = modff (iter->pos, &iter->next_pos);
/* modff rounds the int part towards zero so we need to add one if
we're meant to be heading away from zero */
if (iter->pos >= 0.0f || frac_part == 0.0f)
iter->next_pos += 1.0f;
if (iter->next_pos > iter->end)
t_2 = iter->end;
else
t_2 = iter->next_pos;
if (iter->flipped)
{
iter->t_1 = t_2;
iter->t_2 = iter->pos;
}
else
{
iter->t_1 = iter->pos;
iter->t_2 = t_2;
}
}
static void
_cogl_texture_iter_begin (CoglTextureIter *iter,
float t_1, float t_2)
{
if (t_1 <= t_2)
{
iter->pos = t_1;
iter->end = t_2;
iter->flipped = FALSE;
}
else
{
iter->pos = t_2;
iter->end = t_1;
iter->flipped = TRUE;
}
_cogl_texture_iter_update (iter);
}
static void
_cogl_texture_iter_next (CoglTextureIter *iter)
{
iter->pos = iter->next_pos;
_cogl_texture_iter_update (iter);
}
static gboolean
_cogl_texture_iter_end (CoglTextureIter *iter)
{
return iter->pos >= iter->end;
}
/* This invokes the callback with enough quads to cover the manually
repeated range specified by the virtual texture coordinates without
emitting coordinates outside the range [0,1] */
void
_cogl_texture_iterate_manual_repeats (CoglTextureManualRepeatCallback callback,
float tx_1, float ty_1,
float tx_2, float ty_2,
void *user_data)
{
CoglTextureIter x_iter, y_iter;
for (_cogl_texture_iter_begin (&y_iter, ty_1, ty_2);
!_cogl_texture_iter_end (&y_iter);
_cogl_texture_iter_next (&y_iter))
for (_cogl_texture_iter_begin (&x_iter, tx_1, tx_2);
!_cogl_texture_iter_end (&x_iter);
_cogl_texture_iter_next (&x_iter))
{
float coords[4] = { x_iter.t_1, y_iter.t_1, x_iter.t_2, y_iter.t_2 };
callback (coords, user_data);
}
}
CoglTexture *
cogl_texture_new_with_size (unsigned int width,
unsigned int height,
CoglTextureFlags flags,
CoglPixelFormat internal_format)
{
CoglTexture *tex;
_COGL_GET_CONTEXT (ctx, COGL_INVALID_HANDLE);
/* First try creating a fast-path non-sliced texture */
tex = COGL_TEXTURE (cogl_texture_2d_new_with_size (ctx,
width, height,
internal_format,
NULL));
/* If it fails resort to sliced textures */
if (tex == NULL)
{
int max_waste = flags & COGL_TEXTURE_NO_SLICING ? -1 : COGL_TEXTURE_MAX_WASTE;
tex = COGL_TEXTURE (cogl_texture_2d_sliced_new_with_size (ctx,
width,
height,
max_waste,
internal_format,
NULL));
}
return tex;
}
CoglTexture *
cogl_texture_new_from_data (unsigned int width,
unsigned int height,
CoglTextureFlags flags,
CoglPixelFormat format,
CoglPixelFormat internal_format,
unsigned int rowstride,
const guint8 *data)
{
CoglBitmap *bmp;
CoglTexture *tex;
if (format == COGL_PIXEL_FORMAT_ANY)
return NULL;
if (data == NULL)
return NULL;
/* Rowstride from width if not given */
if (rowstride == 0)
rowstride = width * _cogl_get_format_bpp (format);
/* Wrap the data into a bitmap */
bmp = _cogl_bitmap_new_from_data ((guint8 *) data,
format,
width,
height,
rowstride,
NULL, NULL);
tex = cogl_texture_new_from_bitmap (bmp, flags, internal_format);
cogl_object_unref (bmp);
return tex;
}
CoglTexture *
cogl_texture_new_from_bitmap (CoglBitmap *bitmap,
CoglTextureFlags flags,
CoglPixelFormat internal_format)
{
CoglTexture *tex;
/* First try putting the texture in the atlas */
if ((tex = _cogl_atlas_texture_new_from_bitmap (bitmap,
flags,
internal_format)))
return tex;
/* If that doesn't work try a fast path 2D texture */
if ((tex = _cogl_texture_2d_new_from_bitmap (bitmap,
flags,
internal_format,
NULL)))
return tex;
/* Otherwise create a sliced texture */
return
COGL_TEXTURE (_cogl_texture_2d_sliced_new_from_bitmap (bitmap,
flags,
internal_format));
}
CoglTexture *
cogl_texture_new_from_file (const char *filename,
CoglTextureFlags flags,
CoglPixelFormat internal_format,
GError **error)
{
CoglBitmap *bmp;
CoglTexture *texture = NULL;
CoglPixelFormat src_format;
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
bmp = cogl_bitmap_new_from_file (filename, error);
if (bmp == NULL)
return NULL;
src_format = _cogl_bitmap_get_format (bmp);
/* We know that the bitmap data is solely owned by this function so
we can do the premult conversion in place. This avoids having to
copy the bitmap which will otherwise happen in
_cogl_texture_prepare_for_upload */
internal_format =
_cogl_texture_determine_internal_format (src_format, internal_format);
if (!_cogl_texture_needs_premult_conversion (src_format, internal_format) ||
_cogl_bitmap_convert_premult_status (bmp, src_format ^ COGL_PREMULT_BIT))
texture = cogl_texture_new_from_bitmap (bmp, flags, internal_format);
cogl_object_unref (bmp);
return texture;
}
CoglTexture *
cogl_texture_new_from_foreign (GLuint gl_handle,
GLenum gl_target,
GLuint width,
GLuint height,
GLuint x_pot_waste,
GLuint y_pot_waste,
CoglPixelFormat format)
{
#if HAVE_COGL_GL
if (gl_target == GL_TEXTURE_RECTANGLE_ARB)
{
if (x_pot_waste != 0 || y_pot_waste != 0)
{
/* It shouldn't be necessary to have waste in this case since
* the texture isn't limited to power of two sizes. */
g_warning ("You can't create a foreign GL_TEXTURE_RECTANGLE cogl "
"texture with waste\n");
return COGL_INVALID_HANDLE;
}
return _cogl_texture_rectangle_new_from_foreign (gl_handle,
width,
height,
format);
}
#endif
if (x_pot_waste != 0 || y_pot_waste != 0)
return COGL_TEXTURE (_cogl_texture_2d_sliced_new_from_foreign (gl_handle,
gl_target,
width,
height,
x_pot_waste,
y_pot_waste,
format));
else
{
_COGL_GET_CONTEXT (ctx, COGL_INVALID_HANDLE);
return COGL_TEXTURE (cogl_texture_2d_new_from_foreign (ctx,
gl_handle,
width,
height,
format,
NULL));
}
}
gboolean
_cogl_texture_is_foreign (CoglTexture *texture)
{
if (texture->vtable->is_foreign)
return texture->vtable->is_foreign (texture);
else
return FALSE;
}
CoglTexture *
cogl_texture_new_from_sub_texture (CoglTexture *full_texture,
int sub_x,
int sub_y,
int sub_width,
int sub_height)
{
return _cogl_sub_texture_new (full_texture, sub_x, sub_y,
sub_width, sub_height);
}
CoglTexture *
cogl_texture_new_from_buffer_EXP (CoglPixelBuffer *buffer,
unsigned int width,
unsigned int height,
CoglTextureFlags flags,
CoglPixelFormat format,
CoglPixelFormat internal_format,
unsigned int rowstride,
const unsigned int offset)
{
CoglTexture *texture;
CoglBuffer *cogl_buffer;
CoglPixelBuffer *pixel_buffer;
CoglBitmap *bmp;
g_return_val_if_fail (cogl_is_buffer (buffer), NULL);
if (format == COGL_PIXEL_FORMAT_ANY)
return NULL;
cogl_buffer = COGL_BUFFER (buffer);
pixel_buffer = COGL_PIXEL_BUFFER (buffer);
/* Rowstride from CoglBuffer or even width * bpp if not given */
if (rowstride == 0)
rowstride = pixel_buffer->stride;
if (rowstride == 0)
rowstride = width * _cogl_get_format_bpp (format);
/* use the CoglBuffer height and width as last resort */
if (width == 0)
width = pixel_buffer->width;
if (height == 0)
height = pixel_buffer->height;
if (width == 0 || height == 0)
{
/* no width or height specified, neither at creation time (because the
* array was created by cogl_pixel_buffer_new()) nor when calling this
* function */
return NULL;
}
/* Wrap the buffer into a bitmap */
bmp = cogl_bitmap_new_from_buffer (cogl_buffer,
format,
width, height,
rowstride,
offset);
texture = cogl_texture_new_from_bitmap (bmp, flags, internal_format);
cogl_object_unref (bmp);
return texture;
}
unsigned int
cogl_texture_get_width (CoglTexture *texture)
{
return texture->vtable->get_width (texture);
}
unsigned int
cogl_texture_get_height (CoglTexture *texture)
{
return texture->vtable->get_height (texture);
}
CoglPixelFormat
cogl_texture_get_format (CoglTexture *texture)
{
return texture->vtable->get_format (texture);
}
unsigned int
cogl_texture_get_rowstride (CoglTexture *texture)
{
/* FIXME: This function should go away. It previously just returned
the rowstride that was used to upload the data as far as I can
tell. This is not helpful */
/* Just guess at a suitable rowstride */
return (_cogl_get_format_bpp (cogl_texture_get_format (texture))
* cogl_texture_get_width (texture));
}
int
cogl_texture_get_max_waste (CoglTexture *texture)
{
return texture->vtable->get_max_waste (texture);
}
gboolean
cogl_texture_is_sliced (CoglTexture *texture)
{
return texture->vtable->is_sliced (texture);
}
/* Some CoglTextures, notably sliced textures or atlas textures when repeating
* is used, will need to divide the coordinate space into multiple GL textures
* (or rather; in the case of atlases duplicate a single texture in multiple
* positions to handle repeating)
*
* This function helps you implement primitives using such textures by
* invoking a callback once for each sub texture that intersects a given
* region specified in texture coordinates.
*/
void
_cogl_texture_foreach_sub_texture_in_region (CoglTexture *texture,
float virtual_tx_1,
float virtual_ty_1,
float virtual_tx_2,
float virtual_ty_2,
CoglTextureSliceCallback callback,
void *user_data)
{
texture->vtable->foreach_sub_texture_in_region (texture,
virtual_tx_1,
virtual_ty_1,
virtual_tx_2,
virtual_ty_2,
callback,
user_data);
}
/* If this returns FALSE, that implies _foreach_sub_texture_in_region
* will be needed to iterate over multiple sub textures for regions whos
* texture coordinates extend out of the range [0,1]
*/
gboolean
_cogl_texture_can_hardware_repeat (CoglTexture *texture)
{
return texture->vtable->can_hardware_repeat (texture);
}
/* NB: You can't use this with textures comprised of multiple sub textures (use
* cogl_texture_is_sliced() to check) since coordinate transformation for such
* textures will be different for each slice. */
void
_cogl_texture_transform_coords_to_gl (CoglTexture *texture,
float *s,
float *t)
{
texture->vtable->transform_coords_to_gl (texture, s, t);
}
CoglTransformResult
_cogl_texture_transform_quad_coords_to_gl (CoglTexture *texture,
float *coords)
{
return texture->vtable->transform_quad_coords_to_gl (texture, coords);
}
GLenum
_cogl_texture_get_gl_format (CoglTexture *texture)
{
return texture->vtable->get_gl_format (texture);
}
gboolean
cogl_texture_get_gl_texture (CoglTexture *texture,
GLuint *out_gl_handle,
GLenum *out_gl_target)
{
return texture->vtable->get_gl_texture (texture,
out_gl_handle, out_gl_target);
}
void
_cogl_texture_set_filters (CoglTexture *texture,
GLenum min_filter,
GLenum mag_filter)
{
texture->vtable->set_filters (texture, min_filter, mag_filter);
}
void
_cogl_texture_pre_paint (CoglTexture *texture, CoglTexturePrePaintFlags flags)
{
texture->vtable->pre_paint (texture, flags);
}
void
_cogl_texture_ensure_non_quad_rendering (CoglTexture *texture)
{
texture->vtable->ensure_non_quad_rendering (texture);
}
gboolean
cogl_texture_set_region_from_bitmap (CoglTexture *texture,
int src_x,
int src_y,
int dst_x,
int dst_y,
unsigned int dst_width,
unsigned int dst_height,
CoglBitmap *bmp)
{
gboolean ret;
/* Shortcut out early if the image is empty */
if (dst_width == 0 || dst_height == 0)
return TRUE;
/* Note that we don't prepare the bitmap for upload here because
some backends may be internally using a different format for the
actual GL texture than that reported by
cogl_texture_get_format. For example the atlas textures are
always stored in an RGBA texture even if the texture format is
advertised as RGB. */
ret = texture->vtable->set_region (texture,
src_x, src_y,
dst_x, dst_y,
dst_width, dst_height,
bmp);
return ret;
}
gboolean
cogl_texture_set_region (CoglTexture *texture,
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)
{
CoglBitmap *source_bmp;
gboolean ret;
/* Check for valid format */
if (format == COGL_PIXEL_FORMAT_ANY)
return FALSE;
/* Rowstride from width if none specified */
if (rowstride == 0)
rowstride = _cogl_get_format_bpp (format) * width;
/* Init source bitmap */
source_bmp = _cogl_bitmap_new_from_data ((guint8 *) data,
format,
width,
height,
rowstride,
NULL, /* destroy_fn */
NULL); /* destroy_fn_data */
ret = cogl_texture_set_region_from_bitmap (texture,
src_x, src_y,
dst_x, dst_y,
dst_width, dst_height,
source_bmp);
cogl_object_unref (source_bmp);
return ret;
}
/* Reads back the contents of a texture by rendering it to the framebuffer
* and reading back the resulting pixels.
*
* It will perform multiple renders if the texture is larger than the
* current glViewport.
*
* It assumes the projection and modelview have already been setup so
* that rendering to 0,0 with the same width and height of the viewport
* will exactly cover the viewport.
*
* NB: Normally this approach isn't normally used since we can just use
* glGetTexImage, but may be used as a fallback in some circumstances.
*/
static void
do_texture_draw_and_read (CoglTexture *texture,
CoglBitmap *target_bmp,
float *viewport)
{
int bpp;
float rx1, ry1;
float rx2, ry2;
float tx1, ty1;
float tx2, ty2;
int bw, bh;
CoglBitmap *rect_bmp;
unsigned int tex_width, tex_height;
bpp = _cogl_get_format_bpp (COGL_PIXEL_FORMAT_RGBA_8888);
tex_width = cogl_texture_get_width (texture);
tex_height = cogl_texture_get_height (texture);
ry2 = 0;
ty2 = 0;
/* Walk Y axis until whole bitmap height consumed */
for (bh = tex_height; bh > 0; bh -= viewport[3])
{
/* Rectangle Y coords */
ry1 = ry2;
ry2 += (bh < viewport[3]) ? bh : viewport[3];
/* Normalized texture Y coords */
ty1 = ty2;
ty2 = (ry2 / (float) tex_height);
rx2 = 0;
tx2 = 0;
/* Walk X axis until whole bitmap width consumed */
for (bw = tex_width; bw > 0; bw-=viewport[2])
{
int width;
int height;
int rowstride;
guint8 *data;
/* Rectangle X coords */
rx1 = rx2;
rx2 += (bw < viewport[2]) ? bw : viewport[2];
width = rx2 - rx1;
height = ry2 - ry1;
rowstride = width * bpp;
/* Normalized texture X coords */
tx1 = tx2;
tx2 = (rx2 / (float) tex_width);
/* Draw a portion of texture */
cogl_rectangle_with_texture_coords (0, 0,
rx2 - rx1,
ry2 - ry1,
tx1, ty1,
tx2, ty2);
data = g_malloc (height * rowstride);
/* Read into a temporary bitmap */
rect_bmp =
_cogl_bitmap_new_from_data (data,
COGL_PIXEL_FORMAT_RGBA_8888,
width,
height,
rowstride,
(CoglBitmapDestroyNotify) g_free,
NULL);
cogl_read_pixels (viewport[0], viewport[1],
width,
height,
COGL_READ_PIXELS_COLOR_BUFFER,
COGL_PIXEL_FORMAT_RGBA_8888_PRE,
data);
/* Copy to target bitmap */
_cogl_bitmap_copy_subregion (rect_bmp,
target_bmp,
0,0,
rx1,ry1,
width,
height);
/* Free temp bitmap */
cogl_object_unref (rect_bmp);
}
}
}
/* Reads back the contents of a texture by rendering it to the framebuffer
* and reading back the resulting pixels.
*
* NB: Normally this approach isn't normally used since we can just use
* glGetTexImage, but may be used as a fallback in some circumstances.
*/
gboolean
_cogl_texture_draw_and_read (CoglTexture *texture,
CoglBitmap *target_bmp,
GLuint target_gl_format,
GLuint target_gl_type)
{
int bpp;
CoglFramebuffer *framebuffer;
float viewport[4];
CoglBitmap *alpha_bmp;
CoglMatrixStack *projection_stack;
CoglMatrixStack *modelview_stack;
int target_width = _cogl_bitmap_get_width (target_bmp);
int target_height = _cogl_bitmap_get_height (target_bmp);
int target_rowstride = _cogl_bitmap_get_rowstride (target_bmp);
_COGL_GET_CONTEXT (ctx, FALSE);
bpp = _cogl_get_format_bpp (COGL_PIXEL_FORMAT_RGBA_8888);
framebuffer = cogl_get_draw_framebuffer ();
/* Viewport needs to have some size and be inside the window for this */
cogl_framebuffer_get_viewport4fv (framebuffer, viewport);
if (viewport[0] < 0 || viewport[1] < 0 ||
viewport[2] <= 0 || viewport[3] <= 0)
return FALSE;
/* Setup orthographic projection into current viewport (0,0 in top-left
* corner to draw the texture upside-down so we match the way cogl_read_pixels
* works)
*/
projection_stack = _cogl_framebuffer_get_projection_stack (framebuffer);
_cogl_matrix_stack_push (projection_stack);
_cogl_matrix_stack_load_identity (projection_stack);
_cogl_matrix_stack_ortho (projection_stack,
0, viewport[2],
viewport[3], 0,
0,
100);
modelview_stack = _cogl_framebuffer_get_modelview_stack (framebuffer);
_cogl_matrix_stack_push (modelview_stack);
_cogl_matrix_stack_load_identity (modelview_stack);
/* Direct copy operation */
if (ctx->texture_download_pipeline == NULL)
{
ctx->texture_download_pipeline = cogl_pipeline_new ();
cogl_pipeline_set_blend (ctx->texture_download_pipeline,
"RGBA = ADD (SRC_COLOR, 0)",
NULL);
}
_cogl_push_source (ctx->texture_download_pipeline, FALSE);
cogl_pipeline_set_layer_texture (ctx->texture_download_pipeline, 0, texture);
cogl_pipeline_set_layer_combine (ctx->texture_download_pipeline,
0, /* layer */
"RGBA = REPLACE (TEXTURE)",
NULL);
cogl_pipeline_set_layer_filters (ctx->texture_download_pipeline, 0,
COGL_PIPELINE_FILTER_NEAREST,
COGL_PIPELINE_FILTER_NEAREST);
do_texture_draw_and_read (texture, target_bmp, viewport);
/* Check whether texture has alpha and framebuffer not */
/* FIXME: For some reason even if ALPHA_BITS is 8, the framebuffer
still doesn't seem to have an alpha buffer. This might be just
a PowerVR issue.
GLint r_bits, g_bits, b_bits, a_bits;
GE( ctx, glGetIntegerv (GL_ALPHA_BITS, &a_bits) );
GE( ctx, glGetIntegerv (GL_RED_BITS, &r_bits) );
GE( ctx, glGetIntegerv (GL_GREEN_BITS, &g_bits) );
GE( ctx, glGetIntegerv (GL_BLUE_BITS, &b_bits) );
printf ("R bits: %d\n", r_bits);
printf ("G bits: %d\n", g_bits);
printf ("B bits: %d\n", b_bits);
printf ("A bits: %d\n", a_bits); */
if ((cogl_texture_get_format (texture) & COGL_A_BIT)/* && a_bits == 0*/)
{
guint8 *srcdata;
guint8 *dstdata;
guint8 *srcpixel;
guint8 *dstpixel;
int x,y;
int alpha_rowstride = bpp * target_width;
if ((dstdata = _cogl_bitmap_map (target_bmp,
COGL_BUFFER_ACCESS_WRITE,
COGL_BUFFER_MAP_HINT_DISCARD)) == NULL)
return FALSE;
srcdata = g_malloc (alpha_rowstride * target_height);
/* Create temp bitmap for alpha values */
alpha_bmp = _cogl_bitmap_new_from_data (srcdata,
COGL_PIXEL_FORMAT_RGBA_8888,
target_width, target_height,
alpha_rowstride,
(CoglBitmapDestroyNotify) g_free,
NULL);
/* Draw alpha values into RGB channels */
cogl_pipeline_set_layer_combine (ctx->texture_download_pipeline,
0, /* layer */
"RGBA = REPLACE (TEXTURE[A])",
NULL);
do_texture_draw_and_read (texture, alpha_bmp, viewport);
/* Copy temp R to target A */
for (y=0; y<target_height; ++y)
{
for (x=0; x<target_width; ++x)
{
srcpixel = srcdata + x*bpp;
dstpixel = dstdata + x*bpp;
dstpixel[3] = srcpixel[0];
}
srcdata += alpha_rowstride;
dstdata += target_rowstride;
}
_cogl_bitmap_unmap (target_bmp);
cogl_object_unref (alpha_bmp);
}
/* Restore old state */
_cogl_matrix_stack_pop (modelview_stack);
_cogl_matrix_stack_pop (projection_stack);
/* restore the original pipeline */
cogl_pop_source ();
return TRUE;
}
static gboolean
get_texture_bits_via_offscreen (CoglTexture *texture,
int x,
int y,
int width,
int height,
guint8 *dst_bits,
unsigned int dst_rowstride,
CoglPixelFormat dst_format)
{
CoglFramebuffer *framebuffer;
_COGL_GET_CONTEXT (ctx, FALSE);
if (!cogl_has_feature (ctx, COGL_FEATURE_ID_OFFSCREEN))
return FALSE;
framebuffer = _cogl_offscreen_new_to_texture_full
(texture,
COGL_OFFSCREEN_DISABLE_DEPTH_AND_STENCIL,
0);
if (framebuffer == NULL)
return FALSE;
cogl_push_framebuffer (framebuffer);
_cogl_read_pixels_with_rowstride (x, y, width, height,
COGL_READ_PIXELS_COLOR_BUFFER,
dst_format, dst_bits, dst_rowstride);
cogl_pop_framebuffer ();
cogl_object_unref (framebuffer);
return TRUE;
}
static gboolean
get_texture_bits_via_copy (CoglTexture *texture,
int x,
int y,
int width,
int height,
guint8 *dst_bits,
unsigned int dst_rowstride,
CoglPixelFormat dst_format)
{
unsigned int full_rowstride;
guint8 *full_bits;
gboolean ret = TRUE;
int bpp;
int full_tex_width, full_tex_height;
full_tex_width = cogl_texture_get_width (texture);
full_tex_height = cogl_texture_get_height (texture);
bpp = _cogl_get_format_bpp (dst_format);
full_rowstride = bpp * full_tex_width;
full_bits = g_malloc (full_rowstride * full_tex_height);
if (texture->vtable->get_data (texture,
dst_format,
full_rowstride,
full_bits))
{
guint8 *dst = dst_bits;
guint8 *src = full_bits + x * bpp + y * full_rowstride;
int i;
for (i = 0; i < height; i++)
{
memcpy (dst, src, bpp * width);
dst += dst_rowstride;
src += full_rowstride;
}
}
else
ret = FALSE;
g_free (full_bits);
return ret;
}
typedef struct
{
int orig_width;
int orig_height;
CoglBitmap *target_bmp;
guint8 *target_bits;
gboolean success;
} CoglTextureGetData;
static void
texture_get_cb (CoglTexture *texture,
const float *subtexture_coords,
const float *virtual_coords,
void *user_data)
{
CoglTextureGetData *tg_data = user_data;
CoglPixelFormat format = _cogl_bitmap_get_format (tg_data->target_bmp);
int bpp = _cogl_get_format_bpp (format);
unsigned int rowstride = _cogl_bitmap_get_rowstride (tg_data->target_bmp);
int subtexture_width = cogl_texture_get_width (texture);
int subtexture_height = cogl_texture_get_height (texture);
int x_in_subtexture = (int) (0.5 + subtexture_width * subtexture_coords[0]);
int y_in_subtexture = (int) (0.5 + subtexture_height * subtexture_coords[1]);
int width = ((int) (0.5 + subtexture_width * subtexture_coords[2])
- x_in_subtexture);
int height = ((int) (0.5 + subtexture_height * subtexture_coords[3])
- y_in_subtexture);
int x_in_bitmap = (int) (0.5 + tg_data->orig_width * virtual_coords[0]);
int y_in_bitmap = (int) (0.5 + tg_data->orig_height * virtual_coords[1]);
guint8 *dst_bits;
if (!tg_data->success)
return;
dst_bits = tg_data->target_bits + x_in_bitmap * bpp + y_in_bitmap * rowstride;
/* If we can read everything as a single slice, then go ahead and do that
* to avoid allocating an FBO. We'll leave it up to the GL implementation to
* do glGetTexImage as efficiently as possible. (GLES doesn't have that,
* so we'll fall through) */
if (x_in_subtexture == 0 && y_in_subtexture == 0 &&
width == subtexture_width && height == subtexture_height)
{
if (texture->vtable->get_data (texture,
format,
rowstride,
dst_bits))
return;
}
/* Next best option is a FBO and glReadPixels */
if (get_texture_bits_via_offscreen (texture,
x_in_subtexture, y_in_subtexture,
width, height,
dst_bits,
rowstride,
format))
return;
/* Getting ugly: read the entire texture, copy out the part we want */
if (get_texture_bits_via_copy (texture,
x_in_subtexture, y_in_subtexture,
width, height,
dst_bits,
rowstride,
format))
return;
/* No luck, the caller will fall back to the draw-to-backbuffer and
* read implementation */
tg_data->success = FALSE;
}
int
cogl_texture_get_data (CoglTexture *texture,
CoglPixelFormat format,
unsigned int rowstride,
guint8 *data)
{
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;
guint8 *src;
guint8 *dst;
int y;
int tex_width;
int tex_height;
CoglTextureGetData tg_data;
_COGL_GET_CONTEXT (ctx, 0);
/* Default to internal format if none specified */
if (format == COGL_PIXEL_FORMAT_ANY)
format = cogl_texture_get_format (texture);
tex_width = cogl_texture_get_width (texture);
tex_height = cogl_texture_get_height (texture);
/* Rowstride from texture width if none specified */
bpp = _cogl_get_format_bpp (format);
if (rowstride == 0)
rowstride = tex_width * bpp;
/* Return byte size if only that requested */
byte_size = tex_height * rowstride;
if (data == NULL)
return byte_size;
closest_format =
ctx->texture_driver->find_best_gl_get_data_format (format,
&closest_gl_format,
&closest_gl_type);
closest_bpp = _cogl_get_format_bpp (closest_format);
/* Is the requested format supported? */
if (closest_format == format)
/* Target user data directly */
target_bmp = _cogl_bitmap_new_from_data (data,
format,
tex_width,
tex_height,
rowstride,
NULL, NULL);
else
{
int target_rowstride = tex_width * closest_bpp;
guint8 *target_data = g_malloc (tex_height * target_rowstride);
target_bmp = _cogl_bitmap_new_from_data (target_data,
closest_format,
tex_width,
tex_height,
target_rowstride,
(CoglBitmapDestroyNotify) g_free,
NULL);
}
tg_data.orig_width = tex_width;
tg_data.orig_height = tex_height;
tg_data.target_bmp = target_bmp;
tg_data.target_bits = _cogl_bitmap_map (target_bmp, COGL_BUFFER_ACCESS_WRITE,
COGL_BUFFER_MAP_HINT_DISCARD);
if (tg_data.target_bits == NULL)
{
cogl_object_unref (target_bmp);
return 0;
}
tg_data.success = TRUE;
/* Iterating through the subtextures allows piecing together
* the data for a sliced texture, and allows us to do the
* read-from-framebuffer logic here in a simple fashion rather than
* passing offsets down through the code. */
_cogl_texture_foreach_sub_texture_in_region (texture,
0, 0, 1, 1,
texture_get_cb,
&tg_data);
_cogl_bitmap_unmap (target_bmp);
/* XXX: In some cases _cogl_texture_2d_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. */
if (!tg_data.success)
_cogl_texture_draw_and_read (texture, target_bmp,
closest_gl_format,
closest_gl_type);
/* Was intermediate used? */
if (closest_format != format)
{
guint8 *new_bmp_data;
int new_bmp_rowstride;
/* Convert to requested format */
new_bmp = _cogl_bitmap_convert_format_and_premult (target_bmp,
format);
/* Free intermediate data and return if failed */
cogl_object_unref (target_bmp);
if (new_bmp == NULL)
return 0;
new_bmp_rowstride = _cogl_bitmap_get_rowstride (new_bmp);
new_bmp_data = _cogl_bitmap_map (new_bmp, COGL_BUFFER_ACCESS_WRITE,
COGL_BUFFER_MAP_HINT_DISCARD);
if (new_bmp_data == NULL)
{
cogl_object_unref (new_bmp);
return 0;
}
/* Copy to user buffer */
for (y = 0; y < tex_height; ++y)
{
src = new_bmp_data + y * new_bmp_rowstride;
dst = data + y * rowstride;
memcpy (dst, src, tex_width * bpp);
}
_cogl_bitmap_unmap (new_bmp);
/* Free converted data */
cogl_object_unref (new_bmp);
}
return byte_size;
}
static void
_cogl_texture_framebuffer_destroy_cb (void *user_data,
void *instance)
{
CoglTexture *tex = user_data;
CoglFramebuffer *framebuffer = instance;
tex->framebuffers = g_list_remove (tex->framebuffers, framebuffer);
}
void
_cogl_texture_associate_framebuffer (CoglTexture *texture,
CoglFramebuffer *framebuffer)
{
static CoglUserDataKey framebuffer_destroy_notify_key;
/* Note: we don't take a reference on the framebuffer here because
* that would introduce a circular reference. */
texture->framebuffers = g_list_prepend (texture->framebuffers, framebuffer);
/* Since we haven't taken a reference on the framebuffer we setup
* some private data so we will be notified if it is destroyed... */
_cogl_object_set_user_data (COGL_OBJECT (framebuffer),
&framebuffer_destroy_notify_key,
texture,
_cogl_texture_framebuffer_destroy_cb);
}
const GList *
_cogl_texture_get_associated_framebuffers (CoglTexture *texture)
{
return texture->framebuffers;
}
void
_cogl_texture_flush_journal_rendering (CoglTexture *texture)
{
GList *l;
/* It could be that a referenced texture is part of a framebuffer
* which has an associated journal that must be flushed before it
* can be sampled from by the current primitive... */
for (l = texture->framebuffers; l; l = l->next)
_cogl_framebuffer_flush_journal (l->data);
}
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