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mutter/cogl/cogl-texture-2d.c
Neil Roberts ccc3068ffd cogl-bitmap: Encapsulate the CoglBitmap even internally 
The CoglBitmap struct is now only defined within cogl-bitmap.c so that
all of its members can now only be accessed with accessor
functions. To get to the data pointer for the bitmap image you must
first call _cogl_bitmap_map and later call _cogl_bitmap_unmap. The map
function takes the same arguments as cogl_pixel_array_map so that
eventually we can make a bitmap optionally internally divert to a
pixel array.

There is a _cogl_bitmap_new_from_data function which constructs a new
bitmap object and takes ownership of the data pointer. The function
gets passed a destroy callback which gets called when the bitmap is
freed. This is similar to how gdk_pixbuf_new_from_data
works. Alternatively NULL can be passed for the destroy function which
means that the caller will manage the life of the pointer (but must
guarantee that it stays alive at least until the bitmap is
freed). This mechanism is used instead of the old approach of creating
a CoglBitmap struct on the stack and manually filling in the
members. It could also later be used to create a CoglBitmap that owns
a GdkPixbuf ref so that we don't necessarily have to copy the
GdkPixbuf data when converting to a bitmap.

There is also _cogl_bitmap_new_shared. This creates a bitmap using a
reference to another CoglBitmap for the data. This is a bit of a hack
but it is needed by the atlas texture backend which wants to divert
the set_region virtual to another texture but it needs to override the
format of the bitmap to ignore the premult flag.
2010-07-15 17:24:01 +01:00

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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 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:
* Neil Roberts <neil@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl.h"
#include "cogl-internal.h"
#include "cogl-util.h"
#include "cogl-texture-private.h"
#include "cogl-texture-2d-private.h"
#include "cogl-texture-driver.h"
#include "cogl-context.h"
#include "cogl-handle.h"
#include "cogl-journal-private.h"
#include "cogl-material-opengl-private.h"
#include <string.h>
#include <math.h>
static void _cogl_texture_2d_free (CoglTexture2D *tex_2d);
COGL_TEXTURE_INTERNAL_DEFINE (Texture2D, texture_2d);
static const CoglTextureVtable cogl_texture_2d_vtable;
typedef struct _CoglTexture2DManualRepeatData
{
CoglTexture2D *tex_2d;
CoglTextureSliceCallback callback;
void *user_data;
} CoglTexture2DManualRepeatData;
static void
_cogl_texture_2d_wrap_coords (float t_1, float t_2,
float *out_t_1, float *out_t_2)
{
float int_part;
/* Wrap t_1 and t_2 to the range [0,1] */
modff (t_1 < t_2 ? t_1 : t_2, &int_part);
t_1 -= int_part;
t_2 -= int_part;
if (cogl_util_float_signbit (int_part))
{
*out_t_1 = 1.0f + t_1;
*out_t_2 = 1.0f + t_2;
}
else
{
*out_t_1 = t_1;
*out_t_2 = t_2;
}
}
static void
_cogl_texture_2d_manual_repeat_cb (const float *coords,
void *user_data)
{
CoglTexture2DManualRepeatData *data = user_data;
float slice_coords[4];
_cogl_texture_2d_wrap_coords (coords[0], coords[2],
slice_coords + 0, slice_coords + 2);
_cogl_texture_2d_wrap_coords (coords[1], coords[3],
slice_coords + 1, slice_coords + 3);
data->callback (COGL_TEXTURE (data->tex_2d),
data->tex_2d->gl_texture,
GL_TEXTURE_2D,
slice_coords,
coords,
data->user_data);
}
static void
_cogl_texture_2d_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)
{
CoglTexture2D *tex_2d = COGL_TEXTURE_2D (tex);
CoglTexture2DManualRepeatData data;
data.tex_2d = tex_2d;
data.callback = callback;
data.user_data = user_data;
/* We need to implement manual repeating because if Cogl is calling
this function then it will set the wrap mode to GL_CLAMP_TO_EDGE
and hardware repeating can't be done */
_cogl_texture_iterate_manual_repeats (_cogl_texture_2d_manual_repeat_cb,
virtual_tx_1, virtual_ty_1,
virtual_tx_2, virtual_ty_2,
&data);
}
static void
_cogl_texture_2d_set_wrap_mode_parameters (CoglTexture *tex,
GLenum wrap_mode_s,
GLenum wrap_mode_t,
GLenum wrap_mode_p)
{
CoglTexture2D *tex_2d = COGL_TEXTURE_2D (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_2d->wrap_mode_s != wrap_mode_s ||
tex_2d->wrap_mode_t != wrap_mode_t)
{
_cogl_bind_gl_texture_transient (GL_TEXTURE_2D,
tex_2d->gl_texture,
FALSE);
GE( glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wrap_mode_s) );
GE( glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrap_mode_t) );
tex_2d->wrap_mode_s = wrap_mode_s;
tex_2d->wrap_mode_t = wrap_mode_t;
}
}
static void
_cogl_texture_2d_free (CoglTexture2D *tex_2d)
{
_cogl_delete_gl_texture (tex_2d->gl_texture);
/* Chain up */
_cogl_texture_free (COGL_TEXTURE (tex_2d));
}
static gboolean
_cogl_texture_2d_can_create (unsigned int width,
unsigned int height,
CoglPixelFormat internal_format)
{
GLenum gl_intformat;
GLenum gl_type;
/* If NPOT textures aren't supported then the size must be a power
of two */
if (!cogl_features_available (COGL_FEATURE_TEXTURE_NPOT) &&
(!_cogl_util_is_pot (width) ||
!_cogl_util_is_pot (height)))
return FALSE;
_cogl_pixel_format_to_gl (internal_format,
&gl_intformat,
NULL,
&gl_type);
/* Check that the driver can create a texture with that size */
if (!_cogl_texture_driver_size_supported (GL_TEXTURE_2D,
gl_intformat,
gl_type,
width,
height))
return FALSE;
return TRUE;
}
static CoglTexture2D *
_cogl_texture_2d_create_base (unsigned int width,
unsigned int height,
CoglTextureFlags flags,
CoglPixelFormat internal_format)
{
CoglTexture2D *tex_2d = g_new (CoglTexture2D, 1);
CoglTexture *tex = COGL_TEXTURE (tex_2d);
tex->vtable = &cogl_texture_2d_vtable;
tex_2d->width = width;
tex_2d->height = height;
tex_2d->mipmaps_dirty = TRUE;
tex_2d->auto_mipmap = (flags & COGL_TEXTURE_NO_AUTO_MIPMAP) == 0;
/* We default to GL_LINEAR for both filters */
tex_2d->min_filter = GL_LINEAR;
tex_2d->mag_filter = GL_LINEAR;
/* Wrap mode not yet set */
tex_2d->wrap_mode_s = GL_FALSE;
tex_2d->wrap_mode_t = GL_FALSE;
tex_2d->format = internal_format;
return tex_2d;
}
CoglHandle
_cogl_texture_2d_new_with_size (unsigned int width,
unsigned int height,
CoglTextureFlags flags,
CoglPixelFormat internal_format)
{
CoglTexture2D *tex_2d;
GLenum gl_intformat;
GLenum gl_format;
GLenum gl_type;
/* Since no data, we need some internal format */
if (internal_format == COGL_PIXEL_FORMAT_ANY)
internal_format = COGL_PIXEL_FORMAT_RGBA_8888_PRE;
if (!_cogl_texture_2d_can_create (width, height, internal_format))
return COGL_INVALID_HANDLE;
internal_format = _cogl_pixel_format_to_gl (internal_format,
&gl_intformat,
&gl_format,
&gl_type);
tex_2d = _cogl_texture_2d_create_base (width, height, flags, internal_format);
_cogl_texture_driver_gen (GL_TEXTURE_2D, 1, &tex_2d->gl_texture);
_cogl_bind_gl_texture_transient (GL_TEXTURE_2D,
tex_2d->gl_texture,
FALSE);
GE( glTexImage2D (GL_TEXTURE_2D, 0, gl_intformat,
width, height, 0, gl_format, gl_type, NULL) );
return _cogl_texture_2d_handle_new (tex_2d);
}
CoglHandle
_cogl_texture_2d_new_from_bitmap (CoglBitmap *bmp,
CoglTextureFlags flags,
CoglPixelFormat internal_format)
{
CoglTexture2D *tex_2d;
CoglBitmap *dst_bmp;
GLenum gl_intformat;
GLenum gl_format;
GLenum gl_type;
guint8 *data;
g_return_val_if_fail (bmp != NULL, COGL_INVALID_HANDLE);
internal_format =
_cogl_texture_determine_internal_format (_cogl_bitmap_get_format (bmp),
internal_format);
if (!_cogl_texture_2d_can_create (_cogl_bitmap_get_width (bmp),
_cogl_bitmap_get_height (bmp),
internal_format))
return COGL_INVALID_HANDLE;
if ((dst_bmp = _cogl_texture_prepare_for_upload (bmp,
internal_format,
&internal_format,
&gl_intformat,
&gl_format,
&gl_type)) == NULL)
return COGL_INVALID_HANDLE;
tex_2d = _cogl_texture_2d_create_base (_cogl_bitmap_get_width (bmp),
_cogl_bitmap_get_height (bmp),
flags,
internal_format);
/* Keep a copy of the first pixel so that if glGenerateMipmap isn't
supported we can fallback to using GL_GENERATE_MIPMAP */
if (!cogl_features_available (COGL_FEATURE_OFFSCREEN) &&
(data = _cogl_bitmap_map (dst_bmp,
COGL_BUFFER_ACCESS_READ, 0)))
{
tex_2d->first_pixel.gl_format = gl_format;
tex_2d->first_pixel.gl_type = gl_type;
memcpy (tex_2d->first_pixel.data, data,
_cogl_get_format_bpp (_cogl_bitmap_get_format (dst_bmp)));
_cogl_bitmap_unmap (dst_bmp);
}
_cogl_texture_driver_gen (GL_TEXTURE_2D, 1, &tex_2d->gl_texture);
_cogl_texture_driver_upload_to_gl (GL_TEXTURE_2D,
tex_2d->gl_texture,
FALSE,
dst_bmp,
gl_intformat,
gl_format,
gl_type);
tex_2d->gl_format = gl_intformat;
cogl_object_unref (dst_bmp);
return _cogl_texture_2d_handle_new (tex_2d);
}
void
_cogl_texture_2d_externally_modified (CoglHandle handle)
{
if (!_cogl_is_texture_2d (handle))
return;
COGL_TEXTURE_2D (handle)->mipmaps_dirty = TRUE;
}
static int
_cogl_texture_2d_get_max_waste (CoglTexture *tex)
{
return -1;
}
static gboolean
_cogl_texture_2d_is_sliced (CoglTexture *tex)
{
return FALSE;
}
static gboolean
_cogl_texture_2d_can_hardware_repeat (CoglTexture *tex)
{
return TRUE;
}
static void
_cogl_texture_2d_transform_coords_to_gl (CoglTexture *tex,
float *s,
float *t)
{
/* The texture coordinates map directly so we don't need to do
anything */
}
static CoglTransformResult
_cogl_texture_2d_transform_quad_coords_to_gl (CoglTexture *tex,
float *coords)
{
/* The texture coordinates map directly so we don't need to do
anything other than check for repeats */
gboolean need_repeat = FALSE;
int i;
for (i = 0; i < 4; i++)
if (coords[i] < 0.0f || coords[i] > 1.0f)
need_repeat = TRUE;
return (need_repeat ? COGL_TRANSFORM_HARDWARE_REPEAT
: COGL_TRANSFORM_NO_REPEAT);
}
static gboolean
_cogl_texture_2d_get_gl_texture (CoglTexture *tex,
GLuint *out_gl_handle,
GLenum *out_gl_target)
{
CoglTexture2D *tex_2d = COGL_TEXTURE_2D (tex);
if (out_gl_handle)
*out_gl_handle = tex_2d->gl_texture;
if (out_gl_target)
*out_gl_target = GL_TEXTURE_2D;
return TRUE;
}
static void
_cogl_texture_2d_set_filters (CoglTexture *tex,
GLenum min_filter,
GLenum mag_filter)
{
CoglTexture2D *tex_2d = COGL_TEXTURE_2D (tex);
if (min_filter == tex_2d->min_filter
&& mag_filter == tex_2d->mag_filter)
return;
/* Store new values */
tex_2d->min_filter = min_filter;
tex_2d->mag_filter = mag_filter;
/* Apply new filters to the texture */
_cogl_bind_gl_texture_transient (GL_TEXTURE_2D,
tex_2d->gl_texture,
FALSE);
GE( glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mag_filter) );
GE( glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, min_filter) );
}
static void
_cogl_texture_2d_pre_paint (CoglTexture *tex, CoglTexturePrePaintFlags flags)
{
CoglTexture2D *tex_2d = COGL_TEXTURE_2D (tex);
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
/* Only update if the mipmaps are dirty */
if ((flags & COGL_TEXTURE_NEEDS_MIPMAP) &&
tex_2d->auto_mipmap && tex_2d->mipmaps_dirty)
{
_cogl_bind_gl_texture_transient (GL_TEXTURE_2D,
tex_2d->gl_texture,
FALSE);
/* glGenerateMipmap is defined in the FBO extension. If it's not
available we'll fallback to temporarily enabling
GL_GENERATE_MIPMAP and reuploading the first pixel */
if (cogl_features_available (COGL_FEATURE_OFFSCREEN))
_cogl_texture_driver_gl_generate_mipmaps (GL_TEXTURE_2D);
else
{
GE( glTexParameteri (GL_TEXTURE_2D,
GL_GENERATE_MIPMAP,
GL_TRUE) );
GE( glTexSubImage2D (GL_TEXTURE_2D, 0, 0, 0, 1, 1,
tex_2d->first_pixel.gl_format,
tex_2d->first_pixel.gl_type,
tex_2d->first_pixel.data) );
GE( glTexParameteri (GL_TEXTURE_2D,
GL_GENERATE_MIPMAP,
GL_FALSE) );
}
tex_2d->mipmaps_dirty = FALSE;
}
}
static void
_cogl_texture_2d_ensure_non_quad_rendering (CoglTexture *tex)
{
/* Nothing needs to be done */
}
static gboolean
_cogl_texture_2d_set_region (CoglTexture *tex,
int src_x,
int src_y,
int dst_x,
int dst_y,
unsigned int dst_width,
unsigned int dst_height,
CoglBitmap *bmp)
{
CoglTexture2D *tex_2d = COGL_TEXTURE_2D (tex);
GLenum gl_format;
GLenum gl_type;
guint8 *data;
_cogl_pixel_format_to_gl (_cogl_bitmap_get_format (bmp),
NULL, /* internal format */
&gl_format,
&gl_type);
/* If this touches the first pixel then we'll update our copy */
if (dst_x == 0 && dst_y == 0 &&
!cogl_features_available (COGL_FEATURE_OFFSCREEN) &&
(data = _cogl_bitmap_map (bmp, COGL_BUFFER_ACCESS_READ, 0)))
{
CoglPixelFormat bpp =
_cogl_get_format_bpp (_cogl_bitmap_get_format (bmp));
tex_2d->first_pixel.gl_format = gl_format;
tex_2d->first_pixel.gl_type = gl_type;
memcpy (tex_2d->first_pixel.data,
data + _cogl_bitmap_get_rowstride (bmp) * src_y + bpp * src_x,
bpp);
_cogl_bitmap_unmap (bmp);
}
/* Send data to GL */
_cogl_texture_driver_upload_subregion_to_gl (GL_TEXTURE_2D,
tex_2d->gl_texture,
FALSE,
src_x, src_y,
dst_x, dst_y,
dst_width, dst_height,
bmp,
gl_format,
gl_type);
tex_2d->mipmaps_dirty = TRUE;
return TRUE;
}
static gboolean
_cogl_texture_2d_get_data (CoglTexture *tex,
CoglPixelFormat format,
unsigned int rowstride,
guint8 *data)
{
CoglTexture2D *tex_2d = COGL_TEXTURE_2D (tex);
int bpp;
GLenum gl_format;
GLenum gl_type;
bpp = _cogl_get_format_bpp (format);
_cogl_pixel_format_to_gl (format,
NULL, /* internal format */
&gl_format,
&gl_type);
_cogl_texture_driver_prep_gl_for_pixels_download (rowstride, bpp);
_cogl_bind_gl_texture_transient (GL_TEXTURE_2D,
tex_2d->gl_texture,
FALSE);
return _cogl_texture_driver_gl_get_tex_image (GL_TEXTURE_2D,
gl_format,
gl_type,
data);
}
static CoglPixelFormat
_cogl_texture_2d_get_format (CoglTexture *tex)
{
return COGL_TEXTURE_2D (tex)->format;
}
static GLenum
_cogl_texture_2d_get_gl_format (CoglTexture *tex)
{
return COGL_TEXTURE_2D (tex)->gl_format;
}
static int
_cogl_texture_2d_get_width (CoglTexture *tex)
{
return COGL_TEXTURE_2D (tex)->width;
}
static int
_cogl_texture_2d_get_height (CoglTexture *tex)
{
return COGL_TEXTURE_2D (tex)->height;
}
static const CoglTextureVtable
cogl_texture_2d_vtable =
{
_cogl_texture_2d_set_region,
_cogl_texture_2d_get_data,
_cogl_texture_2d_foreach_sub_texture_in_region,
_cogl_texture_2d_get_max_waste,
_cogl_texture_2d_is_sliced,
_cogl_texture_2d_can_hardware_repeat,
_cogl_texture_2d_transform_coords_to_gl,
_cogl_texture_2d_transform_quad_coords_to_gl,
_cogl_texture_2d_get_gl_texture,
_cogl_texture_2d_set_filters,
_cogl_texture_2d_pre_paint,
_cogl_texture_2d_ensure_non_quad_rendering,
_cogl_texture_2d_set_wrap_mode_parameters,
_cogl_texture_2d_get_format,
_cogl_texture_2d_get_gl_format,
_cogl_texture_2d_get_width,
_cogl_texture_2d_get_height,
NULL /* is_foreign */
};
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