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ccc3068ffd
mutter/cogl/driver/gles/cogl-texture-driver.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) 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-material.h"
#include "cogl-material-opengl-private.h"
#include "cogl-context.h"
#include "cogl-handle.h"
#include "cogl-primitives.h"
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include "cogl-gles2-wrapper.h"
#define glTexImage3D ctx->drv.pf_glTexImage3D
#define glTexSubImage3D ctx->drv.pf_glTexSubImage3D
#ifndef GL_TEXTURE_3D
#define GL_TEXTURE_3D 0x806F
#endif
#ifndef GL_MAX_3D_TEXTURE_SIZE_OES
#define GL_MAX_3D_TEXTURE_SIZE_OES 0x8073
#endif
void
_cogl_texture_driver_gen (GLenum gl_target,
GLsizei n,
GLuint *textures)
{
unsigned int i;
GE (glGenTextures (n, textures));
for (i = 0; i < n; i++)
{
_cogl_bind_gl_texture_transient (gl_target, textures[i], FALSE);
switch (gl_target)
{
case GL_TEXTURE_2D:
case GL_TEXTURE_3D:
/* GL_TEXTURE_MAG_FILTER defaults to GL_LINEAR, no need to set it */
GE( glTexParameteri (gl_target, GL_TEXTURE_MIN_FILTER, GL_LINEAR) );
break;
default:
g_assert_not_reached();
}
}
}
void
_cogl_texture_driver_prep_gl_for_pixels_upload (int pixels_rowstride,
int pixels_bpp)
{
_cogl_texture_prep_gl_alignment_for_pixels_upload (pixels_rowstride);
}
void
_cogl_texture_driver_prep_gl_for_pixels_download (int pixels_rowstride,
int pixels_bpp)
{
_cogl_texture_prep_gl_alignment_for_pixels_download (pixels_rowstride);
}
void
_cogl_texture_driver_upload_subregion_to_gl (GLenum gl_target,
GLuint gl_handle,
gboolean is_foreign,
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)
{
guint8 *data;
CoglPixelFormat source_format = _cogl_bitmap_get_format (source_bmp);
int bpp = _cogl_get_format_bpp (source_format);
CoglBitmap *slice_bmp;
int rowstride;
/* NB: GLES doesn't support the GL_UNPACK_ROW_LENGTH,
* GL_UNPACK_SKIP_PIXELS or GL_UNPACK_SKIP_ROWS pixel store options
* so we can't directly source a sub-region from source_bmp, we need
* to use a transient bitmap instead. */
/* FIXME: optimize by not copying to intermediate slice bitmap when
* source rowstride = bpp * width and the texture image is not
* sliced */
/* Setup temp bitmap for slice subregion */
rowstride = bpp * width;
slice_bmp = _cogl_bitmap_new_from_data (g_malloc (rowstride * height),
source_format,
width,
height,
rowstride,
(CoglBitmapDestroyNotify)
g_free,
NULL);
/* Setup gl alignment to match rowstride and top-left corner */
_cogl_texture_driver_prep_gl_for_pixels_upload (rowstride, bpp);
/* Copy subregion data */
_cogl_bitmap_copy_subregion (source_bmp,
slice_bmp,
src_x,
src_y,
0, 0,
width, height);
if ((data = _cogl_bitmap_map (slice_bmp, COGL_BUFFER_ACCESS_READ, 0)))
{
_cogl_bind_gl_texture_transient (gl_target, gl_handle, is_foreign);
GE( glTexSubImage2D (gl_target, 0,
dst_x, dst_y,
width, height,
source_gl_format,
source_gl_type,
data) );
_cogl_bitmap_unmap (slice_bmp);
}
cogl_object_unref (slice_bmp);
}
void
_cogl_texture_driver_upload_to_gl (GLenum gl_target,
GLuint gl_handle,
gboolean is_foreign,
CoglBitmap *source_bmp,
GLint internal_gl_format,
GLuint source_gl_format,
GLuint source_gl_type)
{
int bpp = _cogl_get_format_bpp (_cogl_bitmap_get_format (source_bmp));
int rowstride = _cogl_bitmap_get_rowstride (source_bmp);
int bmp_width = _cogl_bitmap_get_width (source_bmp);
int bmp_height = _cogl_bitmap_get_height (source_bmp);
CoglBitmap *bmp;
guint8 *data;
/* If the rowstride can't be specified with just GL_ALIGNMENT alone
then we need to copy the bitmap because there is no GL_ROW_LENGTH */
if (rowstride / bpp != bmp_width)
{
bmp = _cogl_bitmap_new_from_data (g_malloc (rowstride * bmp_height),
_cogl_bitmap_get_format (source_bmp),
bmp_width,
bmp_height,
rowstride,
(CoglBitmapDestroyNotify) g_free,
NULL);
_cogl_bitmap_copy_subregion (source_bmp,
bmp,
0, 0, 0, 0,
bmp_width,
bmp_height);
}
else
bmp = cogl_object_ref (source_bmp);
/* Setup gl alignment to match rowstride and top-left corner */
_cogl_texture_driver_prep_gl_for_pixels_upload (rowstride, bpp);
_cogl_bind_gl_texture_transient (gl_target, gl_handle, is_foreign);
if ((data = _cogl_bitmap_map (bmp, COGL_BUFFER_ACCESS_READ, 0)))
{
GE( glTexImage2D (gl_target, 0,
internal_gl_format,
bmp_width, bmp_height,
0,
source_gl_format,
source_gl_type,
data) );
_cogl_bitmap_unmap (bmp);
}
cogl_object_unref (bmp);
}
void
_cogl_texture_driver_upload_to_gl_3d (GLenum gl_target,
GLuint gl_handle,
gboolean is_foreign,
GLint height,
GLint depth,
CoglBitmap *source_bmp,
GLint internal_gl_format,
GLuint source_gl_format,
GLuint source_gl_type)
{
int bpp = _cogl_get_format_bpp (_cogl_bitmap_get_format (source_bmp));
int rowstride = _cogl_bitmap_get_rowstride (source_bmp);
int bmp_width = _cogl_bitmap_get_width (source_bmp);
int bmp_height = _cogl_bitmap_get_height (source_bmp);
guint8 *data;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
_cogl_bind_gl_texture_transient (gl_target, gl_handle, is_foreign);
/* If the rowstride or image height can't be specified with just
GL_ALIGNMENT alone then we need to copy the bitmap because there
is no GL_ROW_LENGTH */
if (rowstride / bpp != bmp_width ||
height != bmp_height / depth)
{
CoglBitmap *bmp;
int image_height = bmp_height / depth;
int i;
_cogl_texture_driver_prep_gl_for_pixels_upload (bmp_width * bpp, bpp);
/* Initialize the texture with empty data and then upload each
image with a sub-region update */
GE( glTexImage3D (gl_target,
0, /* level */
internal_gl_format,
bmp_width,
height,
depth,
0,
source_gl_format,
source_gl_type,
NULL) );
bmp = _cogl_bitmap_new_from_data (g_malloc (bpp * bmp_width * height),
_cogl_bitmap_get_format (source_bmp),
bmp_width,
height,
bpp * bmp_width,
(CoglBitmapDestroyNotify) g_free,
NULL);
for (i = 0; i < depth; i++)
{
_cogl_bitmap_copy_subregion (source_bmp,
bmp,
0, image_height * i,
0, 0,
bmp_width,
bmp_height);
if ((data = _cogl_bitmap_map (bmp,
COGL_BUFFER_ACCESS_READ, 0)))
{
GE( glTexSubImage3D (gl_target,
0, /* level */
0, /* xoffset */
0, /* yoffset */
i, /* zoffset */
bmp_width, /* width */
height, /* height */
1, /* depth */
source_gl_format,
source_gl_type,
data) );
_cogl_bitmap_unmap (bmp);
}
}
cogl_object_unref (bmp);
}
else if ((data = _cogl_bitmap_map (source_bmp, COGL_BUFFER_ACCESS_READ, 0)))
{
_cogl_texture_driver_prep_gl_for_pixels_upload (rowstride, bpp);
GE( glTexImage3D (gl_target,
0, /* level */
internal_gl_format,
bmp_width,
height,
depth,
0,
source_gl_format,
source_gl_type,
data) );
_cogl_bitmap_unmap (source_bmp);
}
}
/* NB: GLES doesn't support glGetTexImage2D, so cogl-texture will instead
* fallback to a generic render + readpixels approach to downloading
* texture data. (See _cogl_texture_draw_and_read() ) */
gboolean
_cogl_texture_driver_gl_get_tex_image (GLenum gl_target,
GLenum dest_gl_format,
GLenum dest_gl_type,
guint8 *dest)
{
return FALSE;
}
gboolean
_cogl_texture_driver_size_supported_3d (GLenum gl_target,
GLenum gl_format,
GLenum gl_type,
int width,
int height,
int depth)
{
GLint max_size;
/* GLES doesn't support a proxy texture target so let's at least
check whether the size is greater than
GL_MAX_3D_TEXTURE_SIZE_OES */
GE( glGetIntegerv (GL_MAX_3D_TEXTURE_SIZE_OES, &max_size) );
return width <= max_size && height <= max_size && depth <= max_size;
}
gboolean
_cogl_texture_driver_size_supported (GLenum gl_target,
GLenum gl_format,
GLenum gl_type,
int width,
int height)
{
GLint max_size;
/* GLES doesn't support a proxy texture target so let's at least
check whether the size is greater than GL_MAX_TEXTURE_SIZE */
GE( glGetIntegerv (GL_MAX_TEXTURE_SIZE, &max_size) );
return width <= max_size && height <= max_size;
}
void
_cogl_texture_driver_try_setting_gl_border_color (
GLuint gl_target,
const GLfloat *transparent_color)
{
/* FAIL! */
}
gboolean
_cogl_pixel_format_from_gl_internal (GLenum gl_int_format,
CoglPixelFormat *out_format)
{
return TRUE;
}
CoglPixelFormat
_cogl_pixel_format_to_gl (CoglPixelFormat format,
GLenum *out_glintformat,
GLenum *out_glformat,
GLenum *out_gltype)
{
CoglPixelFormat required_format;
GLenum glintformat = 0;
GLenum glformat = 0;
GLenum gltype = 0;
/* FIXME: check YUV support */
required_format = format;
/* Find GL equivalents */
switch (format & COGL_UNPREMULT_MASK)
{
case COGL_PIXEL_FORMAT_A_8:
glintformat = GL_ALPHA;
glformat = GL_ALPHA;
gltype = GL_UNSIGNED_BYTE;
break;
case COGL_PIXEL_FORMAT_G_8:
glintformat = GL_LUMINANCE;
glformat = GL_LUMINANCE;
gltype = GL_UNSIGNED_BYTE;
break;
/* Just one 24-bit ordering supported */
case COGL_PIXEL_FORMAT_RGB_888:
case COGL_PIXEL_FORMAT_BGR_888:
glintformat = GL_RGB;
glformat = GL_RGB;
gltype = GL_UNSIGNED_BYTE;
required_format = COGL_PIXEL_FORMAT_RGB_888;
break;
/* Just one 32-bit ordering supported */
case COGL_PIXEL_FORMAT_RGBA_8888:
case COGL_PIXEL_FORMAT_BGRA_8888:
case COGL_PIXEL_FORMAT_ARGB_8888:
case COGL_PIXEL_FORMAT_ABGR_8888:
glintformat = GL_RGBA;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_BYTE;
required_format = COGL_PIXEL_FORMAT_RGBA_8888;
required_format |= (format & COGL_PREMULT_BIT);
break;
/* The following three types of channel ordering
* are always defined using system word byte
* ordering (even according to GLES spec) */
case COGL_PIXEL_FORMAT_RGB_565:
glintformat = GL_RGB;
glformat = GL_RGB;
gltype = GL_UNSIGNED_SHORT_5_6_5;
break;
case COGL_PIXEL_FORMAT_RGBA_4444:
glintformat = GL_RGBA;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_SHORT_4_4_4_4;
break;
case COGL_PIXEL_FORMAT_RGBA_5551:
glintformat = GL_RGBA;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_SHORT_5_5_5_1;
break;
/* FIXME: check extensions for YUV support */
default:
break;
}
if (out_glintformat != NULL)
*out_glintformat = glintformat;
if (out_glformat != NULL)
*out_glformat = glformat;
if (out_gltype != NULL)
*out_gltype = gltype;
return required_format;
}
gboolean
_cogl_texture_driver_allows_foreign_gl_target (GLenum gl_target)
{
/* Allow 2-dimensional textures only */
if (gl_target != GL_TEXTURE_2D)
return FALSE;
return TRUE;
}
void
_cogl_texture_driver_gl_generate_mipmaps (GLenum gl_target)
{
GE( _cogl_wrap_glGenerateMipmap (gl_target) );
}
CoglPixelFormat
_cogl_texture_driver_find_best_gl_get_data_format (
CoglPixelFormat format,
GLenum *closest_gl_format,
GLenum *closest_gl_type)
{
/* Find closest format that's supported by GL
(Can't use _cogl_pixel_format_to_gl since available formats
when reading pixels on GLES are severely limited) */
*closest_gl_format = GL_RGBA;
*closest_gl_type = GL_UNSIGNED_BYTE;
return COGL_PIXEL_FORMAT_RGBA_8888;
}
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