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mutter/cogl/cogl-texture-2d.c
Neil Roberts 05d42ed390 cogl: Add a CoglTexture2D backend 
This is an optimised version of CoglTexture2DSliced that always deals
with a single texture and always uses the GL_TEXTURE_2D
target. cogl_texture_new_from_bitmap now tries to use this backend
first. If it can't create a texture with that size then it falls back
the sliced backend.

cogl_texture_upload_data_prepare has been split into two functions
because the sliced backend needs to know the real internal format
before the conversion is performed. Otherwise the converted bitmap
will be wasted if the backend can't support the size.
2009-12-02 22:03:27 +00:00

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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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* 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 <string.h>
#include <math.h>
static void _cogl_texture_2d_free (CoglTexture2D *tex_2d);
COGL_HANDLE_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 (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_parameter (CoglTexture *tex,
GLenum wrap_mode)
{
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 */
if (tex_2d->wrap_mode != wrap_mode)
{
/* Any queued texture rectangles may be depending on the
* previous wrap mode... */
_cogl_journal_flush ();
GE( glBindTexture (GL_TEXTURE_2D, tex_2d->gl_texture) );
GE( glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wrap_mode) );
GE( glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrap_mode) );
tex_2d->wrap_mode = wrap_mode;
}
}
static void
_cogl_texture_2d_free (CoglTexture2D *tex_2d)
{
GE( glDeleteTextures (1, &tex_2d->gl_texture) );
g_free (tex_2d);
}
static gboolean
_cogl_texture_2d_is_pot (unsigned int num)
{
gboolean have_bit = FALSE;
/* Make sure there is only one bit set */
while (num)
{
if (num & 1)
{
if (have_bit)
return FALSE;
have_bit = TRUE;
}
num >>= 1;
}
return TRUE;
}
static gboolean
_cogl_texture_2d_can_create (unsigned int width,
unsigned int height,
CoglPixelFormat internal_format)
{
GLenum gl_intformat;
GLenum gl_type;
/* If the driver doesn't support glGenerateMipmap then we need to
store a copy of the first pixels to cause an update. Instead of
duplicating the code here we'll just make it fallback to
CoglTexture2DSliced */
if (!cogl_features_available (COGL_FEATURE_OFFSCREEN))
return FALSE;
/* If NPOT textures aren't supported then the size must be a power
of two */
if (!cogl_features_available (COGL_FEATURE_TEXTURE_NPOT) &&
(!_cogl_texture_2d_is_pot (width) ||
!_cogl_texture_2d_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;
/* Unknown filter */
tex_2d->min_filter = GL_FALSE;
tex_2d->mag_filter = GL_FALSE;
/* Wrap mode not yet set */
tex_2d->wrap_mode = 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);
GE( glGenTextures (1, &tex_2d->gl_texture) );
GE( glBindTexture (GL_TEXTURE_2D, tex_2d->gl_texture) );
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 (CoglHandle bmp_handle,
CoglTextureFlags flags,
CoglPixelFormat internal_format)
{
CoglTexture2D *tex_2d;
CoglBitmap *bmp = (CoglBitmap *)bmp_handle;
CoglTextureUploadData upload_data;
g_return_val_if_fail (bmp_handle != COGL_INVALID_HANDLE, COGL_INVALID_HANDLE);
upload_data.bitmap = *bmp;
upload_data.bitmap_owner = FALSE;
if (!_cogl_texture_upload_data_prepare_format (&upload_data,
&internal_format) ||
!_cogl_texture_2d_can_create (upload_data.bitmap.width,
upload_data.bitmap.height,
internal_format) ||
!_cogl_texture_upload_data_convert (&upload_data, internal_format))
{
_cogl_texture_upload_data_free (&upload_data);
return COGL_INVALID_HANDLE;
}
tex_2d = _cogl_texture_2d_create_base (upload_data.bitmap.width,
upload_data.bitmap.height,
flags,
upload_data.bitmap.format);
GE( glGenTextures (1, &tex_2d->gl_texture) );
_cogl_texture_driver_upload_to_gl (GL_TEXTURE_2D,
tex_2d->gl_texture,
&upload_data.bitmap,
upload_data.gl_intformat,
upload_data.gl_format,
upload_data.gl_type);
tex_2d->gl_format = upload_data.gl_intformat;
_cogl_texture_upload_data_free (&upload_data);
return _cogl_texture_2d_handle_new (tex_2d);
}
static gint
_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 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 */
GE( glBindTexture (GL_TEXTURE_2D, tex_2d->gl_texture) );
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_ensure_mipmaps (CoglTexture *tex)
{
CoglTexture2D *tex_2d = COGL_TEXTURE_2D (tex);
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
/* Only update if the mipmaps are dirty */
if (!tex_2d->auto_mipmap || !tex_2d->mipmaps_dirty)
return;
GE( glBindTexture (GL_TEXTURE_2D, tex_2d->gl_texture) );
/* glGenerateMipmap is defined in the FBO extension. We only allow
CoglTexture2D instances to be created if this feature is
available so we don't need to check for the extension */
_cogl_texture_driver_gl_generate_mipmaps (GL_TEXTURE_2D);
tex_2d->mipmaps_dirty = FALSE;
}
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,
int width,
int height,
CoglPixelFormat format,
unsigned int rowstride,
const guint8 *data)
{
CoglTexture2D *tex_2d = COGL_TEXTURE_2D (tex);
gint bpp;
CoglBitmap source_bmp;
CoglBitmap temp_bmp;
gboolean source_bmp_owner = FALSE;
CoglPixelFormat closest_format;
GLenum closest_gl_format;
GLenum closest_gl_type;
gboolean success;
/* 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 = (guchar*) data;
/* Rowstride from width if none specified */
bpp = _cogl_get_format_bpp (format);
source_bmp.rowstride = (rowstride == 0) ? width * bpp : rowstride;
/* Find closest format to internal that's supported by GL */
closest_format = _cogl_pixel_format_to_gl (tex_2d->format,
NULL, /* don't need */
&closest_gl_format,
&closest_gl_type);
/* If no direct match, convert */
if (closest_format != format)
{
/* Convert to required format */
success = _cogl_bitmap_convert_and_premult (&source_bmp,
&temp_bmp,
closest_format);
/* Swap bitmaps if succeeded */
if (!success) return FALSE;
source_bmp = temp_bmp;
source_bmp_owner = TRUE;
}
/* Send data to GL */
_cogl_texture_driver_upload_subregion_to_gl (GL_TEXTURE_2D,
tex_2d->gl_texture,
src_x, src_y,
dst_x, dst_y,
dst_width, dst_height,
&source_bmp,
closest_gl_format,
closest_gl_type);
/* Free data if owner */
if (source_bmp_owner)
g_free (source_bmp.data);
return TRUE;
}
static int
_cogl_texture_2d_get_data (CoglTexture *tex,
CoglPixelFormat format,
unsigned int rowstride,
guint8 *data)
{
CoglTexture2D *tex_2d = COGL_TEXTURE_2D (tex);
gint bpp;
gint byte_size;
CoglPixelFormat closest_format;
gint closest_bpp;
GLenum closest_gl_format;
GLenum closest_gl_type;
CoglBitmap target_bmp;
CoglBitmap new_bmp;
gboolean success;
guchar *src;
guchar *dst;
gint y;
/* Default to internal format if none specified */
if (format == COGL_PIXEL_FORMAT_ANY)
format = tex_2d->format;
/* Rowstride from texture width if none specified */
bpp = _cogl_get_format_bpp (format);
if (rowstride == 0) rowstride = tex_2d->width * bpp;
/* Return byte size if only that requested */
byte_size = tex_2d->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_2d->width;
target_bmp.height = tex_2d->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 = (guchar*) g_malloc (target_bmp.height
* target_bmp.rowstride);
}
GE( glBindTexture (GL_TEXTURE_2D, tex_2d->gl_texture) );
if (!_cogl_texture_driver_gl_get_tex_image (GL_TEXTURE_2D,
closest_gl_format,
closest_gl_type,
target_bmp.data))
{
/* 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. */
_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_and_premult (&target_bmp,
&new_bmp,
format);
/* Free intermediate data and return if failed */
g_free (target_bmp.data);
if (!success) return 0;
/* Copy to user buffer */
for (y = 0; y < new_bmp.height; ++y)
{
src = new_bmp.data + y * new_bmp.rowstride;
dst = data + y * rowstride;
memcpy (dst, src, new_bmp.width);
}
/* Free converted data */
g_free (new_bmp.data);
}
return byte_size;
}
static CoglPixelFormat
_cogl_texture_2d_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 gint
_cogl_texture_2d_get_width (CoglTexture *tex)
{
return COGL_TEXTURE_2D (tex)->width;
}
static gint
_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_get_gl_texture,
_cogl_texture_2d_set_filters,
_cogl_texture_2d_ensure_mipmaps,
_cogl_texture_2d_set_wrap_mode_parameter,
_cogl_texture_2d_get_format,
_cogl_texture_2d_get_gl_format,
_cogl_texture_2d_get_width,
_cogl_texture_2d_get_height
};
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