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mutter-performance-source/cogl/cogl-blit.c
Neil Roberts c8ddb3b55a cogl-atlas: Try 4 different approaches for migrating textures 
Instead of directly banging GL to migrate textures the atlas now uses
the CoglFramebuffer API. It will use one of four approaches; it can
set up two FBOs and use _cogl_blit_framebuffer to copy between them;
it can use a single target fbo and then render the source texture to
the FBO using a Cogl draw call; it can use a single FBO and call
glCopyTexSubImage2D; or it can fallback to reading all of the texture
data back to system memory and uploading it again with a sub texture
update.

Previously GL calls were used directly because Cogl wasn't able to
create a framebuffer without a stencil and depth buffer. However there
is now an internal version of cogl_offscreen_new_to_texture which
takes a set of flags to disable the two buffers.

The code for blitting has now been moved into a separate file called
cogl-blit.c because it has become quite long and it may be useful
outside of the atlas at some point.

The 4 different methods have a fixed order of preference which is:

* Texture render between two FBOs
* glBlitFramebuffer
* glCopyTexSubImage2D
* glGetTexImage + glTexSubImage2D

Once a method is succesfully used it is tried first for all subsequent
blits. The default default can be overridden by setting the
environment variable COGL_ATLAS_DEFAULT_BLIT_MODE to one of the
following values:

* texture-render
* framebuffer
* copy-tex-sub-image
* get-tex-data
2011-02-15 12:10:54 +00:00

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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2011 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 <string.h>
#include "cogl.h"
#include "cogl-blit.h"
#include "cogl-context.h"
#include "cogl-framebuffer-private.h"
#include "cogl-texture-2d-private.h"
static const CoglBlitMode *_cogl_blit_default_mode = NULL;
static gboolean
_cogl_blit_texture_render_begin (CoglBlitData *data)
{
CoglHandle fbo;
CoglPipeline *pipeline;
unsigned int dst_width, dst_height;
_COGL_GET_CONTEXT (ctx, FALSE);
fbo = _cogl_offscreen_new_to_texture_full
(data->dst_tex, COGL_OFFSCREEN_DISABLE_DEPTH_AND_STENCIL, 0 /* level */);
if (fbo == COGL_INVALID_HANDLE)
return FALSE;
cogl_push_framebuffer (fbo);
cogl_handle_unref (fbo);
dst_width = cogl_texture_get_width (data->dst_tex);
dst_height = cogl_texture_get_height (data->dst_tex);
/* Set up an orthographic projection so we can use pixel
coordinates to render to the texture */
cogl_ortho (0, /* left */
dst_width, /* right */
dst_height, /* bottom */
0, /* top */
-1, /* near */
1 /* far */);
/* We cache a pipeline used for migrating on to the context so
that it doesn't have to continuously regenerate a shader
program */
if (ctx->blit_texture_pipeline == NULL)
{
ctx->blit_texture_pipeline = cogl_pipeline_new ();
cogl_pipeline_set_layer_filters (ctx->blit_texture_pipeline, 0,
COGL_PIPELINE_FILTER_NEAREST,
COGL_PIPELINE_FILTER_NEAREST);
}
pipeline = ctx->blit_texture_pipeline;
cogl_pipeline_set_layer_texture (pipeline, 0, data->src_tex);
cogl_push_source (pipeline);
return TRUE;
}
static void
_cogl_blit_texture_render_blit (CoglBlitData *data,
unsigned int src_x,
unsigned int src_y,
unsigned int dst_x,
unsigned int dst_y,
unsigned int width,
unsigned int height)
{
cogl_rectangle_with_texture_coords (dst_x, dst_y,
dst_x + width,
dst_y + height,
src_x / (float) data->src_width,
src_y / (float) data->src_height,
(src_x + width) /
(float) data->src_width,
(src_y + height) /
(float) data->src_height);
}
static void
_cogl_blit_texture_render_end (CoglBlitData *data)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
cogl_pop_source ();
cogl_pop_framebuffer ();
/* Attach the target texture to the texture render pipeline so that
we don't keep a reference to the source texture forever. This is
assuming that the destination texture will live for a long time
which is currently the case when cogl_blit_* is used from the
atlas code. It may be better in future to keep around a set of
dummy 1x1 textures for each texture target that we could bind
instead. This would also be useful when using a pipeline as a
hash table key such as for the ARBfp program cache. */
cogl_pipeline_set_layer_texture (ctx->blit_texture_pipeline, 0,
data->dst_tex);
}
static gboolean
_cogl_blit_framebuffer_begin (CoglBlitData *data)
{
CoglHandle dst_fbo, src_fbo;
_COGL_GET_CONTEXT (ctx, FALSE);
/* We can only blit between FBOs if both textures are the same
format and the blit framebuffer extension is supported */
if ((cogl_texture_get_format (data->src_tex) & ~COGL_A_BIT) !=
(cogl_texture_get_format (data->dst_tex) & ~COGL_A_BIT) ||
!cogl_features_available (COGL_FEATURE_OFFSCREEN_BLIT))
return FALSE;
dst_fbo = _cogl_offscreen_new_to_texture_full
(data->dst_tex, COGL_OFFSCREEN_DISABLE_DEPTH_AND_STENCIL, 0 /* level */);
if (dst_fbo == COGL_INVALID_HANDLE)
return FALSE;
src_fbo = _cogl_offscreen_new_to_texture_full
(data->src_tex, COGL_OFFSCREEN_DISABLE_DEPTH_AND_STENCIL, 0 /* level */);
if (src_fbo == COGL_INVALID_HANDLE)
{
cogl_handle_unref (dst_fbo);
return FALSE;
}
_cogl_push_framebuffers (dst_fbo, src_fbo);
cogl_handle_unref (src_fbo);
cogl_handle_unref (dst_fbo);
return TRUE;
}
static void
_cogl_blit_framebuffer_blit (CoglBlitData *data,
unsigned int src_x,
unsigned int src_y,
unsigned int dst_x,
unsigned int dst_y,
unsigned int width,
unsigned int height)
{
_cogl_blit_framebuffer (src_x, src_y,
dst_x, dst_y,
width, height);
}
static void
_cogl_blit_framebuffer_end (CoglBlitData *data)
{
cogl_pop_framebuffer ();
}
static gboolean
_cogl_blit_copy_tex_sub_image_begin (CoglBlitData *data)
{
CoglHandle fbo;
_COGL_GET_CONTEXT (ctx, FALSE);
/* This will only work if the target texture is a CoglTexture2D */
if (!_cogl_is_texture_2d (data->dst_tex))
return FALSE;
fbo = _cogl_offscreen_new_to_texture_full
(data->src_tex, COGL_OFFSCREEN_DISABLE_DEPTH_AND_STENCIL, 0 /* level */);
if (fbo == COGL_INVALID_HANDLE)
return FALSE;
cogl_push_framebuffer (fbo);
cogl_handle_unref (fbo);
return TRUE;
}
static void
_cogl_blit_copy_tex_sub_image_blit (CoglBlitData *data,
unsigned int src_x,
unsigned int src_y,
unsigned int dst_x,
unsigned int dst_y,
unsigned int width,
unsigned int height)
{
_cogl_texture_2d_copy_from_framebuffer (data->dst_tex,
dst_x, dst_y,
src_x, src_y,
width, height);
}
static void
_cogl_blit_copy_tex_sub_image_end (CoglBlitData *data)
{
cogl_pop_framebuffer ();
}
static gboolean
_cogl_blit_get_tex_data_begin (CoglBlitData *data)
{
data->format = cogl_texture_get_format (data->src_tex);
data->bpp = _cogl_get_format_bpp (data->format);
data->image_data = g_malloc (data->bpp * data->src_width *
data->src_height);
cogl_texture_get_data (data->src_tex, data->format,
data->src_width * data->bpp, data->image_data);
return TRUE;
}
static void
_cogl_blit_get_tex_data_blit (CoglBlitData *data,
unsigned int src_x,
unsigned int src_y,
unsigned int dst_x,
unsigned int dst_y,
unsigned int width,
unsigned int height)
{
cogl_texture_set_region (data->dst_tex,
src_x, src_y,
dst_x, dst_y,
width, height,
data->src_width, data->src_height,
data->format,
data->src_width * data->bpp,
data->image_data);
}
static void
_cogl_blit_get_tex_data_end (CoglBlitData *data)
{
g_free (data->image_data);
}
/* These should be specified in order of preference */
static const CoglBlitMode
_cogl_blit_modes[] =
{
{
"texture-render",
_cogl_blit_texture_render_begin,
_cogl_blit_texture_render_blit,
_cogl_blit_texture_render_end
},
{
"framebuffer",
_cogl_blit_framebuffer_begin,
_cogl_blit_framebuffer_blit,
_cogl_blit_framebuffer_end
},
{
"copy-tex-sub-image",
_cogl_blit_copy_tex_sub_image_begin,
_cogl_blit_copy_tex_sub_image_blit,
_cogl_blit_copy_tex_sub_image_end
},
{
"get-tex-data",
_cogl_blit_get_tex_data_begin,
_cogl_blit_get_tex_data_blit,
_cogl_blit_get_tex_data_end
}
};
void
_cogl_blit_begin (CoglBlitData *data,
CoglHandle dst_tex,
CoglHandle src_tex)
{
int i;
if (_cogl_blit_default_mode == NULL)
{
const char *default_mode_string;
/* Allow the default to be specified with an environment
variable. For the time being these functions are only used
when blitting between atlas textures so the environment
variable is named to be specific to the atlas code. If we
want to use the code in other places we should create another
environment variable for each specific use case */
if ((default_mode_string = g_getenv ("COGL_ATLAS_DEFAULT_BLIT_MODE")))
{
for (i = 0; i < G_N_ELEMENTS (_cogl_blit_modes); i++)
if (!strcmp (_cogl_blit_modes[i].name, default_mode_string))
{
_cogl_blit_default_mode = _cogl_blit_modes + i;
break;
}
if (i >= G_N_ELEMENTS (_cogl_blit_modes))
{
g_warning ("Unknown blit mode %s", default_mode_string);
_cogl_blit_default_mode = _cogl_blit_modes;
}
}
else
/* Default to the first blit mode */
_cogl_blit_default_mode = _cogl_blit_modes;
}
data->dst_tex = dst_tex;
data->src_tex = src_tex;
data->src_width = cogl_texture_get_width (src_tex);
data->src_height = cogl_texture_get_height (src_tex);
/* Try the default blit mode first */
if (!_cogl_blit_default_mode->begin_func (data))
{
COGL_NOTE (ATLAS, "Failed to set up blit mode %s",
_cogl_blit_default_mode->name);
/* Try all of the other modes in order */
for (i = 0; i < G_N_ELEMENTS (_cogl_blit_modes); i++)
if (_cogl_blit_modes + i != _cogl_blit_default_mode &&
_cogl_blit_modes[i].begin_func (data))
{
/* Use this mode as the default from now on */
_cogl_blit_default_mode = _cogl_blit_modes + i;
break;
}
else
COGL_NOTE (ATLAS,
"Failed to set up blit mode %s",
_cogl_blit_modes[i].name);
/* The last blit mode can't fail so this should never happen */
g_return_if_fail (i < G_N_ELEMENTS (_cogl_blit_modes));
}
data->blit_mode = _cogl_blit_default_mode;
COGL_NOTE (ATLAS, "Setup blit using %s", _cogl_blit_default_mode->name);
}
void
_cogl_blit (CoglBlitData *data,
unsigned int src_x,
unsigned int src_y,
unsigned int dst_x,
unsigned int dst_y,
unsigned int width,
unsigned int height)
{
data->blit_mode->blit_func (data, src_x, src_y, dst_x, dst_y, width, height);
}
void
_cogl_blit_end (CoglBlitData *data)
{
data->blit_mode->end_func (data);
}
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