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mutter/cogl/cogl-context.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) 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/>.
*
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl.h"
#include "cogl-internal.h"
#include "cogl-profile.h"
#include "cogl-util.h"
#include "cogl-context.h"
#include "cogl-journal-private.h"
#include "cogl-texture-private.h"
#include "cogl-pipeline-private.h"
#include "cogl-pipeline-opengl-private.h"
#include "cogl-framebuffer-private.h"
#include "cogl2-path.h"
#include <string.h>
#ifdef HAVE_COGL_GL
#include "cogl-pipeline-fragend-arbfp-private.h"
#define glActiveTexture _context->drv.pf_glActiveTexture
#endif
/* This isn't defined in the GLES headers */
#ifndef GL_POINT_SPRITE
#define GL_POINT_SPRITE 0x8861
#endif
extern void
_cogl_create_context_driver (CoglContext *context);
extern void
_cogl_create_context_winsys (CoglContext *context);
extern void
_cogl_destroy_context_winsys (CoglContext *context);
static CoglContext *_context = NULL;
static gboolean gl_is_indirect = FALSE;
static void
_cogl_init_feature_overrides (CoglContext *ctx)
{
if (G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_VBOS)))
ctx->feature_flags &= ~COGL_FEATURE_VBOS;
if (G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_PBOS)))
ctx->feature_flags &= ~COGL_FEATURE_PBOS;
if (G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_ARBFP)))
ctx->feature_flags &= ~COGL_FEATURE_SHADERS_ARBFP;
if (G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_GLSL)))
ctx->feature_flags &= ~COGL_FEATURE_SHADERS_GLSL;
if (G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_NPOT_TEXTURES)))
ctx->feature_flags &= ~(COGL_FEATURE_TEXTURE_NPOT |
COGL_FEATURE_TEXTURE_NPOT_BASIC |
COGL_FEATURE_TEXTURE_NPOT_MIPMAP |
COGL_FEATURE_TEXTURE_NPOT_REPEAT);
}
static gboolean
cogl_create_context (void)
{
GLubyte default_texture_data[] = { 0xff, 0xff, 0xff, 0x0 };
unsigned long enable_flags = 0;
CoglHandle window_buffer;
int i;
if (_context != NULL)
return FALSE;
#ifdef CLUTTER_ENABLE_PROFILE
/* We need to be absolutely sure that uprof has been initialized
* before calling _cogl_uprof_init. uprof_init (NULL, NULL)
* will be a NOP if it has been initialized but it will also
* mean subsequent parsing of the UProf GOptionGroup will have no
* affect.
*
* Sadly GOptionGroup based library initialization is extremely
* fragile by design because GOptionGroups have no notion of
* dependencies and so the order things are initialized isn't
* currently under tight control.
*/
uprof_init (NULL, NULL);
_cogl_uprof_init ();
#endif
/* Allocate context memory */
_context = (CoglContext*) g_malloc (sizeof (CoglContext));
/* Init default values */
_context->feature_flags = 0;
_context->feature_flags_private = 0;
_context->texture_types = NULL;
_context->buffer_types = NULL;
/* Initialise the driver specific state */
/* TODO: combine these two into one function */
_cogl_create_context_driver (_context);
_cogl_features_init ();
_cogl_init_feature_overrides (_context);
_cogl_create_context_winsys (_context);
_cogl_pipeline_init_default_pipeline ();
_cogl_pipeline_init_default_layers ();
_cogl_pipeline_init_state_hash_functions ();
_cogl_pipeline_init_layer_state_hash_functions ();
_context->enable_flags = 0;
_context->enable_backface_culling = FALSE;
_context->flushed_front_winding = COGL_FRONT_WINDING_COUNTER_CLOCKWISE;
_context->indirect = gl_is_indirect;
cogl_matrix_init_identity (&_context->identity_matrix);
cogl_matrix_init_identity (&_context->y_flip_matrix);
cogl_matrix_scale (&_context->y_flip_matrix, 1, -1, 1);
_context->flushed_matrix_mode = COGL_MATRIX_MODELVIEW;
_context->texture_units =
g_array_new (FALSE, FALSE, sizeof (CoglTextureUnit));
/* See cogl-pipeline.c for more details about why we leave texture unit 1
* active by default... */
_context->active_texture_unit = 1;
GE (glActiveTexture (GL_TEXTURE1));
_context->legacy_fog_state.enabled = FALSE;
_context->opaque_color_pipeline = cogl_pipeline_new ();
_context->blended_color_pipeline = cogl_pipeline_new ();
_context->texture_pipeline = cogl_pipeline_new ();
_context->codegen_header_buffer = g_string_new ("");
_context->codegen_source_buffer = g_string_new ("");
_context->source_stack = NULL;
_context->legacy_state_set = 0;
_context->default_gl_texture_2d_tex = COGL_INVALID_HANDLE;
_context->default_gl_texture_rect_tex = COGL_INVALID_HANDLE;
_context->framebuffers = NULL;
_context->journal_flush_attributes_array =
g_array_new (TRUE, FALSE, sizeof (CoglAttribute *));
_context->journal_clip_bounds = NULL;
_context->polygon_vertices = g_array_new (FALSE, FALSE, sizeof (float));
_context->current_pipeline = NULL;
_context->current_pipeline_changes_since_flush = 0;
_context->current_pipeline_skip_gl_color = FALSE;
_context->pipeline0_nodes =
g_array_sized_new (FALSE, FALSE, sizeof (CoglHandle), 20);
_context->pipeline1_nodes =
g_array_sized_new (FALSE, FALSE, sizeof (CoglHandle), 20);
_cogl_bitmask_init (&_context->arrays_enabled);
_cogl_bitmask_init (&_context->temp_bitmask);
_cogl_bitmask_init (&_context->arrays_to_change);
_context->max_texture_units = -1;
_context->max_texture_image_units = -1;
_context->max_activateable_texture_units = -1;
_context->current_program = COGL_INVALID_HANDLE;
_context->current_fragment_program_type = COGL_PIPELINE_PROGRAM_TYPE_FIXED;
_context->current_vertex_program_type = COGL_PIPELINE_PROGRAM_TYPE_FIXED;
_context->current_gl_program = 0;
_context->gl_blend_enable_cache = FALSE;
_context->depth_test_enabled_cache = FALSE;
_context->depth_test_function_cache = COGL_DEPTH_TEST_FUNCTION_LESS;
_context->depth_writing_enabled_cache = TRUE;
_context->depth_range_near_cache = 0;
_context->depth_range_far_cache = 1;
_context->point_size_cache = 1.0f;
_context->legacy_depth_test_enabled = FALSE;
#ifdef HAVE_COGL_GL
_context->arbfp_cache = g_hash_table_new (_cogl_pipeline_fragend_arbfp_hash,
_cogl_pipeline_fragend_arbfp_equal);
#endif
for (i = 0; i < COGL_BUFFER_BIND_TARGET_COUNT; i++)
_context->current_buffer[i] = NULL;
_context->framebuffer_stack = _cogl_create_framebuffer_stack ();
_context->current_clip_stack_valid = FALSE;
window_buffer = _cogl_onscreen_new ();
cogl_set_framebuffer (window_buffer);
/* XXX: the deprecated _cogl_set_draw_buffer API expects to
* find the window buffer here... */
_context->window_buffer = window_buffer;
_context->dirty_bound_framebuffer = TRUE;
_context->dirty_gl_viewport = TRUE;
_context->current_path = cogl2_path_new ();
_context->stencil_pipeline = cogl_pipeline_new ();
_context->in_begin_gl_block = FALSE;
_context->quad_buffer_indices_byte = COGL_INVALID_HANDLE;
_context->quad_buffer_indices = COGL_INVALID_HANDLE;
_context->quad_buffer_indices_len = 0;
_context->rectangle_byte_indices = NULL;
_context->rectangle_short_indices = NULL;
_context->rectangle_short_indices_len = 0;
_context->texture_download_pipeline = COGL_INVALID_HANDLE;
_context->blit_texture_pipeline = COGL_INVALID_HANDLE;
#ifndef HAVE_COGL_GLES2
/* The default for GL_ALPHA_TEST is to always pass which is equivalent to
* the test being disabled therefore we assume that for all drivers there
* will be no performance impact if we always leave the test enabled which
* makes things a bit simpler for us. Under GLES2 the alpha test is
* implemented in the fragment shader so there is no enable for it
*/
GE (glEnable (GL_ALPHA_TEST));
#endif
#ifdef HAVE_COGL_GLES2
_context->flushed_modelview_stack = NULL;
_context->flushed_projection_stack = NULL;
#endif
/* Create default textures used for fall backs */
_context->default_gl_texture_2d_tex =
cogl_texture_new_from_data (1, /* width */
1, /* height */
COGL_TEXTURE_NO_SLICING,
COGL_PIXEL_FORMAT_RGBA_8888_PRE, /* data format */
/* internal format */
COGL_PIXEL_FORMAT_RGBA_8888_PRE,
0, /* auto calc row stride */
default_texture_data);
_context->default_gl_texture_rect_tex =
cogl_texture_new_from_data (1, /* width */
1, /* height */
COGL_TEXTURE_NO_SLICING,
COGL_PIXEL_FORMAT_RGBA_8888_PRE, /* data format */
/* internal format */
COGL_PIXEL_FORMAT_RGBA_8888_PRE,
0, /* auto calc row stride */
default_texture_data);
cogl_push_source (_context->opaque_color_pipeline);
_cogl_pipeline_flush_gl_state (_context->opaque_color_pipeline, FALSE, 0);
_cogl_enable (enable_flags);
_cogl_flush_face_winding ();
_context->atlases = NULL;
_context->buffer_map_fallback_array = g_byte_array_new ();
_context->buffer_map_fallback_in_use = FALSE;
/* As far as I can tell, GL_POINT_SPRITE doesn't have any effect
unless GL_COORD_REPLACE is enabled for an individual
layer. Therefore it seems like it should be ok to just leave it
enabled all the time instead of having to have a set property on
each pipeline to track whether any layers have point sprite
coords enabled. We don't need to do this for GLES2 because point
sprites are handled using a builtin varying in the shader. */
#ifndef HAVE_COGL_GLES2
if (cogl_features_available (COGL_FEATURE_POINT_SPRITE))
GE (glEnable (GL_POINT_SPRITE));
#endif
return TRUE;
}
void
_cogl_destroy_context (void)
{
if (_context == NULL)
return;
_cogl_destroy_context_winsys (_context);
_cogl_destroy_texture_units ();
_cogl_free_framebuffer_stack (_context->framebuffer_stack);
if (_context->current_path)
cogl_handle_unref (_context->current_path);
if (_context->default_gl_texture_2d_tex)
cogl_handle_unref (_context->default_gl_texture_2d_tex);
if (_context->default_gl_texture_rect_tex)
cogl_handle_unref (_context->default_gl_texture_rect_tex);
if (_context->opaque_color_pipeline)
cogl_handle_unref (_context->opaque_color_pipeline);
if (_context->blended_color_pipeline)
cogl_handle_unref (_context->blended_color_pipeline);
if (_context->texture_pipeline)
cogl_handle_unref (_context->texture_pipeline);
if (_context->blit_texture_pipeline)
cogl_handle_unref (_context->blit_texture_pipeline);
if (_context->journal_flush_attributes_array)
g_array_free (_context->journal_flush_attributes_array, TRUE);
if (_context->journal_clip_bounds)
g_array_free (_context->journal_clip_bounds, TRUE);
if (_context->polygon_vertices)
g_array_free (_context->polygon_vertices, TRUE);
if (_context->quad_buffer_indices_byte)
cogl_handle_unref (_context->quad_buffer_indices_byte);
if (_context->quad_buffer_indices)
cogl_handle_unref (_context->quad_buffer_indices);
if (_context->rectangle_byte_indices)
cogl_object_unref (_context->rectangle_byte_indices);
if (_context->rectangle_short_indices)
cogl_object_unref (_context->rectangle_short_indices);
if (_context->default_pipeline)
cogl_handle_unref (_context->default_pipeline);
if (_context->dummy_layer_dependant)
cogl_handle_unref (_context->dummy_layer_dependant);
if (_context->default_layer_n)
cogl_handle_unref (_context->default_layer_n);
if (_context->default_layer_0)
cogl_handle_unref (_context->default_layer_0);
if (_context->current_clip_stack_valid)
_cogl_clip_stack_unref (_context->current_clip_stack);
g_slist_free (_context->atlases);
_cogl_bitmask_destroy (&_context->arrays_enabled);
_cogl_bitmask_destroy (&_context->temp_bitmask);
_cogl_bitmask_destroy (&_context->arrays_to_change);
g_slist_free (_context->texture_types);
g_slist_free (_context->buffer_types);
#ifdef HAVE_COGL_GLES2
if (_context->flushed_modelview_stack)
cogl_object_unref (_context->flushed_modelview_stack);
if (_context->flushed_projection_stack)
cogl_object_unref (_context->flushed_projection_stack);
#endif
#ifdef HAVE_COGL_GL
g_hash_table_unref (_context->arbfp_cache);
#endif
g_byte_array_free (_context->buffer_map_fallback_array, TRUE);
g_free (_context);
}
CoglContext *
_cogl_context_get_default (void)
{
/* Create if doesn't exist yet */
if (_context == NULL)
cogl_create_context ();
return _context;
}
/**
* _cogl_set_indirect_context:
* @indirect: TRUE if GL context is indirect
*
* Advises COGL that the GL context is indirect (commands are sent
* over a socket). COGL uses this information to try to avoid
* round-trips in its use of GL, for example.
*
* This function cannot be called "on the fly," only before COGL
* initializes.
*/
void
_cogl_set_indirect_context (gboolean indirect)
{
/* we get called multiple times if someone creates
* more than the default stage
*/
if (_context != NULL)
{
if (indirect != _context->indirect)
g_warning ("Right now all stages will be treated as "
"either direct or indirect, ignoring attempt "
"to change to indirect=%d", indirect);
return;
}
gl_is_indirect = indirect;
}
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