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mutter/cogl/cogl-pipeline-layer.c
Robert Bragg a0441778ad This re-licenses Cogl 1.18 under the MIT license 
Since the Cogl 1.18 branch is actively maintained in parallel with the
master branch; this is a counter part to commit 1b83ef938fc16b which
re-licensed the master branch to use the MIT license.

This re-licensing is a follow up to the proposal that was sent to the
Cogl mailing list:
http://lists.freedesktop.org/archives/cogl/2013-December/001465.html

Note: there was a copyright assignment policy in place for Clutter (and
therefore Cogl which was part of Clutter at the time) until the 11th of
June 2010 and so we only checked the details after that point (commit
0bbf50f905)

For each file, authors were identified via this Git command:
$ git blame -p -C -C -C20 -M -M10  0bbf50f905..HEAD

We received blanket approvals for re-licensing all Red Hat and Collabora
contributions which reduced how many people needed to be contacted
individually:
- http://lists.freedesktop.org/archives/cogl/2013-December/001470.html
- http://lists.freedesktop.org/archives/cogl/2014-January/001536.html

Individual approval requests were sent to all the other identified authors
who all confirmed the re-license on the Cogl mailinglist:
http://lists.freedesktop.org/archives/cogl/2014-January

As well as updating the copyright header in all sources files, the
COPYING file has been updated to reflect the license change and also
document the other licenses used in Cogl such as the SGI Free Software
License B, version 2.0 and the 3-clause BSD license.

This patch was not simply cherry-picked from master; but the same
methodology was used to check the source files.
2014-02-22 02:02:53 +00:00

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/*
* Cogl
*
* A Low Level GPU Graphics and Utilities API
*
* Copyright (C) 2008,2009,2010 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*
*
* Authors:
* Robert Bragg <robert@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl-util.h"
#include "cogl-context-private.h"
#include "cogl-texture-private.h"
#include "cogl-pipeline.h"
#include "cogl-pipeline-layer-private.h"
#include "cogl-pipeline-layer-state-private.h"
#include "cogl-pipeline-layer-state.h"
#include "cogl-node-private.h"
#include "cogl-pipeline-opengl-private.h"
#include "cogl-context-private.h"
#include "cogl-texture-private.h"
#include <string.h>
static void
_cogl_pipeline_layer_free (CoglPipelineLayer *layer);
/* This type was made deprecated before the cogl_is_pipeline_layer
function was ever exposed in the public headers so there's no need
to make the cogl_is_pipeline_layer function public. We use INTERNAL
so that the cogl_is_* function won't get defined */
COGL_OBJECT_INTERNAL_DEFINE (PipelineLayer, pipeline_layer);
CoglPipelineLayer *
_cogl_pipeline_layer_get_authority (CoglPipelineLayer *layer,
unsigned long difference)
{
CoglPipelineLayer *authority = layer;
while (!(authority->differences & difference))
authority = _cogl_pipeline_layer_get_parent (authority);
return authority;
}
int
_cogl_pipeline_layer_get_unit_index (CoglPipelineLayer *layer)
{
CoglPipelineLayer *authority =
_cogl_pipeline_layer_get_authority (layer, COGL_PIPELINE_LAYER_STATE_UNIT);
return authority->unit_index;
}
CoglBool
_cogl_pipeline_layer_has_alpha (CoglPipelineLayer *layer)
{
CoglPipelineLayer *combine_authority =
_cogl_pipeline_layer_get_authority (layer,
COGL_PIPELINE_LAYER_STATE_COMBINE);
CoglPipelineLayerBigState *big_state = combine_authority->big_state;
CoglPipelineLayer *tex_authority;
CoglPipelineLayer *snippets_authority;
/* has_alpha maintains the alpha status for the GL_PREVIOUS layer */
/* For anything but the default texture combine we currently just
* assume it may result in an alpha value < 1
*
* FIXME: we could do better than this. */
if (big_state->texture_combine_alpha_func !=
COGL_PIPELINE_COMBINE_FUNC_MODULATE ||
big_state->texture_combine_alpha_src[0] !=
COGL_PIPELINE_COMBINE_SOURCE_PREVIOUS ||
big_state->texture_combine_alpha_op[0] !=
COGL_PIPELINE_COMBINE_OP_SRC_ALPHA ||
big_state->texture_combine_alpha_src[1] !=
COGL_PIPELINE_COMBINE_SOURCE_TEXTURE ||
big_state->texture_combine_alpha_op[1] !=
COGL_PIPELINE_COMBINE_OP_SRC_ALPHA)
{
return TRUE;
}
/* NB: A layer may have a combine mode set on it but not yet
* have an associated texture which would mean we'd fallback
* to the default texture which doesn't have an alpha component
*/
tex_authority =
_cogl_pipeline_layer_get_authority (layer,
COGL_PIPELINE_LAYER_STATE_TEXTURE_DATA);
if (tex_authority->texture &&
_cogl_texture_get_format (tex_authority->texture) & COGL_A_BIT)
{
return TRUE;
}
/* All bets are off if the layer contains any snippets */
snippets_authority = _cogl_pipeline_layer_get_authority
(layer, COGL_PIPELINE_LAYER_STATE_VERTEX_SNIPPETS);
if (snippets_authority->big_state->vertex_snippets.entries != NULL)
return TRUE;
snippets_authority = _cogl_pipeline_layer_get_authority
(layer, COGL_PIPELINE_LAYER_STATE_FRAGMENT_SNIPPETS);
if (snippets_authority->big_state->fragment_snippets.entries != NULL)
return TRUE;
return FALSE;
}
unsigned int
_cogl_get_n_args_for_combine_func (CoglPipelineCombineFunc func)
{
switch (func)
{
case COGL_PIPELINE_COMBINE_FUNC_REPLACE:
return 1;
case COGL_PIPELINE_COMBINE_FUNC_MODULATE:
case COGL_PIPELINE_COMBINE_FUNC_ADD:
case COGL_PIPELINE_COMBINE_FUNC_ADD_SIGNED:
case COGL_PIPELINE_COMBINE_FUNC_SUBTRACT:
case COGL_PIPELINE_COMBINE_FUNC_DOT3_RGB:
case COGL_PIPELINE_COMBINE_FUNC_DOT3_RGBA:
return 2;
case COGL_PIPELINE_COMBINE_FUNC_INTERPOLATE:
return 3;
}
return 0;
}
void
_cogl_pipeline_layer_copy_differences (CoglPipelineLayer *dest,
CoglPipelineLayer *src,
unsigned long differences)
{
CoglPipelineLayerBigState *big_dest, *big_src;
if ((differences & COGL_PIPELINE_LAYER_STATE_NEEDS_BIG_STATE) &&
!dest->has_big_state)
{
dest->big_state = g_slice_new (CoglPipelineLayerBigState);
dest->has_big_state = TRUE;
}
big_dest = dest->big_state;
big_src = src->big_state;
dest->differences |= differences;
while (differences)
{
int index = _cogl_util_ffs (differences) - 1;
differences &= ~(1 << index);
/* This convoluted switch statement is just here so that we'll
* get a warning if a new state is added without handling it
* here */
switch (index)
{
case COGL_PIPELINE_LAYER_STATE_COUNT:
case COGL_PIPELINE_LAYER_STATE_UNIT_INDEX:
g_warn_if_reached ();
break;
case COGL_PIPELINE_LAYER_STATE_TEXTURE_TYPE_INDEX:
dest->texture_type = src->texture_type;
break;
case COGL_PIPELINE_LAYER_STATE_TEXTURE_DATA_INDEX:
dest->texture = src->texture;
if (dest->texture)
cogl_object_ref (dest->texture);
break;
case COGL_PIPELINE_LAYER_STATE_SAMPLER_INDEX:
dest->sampler_cache_entry = src->sampler_cache_entry;
break;
case COGL_PIPELINE_LAYER_STATE_COMBINE_INDEX:
{
CoglPipelineCombineFunc func;
int n_args, i;
func = big_src->texture_combine_rgb_func;
big_dest->texture_combine_rgb_func = func;
n_args = _cogl_get_n_args_for_combine_func (func);
for (i = 0; i < n_args; i++)
{
big_dest->texture_combine_rgb_src[i] =
big_src->texture_combine_rgb_src[i];
big_dest->texture_combine_rgb_op[i] =
big_src->texture_combine_rgb_op[i];
}
func = big_src->texture_combine_alpha_func;
big_dest->texture_combine_alpha_func = func;
n_args = _cogl_get_n_args_for_combine_func (func);
for (i = 0; i < n_args; i++)
{
big_dest->texture_combine_alpha_src[i] =
big_src->texture_combine_alpha_src[i];
big_dest->texture_combine_alpha_op[i] =
big_src->texture_combine_alpha_op[i];
}
}
break;
case COGL_PIPELINE_LAYER_STATE_COMBINE_CONSTANT_INDEX:
memcpy (big_dest->texture_combine_constant,
big_src->texture_combine_constant,
sizeof (big_dest->texture_combine_constant));
break;
case COGL_PIPELINE_LAYER_STATE_POINT_SPRITE_COORDS_INDEX:
big_dest->point_sprite_coords = big_src->point_sprite_coords;
break;
case COGL_PIPELINE_LAYER_STATE_VERTEX_SNIPPETS_INDEX:
_cogl_pipeline_snippet_list_copy (&big_dest->vertex_snippets,
&big_src->vertex_snippets);
break;
case COGL_PIPELINE_LAYER_STATE_FRAGMENT_SNIPPETS_INDEX:
_cogl_pipeline_snippet_list_copy (&big_dest->fragment_snippets,
&big_src->fragment_snippets);
break;
}
}
}
static void
_cogl_pipeline_layer_init_multi_property_sparse_state (
CoglPipelineLayer *layer,
CoglPipelineLayerState change)
{
CoglPipelineLayer *authority;
/* Nothing to initialize in these cases since they are all comprised
* of one member which we expect to immediately be overwritten. */
if (!(change & COGL_PIPELINE_LAYER_STATE_MULTI_PROPERTY))
return;
authority = _cogl_pipeline_layer_get_authority (layer, change);
switch (change)
{
/* XXX: avoid using a default: label so we get a warning if we
* don't explicitly handle a newly defined state-group here. */
case COGL_PIPELINE_LAYER_STATE_UNIT:
case COGL_PIPELINE_LAYER_STATE_TEXTURE_TYPE:
case COGL_PIPELINE_LAYER_STATE_TEXTURE_DATA:
case COGL_PIPELINE_LAYER_STATE_POINT_SPRITE_COORDS:
case COGL_PIPELINE_LAYER_STATE_USER_MATRIX:
case COGL_PIPELINE_LAYER_STATE_COMBINE_CONSTANT:
case COGL_PIPELINE_LAYER_STATE_SAMPLER:
g_return_if_reached ();
/* XXX: technically we could probably even consider these as
* single property state-groups from the pov that currently the
* corresponding property setters always update all of the values
* at the same time. */
case COGL_PIPELINE_LAYER_STATE_COMBINE:
{
int n_args;
int i;
CoglPipelineLayerBigState *src_big_state = authority->big_state;
CoglPipelineLayerBigState *dest_big_state = layer->big_state;
GLint func = src_big_state->texture_combine_rgb_func;
dest_big_state->texture_combine_rgb_func = func;
n_args = _cogl_get_n_args_for_combine_func (func);
for (i = 0; i < n_args; i++)
{
dest_big_state->texture_combine_rgb_src[i] =
src_big_state->texture_combine_rgb_src[i];
dest_big_state->texture_combine_rgb_op[i] =
src_big_state->texture_combine_rgb_op[i];
}
func = src_big_state->texture_combine_alpha_func;
dest_big_state->texture_combine_alpha_func = func;
n_args = _cogl_get_n_args_for_combine_func (func);
for (i = 0; i < n_args; i++)
{
dest_big_state->texture_combine_alpha_src[i] =
src_big_state->texture_combine_alpha_src[i];
dest_big_state->texture_combine_alpha_op[i] =
src_big_state->texture_combine_alpha_op[i];
}
break;
}
case COGL_PIPELINE_LAYER_STATE_VERTEX_SNIPPETS:
_cogl_pipeline_snippet_list_copy (&layer->big_state->vertex_snippets,
&authority->big_state->
vertex_snippets);
break;
case COGL_PIPELINE_LAYER_STATE_FRAGMENT_SNIPPETS:
_cogl_pipeline_snippet_list_copy (&layer->big_state->fragment_snippets,
&authority->big_state->
fragment_snippets);
break;
}
}
/* NB: If a layer has descendants we can't modify the layer
* NB: If the layer is owned and the owner has descendants we can't
* modify the layer.
*
* This function will allocate a new derived layer if you are trying
* to change the state of a layer with dependants (as described above)
* so you must always check the return value.
*
* If a new layer is returned it will be owned by required_owner.
* (NB: a layer is always modified with respect to a pipeline - the
* "required_owner")
*
* required_owner can only by NULL for new, currently unowned layers
* with no dependants.
*/
CoglPipelineLayer *
_cogl_pipeline_layer_pre_change_notify (CoglPipeline *required_owner,
CoglPipelineLayer *layer,
CoglPipelineLayerState change)
{
CoglTextureUnit *unit;
/* Identify the case where the layer is new with no owner or
* dependants and so we don't need to do anything. */
if (_cogl_list_empty (&COGL_NODE (layer)->children) &&
layer->owner == NULL)
goto init_layer_state;
/* We only allow a NULL required_owner for new layers */
_COGL_RETURN_VAL_IF_FAIL (required_owner != NULL, layer);
/* Chain up:
* A modification of a layer is indirectly also a modification of
* its owner so first make sure to flush the journal of any
* references to the current owner state and if necessary perform
* a copy-on-write for the required_owner if it has dependants.
*/
_cogl_pipeline_pre_change_notify (required_owner,
COGL_PIPELINE_STATE_LAYERS,
NULL,
TRUE);
/* Unlike pipelines; layers are simply considered immutable once
* they have dependants - either direct children, or another
* pipeline as an owner.
*/
if (!_cogl_list_empty (&COGL_NODE (layer)->children) ||
layer->owner != required_owner)
{
CoglPipelineLayer *new = _cogl_pipeline_layer_copy (layer);
if (layer->owner == required_owner)
_cogl_pipeline_remove_layer_difference (required_owner, layer, FALSE);
_cogl_pipeline_add_layer_difference (required_owner, new, FALSE);
cogl_object_unref (new);
layer = new;
goto init_layer_state;
}
/* Note: At this point we know there is only one pipeline dependant on
* this layer (required_owner), and there are no other layers
* dependant on this layer so it's ok to modify it. */
/* NB: Although layers can have private state associated with them
* by multiple backends we know that a layer can't be *changed* if
* it has multiple dependants so if we reach here we know we only
* have a single owner and can only be associated with a single
* backend that needs to be notified of the layer change...
*/
if (required_owner->progend != COGL_PIPELINE_PROGEND_UNDEFINED)
{
const CoglPipelineProgend *progend =
_cogl_pipeline_progends[required_owner->progend];
const CoglPipelineFragend *fragend =
_cogl_pipeline_fragends[progend->fragend];
const CoglPipelineVertend *vertend =
_cogl_pipeline_vertends[progend->vertend];
if (fragend->layer_pre_change_notify)
fragend->layer_pre_change_notify (required_owner, layer, change);
if (vertend->layer_pre_change_notify)
vertend->layer_pre_change_notify (required_owner, layer, change);
if (progend->layer_pre_change_notify)
progend->layer_pre_change_notify (required_owner, layer, change);
}
/* If the layer being changed is the same as the last layer we
* flushed to the corresponding texture unit then we keep a track of
* the changes so we can try to minimize redundant OpenGL calls if
* the same layer is flushed again.
*/
unit = _cogl_get_texture_unit (_cogl_pipeline_layer_get_unit_index (layer));
if (unit->layer == layer)
unit->layer_changes_since_flush |= change;
init_layer_state:
if (required_owner)
required_owner->age++;
if (change & COGL_PIPELINE_LAYER_STATE_NEEDS_BIG_STATE &&
!layer->has_big_state)
{
layer->big_state = g_slice_new (CoglPipelineLayerBigState);
layer->has_big_state = TRUE;
}
/* Note: conceptually we have just been notified that a single
* property value is about to change, but since some state-groups
* contain multiple properties and 'layer' is about to take over
* being the authority for the property's corresponding state-group
* we need to maintain the integrity of the other property values
* too.
*
* To ensure this we handle multi-property state-groups by copying
* all the values from the old-authority to the new...
*
* We don't have to worry about non-sparse property groups since
* we never take over being an authority for such properties so
* they automatically maintain integrity.
*/
if (change & COGL_PIPELINE_LAYER_STATE_ALL_SPARSE &&
!(layer->differences & change))
{
_cogl_pipeline_layer_init_multi_property_sparse_state (layer, change);
layer->differences |= change;
}
return layer;
}
static void
_cogl_pipeline_layer_unparent (CoglNode *layer)
{
/* Chain up */
_cogl_pipeline_node_unparent_real (layer);
}
static void
_cogl_pipeline_layer_set_parent (CoglPipelineLayer *layer,
CoglPipelineLayer *parent)
{
/* Chain up */
_cogl_pipeline_node_set_parent_real (COGL_NODE (layer),
COGL_NODE (parent),
_cogl_pipeline_layer_unparent,
TRUE);
}
CoglPipelineLayer *
_cogl_pipeline_layer_copy (CoglPipelineLayer *src)
{
CoglPipelineLayer *layer = g_slice_new (CoglPipelineLayer);
_cogl_pipeline_node_init (COGL_NODE (layer));
layer->owner = NULL;
layer->index = src->index;
layer->differences = 0;
layer->has_big_state = FALSE;
_cogl_pipeline_layer_set_parent (layer, src);
return _cogl_pipeline_layer_object_new (layer);
}
/* XXX: This is duplicated logic; the same as for
* _cogl_pipeline_prune_redundant_ancestry it would be nice to find a
* way to consolidate these functions! */
void
_cogl_pipeline_layer_prune_redundant_ancestry (CoglPipelineLayer *layer)
{
CoglPipelineLayer *new_parent = _cogl_pipeline_layer_get_parent (layer);
/* walk up past ancestors that are now redundant and potentially
* reparent the layer. */
while (_cogl_pipeline_layer_get_parent (new_parent) &&
(new_parent->differences | layer->differences) ==
layer->differences)
new_parent = _cogl_pipeline_layer_get_parent (new_parent);
_cogl_pipeline_layer_set_parent (layer, new_parent);
}
/* Determine the mask of differences between two layers.
*
* XXX: If layers and pipelines could both be cast to a common Tree
* type of some kind then we could have a unified
* compare_differences() function.
*/
unsigned long
_cogl_pipeline_layer_compare_differences (CoglPipelineLayer *layer0,
CoglPipelineLayer *layer1)
{
GSList *head0 = NULL;
GSList *head1 = NULL;
CoglPipelineLayer *node0;
CoglPipelineLayer *node1;
int len0 = 0;
int len1 = 0;
int count;
GSList *common_ancestor0;
GSList *common_ancestor1;
unsigned long layers_difference = 0;
/* Algorithm:
*
* 1) Walk the ancestors of each layer to the root node, adding a
* pointer to each ancester node to two linked lists
*
* 2) Compare the lists to find the nodes where they start to
* differ marking the common_ancestor node for each list.
*
* 3) For each list now iterate starting after the common_ancestor
* nodes ORing each nodes ->difference mask into the final
* differences mask.
*/
for (node0 = layer0; node0; node0 = _cogl_pipeline_layer_get_parent (node0))
{
GSList *link = alloca (sizeof (GSList));
link->next = head0;
link->data = node0;
head0 = link;
len0++;
}
for (node1 = layer1; node1; node1 = _cogl_pipeline_layer_get_parent (node1))
{
GSList *link = alloca (sizeof (GSList));
link->next = head1;
link->data = node1;
head1 = link;
len1++;
}
/* NB: There's no point looking at the head entries since we know both layers
* must have the same default layer as their root node. */
common_ancestor0 = head0;
common_ancestor1 = head1;
head0 = head0->next;
head1 = head1->next;
count = MIN (len0, len1) - 1;
while (count--)
{
if (head0->data != head1->data)
break;
common_ancestor0 = head0;
common_ancestor1 = head1;
head0 = head0->next;
head1 = head1->next;
}
for (head0 = common_ancestor0->next; head0; head0 = head0->next)
{
node0 = head0->data;
layers_difference |= node0->differences;
}
for (head1 = common_ancestor1->next; head1; head1 = head1->next)
{
node1 = head1->data;
layers_difference |= node1->differences;
}
return layers_difference;
}
static CoglBool
layer_state_equal (CoglPipelineLayerStateIndex state_index,
CoglPipelineLayer **authorities0,
CoglPipelineLayer **authorities1,
CoglPipelineLayerStateComparitor comparitor)
{
return comparitor (authorities0[state_index], authorities1[state_index]);
}
void
_cogl_pipeline_layer_resolve_authorities (CoglPipelineLayer *layer,
unsigned long differences,
CoglPipelineLayer **authorities)
{
unsigned long remaining = differences;
CoglPipelineLayer *authority = layer;
do
{
unsigned long found = authority->differences & remaining;
int i;
if (found == 0)
continue;
for (i = 0; TRUE; i++)
{
unsigned long state = (1L<<i);
if (state & found)
authorities[i] = authority;
else if (state > found)
break;
}
remaining &= ~found;
if (remaining == 0)
return;
}
while ((authority = _cogl_pipeline_layer_get_parent (authority)));
g_assert (remaining == 0);
}
CoglBool
_cogl_pipeline_layer_equal (CoglPipelineLayer *layer0,
CoglPipelineLayer *layer1,
unsigned long differences_mask,
CoglPipelineEvalFlags flags)
{
unsigned long layers_difference;
CoglPipelineLayer *authorities0[COGL_PIPELINE_LAYER_STATE_SPARSE_COUNT];
CoglPipelineLayer *authorities1[COGL_PIPELINE_LAYER_STATE_SPARSE_COUNT];
if (layer0 == layer1)
return TRUE;
layers_difference =
_cogl_pipeline_layer_compare_differences (layer0, layer1);
/* Only compare the sparse state groups requested by the caller... */
layers_difference &= differences_mask;
_cogl_pipeline_layer_resolve_authorities (layer0,
layers_difference,
authorities0);
_cogl_pipeline_layer_resolve_authorities (layer1,
layers_difference,
authorities1);
if (layers_difference & COGL_PIPELINE_LAYER_STATE_TEXTURE_TYPE)
{
CoglPipelineLayerStateIndex state_index =
COGL_PIPELINE_LAYER_STATE_TEXTURE_TYPE_INDEX;
if (!_cogl_pipeline_layer_texture_type_equal (authorities0[state_index],
authorities1[state_index],
flags))
return FALSE;
}
if (layers_difference & COGL_PIPELINE_LAYER_STATE_TEXTURE_DATA)
{
CoglPipelineLayerStateIndex state_index =
COGL_PIPELINE_LAYER_STATE_TEXTURE_DATA_INDEX;
if (!_cogl_pipeline_layer_texture_data_equal (authorities0[state_index],
authorities1[state_index],
flags))
return FALSE;
}
if (layers_difference & COGL_PIPELINE_LAYER_STATE_COMBINE &&
!layer_state_equal (COGL_PIPELINE_LAYER_STATE_COMBINE_INDEX,
authorities0, authorities1,
_cogl_pipeline_layer_combine_state_equal))
return FALSE;
if (layers_difference & COGL_PIPELINE_LAYER_STATE_COMBINE_CONSTANT &&
!layer_state_equal (COGL_PIPELINE_LAYER_STATE_COMBINE_CONSTANT_INDEX,
authorities0, authorities1,
_cogl_pipeline_layer_combine_constant_equal))
return FALSE;
if (layers_difference & COGL_PIPELINE_LAYER_STATE_SAMPLER &&
!layer_state_equal (COGL_PIPELINE_LAYER_STATE_SAMPLER_INDEX,
authorities0, authorities1,
_cogl_pipeline_layer_sampler_equal))
return FALSE;
if (layers_difference & COGL_PIPELINE_LAYER_STATE_USER_MATRIX &&
!layer_state_equal (COGL_PIPELINE_LAYER_STATE_USER_MATRIX_INDEX,
authorities0, authorities1,
_cogl_pipeline_layer_user_matrix_equal))
return FALSE;
if (layers_difference & COGL_PIPELINE_LAYER_STATE_POINT_SPRITE_COORDS &&
!layer_state_equal (COGL_PIPELINE_LAYER_STATE_POINT_SPRITE_COORDS_INDEX,
authorities0, authorities1,
_cogl_pipeline_layer_point_sprite_coords_equal))
return FALSE;
if (layers_difference & COGL_PIPELINE_LAYER_STATE_VERTEX_SNIPPETS &&
!layer_state_equal (COGL_PIPELINE_LAYER_STATE_VERTEX_SNIPPETS_INDEX,
authorities0, authorities1,
_cogl_pipeline_layer_vertex_snippets_equal))
return FALSE;
if (layers_difference & COGL_PIPELINE_LAYER_STATE_FRAGMENT_SNIPPETS &&
!layer_state_equal (COGL_PIPELINE_LAYER_STATE_FRAGMENT_SNIPPETS_INDEX,
authorities0, authorities1,
_cogl_pipeline_layer_fragment_snippets_equal))
return FALSE;
return TRUE;
}
static void
_cogl_pipeline_layer_free (CoglPipelineLayer *layer)
{
_cogl_pipeline_layer_unparent (COGL_NODE (layer));
if (layer->differences & COGL_PIPELINE_LAYER_STATE_TEXTURE_DATA &&
layer->texture != NULL)
cogl_object_unref (layer->texture);
if (layer->differences & COGL_PIPELINE_LAYER_STATE_VERTEX_SNIPPETS)
_cogl_pipeline_snippet_list_free (&layer->big_state->vertex_snippets);
if (layer->differences & COGL_PIPELINE_LAYER_STATE_FRAGMENT_SNIPPETS)
_cogl_pipeline_snippet_list_free (&layer->big_state->fragment_snippets);
if (layer->differences & COGL_PIPELINE_LAYER_STATE_NEEDS_BIG_STATE)
g_slice_free (CoglPipelineLayerBigState, layer->big_state);
g_slice_free (CoglPipelineLayer, layer);
}
void
_cogl_pipeline_init_default_layers (void)
{
CoglPipelineLayer *layer = g_slice_new0 (CoglPipelineLayer);
CoglPipelineLayerBigState *big_state =
g_slice_new0 (CoglPipelineLayerBigState);
CoglPipelineLayer *new;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
_cogl_pipeline_node_init (COGL_NODE (layer));
layer->index = 0;
layer->differences = COGL_PIPELINE_LAYER_STATE_ALL_SPARSE;
layer->unit_index = 0;
layer->texture = NULL;
layer->texture_type = COGL_TEXTURE_TYPE_2D;
layer->sampler_cache_entry =
_cogl_sampler_cache_get_default_entry (ctx->sampler_cache);
layer->big_state = big_state;
layer->has_big_state = TRUE;
/* Choose the same default combine mode as OpenGL:
* RGBA = MODULATE(PREVIOUS[RGBA],TEXTURE[RGBA]) */
big_state->texture_combine_rgb_func =
COGL_PIPELINE_COMBINE_FUNC_MODULATE;
big_state->texture_combine_rgb_src[0] =
COGL_PIPELINE_COMBINE_SOURCE_PREVIOUS;
big_state->texture_combine_rgb_src[1] =
COGL_PIPELINE_COMBINE_SOURCE_TEXTURE;
big_state->texture_combine_rgb_op[0] =
COGL_PIPELINE_COMBINE_OP_SRC_COLOR;
big_state->texture_combine_rgb_op[1] =
COGL_PIPELINE_COMBINE_OP_SRC_COLOR;
big_state->texture_combine_alpha_func =
COGL_PIPELINE_COMBINE_FUNC_MODULATE;
big_state->texture_combine_alpha_src[0] =
COGL_PIPELINE_COMBINE_SOURCE_PREVIOUS;
big_state->texture_combine_alpha_src[1] =
COGL_PIPELINE_COMBINE_SOURCE_TEXTURE;
big_state->texture_combine_alpha_op[0] =
COGL_PIPELINE_COMBINE_OP_SRC_ALPHA;
big_state->texture_combine_alpha_op[1] =
COGL_PIPELINE_COMBINE_OP_SRC_ALPHA;
big_state->point_sprite_coords = FALSE;
cogl_matrix_init_identity (&big_state->matrix);
ctx->default_layer_0 = _cogl_pipeline_layer_object_new (layer);
/* TODO: we should make default_layer_n comprise of two
* descendants of default_layer_0:
* - the first descendant should change the texture combine
* to what we expect is most commonly used for multitexturing
* - the second should revert the above change.
*
* why? the documentation for how a new layer is initialized
* doesn't say that layers > 0 have different defaults so unless
* we change the documentation we can't use different defaults,
* but if the user does what we expect and changes the
* texture combine then we can revert the authority to the
* first descendant which means we can maximize the number
* of layers with a common ancestor.
*
* The main problem will be that we'll need to disable the
* optimizations for flattening the ancestry when we make
* the second descendant which reverts the state.
*/
ctx->default_layer_n = _cogl_pipeline_layer_copy (layer);
new = _cogl_pipeline_set_layer_unit (NULL, ctx->default_layer_n, 1);
g_assert (new == ctx->default_layer_n);
/* Since we passed a newly allocated layer we don't expect that
* _set_layer_unit() will have to allocate *another* layer. */
/* Finally we create a dummy dependant for ->default_layer_n which
* effectively ensures that ->default_layer_n and ->default_layer_0
* remain immutable.
*/
ctx->dummy_layer_dependant =
_cogl_pipeline_layer_copy (ctx->default_layer_n);
}
void
_cogl_pipeline_layer_pre_paint (CoglPipelineLayer *layer)
{
CoglPipelineLayer *texture_authority;
texture_authority =
_cogl_pipeline_layer_get_authority (layer,
COGL_PIPELINE_LAYER_STATE_TEXTURE_DATA);
if (texture_authority->texture != NULL)
{
CoglTexturePrePaintFlags flags = 0;
CoglPipelineFilter min_filter;
CoglPipelineFilter mag_filter;
_cogl_pipeline_layer_get_filters (layer, &min_filter, &mag_filter);
if (min_filter == COGL_PIPELINE_FILTER_NEAREST_MIPMAP_NEAREST
|| min_filter == COGL_PIPELINE_FILTER_LINEAR_MIPMAP_NEAREST
|| min_filter == COGL_PIPELINE_FILTER_NEAREST_MIPMAP_LINEAR
|| min_filter == COGL_PIPELINE_FILTER_LINEAR_MIPMAP_LINEAR)
flags |= COGL_TEXTURE_NEEDS_MIPMAP;
_cogl_texture_pre_paint (texture_authority->texture, flags);
}
}
/* Determines if we need to handle the RGB and A texture combining
* separately or is the same function used for both channel masks and
* with the same arguments...
*/
CoglBool
_cogl_pipeline_layer_needs_combine_separate
(CoglPipelineLayer *combine_authority)
{
CoglPipelineLayerBigState *big_state = combine_authority->big_state;
int n_args;
int i;
if (big_state->texture_combine_rgb_func !=
big_state->texture_combine_alpha_func)
return TRUE;
n_args = _cogl_get_n_args_for_combine_func (big_state->texture_combine_rgb_func);
for (i = 0; i < n_args; i++)
{
if (big_state->texture_combine_rgb_src[i] !=
big_state->texture_combine_alpha_src[i])
return TRUE;
/*
* We can allow some variation of the source operands without
* needing a separation...
*
* "A = REPLACE (CONSTANT[A])" + either of the following...
* "RGB = REPLACE (CONSTANT[RGB])"
* "RGB = REPLACE (CONSTANT[A])"
*
* can be combined as:
* "RGBA = REPLACE (CONSTANT)" or
* "RGBA = REPLACE (CONSTANT[A])" or
*
* And "A = REPLACE (1-CONSTANT[A])" + either of the following...
* "RGB = REPLACE (1-CONSTANT)" or
* "RGB = REPLACE (1-CONSTANT[A])"
*
* can be combined as:
* "RGBA = REPLACE (1-CONSTANT)" or
* "RGBA = REPLACE (1-CONSTANT[A])"
*/
switch (big_state->texture_combine_alpha_op[i])
{
case GL_SRC_ALPHA:
switch (big_state->texture_combine_rgb_op[i])
{
case GL_SRC_COLOR:
case GL_SRC_ALPHA:
break;
default:
return FALSE;
}
break;
case GL_ONE_MINUS_SRC_ALPHA:
switch (big_state->texture_combine_rgb_op[i])
{
case GL_ONE_MINUS_SRC_COLOR:
case GL_ONE_MINUS_SRC_ALPHA:
break;
default:
return FALSE;
}
break;
default:
return FALSE; /* impossible */
}
}
return FALSE;
}
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