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mutter/cogl/cogl-pipeline-layer-private.h
Neil Roberts c33ce5fc6b Use GL_ARB_sampler_objects 
GL_ARB_sampler_objects provides a GL object which overrides the
sampler state part of a texture object with different values. The
sampler state that Cogl currently exposes is the wrap modes and
filters. Cogl exposes the state as part of the pipeline layer state
but without this extension GL only exposes it as part of the texture
object state. This means that it won't work to use a single texture
multiple times in one primitive with different sampler states. It also
makes switching between different sampler states with a single texture
not terribly efficient because it has to change the texture object
state every time.

This patch adds a cache for sampler states in a shared hash table
attached to the CoglContext. The entire set of parameters for the
sampler state is used as the key for the hash table. When a unique
state is encountered the sampler cache will create a new entry,
otherwise it will return a const pointer to an existing entry. That
means we can have a single pointer to represent any combination of
sampler state.

Pipeline layers now just store this single pointer rather than storing
all of the sampler state. The two separate state flags for wrap modes
and filters have now been combined into one. It should be faster to
compare the sampler state now because instead of comparing each value
it can just compare the pointers to the cached sampler entries. The
hash table of cached sampler states should only need to perform its
more expensive hash on the state when a property is changed on a
pipeline, not every time it is flushed.

When the sampler objects extension is available each cached sampler
state will also get a sampler object to represent it. The common code
to flush the GL state will now simply bind this object to a unit
instead of flushing the state though the CoglTexture when possible.

Reviewed-by: Robert Bragg <robert@linux.intel.com>
2012-04-05 13:47:36 +01:00

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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2008,2009,2010,2011 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, see
* <http://www.gnu.org/licenses/>.
*
*
*
* Authors:
* Robert Bragg <robert@linux.intel.com>
*/
#ifndef __COGL_PIPELINE_LAYER_PRIVATE_H
#define __COGL_PIPELINE_LAYER_PRIVATE_H
#include "cogl-pipeline.h"
#include "cogl-node-private.h"
#include "cogl-texture.h"
#include "cogl-matrix.h"
#include "cogl-pipeline-layer-state.h"
#include "cogl-internal.h"
#include "cogl-pipeline-snippet-private.h"
#include "cogl-sampler-cache-private.h"
#include <glib.h>
/* This isn't defined in the GLES headers */
#ifndef GL_CLAMP_TO_BORDER
#define GL_CLAMP_TO_BORDER 0x812d
#endif
#ifndef GL_MIRRORED_REPEAT
#define GL_MIRRORED_REPEAT 0x8370
#endif
typedef struct _CoglPipelineLayer CoglPipelineLayer;
#define COGL_PIPELINE_LAYER(OBJECT) ((CoglPipelineLayer *)OBJECT)
/* XXX: should I rename these as
* COGL_PIPELINE_LAYER_STATE_INDEX_XYZ... ?
*/
typedef enum
{
/* sparse state */
COGL_PIPELINE_LAYER_STATE_UNIT_INDEX,
COGL_PIPELINE_LAYER_STATE_TEXTURE_TYPE_INDEX,
COGL_PIPELINE_LAYER_STATE_TEXTURE_DATA_INDEX,
COGL_PIPELINE_LAYER_STATE_SAMPLER_INDEX,
COGL_PIPELINE_LAYER_STATE_COMBINE_INDEX,
COGL_PIPELINE_LAYER_STATE_COMBINE_CONSTANT_INDEX,
COGL_PIPELINE_LAYER_STATE_USER_MATRIX_INDEX,
COGL_PIPELINE_LAYER_STATE_POINT_SPRITE_COORDS_INDEX,
COGL_PIPELINE_LAYER_STATE_VERTEX_SNIPPETS_INDEX,
COGL_PIPELINE_LAYER_STATE_FRAGMENT_SNIPPETS_INDEX,
/* note: layers don't currently have any non-sparse state */
COGL_PIPELINE_LAYER_STATE_SPARSE_COUNT,
COGL_PIPELINE_LAYER_STATE_COUNT = COGL_PIPELINE_LAYER_STATE_SPARSE_COUNT
} CoglPipelineLayerStateIndex;
/* XXX: If you add or remove state groups here you may need to update
* some of the state masks following this enum too!
*
* FIXME: perhaps it would be better to rename this enum to
* CoglPipelineLayerStateGroup to better convey the fact that a single
* enum here can map to multiple properties.
*/
typedef enum
{
COGL_PIPELINE_LAYER_STATE_UNIT =
1L<<COGL_PIPELINE_LAYER_STATE_UNIT_INDEX,
COGL_PIPELINE_LAYER_STATE_TEXTURE_TYPE =
1L<<COGL_PIPELINE_LAYER_STATE_TEXTURE_TYPE_INDEX,
COGL_PIPELINE_LAYER_STATE_TEXTURE_DATA =
1L<<COGL_PIPELINE_LAYER_STATE_TEXTURE_DATA_INDEX,
COGL_PIPELINE_LAYER_STATE_SAMPLER =
1L<<COGL_PIPELINE_LAYER_STATE_SAMPLER_INDEX,
COGL_PIPELINE_LAYER_STATE_COMBINE =
1L<<COGL_PIPELINE_LAYER_STATE_COMBINE_INDEX,
COGL_PIPELINE_LAYER_STATE_COMBINE_CONSTANT =
1L<<COGL_PIPELINE_LAYER_STATE_COMBINE_CONSTANT_INDEX,
COGL_PIPELINE_LAYER_STATE_USER_MATRIX =
1L<<COGL_PIPELINE_LAYER_STATE_USER_MATRIX_INDEX,
COGL_PIPELINE_LAYER_STATE_POINT_SPRITE_COORDS =
1L<<COGL_PIPELINE_LAYER_STATE_POINT_SPRITE_COORDS_INDEX,
COGL_PIPELINE_LAYER_STATE_VERTEX_SNIPPETS =
1L<<COGL_PIPELINE_LAYER_STATE_VERTEX_SNIPPETS_INDEX,
COGL_PIPELINE_LAYER_STATE_FRAGMENT_SNIPPETS =
1L<<COGL_PIPELINE_LAYER_STATE_FRAGMENT_SNIPPETS_INDEX,
/* COGL_PIPELINE_LAYER_STATE_TEXTURE_INTERN = 1L<<8, */
} CoglPipelineLayerState;
/*
* Various special masks that tag state-groups in different ways...
*/
#define COGL_PIPELINE_LAYER_STATE_ALL \
((1L<<COGL_PIPELINE_LAYER_STATE_COUNT) - 1)
#define COGL_PIPELINE_LAYER_STATE_ALL_SPARSE \
COGL_PIPELINE_LAYER_STATE_ALL
#define COGL_PIPELINE_LAYER_STATE_NEEDS_BIG_STATE \
(COGL_PIPELINE_LAYER_STATE_COMBINE | \
COGL_PIPELINE_LAYER_STATE_COMBINE_CONSTANT | \
COGL_PIPELINE_LAYER_STATE_USER_MATRIX | \
COGL_PIPELINE_LAYER_STATE_POINT_SPRITE_COORDS | \
COGL_PIPELINE_LAYER_STATE_VERTEX_SNIPPETS | \
COGL_PIPELINE_LAYER_STATE_FRAGMENT_SNIPPETS)
#define COGL_PIPELINE_LAYER_STATE_MULTI_PROPERTY \
(COGL_PIPELINE_LAYER_STATE_COMBINE | \
COGL_PIPELINE_LAYER_STATE_VERTEX_SNIPPETS | \
COGL_PIPELINE_LAYER_STATE_FRAGMENT_SNIPPETS)
#define COGL_PIPELINE_LAYER_STATE_AFFECTS_VERTEX_CODEGEN \
COGL_PIPELINE_LAYER_STATE_VERTEX_SNIPPETS
typedef enum
{
/* These are the same values as GL */
COGL_PIPELINE_COMBINE_FUNC_ADD = 0x0104,
COGL_PIPELINE_COMBINE_FUNC_ADD_SIGNED = 0x8574,
COGL_PIPELINE_COMBINE_FUNC_SUBTRACT = 0x84E7,
COGL_PIPELINE_COMBINE_FUNC_INTERPOLATE = 0x8575,
COGL_PIPELINE_COMBINE_FUNC_REPLACE = 0x1E01,
COGL_PIPELINE_COMBINE_FUNC_MODULATE = 0x2100,
COGL_PIPELINE_COMBINE_FUNC_DOT3_RGB = 0x86AE,
COGL_PIPELINE_COMBINE_FUNC_DOT3_RGBA = 0x86AF
} CoglPipelineCombineFunc;
typedef enum
{
/* Note that these numbers are deliberately not the same as the GL
numbers so that we can reserve all numbers > TEXTURE0 to store
very large layer numbers */
COGL_PIPELINE_COMBINE_SOURCE_TEXTURE,
COGL_PIPELINE_COMBINE_SOURCE_CONSTANT,
COGL_PIPELINE_COMBINE_SOURCE_PRIMARY_COLOR,
COGL_PIPELINE_COMBINE_SOURCE_PREVIOUS,
COGL_PIPELINE_COMBINE_SOURCE_TEXTURE0
} CoglPipelineCombineSource;
typedef enum
{
/* These are the same values as GL */
COGL_PIPELINE_COMBINE_OP_SRC_COLOR = 0x0300,
COGL_PIPELINE_COMBINE_OP_ONE_MINUS_SRC_COLOR = 0x0301,
COGL_PIPELINE_COMBINE_OP_SRC_ALPHA = 0x0302,
COGL_PIPELINE_COMBINE_OP_ONE_MINUS_SRC_ALPHA = 0x0303
} CoglPipelineCombineOp;
typedef struct
{
/* The texture combine state determines how the color of individual
* texture fragments are calculated. */
CoglPipelineCombineFunc texture_combine_rgb_func;
CoglPipelineCombineSource texture_combine_rgb_src[3];
CoglPipelineCombineOp texture_combine_rgb_op[3];
CoglPipelineCombineFunc texture_combine_alpha_func;
CoglPipelineCombineSource texture_combine_alpha_src[3];
CoglPipelineCombineOp texture_combine_alpha_op[3];
float texture_combine_constant[4];
/* The texture matrix dscribes how to transform texture coordinates */
CoglMatrix matrix;
gboolean point_sprite_coords;
CoglPipelineSnippetList vertex_snippets;
CoglPipelineSnippetList fragment_snippets;
} CoglPipelineLayerBigState;
struct _CoglPipelineLayer
{
/* XXX: Please think twice about adding members that *have* be
* initialized during a _cogl_pipeline_layer_copy. We are aiming
* to have copies be as cheap as possible and copies may be
* done by the primitives APIs which means they may happen
* in performance critical code paths.
*
* XXX: If you are extending the state we track please consider if
* the state is expected to vary frequently across many pipelines or
* if the state can be shared among many derived pipelines instead.
* This will determine if the state should be added directly to this
* structure which will increase the memory overhead for *all*
* layers or if instead it can go under ->big_state.
*/
/* Layers represent their state in a tree structure where some of
* the state relating to a given pipeline or layer may actually be
* owned by one if is ancestors in the tree. We have a common data
* type to track the tree heirachy so we can share code... */
CoglNode _parent;
/* Some layers have a pipeline owner, which is to say that the layer
* is referenced in that pipelines->layer_differences list. A layer
* doesn't always have an owner and may simply be an ancestor for
* other layers that keeps track of some shared state. */
CoglPipeline *owner;
/* The lowest index is blended first then others on top */
int index;
/* A mask of which state groups are different in this layer
* in comparison to its parent. */
unsigned long differences;
/* Common differences
*
* As a basic way to reduce memory usage we divide the layer
* state into two groups; the minimal state modified in 90% of
* all layers and the rest, so that the second group can
* be allocated dynamically when required.
*/
/* Each layer is directly associated with a single texture unit */
int unit_index;
/* The texture for this layer, or NULL for an empty
* layer */
CoglTexture *texture;
/* The type of the texture. This is always set even if the texture
is NULL and it will be used to determine what type of texture
lookups to use in any shaders generated by the pipeline
backends. */
CoglTextureType texture_type;
const CoglSamplerCacheEntry *sampler_cache_entry;
/* Infrequent differences aren't currently tracked in
* a separate, dynamically allocated structure as they are
* for pipelines... */
CoglPipelineLayerBigState *big_state;
/* bitfields */
/* Determines if layer->big_state is valid */
unsigned int has_big_state:1;
};
typedef gboolean
(*CoglPipelineLayerStateComparitor) (CoglPipelineLayer *authority0,
CoglPipelineLayer *authority1);
void
_cogl_pipeline_init_default_layers (void);
static inline CoglPipelineLayer *
_cogl_pipeline_layer_get_parent (CoglPipelineLayer *layer)
{
CoglNode *parent_node = COGL_NODE (layer)->parent;
return COGL_PIPELINE_LAYER (parent_node);
}
CoglPipelineLayer *
_cogl_pipeline_layer_copy (CoglPipelineLayer *layer);
void
_cogl_pipeline_layer_resolve_authorities (CoglPipelineLayer *layer,
unsigned long differences,
CoglPipelineLayer **authorities);
gboolean
_cogl_pipeline_layer_equal (CoglPipelineLayer *layer0,
CoglPipelineLayer *layer1,
unsigned long differences_mask,
CoglPipelineEvalFlags flags);
CoglPipelineLayer *
_cogl_pipeline_layer_pre_change_notify (CoglPipeline *required_owner,
CoglPipelineLayer *layer,
CoglPipelineLayerState change);
void
_cogl_pipeline_layer_prune_redundant_ancestry (CoglPipelineLayer *layer);
gboolean
_cogl_pipeline_layer_has_alpha (CoglPipelineLayer *layer);
gboolean
_cogl_pipeline_layer_has_user_matrix (CoglPipeline *pipeline,
int layer_index);
/*
* Calls the pre_paint method on the layer texture if there is
* one. This will determine whether mipmaps are needed based on the
* filter settings.
*/
void
_cogl_pipeline_layer_pre_paint (CoglPipelineLayer *layerr);
void
_cogl_pipeline_layer_get_wrap_modes (CoglPipelineLayer *layer,
CoglSamplerCacheWrapMode *wrap_mode_s,
CoglSamplerCacheWrapMode *wrap_mode_t,
CoglSamplerCacheWrapMode *wrap_mode_r);
void
_cogl_pipeline_layer_get_filters (CoglPipelineLayer *layer,
CoglPipelineFilter *min_filter,
CoglPipelineFilter *mag_filter);
const CoglSamplerCacheEntry *
_cogl_pipeline_layer_get_sampler_state (CoglPipelineLayer *layer);
void
_cogl_pipeline_get_layer_filters (CoglPipeline *pipeline,
int layer_index,
CoglPipelineFilter *min_filter,
CoglPipelineFilter *mag_filter);
typedef enum {
COGL_PIPELINE_LAYER_TYPE_TEXTURE
} CoglPipelineLayerType;
CoglPipelineLayerType
_cogl_pipeline_layer_get_type (CoglPipelineLayer *layer);
CoglTexture *
_cogl_pipeline_layer_get_texture (CoglPipelineLayer *layer);
CoglTexture *
_cogl_pipeline_layer_get_texture_real (CoglPipelineLayer *layer);
CoglTextureType
_cogl_pipeline_layer_get_texture_type (CoglPipelineLayer *layer);
CoglPipelineFilter
_cogl_pipeline_layer_get_min_filter (CoglPipelineLayer *layer);
CoglPipelineFilter
_cogl_pipeline_layer_get_mag_filter (CoglPipelineLayer *layer);
CoglPipelineWrapMode
_cogl_pipeline_layer_get_wrap_mode_s (CoglPipelineLayer *layer);
CoglPipelineWrapMode
_cogl_pipeline_layer_get_wrap_mode_t (CoglPipelineLayer *layer);
CoglPipelineWrapMode
_cogl_pipeline_layer_get_wrap_mode_p (CoglPipelineLayer *layer);
unsigned long
_cogl_pipeline_layer_compare_differences (CoglPipelineLayer *layer0,
CoglPipelineLayer *layer1);
CoglPipelineLayer *
_cogl_pipeline_layer_get_authority (CoglPipelineLayer *layer,
unsigned long difference);
CoglTexture *
_cogl_pipeline_layer_get_texture (CoglPipelineLayer *layer);
int
_cogl_pipeline_layer_get_unit_index (CoglPipelineLayer *layer);
gboolean
_cogl_pipeline_layer_needs_combine_separate
(CoglPipelineLayer *combine_authority);
#endif /* __COGL_PIPELINE_LAYER_PRIVATE_H */
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