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/*
* Copyright 2009, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// This file contains the declaration of ParamCache.
#ifndef O3D_CORE_CROSS_PARAM_CACHE_H_
#define O3D_CORE_CROSS_PARAM_CACHE_H_
#include <vector>
#include "core/cross/param_object.h"
#include "core/cross/stream_bank.h"
namespace o3d {
class Element;
class Renderer;
class Material;
class DrawElement;
class Effect;
// A ParamCache holds on to a specific set of Platform specific shader params
// to O3D param cached map to make rendering faster.
class ParamCache {
public:
ParamCache() : rebuild_cache_(true) {}
virtual ~ParamCache() {}
// Clears any internal Param to Shader Parameter cache.
void ClearParamCache();
// Checks if the cache of Params to Effect parameters is valid and if it is
// not rebuilds the cache.
// Returns true if the cache was valid, false if it was rebuilt.
bool ValidateAndCacheParams(Effect* effect,
DrawElement* draw_element,
Element* element,
StreamBank* stream_bank,
Material* material,
ParamObject* override);
// Update the cache of params.
virtual void UpdateCache(Effect* effect,
DrawElement* draw_element,
Element* element,
Material* material,
ParamObject* override) = 0;
protected:
// Validates platform specific information about the effect.
// Returns:
// True if effect and cache are valid.
virtual bool ValidateEffect(Effect* effect) = 0;
private:
// If true we need to rebuild the cache of Params to Shader Parameters.
bool rebuild_cache_;
// A class to track the change of an object and its parameters.
template <typename T, typename TPOINTER>
class ChangeTracker {
public:
ChangeTracker()
: last_object_(NULL),
last_change_count_(0) {
}
inline bool NeedToUpdate(TPOINTER object) {
return object != last_object_ ||
(object != NULL &&
object->change_count() != last_change_count_);
}
inline void Update(TPOINTER object) {
last_object_ = T(object);
last_change_count_ = object->change_count();
}
private:
T last_object_;
int last_change_count_;
};
// These fields track whether this cache matches a certain set of inputs.
ChangeTracker<ParamObject::Ref, ParamObject*> draw_element_tracker_;
ChangeTracker<ParamObject::Ref, ParamObject*> element_tracker_;
ChangeTracker<ParamObject::Ref, ParamObject*> material_tracker_;
ChangeTracker<ParamObject::Ref, ParamObject*> effect_tracker_;
ChangeTracker<StreamBank::Ref, StreamBank*> stream_bank_tracker_;
ChangeTracker<ParamObject*, ParamObject*> override_tracker_;
// NOTE: override_tracker_ has to be a pointer, not a Ref because the cache is
// stored inside a Transform and ends up referencing itself making it
// unfreeable. Is okay that it's a pointer though because a cache is always
// used for by a transform for itself so there is no chance that the
// override_tracker's pointer will point to something that was freed.
DISALLOW_COPY_AND_ASSIGN(ParamCache);
};
// A ParamCacheManager manages an array of ParamCaches.
class ParamCacheManager {
public:
explicit ParamCacheManager(Renderer* renderer);
~ParamCacheManager();
// Returns the next ParamCache
// Returns:
// The next ParamCache
ParamCache* GetNextCache(Renderer* renderer);
private:
typedef std::vector<ParamCache*> ParamCacheArray;
ParamCacheArray param_caches_;
unsigned top_cache_index_;
// If this does not match the current render count we need to reset
// the top cache.
int last_render_count_;
DISALLOW_COPY_AND_ASSIGN(ParamCacheManager);
};
} // namespace o3d
#endif // O3D_CORE_CROSS_PARAM_CACHE_H_
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