/*
 * Copyright 2011-2013 Blender Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef __ATTRIBUTE_H__
#define __ATTRIBUTE_H__

#include "kernel/kernel_types.h"

#include "util/util_list.h"
#include "util/util_param.h"
#include "util/util_types.h"
#include "util/util_vector.h"

CCL_NAMESPACE_BEGIN

class Attribute;
class AttributeRequest;
class AttributeRequestSet;
class AttributeSet;
class ImageManager;
class Mesh;
struct Transform;

/* Attributes for voxels are images */

struct VoxelAttribute {
  ImageManager *manager;
  int slot;
};

/* Attribute
 *
 * Arbitrary data layers on meshes.
 * Supported types: Float, Color, Vector, Normal, Point */

class Attribute {
 public:
  ustring name;
  AttributeStandard std;

  TypeDesc type;
  vector<char> buffer;
  AttributeElement element;
  uint flags; /* enum AttributeFlag */

  Attribute()
  {
  }
  ~Attribute();
  void set(ustring name, TypeDesc type, AttributeElement element);
  void resize(Mesh *mesh, AttributePrimitive prim, bool reserve_only);
  void resize(size_t num_elements);

  size_t data_sizeof() const;
  size_t element_size(Mesh *mesh, AttributePrimitive prim) const;
  size_t buffer_size(Mesh *mesh, AttributePrimitive prim) const;

  char *data()
  {
    return (buffer.size()) ? &buffer[0] : NULL;
  }
  float2 *data_float2()
  {
    assert(data_sizeof() == sizeof(float2));
    return (float2 *)data();
  }
  float3 *data_float3()
  {
    assert(data_sizeof() == sizeof(float3));
    return (float3 *)data();
  }
  float4 *data_float4()
  {
    assert(data_sizeof() == sizeof(float4));
    return (float4 *)data();
  }
  float *data_float()
  {
    assert(data_sizeof() == sizeof(float));
    return (float *)data();
  }
  uchar4 *data_uchar4()
  {
    assert(data_sizeof() == sizeof(uchar4));
    return (uchar4 *)data();
  }
  Transform *data_transform()
  {
    assert(data_sizeof() == sizeof(Transform));
    return (Transform *)data();
  }
  VoxelAttribute *data_voxel()
  {
    assert(data_sizeof() == sizeof(VoxelAttribute));
    return (VoxelAttribute *)data();
  }

  const char *data() const
  {
    return (buffer.size()) ? &buffer[0] : NULL;
  }
  const float2 *data_float2() const
  {
    assert(data_sizeof() == sizeof(float2));
    return (const float2 *)data();
  }
  const float3 *data_float3() const
  {
    assert(data_sizeof() == sizeof(float3));
    return (const float3 *)data();
  }
  const float4 *data_float4() const
  {
    assert(data_sizeof() == sizeof(float4));
    return (const float4 *)data();
  }
  const float *data_float() const
  {
    assert(data_sizeof() == sizeof(float));
    return (const float *)data();
  }
  const Transform *data_transform() const
  {
    assert(data_sizeof() == sizeof(Transform));
    return (const Transform *)data();
  }
  const VoxelAttribute *data_voxel() const
  {
    assert(data_sizeof() == sizeof(VoxelAttribute));
    return (const VoxelAttribute *)data();
  }

  void zero_data(void *dst);
  void add_with_weight(void *dst, void *src, float weight);

  void add(const float &f);
  void add(const float2 &f);
  void add(const float3 &f);
  void add(const uchar4 &f);
  void add(const Transform &f);
  void add(const VoxelAttribute &f);
  void add(const char *data);

  static bool same_storage(TypeDesc a, TypeDesc b);
  static const char *standard_name(AttributeStandard std);
  static AttributeStandard name_standard(const char *name);
};

/* Attribute Set
 *
 * Set of attributes on a mesh. */

class AttributeSet {
 public:
  Mesh *triangle_mesh;
  Mesh *curve_mesh;
  Mesh *subd_mesh;
  list<Attribute> attributes;

  AttributeSet();
  ~AttributeSet();

  Attribute *add(ustring name, TypeDesc type, AttributeElement element);
  Attribute *find(ustring name) const;
  void remove(ustring name);

  Attribute *add(AttributeStandard std, ustring name = ustring());
  Attribute *find(AttributeStandard std) const;
  void remove(AttributeStandard std);

  Attribute *find(AttributeRequest &req);

  void remove(Attribute *attribute);

  void resize(bool reserve_only = false);
  void clear(bool preserve_voxel_data = false);
};

/* AttributeRequest
 *
 * Request from a shader to use a certain attribute, so we can figure out
 * which ones we need to export from the host app end store for the kernel.
 * The attribute is found either by name or by standard attribute type. */

class AttributeRequest {
 public:
  ustring name;
  AttributeStandard std;

  /* temporary variables used by MeshManager */
  TypeDesc triangle_type, curve_type, subd_type;
  AttributeDescriptor triangle_desc, curve_desc, subd_desc;

  explicit AttributeRequest(ustring name_);
  explicit AttributeRequest(AttributeStandard std);
};

/* AttributeRequestSet
 *
 * Set of attributes requested by a shader. */

class AttributeRequestSet {
 public:
  vector<AttributeRequest> requests;

  AttributeRequestSet();
  ~AttributeRequestSet();

  void add(ustring name);
  void add(AttributeStandard std);
  void add(AttributeRequestSet &reqs);
  void add_standard(ustring name);

  bool find(ustring name);
  bool find(AttributeStandard std);

  size_t size();
  void clear();

  bool modified(const AttributeRequestSet &other);
};

CCL_NAMESPACE_END

#endif /* __ATTRIBUTE_H__ */