text: #pragma once
  
  ////////////////////////////////////////////////////////////////////////////////
  // The MIT License (MIT)
  //
  // Copyright (c) 2018 Nicholas Frechette & Animation Compression Library contributors
  //
  // 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.
  ////////////////////////////////////////////////////////////////////////////////
  
  #include "acl/core/error.h"
  #include "acl/core/impl/compiler_utils.h"
  
  #include <rtm/qvvf.h>
  
  #include <cstdint>
  
  ACL_IMPL_FILE_PRAGMA_PUSH
  
  namespace acl
  {
  	//////////////////////////////////////////////////////////////////////////
  	// Describes the format used by the additive clip.
  	enum class additive_clip_format8 : uint8_t
  	{
  		//////////////////////////////////////////////////////////////////////////
  		// Clip is not additive
  		none				= 0,
  
  		//////////////////////////////////////////////////////////////////////////
  		// Clip is in relative space, transform_mul or equivalent is used to combine them.
  		// transform = transform_mul(additive_transform, base_transform)
  		relative			= 1,
  
  		//////////////////////////////////////////////////////////////////////////
  		// Clip is in additive space where scale is combined with: base_scale * additive_scale
  		// transform = transform_add0(additive_transform, base_transform)
  		additive0			= 2,
  
  		//////////////////////////////////////////////////////////////////////////
  		// Clip is in additive space where scale is combined with: base_scale * (1.0 + additive_scale)
  		// transform = transform_add1(additive_transform, base_transform)
  		additive1			= 3,
  	};
  
  	//////////////////////////////////////////////////////////////////////////
  
  	// TODO: constexpr
  	inline const char* get_additive_clip_format_name(additive_clip_format8 format)
  	{
  		switch (format)
  		{
  		case additive_clip_format8::none:			return "none";
  		case additive_clip_format8::relative:		return "relative";
  		case additive_clip_format8::additive0:		return "additive0";
  		case additive_clip_format8::additive1:		return "additive1";
  		default:									return "<Invalid>";
  		}
  	}
  
  	inline bool get_additive_clip_format(const char* format, additive_clip_format8& out_format)
  	{
  		ACL_ASSERT(format != nullptr, "Format name cannot be null");
  		if (format == nullptr)
  			return false;
  
  		const char* none_format = "None";	// ACL_DEPRECATED Legacy name, keep for backwards compatibility, remove in 3.0
  		const char* none_format_new = "none";
  		if (std::strncmp(format, none_format, std::strlen(none_format)) == 0
  			|| std::strncmp(format, none_format_new, std::strlen(none_format_new)) == 0)
  		{
  			out_format = additive_clip_format8::none;
  			return true;
  		}
  
  		const char* relative_format = "Relative";	// ACL_DEPRECATED Legacy name, keep for backwards compatibility, remove in 3.0
  		const char* relative_format_new = "relative";
  		if (std::strncmp(format, relative_format, std::strlen(relative_format)) == 0
  			|| std::strncmp(format, relative_format_new, std::strlen(relative_format_new)) == 0)
  		{
  			out_format = additive_clip_format8::relative;
  			return true;
  		}
  
  		const char* additive0_format = "Additive0";	// ACL_DEPRECATED Legacy name, keep for backwards compatibility, remove in 3.0
  		const char* additive0_format_new = "additive0";
  		if (std::strncmp(format, additive0_format, std::strlen(additive0_format)) == 0
  			|| std::strncmp(format, additive0_format_new, std::strlen(additive0_format_new)) == 0)
  		{
  			out_format = additive_clip_format8::additive0;
  			return true;
  		}
  
  		const char* additive1_format = "Additive1";	// ACL_DEPRECATED Legacy name, keep for backwards compatibility, remove in 3.0
  		const char* additive1_format_new = "additive1";
  		if (std::strncmp(format, additive1_format, std::strlen(additive1_format)) == 0
  			|| std::strncmp(format, additive1_format_new, std::strlen(additive1_format_new)) == 0)
  		{
  			out_format = additive_clip_format8::additive1;
  			return true;
  		}
  
  		return false;
  	}
  
  	inline rtm::vector4f RTM_SIMD_CALL get_default_scale(additive_clip_format8 additive_format)
  	{
  		return additive_format == additive_clip_format8::additive1 ? rtm::vector_zero() : rtm::vector_set(1.0F);
  	}
  
  	inline rtm::qvvf RTM_SIMD_CALL transform_add0(rtm::qvvf_arg0 base, rtm::qvvf_arg1 additive)
  	{
  		const rtm::quatf rotation = rtm::quat_mul(additive.rotation, base.rotation);
  		const rtm::vector4f translation = rtm::vector_add(additive.translation, base.translation);
  		const rtm::vector4f scale = rtm::vector_mul(additive.scale, base.scale);
  		return rtm::qvv_set(rotation, translation, scale);
  	}
  
  	inline rtm::qvvf RTM_SIMD_CALL transform_add1(rtm::qvvf_arg0 base, rtm::qvvf_arg1 additive)
  	{
  		const rtm::quatf rotation = rtm::quat_mul(additive.rotation, base.rotation);
  		const rtm::vector4f translation = rtm::vector_add(additive.translation, base.translation);
  		const rtm::vector4f scale = rtm::vector_mul(rtm::vector_add(rtm::vector_set(1.0F), additive.scale), base.scale);
  		return rtm::qvv_set(rotation, translation, scale);
  	}
  
  	inline rtm::qvvf RTM_SIMD_CALL transform_add_no_scale(rtm::qvvf_arg0 base, rtm::qvvf_arg1 additive)
  	{
  		const rtm::quatf rotation = rtm::quat_mul(additive.rotation, base.rotation);
  		const rtm::vector4f translation = rtm::vector_add(additive.translation, base.translation);
  		return rtm::qvv_set(rotation, translation, rtm::vector_set(1.0F));
  	}
  
  	inline rtm::qvvf RTM_SIMD_CALL apply_additive_to_base(additive_clip_format8 additive_format, rtm::qvvf_arg0 base, rtm::qvvf_arg1 additive)
  	{
  		switch (additive_format)
  		{
  		default:
  		case additive_clip_format8::none:			return additive;
  		case additive_clip_format8::relative:		return rtm::qvv_mul(additive, base);
  		case additive_clip_format8::additive0:		return transform_add0(base, additive);
  		case additive_clip_format8::additive1:		return transform_add1(base, additive);
  		}
  	}
  
  	inline rtm::qvvf RTM_SIMD_CALL apply_additive_to_base_no_scale(additive_clip_format8 additive_format, rtm::qvvf_arg0 base, rtm::qvvf_arg1 additive)
  	{
  		switch (additive_format)
  		{
  		default:
  		case additive_clip_format8::none:			return additive;
  		case additive_clip_format8::relative:		return rtm::qvv_mul_no_scale(additive, base);
  		case additive_clip_format8::additive0:		return transform_add_no_scale(base, additive);
  		case additive_clip_format8::additive1:		return transform_add_no_scale(base, additive);
  		}
  	}
  
  	inline rtm::qvvf RTM_SIMD_CALL convert_to_relative(rtm::qvvf_arg0 base, rtm::qvvf_arg1 transform)
  	{
  		return rtm::qvv_mul(transform, rtm::qvv_inverse(base));
  	}
  
  	inline rtm::qvvf RTM_SIMD_CALL convert_to_additive0(rtm::qvvf_arg0 base, rtm::qvvf_arg1 transform)
  	{
  		const rtm::quatf rotation = rtm::quat_mul(transform.rotation, rtm::quat_conjugate(base.rotation));
  		const rtm::vector4f translation = rtm::vector_sub(transform.translation, base.translation);
  		const rtm::vector4f scale = rtm::vector_div(transform.scale, base.scale);
  		return rtm::qvv_set(rotation, translation, scale);
  	}
  
  	inline rtm::qvvf RTM_SIMD_CALL convert_to_additive1(rtm::qvvf_arg0 base, rtm::qvvf_arg1 transform)
  	{
  		const rtm::quatf rotation = rtm::quat_mul(transform.rotation, rtm::quat_conjugate(base.rotation));
  		const rtm::vector4f translation = rtm::vector_sub(transform.translation, base.translation);
  		const rtm::vector4f scale = rtm::vector_sub(rtm::vector_mul(transform.scale, rtm::vector_reciprocal(base.scale)), rtm::vector_set(1.0F));
  		return rtm::qvv_set(rotation, translation, scale);
  	}
  }
  
  ACL_IMPL_FILE_PRAGMA_POP
  