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/**
* @file llgltfmaterial.h
* @brief Material definition
*
* $LicenseInfo:firstyear=2022&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2022, Linden Research, Inc.
*
* 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;
* version 2.1 of the License only.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#pragma once
#include "llrefcount.h"
#include "llmemory.h"
#include "m3math.h"
#include "v4color.h"
#include "v3color.h"
#include "v2math.h"
#include "lluuid.h"
#include "llmd5.h"
#include <string>
namespace tinygltf
{
class Model;
}
class LLGLTFMaterial : public LLRefCount
{
public:
// default material for reference
static const LLGLTFMaterial sDefault;
struct TextureTransform
{
LLVector2 mOffset = { 0.f, 0.f };
LLVector2 mScale = { 1.f, 1.f };
F32 mRotation = 0.f;
LLMatrix3 asMatrix();
};
enum AlphaMode
{
ALPHA_MODE_OPAQUE = 0,
ALPHA_MODE_BLEND,
ALPHA_MODE_MASK
};
LLGLTFMaterial() {}
LLGLTFMaterial(const LLGLTFMaterial& rhs);
LLGLTFMaterial& operator=(const LLGLTFMaterial& rhs);
LLUUID mBaseColorId;
LLUUID mNormalId;
LLUUID mMetallicRoughnessId;
LLUUID mEmissiveId;
// NOTE : initialize values to defaults according to the GLTF spec
LLColor4 mBaseColor = LLColor4(1, 1, 1, 1);
LLColor3 mEmissiveColor = LLColor3(0, 0, 0);
F32 mMetallicFactor = 1.f;
F32 mRoughnessFactor = 1.f;
F32 mAlphaCutoff = 0.5f;
bool mDoubleSided = false;
AlphaMode mAlphaMode = ALPHA_MODE_OPAQUE;
// override specific flags for state that can't use off-by-epsilon or UUID hack
bool mOverrideDoubleSided = false;
bool mOverrideAlphaMode = false;
// get a UUID based on a hash of this LLGLTFMaterial
LLUUID getHash() const
{
LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
LLMD5 md5;
md5.update((unsigned char*)this, sizeof(this));
md5.finalize();
LLUUID id;
md5.raw_digest(id.mData);
// *TODO: Hash the overrides
return id;
}
enum TextureInfo : U32
{
GLTF_TEXTURE_INFO_BASE_COLOR,
GLTF_TEXTURE_INFO_NORMAL,
GLTF_TEXTURE_INFO_METALLIC_ROUGHNESS,
GLTF_TEXTURE_INFO_EMISSIVE,
GLTF_TEXTURE_INFO_COUNT
};
std::array<TextureTransform, GLTF_TEXTURE_INFO_COUNT> mTextureTransform;
//setters for various members (will clamp to acceptable ranges)
// for_override - set to true if this value is being set as part of an override (important for handling override to default value)
void setBaseColorId(const LLUUID& id, bool for_override = false);
void setNormalId(const LLUUID& id, bool for_override = false);
void setMetallicRoughnessId(const LLUUID& id, bool for_override = false);
void setEmissiveId(const LLUUID& id, bool for_override = false);
void setBaseColorFactor(const LLColor4& baseColor, bool for_override = false);
void setAlphaCutoff(F32 cutoff, bool for_override = false);
void setEmissiveColorFactor(const LLColor3& emissiveColor, bool for_override = false);
void setMetallicFactor(F32 metallic, bool for_override = false);
void setRoughnessFactor(F32 roughness, bool for_override = false);
void setAlphaMode(S32 mode, bool for_override = false);
void setDoubleSided(bool double_sided, bool for_override = false);
//NOTE: texture offsets only exist in overrides, so "for_override" is not needed
void setTextureOffset(TextureInfo texture_info, const LLVector2& offset);
void setTextureScale(TextureInfo texture_info, const LLVector2& scale);
void setTextureRotation(TextureInfo texture_info, float rotation);
// Default value accessors
static F32 getDefaultAlphaCutoff();
static S32 getDefaultAlphaMode();
static F32 getDefaultMetallicFactor();
static F32 getDefaultRoughnessFactor();
static LLColor4 getDefaultBaseColor();
static LLColor3 getDefaultEmissiveColor();
static bool getDefaultDoubleSided();
static LLVector2 getDefaultTextureOffset();
static LLVector2 getDefaultTextureScale();
static F32 getDefaultTextureRotation();
static void hackOverrideUUID(LLUUID& id);
static void applyOverrideUUID(LLUUID& dst_id, const LLUUID& override_id);
// set mAlphaMode from string.
// Anything otherthan "MASK" or "BLEND" sets mAlphaMode to ALPHA_MODE_OPAQUE
void setAlphaMode(const std::string& mode, bool for_override = false);
const char* getAlphaMode() const;
// set the contents of this LLGLTFMaterial from the given json
// returns true if successful
// json - the json text to load from
// warn_msg - warning message from TinyGLTF if any
// error_msg - error_msg from TinyGLTF if any
bool fromJSON(const std::string& json, std::string& warn_msg, std::string& error_msg);
// get the contents of this LLGLTFMaterial as a json string
std::string asJSON(bool prettyprint = false) const;
// initialize from given tinygltf::Model
// model - the model to reference
// mat_index - index of material in model's material array
void setFromModel(const tinygltf::Model& model, S32 mat_index);
// write to given tinygltf::Model
void writeToModel(tinygltf::Model& model, S32 mat_index) const;
void applyOverride(const LLGLTFMaterial& override_mat);
private:
template<typename T>
void setFromTexture(const tinygltf::Model& model, const T& texture_info, TextureInfo texture_info_id, LLUUID& texture_id_out);
template<typename T>
void writeToTexture(tinygltf::Model& model, T& texture_info, TextureInfo texture_info_id, const LLUUID& texture_id, bool is_override, const LLUUID& base_texture_id) const;
};
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