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Diffstat (limited to 'indra/llprimitive/llgltfmaterial.cpp')
| -rw-r--r-- | indra/llprimitive/llgltfmaterial.cpp | 704 |
1 files changed, 704 insertions, 0 deletions
diff --git a/indra/llprimitive/llgltfmaterial.cpp b/indra/llprimitive/llgltfmaterial.cpp new file mode 100644 index 0000000000..c16803d39d --- /dev/null +++ b/indra/llprimitive/llgltfmaterial.cpp @@ -0,0 +1,704 @@ +/** + * @file llgltfmaterial.cpp + * @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 + * $/LicenseInfo$ + */ + +#include "linden_common.h" + +#include "llgltfmaterial.h" + +// NOTE -- this should be the one and only place tiny_gltf.h is included +#include "tinygltf/tiny_gltf.h" + +const char* const LLGLTFMaterial::ASSET_VERSION = "1.1"; +const char* const LLGLTFMaterial::ASSET_TYPE = "GLTF 2.0"; +const std::array<std::string, 2> LLGLTFMaterial::ACCEPTED_ASSET_VERSIONS = { "1.0", "1.1" }; + +const char* const GLTF_FILE_EXTENSION_TRANSFORM = "KHR_texture_transform"; +const char* const GLTF_FILE_EXTENSION_TRANSFORM_SCALE = "scale"; +const char* const GLTF_FILE_EXTENSION_TRANSFORM_OFFSET = "offset"; +const char* const GLTF_FILE_EXTENSION_TRANSFORM_ROTATION = "rotation"; + +// special UUID that indicates a null UUID in override data +static const LLUUID GLTF_OVERRIDE_NULL_UUID = LLUUID("ffffffff-ffff-ffff-ffff-ffffffffffff"); + +void LLGLTFMaterial::TextureTransform::getPacked(F32 (&packed)[8]) const +{ + packed[0] = mScale.mV[VX]; + packed[1] = mScale.mV[VY]; + packed[2] = mRotation; + // packed[3] = unused + packed[4] = mOffset.mV[VX]; + packed[5] = mOffset.mV[VY]; + // packed[6] = unused + // packed[7] = unused +} + +bool LLGLTFMaterial::TextureTransform::operator==(const TextureTransform& other) const +{ + return mOffset == other.mOffset && mScale == other.mScale && mRotation == other.mRotation; +} + +LLGLTFMaterial::LLGLTFMaterial(const LLGLTFMaterial& rhs) +{ + *this = rhs; +} + +LLGLTFMaterial& LLGLTFMaterial::operator=(const LLGLTFMaterial& rhs) +{ + //have to do a manual operator= because of LLRefCount + mTextureId = rhs.mTextureId; + + mTextureTransform = rhs.mTextureTransform; + + mBaseColor = rhs.mBaseColor; + mEmissiveColor = rhs.mEmissiveColor; + + mMetallicFactor = rhs.mMetallicFactor; + mRoughnessFactor = rhs.mRoughnessFactor; + mAlphaCutoff = rhs.mAlphaCutoff; + + mDoubleSided = rhs.mDoubleSided; + mAlphaMode = rhs.mAlphaMode; + + mOverrideDoubleSided = rhs.mOverrideDoubleSided; + mOverrideAlphaMode = rhs.mOverrideAlphaMode; + + return *this; +} + +bool LLGLTFMaterial::operator==(const LLGLTFMaterial& rhs) const +{ + return mTextureId == rhs.mTextureId && + + mTextureTransform == rhs.mTextureTransform && + + mBaseColor == rhs.mBaseColor && + mEmissiveColor == rhs.mEmissiveColor && + + mMetallicFactor == rhs.mMetallicFactor && + mRoughnessFactor == rhs.mRoughnessFactor && + mAlphaCutoff == rhs.mAlphaCutoff && + + mDoubleSided == rhs.mDoubleSided && + mAlphaMode == rhs.mAlphaMode && + + mOverrideDoubleSided == rhs.mOverrideDoubleSided && + mOverrideAlphaMode == rhs.mOverrideAlphaMode; +} + +bool LLGLTFMaterial::fromJSON(const std::string& json, std::string& warn_msg, std::string& error_msg) +{ + LL_PROFILE_ZONE_SCOPED; + tinygltf::TinyGLTF gltf; + + tinygltf::Model model_in; + + if (gltf.LoadASCIIFromString(&model_in, &error_msg, &warn_msg, json.c_str(), json.length(), "")) + { + setFromModel(model_in, 0); + + return true; + } + return false; +} + +std::string LLGLTFMaterial::asJSON(bool prettyprint) const +{ + LL_PROFILE_ZONE_SCOPED; + tinygltf::TinyGLTF gltf; + + tinygltf::Model model_out; + + std::ostringstream str; + + writeToModel(model_out, 0); + + // To ensure consistency in asset upload, this should be the only reference + // to WriteGltfSceneToStream in the viewer. + gltf.WriteGltfSceneToStream(&model_out, str, prettyprint, false); + + return str.str(); +} + +void LLGLTFMaterial::setFromModel(const tinygltf::Model& model, S32 mat_index) +{ + LL_PROFILE_ZONE_SCOPED; + if (model.materials.size() <= mat_index) + { + return; + } + + const tinygltf::Material& material_in = model.materials[mat_index]; + + // Apply base color texture + setFromTexture(model, material_in.pbrMetallicRoughness.baseColorTexture, GLTF_TEXTURE_INFO_BASE_COLOR); + // Apply normal map + setFromTexture(model, material_in.normalTexture, GLTF_TEXTURE_INFO_NORMAL); + // Apply metallic-roughness texture + setFromTexture(model, material_in.pbrMetallicRoughness.metallicRoughnessTexture, GLTF_TEXTURE_INFO_METALLIC_ROUGHNESS); + // Apply emissive texture + setFromTexture(model, material_in.emissiveTexture, GLTF_TEXTURE_INFO_EMISSIVE); + + setAlphaMode(material_in.alphaMode); + mAlphaCutoff = llclamp((F32)material_in.alphaCutoff, 0.f, 1.f); + + mBaseColor.set(material_in.pbrMetallicRoughness.baseColorFactor); + mEmissiveColor.set(material_in.emissiveFactor); + + mMetallicFactor = llclamp((F32)material_in.pbrMetallicRoughness.metallicFactor, 0.f, 1.f); + mRoughnessFactor = llclamp((F32)material_in.pbrMetallicRoughness.roughnessFactor, 0.f, 1.f); + + mDoubleSided = material_in.doubleSided; + + if (material_in.extras.IsObject()) + { + tinygltf::Value::Object extras = material_in.extras.Get<tinygltf::Value::Object>(); + const auto& alpha_mode = extras.find("override_alpha_mode"); + if (alpha_mode != extras.end()) + { + mOverrideAlphaMode = alpha_mode->second.Get<bool>(); + } + + const auto& double_sided = extras.find("override_double_sided"); + if (double_sided != extras.end()) + { + mOverrideDoubleSided = double_sided->second.Get<bool>(); + } + } +} + +LLVector2 vec2_from_json(const tinygltf::Value::Object& object, const char* key, const LLVector2& default_value) +{ + const auto it = object.find(key); + if (it == object.end()) + { + return default_value; + } + const tinygltf::Value& vec2_json = std::get<1>(*it); + if (!vec2_json.IsArray() || vec2_json.ArrayLen() < LENGTHOFVECTOR2) + { + return default_value; + } + LLVector2 value; + for (U32 i = 0; i < LENGTHOFVECTOR2; ++i) + { + const tinygltf::Value& real_json = vec2_json.Get(i); + if (!real_json.IsReal()) + { + return default_value; + } + value.mV[i] = (F32)real_json.Get<double>(); + } + return value; +} + +F32 float_from_json(const tinygltf::Value::Object& object, const char* key, const F32 default_value) +{ + const auto it = object.find(key); + if (it == object.end()) + { + return default_value; + } + const tinygltf::Value& real_json = std::get<1>(*it); + if (!real_json.IsReal()) + { + return default_value; + } + return (F32)real_json.GetNumberAsDouble(); +} + +template<typename T> +std::string gltf_get_texture_image(const tinygltf::Model& model, const T& texture_info) +{ + const S32 texture_idx = texture_info.index; + if (texture_idx < 0 || texture_idx >= model.textures.size()) + { + return ""; + } + const tinygltf::Texture& texture = model.textures[texture_idx]; + + // Ignore texture.sampler for now + + const S32 image_idx = texture.source; + if (image_idx < 0 || image_idx >= model.images.size()) + { + return ""; + } + const tinygltf::Image& image = model.images[image_idx]; + + return image.uri; +} + +// *NOTE: Use template here as workaround for the different similar texture info classes +template<typename T> +void LLGLTFMaterial::setFromTexture(const tinygltf::Model& model, const T& texture_info, TextureInfo texture_info_id) +{ + LL_PROFILE_ZONE_SCOPED; + const std::string uri = gltf_get_texture_image(model, texture_info); + mTextureId[texture_info_id].set(uri); + + const tinygltf::Value::Object& extensions_object = texture_info.extensions; + const auto transform_it = extensions_object.find(GLTF_FILE_EXTENSION_TRANSFORM); + if (transform_it != extensions_object.end()) + { + const tinygltf::Value& transform_json = std::get<1>(*transform_it); + if (transform_json.IsObject()) + { + const tinygltf::Value::Object& transform_object = transform_json.Get<tinygltf::Value::Object>(); + TextureTransform& transform = mTextureTransform[texture_info_id]; + transform.mOffset = vec2_from_json(transform_object, GLTF_FILE_EXTENSION_TRANSFORM_OFFSET, getDefaultTextureOffset()); + transform.mScale = vec2_from_json(transform_object, GLTF_FILE_EXTENSION_TRANSFORM_SCALE, getDefaultTextureScale()); + transform.mRotation = float_from_json(transform_object, GLTF_FILE_EXTENSION_TRANSFORM_ROTATION, getDefaultTextureRotation()); + } + } +} + +void LLGLTFMaterial::writeToModel(tinygltf::Model& model, S32 mat_index) const +{ + LL_PROFILE_ZONE_SCOPED; + if (model.materials.size() < mat_index+1) + { + model.materials.resize(mat_index + 1); + } + + tinygltf::Material& material_out = model.materials[mat_index]; + + // set base color texture + writeToTexture(model, material_out.pbrMetallicRoughness.baseColorTexture, GLTF_TEXTURE_INFO_BASE_COLOR); + // set normal texture + writeToTexture(model, material_out.normalTexture, GLTF_TEXTURE_INFO_NORMAL); + // set metallic-roughness texture + writeToTexture(model, material_out.pbrMetallicRoughness.metallicRoughnessTexture, GLTF_TEXTURE_INFO_METALLIC_ROUGHNESS); + // set emissive texture + writeToTexture(model, material_out.emissiveTexture, GLTF_TEXTURE_INFO_EMISSIVE); + // set occlusion texture + // *NOTE: This is required for ORM materials for GLTF compliance. + // See: https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html#_material_occlusiontexture + writeToTexture(model, material_out.occlusionTexture, GLTF_TEXTURE_INFO_OCCLUSION); + + + material_out.alphaMode = getAlphaMode(); + material_out.alphaCutoff = mAlphaCutoff; + + mBaseColor.write(material_out.pbrMetallicRoughness.baseColorFactor); + + if (mEmissiveColor != LLGLTFMaterial::getDefaultEmissiveColor()) + { + material_out.emissiveFactor.resize(3); + mEmissiveColor.write(material_out.emissiveFactor); + } + + material_out.pbrMetallicRoughness.metallicFactor = mMetallicFactor; + material_out.pbrMetallicRoughness.roughnessFactor = mRoughnessFactor; + + material_out.doubleSided = mDoubleSided; + + // generate "extras" string + tinygltf::Value::Object extras; + bool write_extras = false; + if (mOverrideAlphaMode && mAlphaMode == getDefaultAlphaMode()) + { + extras["override_alpha_mode"] = tinygltf::Value(mOverrideAlphaMode); + write_extras = true; + } + + if (mOverrideDoubleSided && mDoubleSided == getDefaultDoubleSided()) + { + extras["override_double_sided"] = tinygltf::Value(mOverrideDoubleSided); + write_extras = true; + } + + if (write_extras) + { + material_out.extras = tinygltf::Value(extras); + } + + model.asset.version = "2.0"; +} + +template<typename T> +void gltf_allocate_texture_image(tinygltf::Model& model, T& texture_info, const std::string& uri) +{ + const S32 image_idx = model.images.size(); + model.images.emplace_back(); + model.images[image_idx].uri = uri; + + // The texture, not to be confused with the texture info + const S32 texture_idx = model.textures.size(); + model.textures.emplace_back(); + tinygltf::Texture& texture = model.textures[texture_idx]; + texture.source = image_idx; + + texture_info.index = texture_idx; +} + +template<typename T> +void LLGLTFMaterial::writeToTexture(tinygltf::Model& model, T& texture_info, TextureInfo texture_info_id, bool force_write) const +{ + LL_PROFILE_ZONE_SCOPED; + const LLUUID& texture_id = mTextureId[texture_info_id]; + const TextureTransform& transform = mTextureTransform[texture_info_id]; + const bool is_blank_transform = transform == sDefault.mTextureTransform[0]; + // Check if this material matches all the fallback values, and if so, then + // skip including it to reduce material size + if (!force_write && texture_id.isNull() && is_blank_transform) + { + return; + } + + // tinygltf will discard this texture info if there is no valid texture, + // causing potential loss of information for overrides, so ensure one is + // defined. -Cosmic,2023-01-30 + gltf_allocate_texture_image(model, texture_info, texture_id.asString()); + + if (!is_blank_transform) + { + tinygltf::Value::Object transform_map; + transform_map[GLTF_FILE_EXTENSION_TRANSFORM_OFFSET] = tinygltf::Value(tinygltf::Value::Array({ + tinygltf::Value(transform.mOffset.mV[VX]), + tinygltf::Value(transform.mOffset.mV[VY]) + })); + transform_map[GLTF_FILE_EXTENSION_TRANSFORM_SCALE] = tinygltf::Value(tinygltf::Value::Array({ + tinygltf::Value(transform.mScale.mV[VX]), + tinygltf::Value(transform.mScale.mV[VY]) + })); + transform_map[GLTF_FILE_EXTENSION_TRANSFORM_ROTATION] = tinygltf::Value(transform.mRotation); + texture_info.extensions[GLTF_FILE_EXTENSION_TRANSFORM] = tinygltf::Value(transform_map); + } +} + +void LLGLTFMaterial::sanitizeAssetMaterial() +{ + mTextureTransform = sDefault.mTextureTransform; +} + +bool LLGLTFMaterial::setBaseMaterial() +{ + const LLGLTFMaterial old_override = *this; + *this = sDefault; + setBaseMaterial(old_override); + return *this != old_override; +} + +bool LLGLTFMaterial::isClearedForBaseMaterial() +{ + LLGLTFMaterial cleared_override = sDefault; + cleared_override.setBaseMaterial(*this); + return *this == cleared_override; +} + +// For material overrides only. Copies transforms from the old override. +void LLGLTFMaterial::setBaseMaterial(const LLGLTFMaterial& old_override_mat) +{ + mTextureTransform = old_override_mat.mTextureTransform; +} + + +// static +void LLGLTFMaterial::hackOverrideUUID(LLUUID& id) +{ + if (id == LLUUID::null) + { + id = GLTF_OVERRIDE_NULL_UUID; + } +} + +void LLGLTFMaterial::setTextureId(TextureInfo texture_info, const LLUUID& id, bool for_override) +{ + mTextureId[texture_info] = id; + if (for_override) + { + hackOverrideUUID(mTextureId[texture_info]); + } +} + +void LLGLTFMaterial::setBaseColorId(const LLUUID& id, bool for_override) +{ + setTextureId(GLTF_TEXTURE_INFO_BASE_COLOR, id, for_override); +} + +void LLGLTFMaterial::setNormalId(const LLUUID& id, bool for_override) +{ + setTextureId(GLTF_TEXTURE_INFO_NORMAL, id, for_override); +} + +void LLGLTFMaterial::setOcclusionRoughnessMetallicId(const LLUUID& id, bool for_override) +{ + setTextureId(GLTF_TEXTURE_INFO_METALLIC_ROUGHNESS, id, for_override); +} + +void LLGLTFMaterial::setEmissiveId(const LLUUID& id, bool for_override) +{ + setTextureId(GLTF_TEXTURE_INFO_EMISSIVE, id, for_override); +} + +void LLGLTFMaterial::setBaseColorFactor(const LLColor4& baseColor, bool for_override) +{ + mBaseColor.set(baseColor); + mBaseColor.clamp(); + + if (for_override) + { // hack -- nudge off of default value + if (mBaseColor == getDefaultBaseColor()) + { + mBaseColor.mV[3] -= FLT_EPSILON; + } + } +} + +void LLGLTFMaterial::setAlphaCutoff(F32 cutoff, bool for_override) +{ + mAlphaCutoff = llclamp(cutoff, 0.f, 1.f); + if (for_override) + { // hack -- nudge off of default value + if (mAlphaCutoff == getDefaultAlphaCutoff()) + { + mAlphaCutoff -= FLT_EPSILON; + } + } +} + +void LLGLTFMaterial::setEmissiveColorFactor(const LLColor3& emissiveColor, bool for_override) +{ + mEmissiveColor = emissiveColor; + mEmissiveColor.clamp(); + + if (for_override) + { // hack -- nudge off of default value + if (mEmissiveColor == getDefaultEmissiveColor()) + { + mEmissiveColor.mV[0] += FLT_EPSILON; + } + } +} + +void LLGLTFMaterial::setMetallicFactor(F32 metallic, bool for_override) +{ + mMetallicFactor = llclamp(metallic, 0.f, for_override ? 1.f - FLT_EPSILON : 1.f); +} + +void LLGLTFMaterial::setRoughnessFactor(F32 roughness, bool for_override) +{ + mRoughnessFactor = llclamp(roughness, 0.f, for_override ? 1.f - FLT_EPSILON : 1.f); +} + +void LLGLTFMaterial::setAlphaMode(const std::string& mode, bool for_override) +{ + S32 m = getDefaultAlphaMode(); + if (mode == "MASK") + { + m = ALPHA_MODE_MASK; + } + else if (mode == "BLEND") + { + m = ALPHA_MODE_BLEND; + } + + setAlphaMode(m, for_override); +} + +const char* LLGLTFMaterial::getAlphaMode() const +{ + switch (mAlphaMode) + { + case ALPHA_MODE_MASK: return "MASK"; + case ALPHA_MODE_BLEND: return "BLEND"; + default: return "OPAQUE"; + } +} + +void LLGLTFMaterial::setAlphaMode(S32 mode, bool for_override) +{ + mAlphaMode = (AlphaMode) llclamp(mode, (S32) ALPHA_MODE_OPAQUE, (S32) ALPHA_MODE_MASK); + mOverrideAlphaMode = for_override && mAlphaMode == getDefaultAlphaMode(); +} + +void LLGLTFMaterial::setDoubleSided(bool double_sided, bool for_override) +{ + // sure, no clamping will ever be needed for a bool, but include the + // setter for consistency with the clamping API + mDoubleSided = double_sided; + mOverrideDoubleSided = for_override && mDoubleSided == getDefaultDoubleSided(); +} + +void LLGLTFMaterial::setTextureOffset(TextureInfo texture_info, const LLVector2& offset) +{ + mTextureTransform[texture_info].mOffset = offset; +} + +void LLGLTFMaterial::setTextureScale(TextureInfo texture_info, const LLVector2& scale) +{ + mTextureTransform[texture_info].mScale = scale; +} + +void LLGLTFMaterial::setTextureRotation(TextureInfo texture_info, float rotation) +{ + mTextureTransform[texture_info].mRotation = rotation; +} + +// Default value accessors (NOTE: these MUST match the GLTF specification) + +// Make a static default material for accessors +const LLGLTFMaterial LLGLTFMaterial::sDefault; + +F32 LLGLTFMaterial::getDefaultAlphaCutoff() +{ + return sDefault.mAlphaCutoff; +} + +S32 LLGLTFMaterial::getDefaultAlphaMode() +{ + return (S32) sDefault.mAlphaMode; +} + +F32 LLGLTFMaterial::getDefaultMetallicFactor() +{ + return sDefault.mMetallicFactor; +} + +F32 LLGLTFMaterial::getDefaultRoughnessFactor() +{ + return sDefault.mRoughnessFactor; +} + +LLColor4 LLGLTFMaterial::getDefaultBaseColor() +{ + return sDefault.mBaseColor; +} + +LLColor3 LLGLTFMaterial::getDefaultEmissiveColor() +{ + return sDefault.mEmissiveColor; +} + +bool LLGLTFMaterial::getDefaultDoubleSided() +{ + return sDefault.mDoubleSided; +} + +LLVector2 LLGLTFMaterial::getDefaultTextureOffset() +{ + return sDefault.mTextureTransform[0].mOffset; +} + +LLVector2 LLGLTFMaterial::getDefaultTextureScale() +{ + return sDefault.mTextureTransform[0].mScale; +} + +F32 LLGLTFMaterial::getDefaultTextureRotation() +{ + return sDefault.mTextureTransform[0].mRotation; +} + +// static +void LLGLTFMaterial::applyOverrideUUID(LLUUID& dst_id, const LLUUID& override_id) +{ + if (override_id != GLTF_OVERRIDE_NULL_UUID) + { + if (override_id != LLUUID::null) + { + dst_id = override_id; + } + } + else + { + dst_id = LLUUID::null; + } +} + +void LLGLTFMaterial::applyOverride(const LLGLTFMaterial& override_mat) +{ + LL_PROFILE_ZONE_SCOPED; + + for (int i = 0; i < GLTF_TEXTURE_INFO_COUNT; ++i) + { + LLUUID& texture_id = mTextureId[i]; + const LLUUID& override_texture_id = override_mat.mTextureId[i]; + applyOverrideUUID(texture_id, override_texture_id); + } + + if (override_mat.mBaseColor != getDefaultBaseColor()) + { + mBaseColor = override_mat.mBaseColor; + } + + if (override_mat.mEmissiveColor != getDefaultEmissiveColor()) + { + mEmissiveColor = override_mat.mEmissiveColor; + } + + if (override_mat.mMetallicFactor != getDefaultMetallicFactor()) + { + mMetallicFactor = override_mat.mMetallicFactor; + } + + if (override_mat.mRoughnessFactor != getDefaultRoughnessFactor()) + { + mRoughnessFactor = override_mat.mRoughnessFactor; + } + + if (override_mat.mAlphaMode != getDefaultAlphaMode() || override_mat.mOverrideAlphaMode) + { + mAlphaMode = override_mat.mAlphaMode; + } + if (override_mat.mAlphaCutoff != getDefaultAlphaCutoff()) + { + mAlphaCutoff = override_mat.mAlphaCutoff; + } + + if (override_mat.mDoubleSided != getDefaultDoubleSided() || override_mat.mOverrideDoubleSided) + { + mDoubleSided = override_mat.mDoubleSided; + } + + for (int i = 0; i < GLTF_TEXTURE_INFO_COUNT; ++i) + { + if (override_mat.mTextureTransform[i].mOffset != getDefaultTextureOffset()) + { + mTextureTransform[i].mOffset = override_mat.mTextureTransform[i].mOffset; + } + + if (override_mat.mTextureTransform[i].mScale != getDefaultTextureScale()) + { + mTextureTransform[i].mScale = override_mat.mTextureTransform[i].mScale; + } + + if (override_mat.mTextureTransform[i].mRotation != getDefaultTextureRotation()) + { + mTextureTransform[i].mRotation = override_mat.mTextureTransform[i].mRotation; + } + } +} + +LLUUID LLGLTFMaterial::getHash() const +{ + LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE; + // HACK - hash the bytes of this object but don't include the ref count + LLUUID hash; + HBXXH128::digest(hash, (unsigned char*)this + sizeof(LLRefCount), sizeof(*this) - sizeof(LLRefCount)); + return hash; +} + |