1 files changed, 287 insertions, 0 deletions
diff --git a/indra/newview/gltf/animation.cpp b/indra/newview/gltf/animation.cpp
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+++ b/indra/newview/gltf/animation.cpp
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+/**
+ * @file animation.cpp
+ * @brief LL GLTF Animation Implementation
+ *
+ * $LicenseInfo:firstyear=2024&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2024, 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 "../llviewerprecompiledheaders.h"
+
+#include "asset.h"
+#include "buffer_util.h"
+
+using namespace LL::GLTF;
+
+void Animation::allocateGLResources(Asset& asset)
+{
+    if (!mSamplers.empty())
+    {
+        mMinTime = FLT_MAX;
+        mMaxTime = -FLT_MAX;
+        for (auto& sampler : mSamplers)
+        {
+            sampler.allocateGLResources(asset);
+            mMinTime = llmin(sampler.mMinTime, mMinTime);
+            mMaxTime = llmax(sampler.mMaxTime, mMaxTime);
+        }
+    }
+    else
+    {
+        mMinTime = mMaxTime = 0.f;
+    }
+
+    for (auto& channel : mRotationChannels)
+    {
+        channel.allocateGLResources(asset, mSamplers[channel.mSampler]);
+    }
+
+    for (auto& channel : mTranslationChannels)
+    {
+        channel.allocateGLResources(asset, mSamplers[channel.mSampler]);
+    }
+}
+
+void Animation::update(Asset& asset, F32 dt)
+{
+    mTime += dt;
+
+    apply(asset, mTime);
+}
+
+void Animation::apply(Asset& asset, float time)
+{
+    // convert time to animation loop time
+    time = fmod(time, mMaxTime - mMinTime) + mMinTime;
+
+    // apply each channel
+    for (auto& channel : mRotationChannels)
+    {
+        channel.apply(asset, mSamplers[channel.mSampler], time);
+    }
+
+    for (auto& channel : mTranslationChannels)
+    {
+        channel.apply(asset, mSamplers[channel.mSampler], time);
+    }
+};
+
+
+void Animation::Sampler::allocateGLResources(Asset& asset)
+{
+    Accessor& accessor = asset.mAccessors[mInput];
+    mMinTime = accessor.mMin[0];
+    mMaxTime = accessor.mMax[0];
+
+    mFrameTimes.resize(accessor.mCount);
+
+    LLStrider<F32> frame_times = mFrameTimes.data();
+    copy(asset, accessor, frame_times);
+}
+
+void Animation::Sampler::getFrameInfo(Asset& asset, F32 time, U32& frameIndex, F32& t)
+{
+    if (time < mMinTime)
+    {
+        frameIndex = 0;
+        t = 0.0f;
+        return;
+    }
+
+    if (mFrameTimes.size() > 1)
+    {
+        if (time > mMaxTime)
+        {
+            frameIndex = mFrameTimes.size() - 2;
+            t = 1.0f;
+            return;
+        }
+
+        frameIndex = mFrameTimes.size() - 2;
+        t = 1.f;
+
+        for (U32 i = 0; i < mFrameTimes.size() - 1; i++)
+        {
+            if (time >= mFrameTimes[i] && time < mFrameTimes[i + 1])
+            {
+                frameIndex = i;
+                t = (time - mFrameTimes[i]) / (mFrameTimes[i + 1] - mFrameTimes[i]);
+                return;
+            }
+        }
+    }
+    else
+    {
+        frameIndex = 0;
+        t = 0.0f;
+    }
+}
+
+void Animation::RotationChannel::allocateGLResources(Asset& asset, Animation::Sampler& sampler)
+{
+    Accessor& accessor = asset.mAccessors[sampler.mOutput];
+
+    copy(asset, accessor, mRotations);
+}
+
+void Animation::RotationChannel::apply(Asset& asset, Sampler& sampler, F32 time)
+{
+    U32 frameIndex;
+    F32 t;
+
+    Node& node = asset.mNodes[mTarget.mNode];
+
+    sampler.getFrameInfo(asset, time, frameIndex, t);
+
+    if (sampler.mFrameTimes.size() == 1)
+    {
+        node.setRotation(mRotations[0]);
+    }
+    else
+    {
+        // interpolate
+        LLQuaternion q0(mRotations[frameIndex].get_value());
+        LLQuaternion q1(mRotations[frameIndex + 1].get_value());
+
+        LLQuaternion qf = slerp(t, q0, q1);
+
+        qf.normalize();
+        node.setRotation(glh::quaternionf(qf.mQ));
+    }
+}
+
+void Animation::TranslationChannel::allocateGLResources(Asset& asset, Animation::Sampler& sampler)
+{
+    Accessor& accessor = asset.mAccessors[sampler.mOutput];
+
+    copy(asset, accessor, mTranslations);
+}
+
+void Animation::TranslationChannel::apply(Asset& asset, Sampler& sampler, F32 time)
+{
+    U32 frameIndex;
+    F32 t;
+
+    Node& node = asset.mNodes[mTarget.mNode];
+
+    sampler.getFrameInfo(asset, time, frameIndex, t);
+
+    if (sampler.mFrameTimes.size() == 1)
+    {
+        node.setTranslation(mTranslations[0]);
+    }
+    else
+    {
+        // interpolate
+        const glh::vec3f& v0 = mTranslations[frameIndex];
+        const glh::vec3f& v1 = mTranslations[frameIndex + 1];
+
+        glh::vec3f vf = v0 + t * (v1 - v0);
+
+        node.setTranslation(vf);
+    }
+}
+
+void Animation::ScaleChannel::allocateGLResources(Asset& asset, Animation::Sampler& sampler)
+{
+    Accessor& accessor = asset.mAccessors[sampler.mOutput];
+
+    copy(asset, accessor, mScales);
+}
+
+void Animation::ScaleChannel::apply(Asset& asset, Sampler& sampler, F32 time)
+{
+    U32 frameIndex;
+    F32 t;
+
+    Node& node = asset.mNodes[mTarget.mNode];
+
+    sampler.getFrameInfo(asset, time, frameIndex, t);
+
+    if (sampler.mFrameTimes.size() == 1)
+    {
+        node.setScale(mScales[0]);
+    }
+    else
+    {
+        // interpolate
+        const glh::vec3f& v0 = mScales[frameIndex];
+        const glh::vec3f& v1 = mScales[frameIndex + 1];
+
+        glh::vec3f vf = v0 + t * (v1 - v0);
+
+        node.setScale(vf);
+    }
+}
+
+const Animation& Animation::operator=(const tinygltf::Animation& src)
+{
+    mName = src.name;
+
+    mSamplers.resize(src.samplers.size());
+    for (U32 i = 0; i < src.samplers.size(); ++i)
+    {
+        mSamplers[i] = src.samplers[i];
+    }
+
+    for (U32 i = 0; i < src.channels.size(); ++i)
+    {
+        if (src.channels[i].target_path == "rotation")
+        {
+            mRotationChannels.push_back(RotationChannel());
+            mRotationChannels.back() = src.channels[i];
+        }
+
+        if (src.channels[i].target_path == "translation")
+        {
+            mTranslationChannels.push_back(TranslationChannel());
+            mTranslationChannels.back() = src.channels[i];
+        }
+
+        if (src.channels[i].target_path == "scale")
+        {
+            mScaleChannels.push_back(ScaleChannel());
+            mScaleChannels.back() = src.channels[i];
+        }
+    }
+
+    return *this;
+}
+
+void Skin::allocateGLResources(Asset& asset)
+{
+    if (mInverseBindMatrices != INVALID_INDEX)
+    {
+        Accessor& accessor = asset.mAccessors[mInverseBindMatrices];
+        copy(asset, accessor, mInverseBindMatricesData);
+    }
+}
+
+const Skin& Skin::operator=(const tinygltf::Skin& src)
+{
+    mName = src.name;
+    mSkeleton = src.skeleton;
+    mInverseBindMatrices = src.inverseBindMatrices;
+    mJoints = src.joints;
+
+    return *this;
+}
+