1 files changed, 162 insertions, 0 deletions
diff --git a/indra/newview/gltf/animation.h b/indra/newview/gltf/animation.h
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+++ b/indra/newview/gltf/animation.h
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+#pragma once
+
+/**
+ * @file animation.h
+ * @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 "accessor.h"
+// LL GLTF Implementation
+namespace LL
+{
+    namespace GLTF
+    {
+        class Asset;
+
+        class Animation
+        {
+        public:
+            class Sampler
+            {
+            public:
+                std::vector<F32> mFrameTimes;
+
+                F32 mMinTime = -FLT_MAX;
+                F32 mMaxTime = FLT_MAX;
+
+                S32 mInput = INVALID_INDEX;
+                S32 mOutput = INVALID_INDEX;
+                std::string mInterpolation;
+
+                bool prep(Asset& asset);
+
+                void serialize(boost::json::object& dst) const;
+                const Sampler& operator=(const Value& value);
+
+                // get the frame index and time for the specified time
+                // asset -- the asset to reference for Accessors
+                // time -- the animation time to get the frame info for
+                // frameIndex -- index of the closest frame that precedes the specified time
+                // t - interpolant value between the frameIndex and the next frame
+                void getFrameInfo(Asset& asset, F32 time, U32& frameIndex, F32& t);
+            };
+
+            class Channel
+            {
+            public:
+                class Target
+                {
+                public:
+                    S32 mNode = INVALID_INDEX;
+                    std::string mPath;
+
+                    bool operator==(const Target& other) const;
+                    bool operator!=(const Target& other) const;
+
+                    void serialize(boost::json::object& dst) const;
+                    const Target& operator=(const Value& value);
+                };
+
+                S32 mSampler = INVALID_INDEX;
+                Target mTarget;
+
+                void serialize(boost::json::object& dst) const;
+                const Channel& operator=(const Value& value);
+            };
+
+            class RotationChannel : public Channel
+            {
+            public:
+                RotationChannel() = default;
+                RotationChannel(const Channel& channel) : Channel(channel) {}
+
+                std::vector<quat> mRotations;
+
+                // prepare data needed for rendering
+                // asset -- asset to reference for Accessors
+                // sampler -- Sampler associated with this channel
+                bool prep(Asset& asset, Sampler& sampler);
+
+                void apply(Asset& asset, Sampler& sampler, F32 time);
+            };
+
+            class TranslationChannel : public Channel
+            {
+            public:
+                TranslationChannel() = default;
+                TranslationChannel(const Channel& channel) : Channel(channel) {}
+
+                std::vector<vec3> mTranslations;
+
+                // prepare data needed for rendering
+                // asset -- asset to reference for Accessors
+                // sampler -- Sampler associated with this channel
+                bool prep(Asset& asset, Sampler& sampler);
+
+                void apply(Asset& asset, Sampler& sampler, F32 time);
+            };
+
+            class ScaleChannel : public Channel
+            {
+            public:
+                ScaleChannel() = default;
+                ScaleChannel(const Channel& channel) : Channel(channel) {}
+
+                std::vector<vec3> mScales;
+
+                // prepare data needed for rendering
+                // asset -- asset to reference for Accessors
+                // sampler -- Sampler associated with this channel
+                bool prep(Asset& asset, Sampler& sampler);
+
+                void apply(Asset& asset, Sampler& sampler, F32 time);
+            };
+
+            std::string mName;
+            std::vector<Sampler> mSamplers;
+
+            // min/max time values for all samplers combined
+            F32 mMinTime = 0.f;
+            F32 mMaxTime = 0.f;
+
+            // current time of the animation
+            F32 mTime = 0.f;
+
+            std::vector<RotationChannel> mRotationChannels;
+            std::vector<TranslationChannel> mTranslationChannels;
+            std::vector<ScaleChannel> mScaleChannels;
+
+            void serialize(boost::json::object& dst) const;
+            const Animation& operator=(const Value& value);
+
+            bool prep(Asset& asset);
+
+            void update(Asset& asset, float dt);
+
+            // apply this animation at the specified time
+            void apply(Asset& asset, F32 time);
+        };
+
+    }
+}