| | | 1 | | using System.Linq; |
| | | 2 | | using UnityEngine; |
| | | 3 | | using Object = UnityEngine.Object; |
| | | 4 | | |
| | | 5 | | namespace GPUSkinning |
| | | 6 | | { |
| | | 7 | | public interface IGPUSkinning |
| | | 8 | | { |
| | | 9 | | Renderer renderer { get; } |
| | | 10 | | void Update(); |
| | | 11 | | } |
| | | 12 | | |
| | | 13 | | public static class GPUSkinningUtils |
| | | 14 | | { |
| | | 15 | | /// <summary> |
| | | 16 | | /// This must be done once per SkinnedMeshRenderer before animating. |
| | | 17 | | /// </summary> |
| | | 18 | | /// <param name="skr"></param> |
| | | 19 | | public static void EncodeBindPosesIntoMesh(SkinnedMeshRenderer skr) |
| | | 20 | | { |
| | 1 | 21 | | Mesh sharedMesh = skr.sharedMesh; |
| | 1 | 22 | | int vertexCount = sharedMesh.vertexCount; |
| | 1 | 23 | | Vector4[] bone01data = new Vector4[vertexCount]; |
| | 1 | 24 | | Vector4[] bone23data = new Vector4[vertexCount]; |
| | | 25 | | |
| | 1 | 26 | | BoneWeight[] boneWeights = sharedMesh.boneWeights; |
| | | 27 | | |
| | 2096 | 28 | | for ( int i = 0; i < vertexCount; i ++ ) |
| | | 29 | | { |
| | 1047 | 30 | | BoneWeight boneWeight = boneWeights[i]; |
| | 1047 | 31 | | bone01data[i].x = boneWeight.boneIndex0; |
| | 1047 | 32 | | bone01data[i].y = boneWeight.weight0; |
| | 1047 | 33 | | bone01data[i].z = boneWeight.boneIndex1; |
| | 1047 | 34 | | bone01data[i].w = boneWeight.weight1; |
| | | 35 | | |
| | 1047 | 36 | | bone23data[i].x = boneWeight.boneIndex2; |
| | 1047 | 37 | | bone23data[i].y = boneWeight.weight2; |
| | 1047 | 38 | | bone23data[i].z = boneWeight.boneIndex3; |
| | 1047 | 39 | | bone23data[i].w = boneWeight.weight3; |
| | | 40 | | } |
| | | 41 | | |
| | 1 | 42 | | skr.sharedMesh.tangents = bone01data; |
| | 1 | 43 | | skr.sharedMesh.SetUVs(1, bone23data); |
| | 1 | 44 | | } |
| | | 45 | | } |
| | | 46 | | |
| | | 47 | | public class SimpleGPUSkinning : IGPUSkinning |
| | | 48 | | { |
| | | 49 | | private static readonly int BONE_MATRICES = Shader.PropertyToID("_Matrices"); |
| | | 50 | | private static readonly int BIND_POSES = Shader.PropertyToID("_BindPoses"); |
| | | 51 | | private static readonly int RENDERER_WORLD_INVERSE = Shader.PropertyToID("_WorldInverse"); |
| | | 52 | | |
| | | 53 | | public Renderer renderer { get; } |
| | | 54 | | |
| | | 55 | | private Transform[] bones; |
| | | 56 | | private Matrix4x4[] boneMatrices; |
| | | 57 | | |
| | | 58 | | public SimpleGPUSkinning (SkinnedMeshRenderer skr, bool encodeBindPoses = true) |
| | | 59 | | { |
| | | 60 | | if ( encodeBindPoses ) |
| | | 61 | | GPUSkinningUtils.EncodeBindPosesIntoMesh(skr); |
| | | 62 | | |
| | | 63 | | boneMatrices = new Matrix4x4[skr.bones.Length]; |
| | | 64 | | |
| | | 65 | | GameObject go = skr.gameObject; |
| | | 66 | | |
| | | 67 | | if (!go.TryGetComponent(out MeshFilter meshFilter)) |
| | | 68 | | meshFilter = go.AddComponent<MeshFilter>(); |
| | | 69 | | |
| | | 70 | | meshFilter.sharedMesh = skr.sharedMesh; |
| | | 71 | | |
| | | 72 | | renderer = go.AddComponent<MeshRenderer>(); |
| | | 73 | | renderer.sharedMaterials = skr.sharedMaterials; |
| | | 74 | | foreach (Material material in renderer.sharedMaterials) |
| | | 75 | | { |
| | | 76 | | material.SetMatrixArray(BIND_POSES, skr.sharedMesh.bindposes.ToArray()); |
| | | 77 | | material.EnableKeyword("_GPU_SKINNING"); |
| | | 78 | | } |
| | | 79 | | |
| | | 80 | | bones = skr.bones; |
| | | 81 | | meshFilter.mesh.bounds = new Bounds(new Vector3(0, 2, 0), new Vector3(1, 3, 1)); |
| | | 82 | | UpdateMatrices(); |
| | | 83 | | |
| | | 84 | | Object.Destroy(skr); |
| | | 85 | | } |
| | | 86 | | |
| | | 87 | | public void Update() |
| | | 88 | | { |
| | | 89 | | if (!renderer.isVisible) |
| | | 90 | | return; |
| | | 91 | | |
| | | 92 | | UpdateMatrices(); |
| | | 93 | | } |
| | | 94 | | |
| | | 95 | | private void UpdateMatrices() |
| | | 96 | | { |
| | | 97 | | int bonesLength = bones.Length; |
| | | 98 | | for (int i = 0; i < bonesLength; i++) |
| | | 99 | | { |
| | | 100 | | Transform bone = bones[i]; |
| | | 101 | | boneMatrices[i] = bone.localToWorldMatrix; |
| | | 102 | | } |
| | | 103 | | |
| | | 104 | | for (int index = 0; index < renderer.sharedMaterials.Length; index++) |
| | | 105 | | { |
| | | 106 | | Material material = renderer.sharedMaterials[index]; |
| | | 107 | | material.SetMatrix(RENDERER_WORLD_INVERSE, renderer.transform.worldToLocalMatrix); |
| | | 108 | | material.SetMatrixArray(BONE_MATRICES, boneMatrices); |
| | | 109 | | } |
| | | 110 | | } |
| | | 111 | | } |
| | | 112 | | } |