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[Olympus] Enhance morpher: add CPU morpher (#7)
- add cpu morpher which supports more than 4 active targets - add common interface for morphers - change Animator to allow swapping out the stock MorphHelper for the new CPUMorpher - change Animator to allow morphers to be managed externally
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| /* | ||
| * Copyright (C) 2021 The Android Open Source Project | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
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| #include "CPUMorpher.h" | ||
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| #include <filament/BufferObject.h> | ||
| #include <filament/RenderableManager.h> | ||
| #include <filament/VertexBuffer.h> | ||
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| #include "GltfHelpers.h" | ||
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| using namespace filament; | ||
| using namespace filament::math; | ||
| using namespace utils; | ||
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| namespace gltfio { | ||
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| static const auto FREE_CALLBACK = [](void* mem, size_t, void*) { free(mem); }; | ||
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| CPUMorpher::CPUMorpher(FFilamentAsset* asset, FFilamentInstance* instance) : mAsset(asset) { | ||
| NodeMap& sourceNodes = asset->mNodeMap; | ||
| for (auto pair : sourceNodes) { | ||
| cgltf_node const* node = pair.first; | ||
| cgltf_mesh const* mesh = node->mesh; | ||
| if (mesh) { | ||
| cgltf_primitive const* prims = mesh->primitives; | ||
| for (cgltf_size pi = 0, count = mesh->primitives_count; pi < count; ++pi) { | ||
| if (mesh->primitives[pi].targets_count > 0) { | ||
| addPrimitive(mesh, pi, &mMorphTable[pair.second]); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| CPUMorpher::~CPUMorpher() { | ||
| auto engine = mAsset->mEngine; | ||
| for (auto& entry : mMorphTable) { | ||
| for (auto& prim : entry.second.primitives) { | ||
| if (prim.morphBuffer1) engine->destroy(prim.morphBuffer1); | ||
| if (prim.morphBuffer2) engine->destroy(prim.morphBuffer2); | ||
| } | ||
| } | ||
| } | ||
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| void CPUMorpher::applyWeights(Entity entity, float const* weights, size_t count) noexcept { | ||
| auto& engine = *mAsset->mEngine; | ||
| auto renderableManager = &engine.getRenderableManager(); | ||
| auto renderable = renderableManager->getInstance(entity); | ||
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| for (auto& prim : mMorphTable[entity].primitives) { | ||
| if (prim.targets.size() < count) { | ||
| continue; | ||
| } | ||
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| size_t size = prim.floatsCount * sizeof(float); | ||
| float* data = (float*) malloc(size); | ||
| memset(data, 0, size); | ||
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| for (size_t index = 0; index < count; index ++) { | ||
| const float w = weights[index]; | ||
| if (w < 0.0001f) continue; | ||
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| const GltfTarget& target = prim.targets[index]; | ||
| cgltf_size dim = cgltf_num_components(target.type); | ||
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| for (size_t i = 0; i < target.indices.size(); ++i) { | ||
| uint16_t index = target.indices[i]; | ||
| for (size_t j = 0; j < dim; ++j) { | ||
| data[index * dim + j] += w * target.values[i * dim + j]; | ||
| } | ||
| } | ||
| } | ||
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| VertexBuffer* vb = prim.vertexBuffer; | ||
| if (!prim.morphBuffer1) { | ||
| prim.morphBuffer1 = BufferObject::Builder().size(size).build(engine); | ||
| } | ||
| if (!prim.morphBuffer2 && count >= 2) { | ||
| // This is for dealing with a bug in filament shaders where empty normals are not | ||
| // handled correctly. | ||
| // | ||
| // filament shaders deal with tangent frame quaternions instead of normal vectors. | ||
| // But in case of missing inputs, we get a invalid quaternion (0, 0, 0, 0) instead of | ||
| // a identity quaterion. This leads to the normals being morphed even no inputs are | ||
| // given. | ||
| // | ||
| // To fix this, we put a empty morph target at slot 2 and give it a weight of -1. | ||
| // This won't affect the vertex positions but will cancel out the normal values. | ||
| // | ||
| // Note that for this to work, at least two morph targets are required. | ||
| float* data2 = (float*) malloc(size); | ||
| memset(data2, 0, size); | ||
| VertexBuffer::BufferDescriptor bd2(data2, size, FREE_CALLBACK); | ||
| prim.morphBuffer2 = BufferObject::Builder().size(size).build(engine); | ||
| prim.morphBuffer2->setBuffer(engine, std::move(bd2)); | ||
| vb->setBufferObjectAt(engine, prim.baseSlot+1, prim.morphBuffer2); | ||
| } | ||
| VertexBuffer::BufferDescriptor bd(data, size, FREE_CALLBACK); | ||
| prim.morphBuffer1->setBuffer(engine, std::move(bd)); | ||
| vb->setBufferObjectAt(engine, prim.baseSlot, prim.morphBuffer1); | ||
| } | ||
| renderableManager->setMorphWeights(renderable, {1, -1, 0, 0}); | ||
| } | ||
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| void CPUMorpher::addPrimitive(cgltf_mesh const* mesh, int primitiveIndex, TableEntry* entry) { | ||
| auto& engine = *mAsset->mEngine; | ||
| const cgltf_primitive& cgltf_prim = mesh->primitives[primitiveIndex]; | ||
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| int posIndex = findPositionAttribute(cgltf_prim); | ||
| if (posIndex < 0) return; | ||
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| VertexBuffer* vertexBuffer = mAsset->mMeshCache.at(mesh)[primitiveIndex].vertices; | ||
| int slot = determineBaseSlot(cgltf_prim); | ||
| entry->primitives.push_back({ vertexBuffer, slot }); | ||
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| auto& primitive = entry->primitives.back(); | ||
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| cgltf_attribute& positionAttribute = cgltf_prim.attributes[posIndex]; | ||
| size_t dim = cgltf_num_components(positionAttribute.data->type); | ||
| primitive.floatsCount = positionAttribute.data->count * dim; | ||
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| std::vector<GltfTarget>& targets = primitive.targets; | ||
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| for (int targetIndex = 0; targetIndex < cgltf_prim.targets_count; targetIndex++) { | ||
| const cgltf_morph_target& morphTarget = cgltf_prim.targets[targetIndex]; | ||
| for (cgltf_size aindex = 0; aindex < morphTarget.attributes_count; aindex++) { | ||
| const cgltf_attribute& attribute = morphTarget.attributes[aindex]; | ||
| const cgltf_accessor* accessor = attribute.data; | ||
| const cgltf_attribute_type atype = attribute.type; | ||
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| // only works for morphing of positions for now | ||
| if (atype == cgltf_attribute_type_position) { | ||
| targets.push_back({targetIndex, atype, accessor->type}); | ||
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| // expect the morph target to use a sparse accessor | ||
| if (accessor->is_sparse) { | ||
| const cgltf_accessor_sparse& sparse = accessor->sparse; | ||
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| const uint8_t* index_data = cgltf_buffer_view_data(sparse.indices_buffer_view); | ||
| const uint8_t* reader_head = cgltf_buffer_view_data(sparse.values_buffer_view); | ||
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| index_data += sparse.indices_byte_offset; | ||
| reader_head += sparse.values_byte_offset; | ||
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| cgltf_size index_stride = cgltf_component_size(sparse.indices_component_type); | ||
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| cgltf_size floats_per_element = cgltf_num_components(accessor->type); | ||
| targets.back().indices.resize(sparse.count); | ||
| targets.back().values.resize(sparse.count * floats_per_element); | ||
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| for (cgltf_size reader_index = 0; reader_index < sparse.count; reader_index++) { | ||
| targets.back().indices[reader_index] = cgltf_component_read_index(index_data, | ||
| sparse.indices_component_type); | ||
| cgltf_element_read_float(reader_head, accessor->type, accessor->component_type, | ||
| accessor->normalized, | ||
| targets.back().values.data() + reader_index * floats_per_element, | ||
| floats_per_element); | ||
| index_data += index_stride; | ||
| reader_head += accessor->stride; | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| // trying to find the slot for the vertex position | ||
| int CPUMorpher::determineBaseSlot(const cgltf_primitive& prim) const { | ||
| int slot = 0; | ||
| bool hasNormals = false; | ||
| for (cgltf_size aindex = 0; aindex < prim.attributes_count; aindex++) { | ||
| const cgltf_attribute& attribute = prim.attributes[aindex]; | ||
| const int index = attribute.index; | ||
| const cgltf_attribute_type atype = attribute.type; | ||
| const cgltf_accessor* accessor = attribute.data; | ||
| if (atype == cgltf_attribute_type_tangent) { | ||
| continue; | ||
| } | ||
| if (atype == cgltf_attribute_type_normal) { | ||
| slot++; | ||
| hasNormals = true; | ||
| continue; | ||
| } | ||
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| // Filament supports two set of texcoords. But whether or not UV1 is actually used also | ||
| // depends on the material. | ||
| // Note this is a very specific fix that might not work in all cases. | ||
| if (atype == cgltf_attribute_type_texcoord && index > 0) { | ||
| bool hasUV1 = false; | ||
| cgltf_material* mat = prim.material; | ||
| if (mat->has_pbr_metallic_roughness) { | ||
| if (mat->pbr_metallic_roughness.base_color_texture.texcoord != 0) { | ||
| hasUV1 = true; | ||
| } | ||
| if (mat->pbr_metallic_roughness.metallic_roughness_texture.texcoord != 0) { | ||
| hasUV1 = true; | ||
| } | ||
| } | ||
| if (mat->normal_texture.texcoord != 0) hasUV1 = true; | ||
| if (mat->emissive_texture.texcoord != 0) hasUV1 = true; | ||
| if (mat->occlusion_texture.texcoord != 0) hasUV1 = true; | ||
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| if (hasUV1) slot++; | ||
| continue; | ||
| } | ||
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| slot++; | ||
| } | ||
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| // If the model has lighting but not normals, then a slot is used for generated flat normals. | ||
| if (prim.material && !prim.material->unlit && !hasNormals) { | ||
| slot++; | ||
| } | ||
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| return slot; | ||
| }; | ||
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| int CPUMorpher::findPositionAttribute(const cgltf_primitive& prim) const { | ||
| for (cgltf_size aindex = 0; aindex < prim.attributes_count; aindex++) { | ||
| if (prim.attributes[aindex].type == cgltf_attribute_type_position) { | ||
| return aindex; | ||
| } | ||
| } | ||
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| return -1; | ||
| }; | ||
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| } // namespace gltfio |
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