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This adds a feature to `build_actor` to support importing skeletons and animations from .glb files. Multiple animations are handled and will use the name in the GLB. The default `viewer` process will end up playing back the first animation. There are a few limitations: - You can only have around 100 bones. It is technically possibly to have slightly more, but certain animations may fail to compress when there are more than ~100 bones. - Currently, all animations have 60 keyframes per second. This is a higher quality than what is normally used. If animation size becomes problematic, we could make this customizable somehow. - There is no support for the `align` bone. --------- Co-authored-by: water111 <awaterford1111445@gmail.com>
625 lines
22 KiB
C++
625 lines
22 KiB
C++
#include "gltf_util.h"
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#include "common/log/log.h"
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namespace gltf_util {
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/*!
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* Convert a GLTF position buffer or similar to std::vector<Vec3f>
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*/
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std::vector<math::Vector3f> extract_vec3f(const u8* data, u32 count, u32 stride) {
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std::vector<math::Vector3f> result;
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result.reserve(count);
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for (u32 i = 0; i < count; i++) {
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memcpy(&result.emplace_back(), data, sizeof(math::Vector3f));
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data += stride;
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}
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return result;
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}
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std::vector<math::Vector2f> extract_vec2f(const u8* data, u32 count, u32 stride) {
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std::vector<math::Vector2f> result;
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result.reserve(count);
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for (u32 i = 0; i < count; i++) {
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memcpy(&result.emplace_back(), data, sizeof(math::Vector2f));
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data += stride;
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}
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return result;
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}
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/*!
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* Convert a GLTF color buffer (float format) to u8 colors.
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*/
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std::vector<math::Vector<u8, 4>> extract_color_from_vec4_float(const u8* data,
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u32 count,
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u32 stride) {
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std::vector<math::Vector<u8, 4>> result;
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result.reserve(count);
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for (u32 i = 0; i < count; i++) {
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math::Vector<float, 4> temp;
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memcpy(&temp, data, sizeof(math::Vector<float, 4>));
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data += stride;
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result.emplace_back(temp.x() * 255, temp.y() * 255, temp.z() * 255, temp.w() * 255);
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}
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return result;
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}
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std::vector<math::Vector<u8, 4>> extract_color_from_vec3_float(const u8* data,
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u32 count,
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u32 stride) {
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std::vector<math::Vector<u8, 4>> result;
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result.reserve(count);
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for (u32 i = 0; i < count; i++) {
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math::Vector<float, 3> temp;
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memcpy(&temp, data, sizeof(math::Vector<float, 3>));
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data += stride;
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result.emplace_back(temp.x() * 255, temp.y() * 255, temp.z() * 255, 255);
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}
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return result;
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}
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/*!
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* Convert a GLTF color buffer (u16 format) to u8 colors.
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*/
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std::vector<math::Vector<u8, 4>> extract_color_from_vec4_u16(const u8* data,
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u32 count,
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u32 stride) {
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std::vector<math::Vector<u8, 4>> result;
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result.reserve(count);
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for (u32 i = 0; i < count; i++) {
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math::Vector<u16, 4> temp;
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memcpy(&temp, data, sizeof(math::Vector<u16, 4>));
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data += stride;
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result.emplace_back(temp.x() >> 8, temp.y() >> 8, temp.z() >> 8, temp.w() >> 8);
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}
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return result;
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}
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std::vector<math::Vector<u8, 4>> extract_color_from_vec4_u8(const u8* data, u32 count, u32 stride) {
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std::vector<math::Vector<u8, 4>> result;
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result.reserve(count);
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for (u32 i = 0; i < count; i++) {
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result.push_back(math::Vector<u8, 4>(data[0], data[1], data[2], data[3]));
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data += stride;
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}
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return result;
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}
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/*!
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* Convert a GLTF index buffer
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*/
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std::vector<u32> gltf_index_buffer(const tinygltf::Model& model,
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int indices_idx,
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u32 index_offset) {
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const auto& indices_accessor = model.accessors[indices_idx];
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const auto& buffer_view = model.bufferViews[indices_accessor.bufferView];
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const auto& buffer = model.buffers[buffer_view.buffer];
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const auto data_ptr = buffer.data.data() + buffer_view.byteOffset + indices_accessor.byteOffset;
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const auto stride = indices_accessor.ByteStride(buffer_view);
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const auto count = indices_accessor.count;
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switch (indices_accessor.componentType) {
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case TINYGLTF_COMPONENT_TYPE_BYTE:
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return index_list_to_u32<s8>(data_ptr, count, index_offset, stride);
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case TINYGLTF_COMPONENT_TYPE_UNSIGNED_BYTE:
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return index_list_to_u32<u8>(data_ptr, count, index_offset, stride);
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case TINYGLTF_COMPONENT_TYPE_SHORT:
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return index_list_to_u32<s16>(data_ptr, count, index_offset, stride);
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case TINYGLTF_COMPONENT_TYPE_UNSIGNED_SHORT:
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return index_list_to_u32<u16>(data_ptr, count, index_offset, stride);
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case TINYGLTF_COMPONENT_TYPE_INT:
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return index_list_to_u32<s32>(data_ptr, count, index_offset, stride);
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case TINYGLTF_COMPONENT_TYPE_UNSIGNED_INT:
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return index_list_to_u32<u32>(data_ptr, count, index_offset, stride);
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default:
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ASSERT_MSG(false, "unsupported component type");
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}
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}
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std::vector<math::Matrix4f> extract_mat4(const tinygltf::Model& model, int accessor_idx) {
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const auto& accessor = model.accessors[accessor_idx];
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const auto& buffer_view = model.bufferViews[accessor.bufferView];
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const auto& buffer = model.buffers[buffer_view.buffer];
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const u8* data_ptr = buffer.data.data() + buffer_view.byteOffset + accessor.byteOffset;
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const auto stride = accessor.ByteStride(buffer_view);
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const auto count = accessor.count;
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// ASSERT(buffer_view.target == TINYGLTF_TARGET_ARRAY_BUFFER); // ??
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ASSERT(accessor.componentType == TINYGLTF_COMPONENT_TYPE_FLOAT);
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ASSERT(accessor.type == TINYGLTF_TYPE_MAT4);
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std::vector<math::Matrix4f> result(accessor.count);
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for (size_t x = 0; x < count; x++) {
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for (int i = 0; i < 4; i++) {
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for (int j = 0; j < 4; j++) {
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memcpy(&result[x](j, i), data_ptr + sizeof(float) * (i * 4 + j), sizeof(float));
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}
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}
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data_ptr += stride;
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}
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return result;
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}
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JointsAndWeights convert_per_vertex_data(const math::Vector4f& weights,
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const math::Vector<u8, 4>& joints) {
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int discard_idx = -1;
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float discard_weight = 100;
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for (int i = 0; i < 4; i++) {
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if (weights[i] < discard_weight) {
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discard_idx = i;
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discard_weight = weights[i];
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}
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}
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JointsAndWeights ret;
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int dst = 0;
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float sum = 0;
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for (int src = 0; src < 4; src++) {
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if (src == discard_idx) {
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continue;
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}
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// this +1 is to account for align not existing in the gltf.
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ret.joints[dst] = joints[src] + 2;
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ret.weights[dst] = weights[src];
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sum += ret.weights[dst];
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dst++;
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}
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ret.weights /= sum;
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return ret;
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}
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std::vector<JointsAndWeights> extract_and_flatten_joints_and_weights(
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const tinygltf::Model& model,
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const tinygltf::Primitive& prim) {
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auto weights =
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extract_vec<float, 4>(model, prim.attributes.at("WEIGHTS_0"), TINYGLTF_COMPONENT_TYPE_FLOAT);
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auto joints = extract_vec<u8, 4>(model, prim.attributes.at("JOINTS_0"),
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TINYGLTF_COMPONENT_TYPE_UNSIGNED_BYTE);
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std::vector<JointsAndWeights> ret;
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ASSERT(weights.size() == joints.size());
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for (size_t i = 0; i < weights.size(); i++) {
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ret.push_back(convert_per_vertex_data(weights[i], joints[i]));
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}
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return ret;
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}
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/*!
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* Extract positions, colors, and normals from a mesh.
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*/
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ExtractedVertices gltf_vertices(const tinygltf::Model& model,
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const std::map<std::string, int>& attributes,
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const math::Matrix4f& w_T_local,
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bool get_colors,
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bool get_normals,
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const std::string& debug_name) {
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std::vector<tfrag3::PreloadedVertex> result;
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std::vector<math::Vector<u8, 4>> vtx_colors;
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{
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const auto& position_attrib = attributes.find("POSITION");
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ASSERT_MSG(position_attrib != attributes.end(), "Did not find position attribute.");
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const auto attrib_accessor = model.accessors[position_attrib->second];
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const auto& buffer_view = model.bufferViews[attrib_accessor.bufferView];
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const auto& buffer = model.buffers[buffer_view.buffer];
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const auto data_ptr = buffer.data.data() + buffer_view.byteOffset + attrib_accessor.byteOffset;
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const auto byte_stride = attrib_accessor.ByteStride(buffer_view);
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const auto count = attrib_accessor.count;
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ASSERT_MSG(attrib_accessor.type == TINYGLTF_TYPE_VEC3, "POSITION wasn't vec3");
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ASSERT_MSG(attrib_accessor.componentType == TINYGLTF_COMPONENT_TYPE_FLOAT,
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"POSITION wasn't float");
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// for (auto& attrib : attributes) {
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// lg::print("attrib: {}\n", attrib.first);
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//}
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auto mesh_verts = extract_vec3f(data_ptr, count, byte_stride);
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result.reserve(mesh_verts.size());
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for (auto& vert : mesh_verts) {
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auto& new_vert = result.emplace_back();
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math::Vector4f v_in(vert.x(), vert.y(), vert.z(), 1);
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math::Vector4f v_w = w_T_local * v_in;
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new_vert.x = v_w.x() * 4096;
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new_vert.y = v_w.y() * 4096;
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new_vert.z = v_w.z() * 4096;
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}
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}
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if (get_colors) {
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const auto& color_attrib = attributes.find("COLOR_0");
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if (color_attrib == attributes.end()) {
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lg::error("Mesh {} didn't have any colors, using white", debug_name);
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for (size_t i = 0; i < result.size(); i++) {
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vtx_colors.emplace_back(0x80, 0x80, 0x80, 0xff);
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}
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} else {
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const auto attrib_accessor = model.accessors[color_attrib->second];
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const auto& buffer_view = model.bufferViews[attrib_accessor.bufferView];
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const auto& buffer = model.buffers[buffer_view.buffer];
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const auto data_ptr =
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buffer.data.data() + buffer_view.byteOffset + attrib_accessor.byteOffset;
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const auto byte_stride = attrib_accessor.ByteStride(buffer_view);
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const auto count = attrib_accessor.count;
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std::vector<math::Vector<u8, 4>> colors;
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switch (attrib_accessor.type) {
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case TINYGLTF_TYPE_VEC4:
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switch (attrib_accessor.componentType) {
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case TINYGLTF_COMPONENT_TYPE_FLOAT:
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colors = extract_color_from_vec4_float(data_ptr, count, byte_stride);
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break;
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case TINYGLTF_COMPONENT_TYPE_UNSIGNED_SHORT:
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colors = extract_color_from_vec4_u16(data_ptr, count, byte_stride);
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break;
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case TINYGLTF_COMPONENT_TYPE_UNSIGNED_BYTE:
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colors = extract_color_from_vec4_u8(data_ptr, count, byte_stride);
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break;
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default:
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lg::die("Unknown type for COLOR_0: {}", attrib_accessor.componentType);
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}
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break;
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case TINYGLTF_TYPE_VEC3:
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switch (attrib_accessor.componentType) {
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case TINYGLTF_COMPONENT_TYPE_FLOAT:
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colors = extract_color_from_vec3_float(data_ptr, count, byte_stride);
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break;
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default:
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lg::die("unkonwn component type for vec3 color {}", attrib_accessor.componentType);
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}
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break;
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default:
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lg::die("unknown attribute type for color {}", attrib_accessor.type);
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}
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vtx_colors.insert(vtx_colors.end(), colors.begin(), colors.end());
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}
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}
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bool got_texture = false;
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{
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const auto& texcoord_attrib = attributes.find("TEXCOORD_0");
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if (texcoord_attrib != attributes.end()) {
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const auto attrib_accessor = model.accessors[texcoord_attrib->second];
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const auto& buffer_view = model.bufferViews[attrib_accessor.bufferView];
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const auto& buffer = model.buffers[buffer_view.buffer];
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const auto data_ptr =
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buffer.data.data() + buffer_view.byteOffset + attrib_accessor.byteOffset;
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const auto byte_stride = attrib_accessor.ByteStride(buffer_view);
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const auto count = attrib_accessor.count;
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ASSERT_MSG(attrib_accessor.type == TINYGLTF_TYPE_VEC2, "TEXCOORD wasn't vec2");
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ASSERT_MSG(attrib_accessor.componentType == TINYGLTF_COMPONENT_TYPE_FLOAT,
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"TEXCOORD wasn't float");
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auto mesh_verts = extract_vec2f(data_ptr, count, byte_stride);
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ASSERT(mesh_verts.size() == result.size());
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got_texture = true;
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for (size_t i = 0; i < mesh_verts.size(); i++) {
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result[i].s = mesh_verts[i].x();
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result[i].t = mesh_verts[i].y();
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}
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} else {
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if (!get_normals) {
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// don't warn if we're just getting collision
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lg::warn("No texcoord attribute for mesh: {}", debug_name);
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}
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}
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}
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std::vector<math::Vector3f> normals;
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if (get_normals) {
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const auto& normal_attrib = attributes.find("NORMAL");
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if (normal_attrib != attributes.end()) {
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const auto attrib_accessor = model.accessors[normal_attrib->second];
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const auto& buffer_view = model.bufferViews[attrib_accessor.bufferView];
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const auto& buffer = model.buffers[buffer_view.buffer];
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const auto data_ptr =
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buffer.data.data() + buffer_view.byteOffset + attrib_accessor.byteOffset;
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const auto byte_stride = attrib_accessor.ByteStride(buffer_view);
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const auto count = attrib_accessor.count;
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ASSERT_MSG(attrib_accessor.type == TINYGLTF_TYPE_VEC3, "NORMAL wasn't vec3");
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ASSERT_MSG(attrib_accessor.componentType == TINYGLTF_COMPONENT_TYPE_FLOAT,
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"NORMAL wasn't float");
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normals = extract_vec3f(data_ptr, count, byte_stride);
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for (auto& nrm : normals) {
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math::Vector4f nrm4(nrm.x(), nrm.y(), nrm.z(), 0.f);
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nrm = (w_T_local * nrm4).xyz();
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}
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ASSERT(normals.size() == result.size());
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} else {
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lg::error("No NORMAL attribute for mesh: {}", debug_name);
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}
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}
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for (auto& v : result) {
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v.color_index = 0;
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if (!got_texture) {
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v.s = 0;
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v.t = 0;
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}
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}
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// TODO: other properties
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return {result, vtx_colors, normals};
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}
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DrawMode make_default_draw_mode() {
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DrawMode mode;
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mode.set_depth_write_enable(true);
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mode.set_depth_test(GsTest::ZTest::GEQUAL);
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mode.set_alpha_blend(DrawMode::AlphaBlend::DISABLED);
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mode.set_aref(0);
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mode.set_alpha_fail(GsTest::AlphaFail::KEEP);
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mode.set_clamp_s_enable(false);
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mode.set_clamp_t_enable(false);
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mode.disable_filt(); // for checkerboard...
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mode.enable_tcc(); // ?
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mode.disable_at();
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mode.enable_zt();
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mode.disable_ab();
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mode.disable_decal();
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mode.enable_fog();
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return mode;
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}
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int texture_pool_debug_checker(TexturePool* pool) {
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const auto& existing = pool->textures_by_name.find("DEBUG_CHECKERBOARD");
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if (existing == pool->textures_by_name.end()) {
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size_t idx = pool->textures_by_idx.size();
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pool->textures_by_name["DEBUG_CHECKERBOARD"] = idx;
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auto& tex = pool->textures_by_idx.emplace_back();
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tex.w = 16;
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tex.h = 16;
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tex.debug_name = "DEBUG_CHECKERBOARD";
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tex.debug_tpage_name = "DEBUG";
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tex.load_to_pool = false;
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tex.combo_id = 0; // doesn't matter, not a pool tex
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tex.data.resize(16 * 16);
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u32 c0 = 0xa0303030;
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u32 c1 = 0xa0e0e0e0;
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for (int i = 0; i < 16; i++) {
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for (int j = 0; j < 16; j++) {
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tex.data[i * 16 + j] = (((i / 4) & 1) ^ ((j / 4) & 1)) ? c1 : c0;
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}
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}
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return idx;
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} else {
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return existing->second;
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}
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}
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int texture_pool_add_texture(TexturePool* pool, const tinygltf::Image& tex) {
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const auto& existing = pool->textures_by_name.find(tex.name);
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if (existing != pool->textures_by_name.end()) {
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lg::info("Reusing image: {}", tex.name);
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return existing->second;
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} else {
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lg::info("adding new texture: {}, size {} kB", tex.name, tex.width * tex.height * 4 / 1024);
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}
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ASSERT(tex.bits == 8);
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ASSERT(tex.component == 4);
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ASSERT(tex.pixel_type == TINYGLTF_TEXTURE_TYPE_UNSIGNED_BYTE);
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size_t idx = pool->textures_by_idx.size();
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pool->textures_by_name[tex.name] = idx;
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auto& tt = pool->textures_by_idx.emplace_back();
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tt.w = tex.width;
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tt.h = tex.height;
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tt.debug_name = tex.name;
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tt.debug_tpage_name = "custom-level";
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tt.load_to_pool = false;
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tt.combo_id = 0; // doesn't matter, not a pool tex
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tt.data.resize(tt.w * tt.h);
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ASSERT(tex.image.size() >= tt.data.size());
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memcpy(tt.data.data(), tex.image.data(), tt.data.size() * 4);
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return idx;
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}
|
|
|
|
math::Matrix4f affine_translation(const math::Vector3f& translation) {
|
|
math::Matrix4f result = math::Matrix4f::identity();
|
|
result(0, 3) = translation[0];
|
|
result(1, 3) = translation[1];
|
|
result(2, 3) = translation[2];
|
|
result(3, 3) = 1;
|
|
return result;
|
|
}
|
|
|
|
math::Matrix4f affine_scale(const math::Vector3f& scale) {
|
|
math::Matrix4f result = math::Matrix4f::zero();
|
|
result(0, 0) = scale[0];
|
|
result(1, 1) = scale[1];
|
|
result(2, 2) = scale[2];
|
|
result(3, 3) = 1;
|
|
return result;
|
|
}
|
|
|
|
math::Matrix4f affine_rot_qxyzw(const math::Vector4f& quat) {
|
|
math::Matrix4f result = math::Matrix4f::zero();
|
|
result(3, 3) = 1;
|
|
result(0, 0) = 1.0 - 2.0 * (quat.y() * quat.y() + quat.z() * quat.z());
|
|
result(0, 1) = 2.0 * (quat.x() * quat.y() - quat.z() * quat.w());
|
|
result(0, 2) = 2.0 * (quat.x() * quat.z() + quat.y() * quat.w());
|
|
result(1, 0) = 2.0 * (quat.x() * quat.y() + quat.z() * quat.w());
|
|
result(1, 1) = 1.0 - 2.0 * (quat.x() * quat.x() + quat.z() * quat.z());
|
|
result(1, 2) = 2.0 * (quat.y() * quat.z() - quat.x() * quat.w());
|
|
result(2, 0) = 2.0 * (quat.x() * quat.z() - quat.y() * quat.w());
|
|
result(2, 1) = 2.0 * (quat.y() * quat.z() + quat.x() * quat.w());
|
|
result(2, 2) = 1.0 - 2.0 * (quat.x() * quat.x() + quat.y() * quat.y());
|
|
return result;
|
|
}
|
|
|
|
math::Vector3f vector3f_from_gltf(const std::vector<double>& in) {
|
|
ASSERT(in.size() == 3);
|
|
return math::Vector3f{in[0], in[1], in[2]};
|
|
}
|
|
|
|
math::Vector4f vector4f_from_gltf(const std::vector<double>& in) {
|
|
ASSERT(in.size() == 4);
|
|
return math::Vector4f{in[0], in[1], in[2], in[3]};
|
|
}
|
|
|
|
math::Matrix4f matrix_from_trs(const math::Vector3f& trans,
|
|
const math::Vector4f& quat,
|
|
const math::Vector3f& scale) {
|
|
math::Matrix4f t = affine_translation(trans);
|
|
math::Matrix4f r = affine_rot_qxyzw(quat);
|
|
math::Matrix4f s = affine_scale(scale);
|
|
return t * r * s;
|
|
}
|
|
|
|
math::Matrix4f matrix_from_node(const tinygltf::Node& node) {
|
|
if (!node.matrix.empty()) {
|
|
math::Matrix4f result;
|
|
for (int i = 0; i < 16; i++) {
|
|
result.data()[i] = node.matrix[i];
|
|
}
|
|
return result;
|
|
} else {
|
|
// from trs
|
|
math::Matrix4f t, r, s;
|
|
if (!node.translation.empty()) {
|
|
t = affine_translation(vector3f_from_gltf(node.translation));
|
|
} else {
|
|
t = math::Matrix4f::identity();
|
|
}
|
|
|
|
if (!node.rotation.empty()) {
|
|
r = affine_rot_qxyzw(vector4f_from_gltf(node.rotation));
|
|
} else {
|
|
r = math::Matrix4f::identity();
|
|
}
|
|
|
|
if (!node.scale.empty()) {
|
|
s = affine_scale(vector3f_from_gltf(node.scale));
|
|
} else {
|
|
s = math::Matrix4f::identity();
|
|
}
|
|
|
|
return t * r * s;
|
|
}
|
|
}
|
|
|
|
/*!
|
|
* Recursively walk the tree of nodes, flatten, and compute w_T_node for each.
|
|
*/
|
|
void node_find_helper(const tinygltf::Model& model,
|
|
const math::Matrix4f& w_T_parent,
|
|
int node_idx,
|
|
std::vector<NodeWithTransform>* out) {
|
|
const auto& node = model.nodes.at(node_idx);
|
|
math::Matrix4f w_T_node = w_T_parent * matrix_from_node(node);
|
|
out->push_back({node_idx, w_T_node});
|
|
for (auto& child : node.children) {
|
|
node_find_helper(model, w_T_node, child, out);
|
|
}
|
|
}
|
|
|
|
std::vector<NodeWithTransform> flatten_nodes_from_all_scenes(const tinygltf::Model& model) {
|
|
std::vector<NodeWithTransform> out;
|
|
for (auto& scene : model.scenes) {
|
|
for (auto& nidx : scene.nodes) {
|
|
math::Matrix4f identity = math::Matrix4f::identity();
|
|
node_find_helper(model, identity, nidx, &out);
|
|
}
|
|
}
|
|
return out;
|
|
}
|
|
|
|
void dedup_vertices(const std::vector<tfrag3::PreloadedVertex>& vertices_in,
|
|
std::vector<tfrag3::PreloadedVertex>& vertices_out,
|
|
std::vector<u32>& old_to_new_out) {
|
|
ASSERT(vertices_out.empty());
|
|
ASSERT(old_to_new_out.empty());
|
|
old_to_new_out.resize(vertices_in.size(), -1);
|
|
|
|
std::unordered_map<tfrag3::PreloadedVertex, u32, tfrag3::PreloadedVertex::hash> vtx_to_new;
|
|
|
|
for (size_t in_idx = 0; in_idx < vertices_in.size(); in_idx++) {
|
|
auto& vtx = vertices_in[in_idx];
|
|
const auto& lookup = vtx_to_new.find(vtx);
|
|
if (lookup == vtx_to_new.end()) {
|
|
// first time seeing this one
|
|
size_t new_idx = vertices_out.size();
|
|
vertices_out.push_back(vtx);
|
|
old_to_new_out[in_idx] = new_idx;
|
|
vtx_to_new[vtx] = new_idx;
|
|
} else {
|
|
old_to_new_out[in_idx] = lookup->second;
|
|
}
|
|
}
|
|
}
|
|
|
|
DrawMode draw_mode_from_sampler(const tinygltf::Sampler& sampler) {
|
|
DrawMode mode = make_default_draw_mode();
|
|
if (sampler.magFilter == TINYGLTF_TEXTURE_FILTER_NEAREST) {
|
|
ASSERT(sampler.minFilter == TINYGLTF_TEXTURE_FILTER_NEAREST);
|
|
mode.set_filt_enable(false);
|
|
} else {
|
|
ASSERT(sampler.minFilter != TINYGLTF_TEXTURE_FILTER_NEAREST);
|
|
mode.set_filt_enable(true);
|
|
}
|
|
|
|
switch (sampler.wrapS) {
|
|
case TINYGLTF_TEXTURE_WRAP_CLAMP_TO_EDGE:
|
|
mode.set_clamp_s_enable(true);
|
|
break;
|
|
case TINYGLTF_TEXTURE_WRAP_REPEAT:
|
|
mode.set_clamp_s_enable(false);
|
|
break;
|
|
default:
|
|
ASSERT(false);
|
|
}
|
|
|
|
switch (sampler.wrapT) {
|
|
case TINYGLTF_TEXTURE_WRAP_CLAMP_TO_EDGE:
|
|
mode.set_clamp_t_enable(true);
|
|
break;
|
|
case TINYGLTF_TEXTURE_WRAP_REPEAT:
|
|
mode.set_clamp_t_enable(false);
|
|
break;
|
|
default:
|
|
ASSERT(false);
|
|
}
|
|
|
|
return mode;
|
|
}
|
|
|
|
std::optional<int> find_single_skin(const tinygltf::Model& model,
|
|
const std::vector<NodeWithTransform>& all_nodes) {
|
|
std::optional<int> skin_index;
|
|
for (const auto& n : all_nodes) {
|
|
const auto& node = model.nodes.at(n.node_idx);
|
|
if (node.skin >= 0) {
|
|
if (skin_index && *skin_index != node.skin) {
|
|
lg::die("GLTF contains multiple skins, but only one skin per actor is supported.");
|
|
}
|
|
skin_index = node.skin;
|
|
}
|
|
}
|
|
return skin_index;
|
|
}
|
|
|
|
std::vector<float> extract_floats(const tinygltf::Model& model, int accessor_idx) {
|
|
const auto& accessor = model.accessors[accessor_idx];
|
|
const auto& buffer_view = model.bufferViews[accessor.bufferView];
|
|
const auto& buffer = model.buffers[buffer_view.buffer];
|
|
const u8* data_ptr = buffer.data.data() + buffer_view.byteOffset + accessor.byteOffset;
|
|
const auto stride = accessor.ByteStride(buffer_view);
|
|
const auto count = accessor.count;
|
|
|
|
// ASSERT(buffer_view.target == TINYGLTF_TARGET_ARRAY_BUFFER); // ??
|
|
if (accessor.componentType != TINYGLTF_COMPONENT_TYPE_FLOAT) {
|
|
lg::die("mismatched format, wanted {} but got {}", TINYGLTF_COMPONENT_TYPE_FLOAT,
|
|
accessor.componentType);
|
|
}
|
|
ASSERT(accessor.type == TINYGLTF_TYPE_SCALAR);
|
|
|
|
std::vector<float> result(accessor.count);
|
|
for (size_t x = 0; x < count; x++) {
|
|
memcpy(&result[x], data_ptr, sizeof(float));
|
|
data_ptr += stride;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
} // namespace gltf_util
|