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/*
* Copyright 2022-2025 Frederico de Oliveira Linhares
*
* 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.
*/
#include "skeletal_mesh.hpp"
#include "../com/binary_reader.hpp"
#include "../com/command.hpp"
#include "../int/core.hpp"
#include "skeletal_mesh_vertex.hpp"
namespace
{
struct StaticMeshHeader
{
char file_magic[8];
UI32 version;
UI32 num_vertexes;
UI32 num_indexes;
UI32 num_bones;
UI32 num_animations;
UI32 num_bone_transforms; // For all animations
UI32 num_bone_positions; // For all animations
UI32 num_bone_rotations; // For all animations
UI32 num_bone_scales; // For all animations
};
constexpr UI64F SKELETAL_MESH_HEADER_SIZE{44};
// Data that is only needed for the command chain but not for the SkeletalMesh
// goes here.
struct MeshBuilder
{
std::string mesh_path;
BluCat::GRA::SkeletalMesh *mesh;
MeshBuilder(BluCat::GRA::SkeletalMesh *m, std::string mp);
MeshBuilder(BluCat::GRA::SkeletalMesh *m, const char* mp);
};
MeshBuilder::MeshBuilder(BluCat::GRA::SkeletalMesh *m, std::string mp):
mesh{m},
mesh_path{mp}
{
}
MeshBuilder::MeshBuilder(BluCat::GRA::SkeletalMesh *m, const char *mp):
MeshBuilder{m, std::string(mp)}
{
}
void
load_mesh(void *obj)
{
auto self = static_cast<MeshBuilder*>(obj);
StaticMeshHeader header;
BinaryReader input{self->mesh_path};
{ // Read header
input.read_chars(header.file_magic, 8);
header.version = input.read_ui32();
header.num_vertexes = input.read_ui32();
header.num_indexes = input.read_ui32();
header.num_bones = input.read_ui32();
header.num_animations = input.read_ui32();
header.num_bone_transforms = input.read_ui32();
header.num_bone_positions = input.read_ui32();
header.num_bone_rotations = input.read_ui32();
header.num_bone_scales = input.read_ui32();
size_t total_file_size{
SKELETAL_MESH_HEADER_SIZE +
header.num_vertexes * 16 * SIZE_32_BIT +
header.num_indexes * SIZE_32_BIT +
header.num_bones * 16 * SIZE_32_BIT +
header.num_animations * (2 * SIZE_64_BIT + SIZE_32_BIT) +
header.num_bone_transforms * 4 * SIZE_32_BIT +
header.num_bone_positions * (3 * SIZE_32_BIT + SIZE_64_BIT) +
header.num_bone_rotations * (4 * SIZE_32_BIT + SIZE_64_BIT) +
header.num_bone_scales * (3 * SIZE_32_BIT + SIZE_64_BIT)};
if(total_file_size != input.size())
{
std::string error{"File size does not match header information: "};
error += self->mesh_path;
throw CommandError{error};
}
}
self->mesh->queue_family =
BluCat::INT::core.vk_device_with_swapchain->
get_queue_family_with_graphics();
{ // Load vertexes.
std::vector<BluCat::GRA::SkeletalMeshVertex> vertexes{header.num_vertexes};
for(auto i{0}; i < header.num_vertexes; i++)
{
vertexes[i].position = input.read_vec3();
vertexes[i].normal = input.read_vec3();
vertexes[i].texture_coord = input.read_vec2();
for(auto ii{0};
ii < BluCat::GRA::SKELETAL_MESH_MAX_NUM_OF_INFLUENCING_BONES;
ii++)
vertexes[i].bone_ids[ii] = input.read_ui32();
for(auto ii{0};
ii < BluCat::GRA::SKELETAL_MESH_MAX_NUM_OF_INFLUENCING_BONES;
ii++)
vertexes[i].bone_weights[ii] = input.read_f32();
}
void *vertexes_data{vertexes.data()};
size_t vertexes_size = sizeof(vertexes[0]) * vertexes.size();
self->mesh->source_vertex_buffer = new BluCat::GRA::SourceBuffer{
self->mesh->queue_family->device, vertexes_data, vertexes_size};
self->mesh->vertex_buffer = new BluCat::GRA::DestinationBuffer{
self->mesh->queue_family, self->mesh->source_vertex_buffer,
VK_BUFFER_USAGE_VERTEX_BUFFER_BIT};
}
{ // Load indexes.
self->mesh->index_count = header.num_indexes;
std::vector<uint32_t> indexes(self->mesh->index_count);
for(auto i{0}; i < self->mesh->index_count; i++)
indexes[i] = input.read_ui32();
void *indexes_data{indexes.data()};
size_t indexes_size{sizeof(indexes[0]) * indexes.size()};
BluCat::GRA::SourceBuffer source_index_buffer{
self->mesh->queue_family->device, indexes_data, indexes_size};
self->mesh->index_buffer = new BluCat::GRA::DestinationBuffer{
self->mesh->queue_family, &source_index_buffer,
VK_BUFFER_USAGE_INDEX_BUFFER_BIT};
}
{ // Load bones
self->mesh->bones.reserve(header.num_bones);
for(int i{0}; i < header.num_bones; i++)
self->mesh->bones.emplace_back(input.read_mat4());
}
{ // Load animations
self->mesh->animations.resize(header.num_animations);
for(uint32_t i{0}; i < header.num_animations; i++)
{
auto duration{input.read_f64()};
self->mesh->animations[i].final_time = (float)duration;
auto ticks_per_second{input.read_f64()};
auto num_bone_transforms{input.read_ui32()};
std::vector<BluCat::GRA::BoneTransform> *bone_transforms =
&(self->mesh->animations[i].bone_transforms);
bone_transforms->resize(num_bone_transforms);
for(uint32_t bone_transform_index{0};
bone_transform_index < num_bone_transforms; bone_transform_index++)
{
auto bone_id{input.read_ui32()};
auto num_positions{input.read_ui32()};
BluCat::GRA::Channel<glm::vec3> *positions =
&((*bone_transforms)[bone_transform_index].positions);
for(auto position_key_index{0}; position_key_index < num_positions;
position_key_index++)
{
auto vec3{input.read_vec3()};
auto timestamp{input.read_f64()};
positions->key_frames.emplace_back(
vec3, static_cast<float>(timestamp));
}
auto num_rotations{input.read_ui32()};
BluCat::GRA::Channel<glm::quat> *rotations =
&((*bone_transforms)[bone_transform_index].rotations);
for(auto rotation_key_index{0}; rotation_key_index < num_rotations;
rotation_key_index++)
{
auto quat{input.read_quat()};
auto timestamp{input.read_f64()};
rotations->key_frames.emplace_back(
quat, static_cast<float>(timestamp));
}
auto num_scales{input.read_ui32()};
BluCat::GRA::Channel<glm::vec3> *scales =
&((*bone_transforms)[bone_transform_index].scales);
for(auto scaling_key_index{0}; scaling_key_index < num_scales;
scaling_key_index++)
{
auto vec3{input.read_vec3()};
auto timestamp{input.read_f64()};
scales->key_frames.emplace_back(vec3, static_cast<float>(timestamp));
}
}
}
}
}
void
unload_mesh(void *obj)
{
auto self = static_cast<MeshBuilder*>(obj);
delete self->mesh->index_buffer;
delete self->mesh->vertex_buffer;
delete self->mesh->source_vertex_buffer;
}
static const CommandChain loader{
{&load_mesh, &unload_mesh}
};
}
namespace BluCat::GRA
{
SkeletalMesh::SkeletalMesh(std::string mesh_path)
{
MeshBuilder mesh_builder(this, mesh_path);
loader.execute(&mesh_builder);
}
SkeletalMesh::SkeletalMesh(const char* mesh_path):
SkeletalMesh{std::string(mesh_path)}
{
}
SkeletalMesh::~SkeletalMesh()
{
MeshBuilder mesh_builder(this, "");
loader.revert(&mesh_builder);
}
}
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