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Start working on glTF model class

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Riyyi
2021-02-06 01:52:43 +01:00
parent 105912a62a
commit 1134ce6a43
2 changed files with 369 additions and 0 deletions
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inferno/src/inferno/render/gltf.cpp
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#include "inferno/util/json.h"
#include "nlohmann/json.hpp"
#include "inferno/assert.h"
#include "inferno/io/gltffile.h"
#include "inferno/io/log.h"
#include "inferno/render/gltf.h"
#include <stdint.h>
namespace Inferno {
Gltf::Gltf(const std::string& path)
: m_path(path)
{
auto gltf = GlTFFile::read(path);
ASSERT(gltf.first && gltf.second, "GlTF model was incomplete '{}'", path);
json json = json::parse(gltf.first.get());
// Properties
// Asset
// ---------------------------------
{
ASSERT(Json::hasProperty(json, "asset"), "GlTF model missing required property 'asset'");
auto asset = json["asset"];
auto copyright = Json::parseStringProperty(asset, "copyright", false);
auto generator = Json::parseStringProperty(asset, "generator", false);
auto version = Json::parseStringProperty(asset, "version", true);
ASSERT(version, "GlTF model missing required property 'version'");
ASSERT(version.value().compare("2.0") == 0, "GlTF version unsupported '{}'", version.value());
auto minVersion = Json::parseStringProperty(asset, "minVersion", false);
if (copyright) m_model.asset.copyright = copyright.value();
if (generator) m_model.asset.generator = generator.value();
if (version) m_model.asset.version = version.value();
if (minVersion) m_model.asset.minVersion = minVersion.value();
}
// Scene
// ---------------------------------
// Node
// ---------------------------------
// Mesh
// ---------------------------------
if (Json::hasProperty(json, "meshes")) {
auto meshes = json["meshes"];
ASSERT(meshes.is_array(), "GlTF model property 'meshes' invalid type");
for (auto& [key, object] : meshes.items()) {
glTF::Mesh mesh;
parseMesh(&mesh, key, object);
m_model.meshes.emplace_back(std::move(mesh));
}
}
// Accessor
// ---------------------------------
if (Json::hasProperty(json, "accessors")) {
auto accessors = json["accessors"];
ASSERT(accessors.is_array(), "GlTF model property 'accessors' invalid type");
for (auto& [key, object] : accessors.items()) {
glTF::Accessor accessor;
parseAccessor(&accessor, key, object);
m_model.accessors.emplace_back(std::move(accessor));
}
}
// Bufferview
// ---------------------------------
if (Json::hasProperty(json, "bufferViews")) {
auto bufferViews = json["bufferViews"];
ASSERT(bufferViews.is_array(), "GlTF model property 'bufferViews' invalid type");
for (auto& [key, object] : bufferViews.items()) {
glTF::BufferView bufferView;
parseBufferView(&bufferView, key, object);
m_model.bufferViews.emplace_back(std::move(bufferView));
}
}
// Buffer
// ---------------------------------
if (Json::hasProperty(json, "buffers")) {
auto buffers = json["buffers"];
ASSERT(buffers.is_array(), "GlTF model property 'buffers' invalid type");
for (auto& [key, object] : buffers.items()) {
glTF::Buffer buffer;
parseBuffer(&buffer, key, object);
m_model.buffers.emplace_back(std::move(buffer));
}
}
}
Gltf::~Gltf()
{
}
void Gltf::parsePrimitive(glTF::Primitive* primitive, const std::string& key, const json& object)
{
auto attributes = Json::parseUnsignedObjectProperty(object, "attributes", true);
ASSERT(attributes && attributes.value().size() > 0, "GlTF primitive '{}' invalid property 'attributes'", key);
auto indices = Json::parseUnsignedProperty(object, "indices", false);
auto material = Json::parseUnsignedProperty(object, "material", false);
auto mode = Json::parseUnsignedProperty(object, "mode", false);
if (Json::hasProperty(object, "targets")) {
auto targets = object["targets"];
ASSERT(targets.is_array(), "GlTF primitive '{}' property 'targets' invalid type", key);
for (auto& targetObject : targets) {
std::map<std::string, uint32_t> target;
for (auto& [key, propertyValue] : targetObject.items()) {
auto value = Json::getPropertyValue<uint32_t>(propertyValue, json::value_t::number_unsigned);
if (value) target.emplace(std::move(key), value.value());
}
ASSERT(target.size() > 0, "GlTF primitive '{}' empty 'target' object", key);
primitive->targets.emplace_back(std::move(target));
}
}
if (attributes) primitive->attributes = attributes.value();
if (indices) primitive->indices = indices.value();
if (material) primitive->material = material.value();
if (mode) primitive->mode = static_cast<unsigned char>(mode.value());
}
void Gltf::parseMesh(glTF::Mesh* mesh, const std::string& key, const json& object)
{
ASSERT(Json::hasProperty(object, "primitives"), "GlTF mesh '{}' missing required property 'primitives'", key);
auto primitives = object["primitives"];
ASSERT(primitives.is_array(), "GlTF mesh '{}' property 'primitives' invalid type", key);
for (auto& primitiveObject : primitives) {
glTF::Primitive primitive;
parsePrimitive(&primitive, key, primitiveObject);
mesh->primitives.emplace_back(std::move(primitive));
}
auto weights = Json::parseDoubleArrayProperty(object, "weights", false);
ASSERT(!weights || weights.value().size() > 0, "GlTF mesh '{}' empty 'weights' property", key);
auto name = Json::parseStringProperty(object, "name", false);
if (weights) mesh->weights = weights.value();
mesh->name = name ? name.value() : key;
}
void Gltf::parseAccessor(glTF::Accessor* accessor, const std::string& key, const json& object)
{
auto bufferView = Json::parseUnsignedProperty(object, "bufferView", false);
auto byteOffset = Json::parseUnsignedProperty(object, "byteOffset", false);
auto componentType = Json::parseUnsignedProperty(object, "componentType", true);
ASSERT(componentType, "GlTF accessor '{}' missing required property 'componentType'", key);
auto normalized = Json::parseBoolProperty(object, "normalized", false);
auto count = Json::parseUnsignedProperty(object, "count", true);
ASSERT(count, "GlTF accessor '{}' missing required property 'count'", key);
auto type = Json::parseStringProperty(object, "type", true);
ASSERT(type, "GlTF accessor '{}' missing required property 'type'", key);
auto max = Json::parseDoubleArrayProperty(object, "max", false);
ASSERT(!max || max.value().size() > 0, "GlTF accessor '{}' empty 'max' property", key);
auto min = Json::parseDoubleArrayProperty(object, "min", false);
ASSERT(!min || min.value().size() > 0, "GlTF accessor '{}' empty 'min' property", key);
auto name = Json::parseStringProperty(object, "name", false);
if (bufferView) accessor->bufferView = bufferView.value();
if (byteOffset) accessor->byteOffset = byteOffset.value();
if (normalized) accessor->normalized = normalized.value();
if (count) accessor->count = count.value();
if (type) accessor->type = type.value();
if (max) accessor->max = max.value();
if (min) accessor->min = min.value();
accessor->name = name ? name.value() : key;
}
void Gltf::parseBufferView(glTF::BufferView* bufferView, const std::string& key, const json& object)
{
auto buffer = Json::parseUnsignedProperty(object, "buffer", false);
ASSERT(buffer, "GlTF bufferView '{}' missing required property 'buffer'", key);
auto byteOffset = Json::parseUnsignedProperty(object, "byteOffset", false);
auto byteLength = Json::parseUnsignedProperty(object, "byteLength", true);
ASSERT(byteLength, "GlTF bufferView '{}' missing required property 'byteLength'", key);
auto byteStride = Json::parseUnsignedProperty(object, "byteStride", false);
auto target = Json::parseUnsignedProperty(object, "target", false);
auto name = Json::parseStringProperty(object, "name", false);
if (buffer) bufferView->buffer = buffer.value();
if (byteOffset) bufferView->byteOffset = byteOffset.value();
if (byteLength) bufferView->byteLength = byteLength.value();
if (byteStride) bufferView->byteStride = byteStride.value();
if (target) bufferView->target = target.value();
bufferView->name = name ? name.value() : key;
}
void Gltf::parseBuffer(glTF::Buffer* buffer, const std::string& key, const json& object)
{
auto uri = Json::parseStringProperty(object, "buffer", false);
auto byteLength = Json::parseUnsignedProperty(object, "byteLength", true);
ASSERT(byteLength, "GlTF buffer '{}' missing required property 'byteLength'", key);
auto name = Json::parseStringProperty(object, "name", false);
if (uri) buffer->uri = uri.value();
if (byteLength) buffer->byteLength = byteLength.value();
buffer->name = name ? name.value() : key;
}
} // namespace Inferno
inferno/src/inferno/render/gltf.h
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#ifndef GLTF_H
#define GLTF_H
#include <cstdint> // uint32_t
#include <memory> // std::shared_ptr
#include <stdint.h>
#include <string> // std::string
#include <unordered_map> // std::unordered_map
#include <vector> // std::vector
#include "inferno/util/json.h"
namespace Inferno {
namespace glTF {
// https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#objects
// https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#reference-asset
struct Asset {
std::string copyright;
std::string generator;
std::string version; // required
std::string minVersion;
};
// https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#primitive
struct Primitive {
std::map<std::string, uint32_t> attributes; // required
uint32_t indices;
uint32_t material;
unsigned char mode { 4 };
std::vector<std::map<std::string, uint32_t>> targets;
};
// https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#mesh
struct Mesh {
std::vector<Primitive> primitives; // required
std::vector<double> weights;
std::string name;
};
// https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#accessors
// https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#accessor
struct Accessor {
uint32_t bufferView;
uint32_t byteOffset { 0 };
uint32_t componentType; // required
bool normalized { false };
uint32_t count; // required
std::string type; // required
std::vector<double> max;
std::vector<double> min;
std::string name;
};
// https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#bufferview
struct BufferView {
uint32_t buffer; // required
uint32_t byteOffset { 0 };
uint32_t byteLength; // required
uint32_t byteStride;
uint32_t target;
std::string name;
};
struct Buffer {
std::string uri;
uint32_t byteLength; // required
std::string name;
};
struct Model {
Asset asset;
std::vector<Mesh> meshes;
std::vector<Accessor> accessors;
std::vector<BufferView> bufferViews;
std::vector<Buffer> buffers;
};
} // namespace glTF
// -----------------------------------------
class Gltf {
public:
Gltf(const std::string& path);
virtual ~Gltf();
inline const glTF::Model& model() const { return m_model; }
private:
static void parsePrimitive(glTF::Primitive* primitive, const std::string& key, const json& object);
static void parseMesh(glTF::Mesh* mesh, const std::string& key, const json& object);
static void parseAccessor(glTF::Accessor* accessor, const std::string& key, const json& object);
static void parseBufferView(glTF::BufferView* bufferView, const std::string& key, const json& object);
static void parseBuffer(glTF::Buffer* buffer, const std::string& key, const json& object);
std::string m_path;
glTF::Model m_model;
};
// -----------------------------------------
class GltfManager {
public:
void initialize();
void destroy();
void add(const std::string& path, const std::shared_ptr<Gltf>& gltf);
std::shared_ptr<Gltf> load(const std::string& path);
std::shared_ptr<Gltf> get(const std::string& path);
bool exists(const std::string& path);
void remove(const std::string& path);
void remove(const std::shared_ptr<Gltf>& gltf);
static inline GltfManager& the() { return *s_instance; }
private:
std::unordered_map<std::string, std::shared_ptr<Gltf>> m_gltfList;
static GltfManager* s_instance;
};
} // namespace Inferno
#endif // GLTF_H