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#include "xe_model.hpp"
#include "xe_engine.hpp"
#define TINYOBJLOADER_IMPLEMENTATION
#include "xe_obj_loader.hpp"
#define GLM_ENABLE_EXPERIMENTAL
#include <glm/gtx/hash.hpp>
#include <cassert>
#include <cstring>
#include <unordered_map>
#include <iostream>
namespace xe {
//
// CONSTRUCTORS AND DECONSTUCTORS
//
Model::Model(const Model::Builder &builder) : xeDevice{Engine::getInstance()->xeDevice} {
createVertexBuffers(builder.vertexData.data, builder.vertexSize);
createIndexBuffers(builder.indices);
}
Model::~Model() {}
//
// LOADERS AND DELETORS
//
static std::set<Model*> CREATED_MODELS{};
static std::set<Model*> DELETION_QUEUE{};
Model* Model::createModel(const std::string &filepath) {
Builder builder{};
builder.loadModel(filepath);
return createModel(builder);
}
Model* Model::createModel(Builder& builder) {
Model* model = new Model(builder);
CREATED_MODELS.insert(model);
return model;
}
void Model::deleteModel(Model* model) {
if(CREATED_MODELS.count(model)) {
CREATED_MODELS.erase(model);
DELETION_QUEUE.insert(model);
}
}
void Model::submitDeleteQueue(bool purge) {
vkDeviceWaitIdle(Engine::getInstance()->xeDevice.device());
for(Model* model: DELETION_QUEUE) {
try { delete model; } catch(int err) {};
}
DELETION_QUEUE.clear();
if (purge) {
for(Model* model: CREATED_MODELS) {
try { delete model; } catch(int err) {};
}
CREATED_MODELS.clear();
}
}
//
// MODEL CREATION FUNCTIONS
//
void Model::createVertexBuffers(const std::vector<unsigned char> &vertexData, uint32_t vertexSize) {
vertexCount = static_cast<uint32_t>(vertexData.size()) / vertexSize;
assert(vertexCount >= 3 && "Vertex count must be atleast 3");
VkDeviceSize bufferSize = vertexData.size();
Buffer stagingBuffer {
xeDevice,
vertexSize,
vertexCount,
VK_BUFFER_USAGE_TRANSFER_SRC_BIT,
VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT
};
stagingBuffer.map();
stagingBuffer.writeToBuffer((void *)vertexData.data());
vertexBuffer = std::make_unique<Buffer>(
xeDevice,
vertexSize,
vertexCount,
VK_BUFFER_USAGE_VERTEX_BUFFER_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT,
VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT
);
xeDevice.copyBuffer(stagingBuffer.getBuffer(), vertexBuffer->getBuffer(), bufferSize);
}
void Model::createIndexBuffers(const std::vector<uint32_t> &indexData) {
indexCount = static_cast<uint32_t>(indexData.size());
hasIndexBuffer = indexCount > 0;
if (!hasIndexBuffer) {
return;
}
VkDeviceSize bufferSize = sizeof(indexData[0]) * indexCount;
uint32_t indexSize = sizeof(indexData[0]);
Buffer stagingBuffer {
xeDevice,
indexSize,
indexCount,
VK_BUFFER_USAGE_TRANSFER_SRC_BIT,
VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT
};
stagingBuffer.map();
stagingBuffer.writeToBuffer((void *)indexData.data());
indexBuffer = std::make_unique<Buffer>(
xeDevice,
indexSize,
indexCount,
VK_BUFFER_USAGE_INDEX_BUFFER_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT,
VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT
);
xeDevice.copyBuffer(stagingBuffer.getBuffer(), indexBuffer->getBuffer(), bufferSize);
}
void Model::bind(VkCommandBuffer commandBuffer) {
VkBuffer buffers[] = {vertexBuffer->getBuffer()};
VkDeviceSize offsets[] = {0};
vkCmdBindVertexBuffers(commandBuffer, 0, 1, buffers, offsets);
if (hasIndexBuffer) {
vkCmdBindIndexBuffer(commandBuffer, indexBuffer->getBuffer(), 0, VK_INDEX_TYPE_UINT32);
}
}
void Model::draw(VkCommandBuffer commandBuffer) {
if (hasIndexBuffer) {
vkCmdDrawIndexed(commandBuffer, indexCount, 1, 0, 0, 0);
} else {
vkCmdDraw(commandBuffer, vertexCount, 1, 0, 0);
}
}
void Model::Builder::loadModel(const std::string &filepath) {
tinyobj::attrib_t attrib;
std::vector<tinyobj::shape_t> shapes;
std::vector<tinyobj::material_t> materials;
std::string warn, err;
if (!tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err, filepath.c_str())) {
throw std::runtime_error(warn + err);
}
vertexData.data.clear();
indices.clear();
vertexSize = 0;
bool vertex, normal, uvs;
for (const auto &shape : shapes) {
for (const auto &index : shape.mesh.indices) {
if(index.vertex_index >= 0) {
vertexData.write<float>(attrib.vertices[3 * index.vertex_index + 0]);
vertexData.write<float>(attrib.vertices[3 * index.vertex_index + 1]);
vertexData.write<float>(attrib.vertices[3 * index.vertex_index + 2]);
vertex = true;
}
if(index.normal_index >= 0) {
vertexData.write<float>(attrib.normals[3 * index.normal_index + 0]);
vertexData.write<float>(attrib.normals[3 * index.normal_index + 1]);
vertexData.write<float>(attrib.normals[3 * index.normal_index + 2]);
normal = true;
}
if(index.texcoord_index >= 0) {
vertexData.write<float>(attrib.texcoords[2 * index.texcoord_index + 0]);
vertexData.write<float>(attrib.texcoords[2 * index.texcoord_index + 1]);
uvs = true;
}
}
}
if(vertex)
vertexSize += 12;
if(normal)
vertexSize += 12;
if(uvs)
vertexSize += 8;
}
}
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