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#include "xe_model.hpp"
#include "xe_utils.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>
namespace std {
template<>
struct hash<xe::XeModel::Vertex> {
size_t operator()(xe::XeModel::Vertex const &vertex) const {
size_t seed = 0;
xe::hashCombine(seed, vertex.position, vertex.normal, vertex.uv);
return seed;
}
};
}
namespace xe {
XeModel::XeModel(XeDevice &device, const XeModel::Builder &builder) : xeDevice{device} {
createVertexBuffers(builder.vertices);
createIndexBuffers(builder.indices);
}
XeModel::~XeModel() {}
std::unique_ptr<XeModel> XeModel::createModelFromFile(XeDevice &device, const std::string &filepath) {
Builder builder{};
builder.loadModel(filepath);
return std::make_unique<XeModel>(device, builder);
}
void XeModel::createVertexBuffers(const std::vector<Vertex> &vertices) {
vertexCount = static_cast<uint32_t>(vertices.size());
assert(vertexCount >= 3 && "Vertex count must be atleast 3");
VkDeviceSize bufferSize = sizeof(vertices[0]) * vertexCount;
uint32_t vertexSize = sizeof(vertices[0]);
XeBuffer 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 *)vertices.data());
vertexBuffer = std::make_unique<XeBuffer>(
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 XeModel::createIndexBuffers(const std::vector<uint32_t> &indices) {
indexCount = static_cast<uint32_t>(indices.size());
hasIndexBuffer = indexCount > 0;
if (!hasIndexBuffer) {
return;
}
VkDeviceSize bufferSize = sizeof(indices[0]) * indexCount;
uint32_t indexSize = sizeof(indices[0]);
XeBuffer 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 *)indices.data());
indexBuffer = std::make_unique<XeBuffer>(
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 XeModel::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 XeModel::draw(VkCommandBuffer commandBuffer) {
if (hasIndexBuffer) {
vkCmdDrawIndexed(commandBuffer, indexCount, 1, 0, 0, 0);
} else {
vkCmdDraw(commandBuffer, vertexCount, 1, 0, 0);
}
}
std::vector<VkVertexInputBindingDescription> XeModel::Vertex::getBindingDescriptions() {
std::vector<VkVertexInputBindingDescription> bindingDescriptions(1);
bindingDescriptions[0].binding = 0;
bindingDescriptions[0].stride = sizeof(Vertex);
bindingDescriptions[0].inputRate = VK_VERTEX_INPUT_RATE_VERTEX;
return bindingDescriptions;
}
std::vector<VkVertexInputAttributeDescription> XeModel::Vertex::getAttributeDescriptions() {
std::vector<VkVertexInputAttributeDescription> attributeDescptions{};
attributeDescptions.push_back({0, 0, VK_FORMAT_R32G32B32_SFLOAT, offsetof(Vertex, position)});
attributeDescptions.push_back({1, 0, VK_FORMAT_R32G32B32_SFLOAT, offsetof(Vertex, color)});
attributeDescptions.push_back({2, 0, VK_FORMAT_R32G32B32_SFLOAT, offsetof(Vertex, normal)});
attributeDescptions.push_back({3, 0, VK_FORMAT_R32G32_SFLOAT, offsetof(Vertex, uv)});
return attributeDescptions;
}
void XeModel::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);
}
vertices.clear();
indices.clear();
std::unordered_map<Vertex, uint32_t> uniqueVertices{};
for (const auto &shape : shapes) {
for (const auto &index : shape.mesh.indices) {
Vertex vertex{};
if(index.vertex_index >= 0) {
vertex.position = {
attrib.vertices[3 * index.vertex_index + 0],
attrib.vertices[3 * index.vertex_index + 1],
attrib.vertices[3 * index.vertex_index + 2]
};
vertex.color = {
attrib.colors[3 * index.vertex_index + 0],
attrib.colors[3 * index.vertex_index + 1],
attrib.colors[3 * index.vertex_index + 2]
};
}
if(index.normal_index >= 0) {
vertex.normal = {
attrib.normals[3 * index.normal_index + 0],
attrib.normals[3 * index.normal_index + 1],
attrib.normals[3 * index.normal_index + 2]
};
}
if(index.texcoord_index >= 0) {
vertex.uv = {
attrib.texcoords[2 * index.texcoord_index + 0],
attrib.texcoords[2 * index.texcoord_index + 1],
};
}
if (uniqueVertices.count(vertex) == 0) {
uniqueVertices[vertex] = static_cast<uint32_t>(vertices.size());
vertices.push_back(vertex);
}
indices.push_back(uniqueVertices[vertex]);
}
}
}
}
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