void SubMesh::DrawImmediate()
{
if (!loaded)
return;
glBegin(GL_TRIANGLES);
for (int i = 0; i < meshInfo.triCount; ++i)
{
Triangle t = GetTriangle(i);
if (HasTextureCoords())
{
for (int j = 0; j < 3; ++j)
{
VertexPositionTexcoord* vpt = GetVertexData<VertexPositionTexcoord>(t.index[j]);
glVertex3fv(vpt->position);
glTexCoord2fv(vpt->texCoord);
}
}
else
{
for (int j = 0; j < 3; ++j)
{
VertexPositionNormalTexcoord* vpnt = GetVertexData<VertexPositionNormalTexcoord>(t.index[j]);
glVertex3fv(vpnt->position);
if (HasNormals())
glNormal3fv(vpnt->normal);
if (HasTextureCoords())
glTexCoord2fv(vpnt->texCoord);
}
}
}
glEnd();
}
void Mesh::loadMeshdata(const std::string& a_Filepath)
{
Assimp::Importer importer;
const auto scene = importer.ReadFile(a_Filepath, aiPostProcessSteps::aiProcess_CalcTangentSpace |
aiPostProcessSteps::aiProcess_Triangulate |
aiPostProcessSteps::aiProcess_JoinIdenticalVertices |
aiPostProcessSteps::aiProcess_SortByPType);
auto error = importer.GetErrorString();
auto mesh = scene->mMeshes[0];
m_Vertices.reserve(mesh->mNumVertices);
for (auto i = 0u; i < mesh->mNumVertices; i++)
{
m_Vertices.emplace_back(toXMFloat3(mesh->mVertices[i]),
mesh->HasVertexColors(i) ? toXMFloat4(mesh->mColors[0][i]) : XMFLOAT4(1.0f, 1.0f, 1.0f, 1.0f),
mesh->HasTextureCoords(i) ? toXMFloat2(mesh->mTextureCoords[0][i]) : XMFLOAT2(0.0f, 0.0f));
}
m_Indices.reserve(mesh->mNumFaces * 3);
for (auto i = 0u; i < mesh->mNumFaces; ++i)
{
aiFace currentFace = mesh->mFaces[i];
for (auto j = 0u; j < currentFace.mNumIndices; ++j)
{
m_Indices.push_back(currentFace.mIndices[j]);
}
}
}
void SubMesh::InitialiseVAO()
{
glGenVertexArrays(1, &vaoID);
glGenBuffers(1, &bufID);
glGenBuffers(1, &indexBufID);
glBindVertexArray(vaoID);
glBindBuffer(GL_ARRAY_BUFFER, bufID);
glBufferData(GL_ARRAY_BUFFER, meshInfo.vertexSize * meshInfo.vertexCount , meshData, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBufID);
switch (meshInfo.indexFormat)
{
case GL_UNSIGNED_INT:
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(unsigned int) * meshInfo.triCount * 3, longIndexData, GL_STATIC_DRAW);
break;
case GL_UNSIGNED_SHORT:
glBufferData(GL_ELEMENT_ARRAY_BUFFER, meshInfo.triCount * 3 * sizeof(unsigned short), indexData, GL_STATIC_DRAW);
break;
case GL_UNSIGNED_BYTE:
glBufferData(GL_ELEMENT_ARRAY_BUFFER, meshInfo.triCount * 3 * sizeof(unsigned char), byteIndexData, GL_STATIC_DRAW);
break;
}
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, meshInfo.vertexSize, (void*)0);
if (HasNormals())
{
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, meshInfo.vertexSize, (void*)(3 * sizeof(float)));
if (HasTextureCoords())
{
glEnableVertexAttribArray(2);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, meshInfo.vertexSize, (char*)0 + 6 * sizeof(float));
}
}
else if (HasTextureCoords())
{
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, meshInfo.vertexSize, (char*)0 + 3 * sizeof(float));
}
glBindVertexArray(0);
loaded = true;
}
// Assuming the metallic-roughness material model of models loaded with GLTF.
std::pair<ID, std::vector<std::pair<Texture::Type, std::string>>>
MeshManager::load_mesh(const std::string& directory, const std::string& file) {
MeshInformation mesh_info;
mesh_info.loaded_from_filepath = directory + file;
Assimp::Importer importer;
auto scene = importer.ReadFile(mesh_info.loaded_from_filepath.c_str(), aiProcess_Triangulate | aiProcess_JoinIdenticalVertices);
if (scene == nullptr || scene->mFlags & AI_SCENE_FLAGS_INCOMPLETE) {
Log::error(std::string(importer.GetErrorString()));
return {0, {}};
}
std::vector<std::pair<Texture::Type, std::string>> texture_info;
if (scene->HasMaterials()) {
Log::info("Number of materials: " + std::to_string(scene->mNumMaterials));
for (size_t i = 0; i < scene->mNumMaterials; i++) {
auto material = scene->mMaterials[i];
aiString material_name;
material->Get(AI_MATKEY_NAME, material_name);
Log::info("Material name: " + std::string(material_name.C_Str()));
aiString diffuse_filepath;
if (material->GetTexture(aiTextureType_DIFFUSE, 0, &diffuse_filepath) == AI_SUCCESS) {
Log::info("Diffuse texture name: " + std::string(directory.c_str()) + std::string(diffuse_filepath.data));
std::string texture_filepath(diffuse_filepath.data);
texture_filepath.insert(0, directory);
texture_info.push_back({Texture::Type::Diffuse, texture_filepath});
}
aiString specular_filepath;
if (material->GetTexture(aiTextureType_SPECULAR, 0, &specular_filepath) == AI_SUCCESS) {
Log::info("Specular texture name: " + std::string(directory.c_str()) + std::string(specular_filepath.data));
}
aiString ambient_filepath;
if (material->GetTexture(aiTextureType_AMBIENT, 0, &ambient_filepath) == AI_SUCCESS) {
Log::info("Ambient occlusion texture name: " + std::string(directory.c_str()) + std::string(ambient_filepath.data));
}
aiString shininess_filepath;
if (material->GetTexture(aiTextureType_SHININESS, 0, &shininess_filepath) == AI_SUCCESS) {
Log::info("Shininess texture name: " + std::string(directory.c_str()) + std::string(shininess_filepath.data));
}
aiString emissive_filepath;
if (material->GetTexture(aiTextureType_EMISSIVE, 0, &emissive_filepath) == AI_SUCCESS) {
Log::info("Emissive texture name: " + std::string(directory.c_str()) + std::string(emissive_filepath.data));
std::string texture_filepath(emissive_filepath.data);
texture_filepath.insert(0, directory);
texture_info.push_back({Texture::Type::Emissive, texture_filepath});
// TODO: Fetch emissive factor as well
}
aiString displacement_filepath;
if (material->GetTexture(aiTextureType_DISPLACEMENT, 0, &displacement_filepath) == AI_SUCCESS) {
Log::info("Displacement texture name: " + std::string(directory.c_str()) + std::string(displacement_filepath.data));
}
aiString height_filepath;
if (material->GetTexture(aiTextureType_HEIGHT, 0, &height_filepath) == AI_SUCCESS) {
Log::info("Bumpmap texture name: " + std::string(directory.c_str()) + std::string(height_filepath.data));
}
// Lightmap is usually the ambient occlusion map ...
aiString lightmap_filepath;
if (material->GetTexture(aiTextureType_LIGHTMAP, 0, &lightmap_filepath) == AI_SUCCESS) {
Log::info("Lightmap texture name: " + std::string(directory.c_str()) + std::string(lightmap_filepath.data));
std::string texture_filepath(lightmap_filepath.data);
texture_filepath.insert(0, directory);
texture_info.push_back({Texture::Type::AmbientOcclusion, texture_filepath});
}
aiString normals_filepath;
if (material->GetTexture(aiTextureType_NORMALS, 0, &normals_filepath) == AI_SUCCESS) {
Log::info("Normals texture name: " + std::string(directory.c_str()) + std::string(normals_filepath.data));
}
aiString reflection_filepath;
if (material->GetTexture(aiTextureType_REFLECTION, 0, &reflection_filepath) == AI_SUCCESS) {
Log::info("Reflection texture name: " + std::string(directory.c_str()) + std::string(reflection_filepath.data));
}
aiString opacity_filepath;
if (material->GetTexture(aiTextureType_OPACITY, 0, &opacity_filepath) == AI_SUCCESS) {
Log::info("Opacity texture name: " + std::string(directory.c_str()) + std::string(opacity_filepath.data));
}
// NOTE: Roughness metallic textures are not detected so here we are assuming this is the unknown texture of the material.
aiString unknown_filepath;
if (material->GetTexture(aiTextureType_UNKNOWN, 0, &unknown_filepath) == AI_SUCCESS) {
Log::info("Unknown texture name: " + std::string(directory.c_str()) + std::string(unknown_filepath.data));
std::string texture_filepath(normals_filepath.data);
texture_filepath.insert(0, directory);
texture_info.push_back({Texture::Type::MetallicRoughness, texture_filepath});
}
}
}
if (scene->HasMeshes()) {
// FIXME: Assumes the mesh is a single mesh and not a hierarchy
Log::info("Scene: # meshes " + std::to_string(scene->mNumMeshes));
for (size_t i = 0; i < scene->mNumMeshes; i++) {
auto mesh = scene->mMeshes[i];
Log::info("Loading mesh with name: " + std::string(mesh->mName.data));
for (size_t j = 0; j < mesh->mNumVertices; j++) {
Vertex vertex;
auto pos = mesh->mVertices[j];
vertex.position = {pos.x, pos.y, pos.z};
if (mesh->HasTextureCoords(0)) {
auto tex_coord = mesh->mTextureCoords[0][j];
vertex.tex_coord = {tex_coord.x, -tex_coord.y}; // glTF (& .obj) has a flipped texture coordinate system compared to OpenGL
}
if (mesh->HasNormals()) {
auto normal = mesh->mNormals[j];
vertex.normal = {normal.x, normal.y, normal.z};
}
mesh_info.mesh.vertices.push_back(vertex);
}
for (size_t j = 0; j < mesh->mNumFaces; j++) {
auto face = &mesh->mFaces[j];
if (face->mNumIndices != 3) {
Log::warn("Not 3 vertices per face in model.");
return {0, {}};
}
for (size_t k = 0; k < 3; k++) {
auto index = face->mIndices[k];
mesh_info.mesh.indices.push_back(index);
}
}
}
}
// FIXME: Mesh id is worthless since it does not change or anything ...
loaded_meshes.push_back(mesh_info.mesh);
return {loaded_meshes.size() - 1, texture_info};
}
MeshPtr AssimpMeshIO::load(const std::string &mesh_name, const std::string &file_name, unsigned int mesh_index, const BufferManagerPtr &buffer_manager, const VaoManagerPtr &vao_manager)
{
auto scene = importer->ReadFile(file_name, aiProcessPreset_TargetRealtime_MaxQuality | aiProcess_ConvertToLeftHanded);
if (scene == nullptr)
{
throw clan::Exception(clan::string_format("Unable to locate (%1) for (%2)", file_name, mesh_name));
}
if (scene->mNumMeshes <= mesh_index)
throw clan::Exception(clan::string_format("The mesh index (%1) was out of bounds for mesh %2.", mesh_index, mesh_name));
auto scene_mesh = scene->mMeshes[mesh_index];
unsigned int stride = 0;
std::vector<Core::VertexAttribute> interleaved_spec;
Core::VaoLayout vao_layout;
Core::RenderCommand render_command;
// vectors to store bounds position and size in.
glm::vec3 mesh_bounds_pos = glm::vec3(0);
glm::vec3 mesh_bounds_size = glm::vec3(0);
if (scene_mesh->HasPositions() && scene_mesh->mNumVertices > 0)
{
mesh_bounds_pos = glm::vec3(scene_mesh->mVertices[0].x, scene_mesh->mVertices[0].y, scene_mesh->mVertices[0].z);
mesh_bounds_size = mesh_bounds_pos;
}
//
// Set up vertices
//
// Set up the interleaved vertex attributes
if (scene_mesh->HasPositions())
{
stride += sizeof(glm::vec3);
interleaved_spec.push_back(Core::VaoArg<glm::vec3>(Core::ShaderConstants::Position));
}
if (scene_mesh->HasNormals())
{
stride += sizeof(glm::vec3);
interleaved_spec.push_back(Core::VaoArg<glm::vec3>(Core::ShaderConstants::Normal));
}
if (scene_mesh->HasTextureCoords(0))
{
stride += sizeof(glm::vec2);
interleaved_spec.push_back(Core::VaoArg<glm::vec2>(Core::ShaderConstants::TexCoord));
}
if (scene_mesh->HasTangentsAndBitangents())
{
stride += 2*sizeof(glm::vec3);
interleaved_spec.push_back(Core::VaoArg<glm::vec3>(Core::ShaderConstants::Tangent));
interleaved_spec.push_back(Core::VaoArg<glm::vec3>(Core::ShaderConstants::Bitangent));
}
std::vector<float> vertices;
vertices.reserve(scene_mesh->mNumVertices * stride / sizeof(float)); // This is how many floats we have
for (unsigned int i = 0; i < scene_mesh->mNumVertices; i++) {
// This may be made into a lambda for BuffeOperations::unsafe_upload
if (scene_mesh->HasPositions())
{
auto position = scene_mesh->mVertices[i];
vertices.push_back(position.x);
vertices.push_back(position.y);
vertices.push_back(position.z);
// check for new min-max component in vertex, and update bounds.
check_if_new_min_or_max_vertex(glm::vec3(position.x, position.y, position.z),
mesh_bounds_pos, mesh_bounds_size);
}
if (scene_mesh->HasNormals())
{
auto normal = scene_mesh->mNormals[i];
vertices.push_back(normal.x);
vertices.push_back(normal.y);
vertices.push_back(normal.z);
}
if (scene_mesh->HasTextureCoords(0))
{
auto texcoord = scene_mesh->mTextureCoords[0][i];
vertices.push_back(texcoord.x);
vertices.push_back(texcoord.y);
}
if (scene_mesh->HasTangentsAndBitangents())
{
auto tangent = scene_mesh->mTangents[i];
vertices.push_back(tangent.x);
vertices.push_back(tangent.y);
vertices.push_back(tangent.z);
auto bitangent = scene_mesh->mBitangents[i];
vertices.push_back(bitangent.x);
vertices.push_back(bitangent.y);
vertices.push_back(bitangent.z);
}
}
auto vertex_allocation = buffer_manager->allocate(vertices.size()*stride, stride);
vertex_allocation.upload(vertices);
vao_layout
.for_buffer(vertex_allocation)
.use_as(GL_ARRAY_BUFFER)
.bind_interleaved(0, 0, interleaved_spec);
render_command.set_draw_mode(GL_TRIANGLES);
render_command.set_vertices(vertex_allocation, scene_mesh->mNumVertices, stride);
//
// Set up indices
//
if (scene_mesh->HasFaces()) {
std::vector<unsigned int> indices;
for (unsigned int i = 0; i < scene_mesh->mNumFaces; i++) {
auto face = scene_mesh->mFaces[i];
for (unsigned int j = 0; j < face.mNumIndices; j++) {
indices.push_back(face.mIndices[j]);
}
}
auto index_allocation = buffer_manager->allocate_and_upload(indices);
vao_layout
.for_buffer(index_allocation)
.use_as(GL_ELEMENT_ARRAY_BUFFER);
render_command.set_indices(index_allocation, indices);
}
// Ensure that mesh_bounds_size is the distance from mesh_bounds_pos to upper-right-back-corner of the bounds
mesh_bounds_size = glm::vec3(
mesh_bounds_size.x - mesh_bounds_pos.x,
mesh_bounds_size.y - mesh_bounds_pos.y,
mesh_bounds_size.z - mesh_bounds_pos.z
);
return std::make_shared<Mesh>(render_command, vao_layout, vao_manager, mesh_name, mesh_bounds_pos, mesh_bounds_size);
}
std::vector<Vertex> ModelLoader::load(int& numTriangles, int& numTextures)
{
std::ifstream fileCheck(filename);
Vertex tempVert;
std::vector<Vertex> geometry;
std::deque<aiVector3D> texCoord;
numTriangles = 0;
numTextures = 0;
for(int i = 0; i < 3; i++)
tempVert.color[i] = 1.0;
if(!fileCheck) {
std::cerr << "Error: Unable to open object file" << std::endl;
exit(-1);
}
fileCheck.close();
Assimp::Importer importer;
auto scene = importer.ReadFile(filename, aiProcessPreset_TargetRealtime_Fast);
if(!scene) {
std::cerr << "Error: " << importer.GetErrorString() << std::endl;
exit(-1);
}
std::cout << "Material Count: " << scene->mNumMaterials << std::endl;
if(scene->HasMaterials()) {
const auto& material = scene->mMaterials[0];
aiColor3D color(0.0f,0.0f,0.0);
material->Get(AI_MATKEY_COLOR_DIFFUSE, color);
tempVert.color[0] = color.r;
tempVert.color[1] = color.g;
tempVert.color[2] = color.b;
}
for(unsigned int i = 0; i < scene->mNumMeshes; i++) {
auto mesh = scene->mMeshes[i];
if(scene->mNumMaterials > i+1) {
auto material = scene->mMaterials[i+1];
aiColor3D color(1.0f,1.0f,1.0f);
material->Get(AI_MATKEY_COLOR_DIFFUSE, color);
tempVert.color[0] = color.r;
tempVert.color[1] = color.g;
tempVert.color[2] = color.b;
if(material->GetTextureCount(aiTextureType_DIFFUSE) > 0) {
aiString path;
if(material->GetTexture(aiTextureType_DIFFUSE, 0, &path,
NULL, NULL, NULL, NULL, NULL) == AI_SUCCESS) {
std::cout << "Texture Path: " << path.C_Str() << std::endl;
numTextures++;
loadTexture(path.C_Str());
/*
for(unsigned int j = 0; j < mesh->mNumVertices; j++) {
const auto textureCoords = mesh->HasTextureCoords(0) ?
mesh->mTextureCoords[0][j] : aiVector3D(0.0f,0.0f,0.0f);
//texCoord.emplace_back(textureCoords);
}
*/
}
}
}
numTriangles += mesh->mNumFaces;
for(unsigned int j = 0; j < mesh->mNumFaces; j++) {
const auto& face = mesh->mFaces[j];
for(unsigned int k = 0; k < face.mNumIndices; k++) {
const auto& vertex = mesh->mVertices[face.mIndices[k]];
tempVert.position[0] = vertex.x;
tempVert.position[1] = vertex.y;
tempVert.position[2] = vertex.z;
const auto& textureVertex = mesh->HasTextureCoords(0) ? mesh->mTextureCoords[0][face.mIndices[k]]
: aiVector3D(0,0,0);
tempVert.textCoord[0] = textureVertex[0];
tempVert.textCoord[1] = textureVertex[1];
geometry.push_back(tempVert);
}
}
}
//loadTexture("checkerboard.jpg");
std::cout << "size: " << geometry.size() << std::endl
<< "bytes: " << sizeof(tempVert) * geometry.size() << std::endl;
return geometry;
}
