bool Mesh::Load(const GLfloat* positions,
const GLfloat* colors,
const GLfloat* normals,
const GLfloat* texCoords,
const GLuint* indices,
int numVertices,
int numIndices,
GLenum drawMode,
StorageType storageType
)
{
if (!positions || numVertices <= 0)
{
return false;
}
mDrawMode = drawMode;
mStorageType = storageType;
mNumVertices = numVertices;
mNumIndices = (numIndices <= 0 || indices == nullptr) ? numVertices : numIndices;
mHasColors = (colors != nullptr);
mHasNormals = (normals != nullptr);
mHasTexCoord = (texCoords != nullptr);
mVertexSize = 3 + 3*mHasColors + 3*mHasNormals + 2*mHasTexCoord;
mVertices = new GLfloat [mVertexSize * mNumVertices];
mIndices = new GLuint [mNumIndices];
if (mStorageType == kTightlyPacked)
{
// Initialize vertices buffer array.
for (int i = 0; i < mNumVertices; i++)
{
float* position = PositionAt(i);
float* texCoord = TexCoordAt(i);
float* normal = NormalAt(i);
float* color = ColorAt(i);
memcpy(position, positions + 3*i, sizeof(GLfloat)*3);
if (HasColors())
{
memcpy(color, colors + 3*i, sizeof(GLfloat)*3);
}
if (HasNormals())
{
memcpy(normal, normals + 3*i, sizeof(GLfloat)*3);
}
if (HasTexCoord())
{
memcpy(texCoord, texCoords + 2*i, sizeof(GLfloat)*2);
}
}
}
else
{
GLfloat* dest = mVertices;
memcpy(dest, positions, 3*sizeof(GLfloat)*mNumVertices);
dest += 3*mNumVertices;
if (HasColors())
{
memcpy(dest, colors, 3*sizeof(GLfloat)*mNumVertices);
dest += 3*mNumVertices;
}
if (HasNormals())
{
memcpy(dest, normals, 3*sizeof(GLfloat)*mNumVertices);
dest += 3*mNumVertices;
}
if (HasTexCoord())
{
memcpy(dest, texCoords, 2*sizeof(GLfloat)*mNumVertices);
dest += 2*mNumVertices;
}
}
// Initialize element array (indices array).
if (indices) // Element array provided.
{
memcpy(mIndices, indices, sizeof(GLuint)*mNumIndices);
}
else // Element array wasn't provided -- build it up.
{
for (int i = 0; i < mNumIndices; i++)
{
mIndices[i] = i;
}
}
mInitialized = true;
Mesh::Upload();
return true;
}
void Mesh::Upload()
{
if (mProgramHandle == 0)
{
std::cerr << "ERROR Program Handle must be set before creating buffer objects.\n";
return;
}
if (!mInitialized)
{
std::cerr << "ERROR The mesh must be initialized before creating buffer objects.\n";
return;
}
// Specify how the arguments will be passed to shaders.
GLuint locTexCoordAttrib = glGetAttribLocation(mProgramHandle, "in_tex_coord");
GLuint locPositionAttrib = glGetAttribLocation(mProgramHandle, "in_position");
GLuint locNormalAttrib = glGetAttribLocation(mProgramHandle, "in_normal");
GLuint locColorAttrib = glGetAttribLocation(mProgramHandle, "in_color");
// Generate Buffers.
glGenVertexArrays(1, &mVao);
glGenBuffers(1, &mVbo);
glGenBuffers(1, &mEab);
// Specify VAO.
glBindVertexArray(mVao);
// Upload indices to GPU.
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mEab);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, mNumIndices * sizeof(GLuint), mIndices, GL_STATIC_DRAW);
// Enable/Disable each vertex attribute.
glEnableVertexAttribArray(locPositionAttrib);
if (HasColors())
{
glEnableVertexAttribArray(locColorAttrib);
}
else
{
glDisableVertexAttribArray(locColorAttrib);
}
if (HasNormals())
{
glEnableVertexAttribArray(locNormalAttrib);
}
else
{
glDisableVertexAttribArray(locNormalAttrib);
}
if (HasTexCoord())
{
glEnableVertexAttribArray(locTexCoordAttrib);
}
else
{
glDisableVertexAttribArray(locTexCoordAttrib);
}
// Upload vertices to GPU.
glBindBuffer(GL_ARRAY_BUFFER, mVbo);
glBufferData(GL_ARRAY_BUFFER, mVertexSize * mNumVertices * sizeof(GLfloat), mVertices, GL_STATIC_DRAW);
if (mStorageType == kTightlyPacked)
{
GLfloat stride = sizeof(GLfloat) * mVertexSize;
glVertexAttribPointer(locPositionAttrib, 3, GL_FLOAT, GL_FALSE, stride, 0);
glVertexAttribPointer(locColorAttrib, 3, GL_FLOAT, GL_FALSE, stride,
(void*)(sizeof(GLfloat) * 3));
glVertexAttribPointer(locNormalAttrib, 3, GL_FLOAT, GL_FALSE, stride,
(void*)(sizeof(GLfloat) * (3 + 3*mHasColors)));
glVertexAttribPointer(locTexCoordAttrib, 2, GL_FLOAT, GL_FALSE, stride,
(void*)(sizeof(GLfloat) * (3 + 3*mHasColors + 3*mHasNormals)) );
}
else // Sub buffered storage type.
{
glVertexAttribPointer(locPositionAttrib, 3, GL_FLOAT, GL_FALSE, 0, 0);
glVertexAttribPointer(locColorAttrib, 3, GL_FLOAT, GL_FALSE, 0,
(void*)(sizeof(GLfloat) * 3*mNumVertices));
glVertexAttribPointer(locNormalAttrib, 3, GL_FLOAT, GL_FALSE, 0,
(void*)(sizeof(GLfloat) * (3 + 3*mHasColors)*mNumVertices));
glVertexAttribPointer(locTexCoordAttrib, 2, GL_FLOAT, GL_FALSE, 0,
(void*)(sizeof(GLfloat) * (3 + 3*mHasColors + 3*mHasNormals)*mNumVertices));
}
}
// 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};
}
// Reloads the geometry. To keep some data constant, just specify nullptr.
void Mesh::Reload(const GLfloat* positions,
const GLfloat* colors,
const GLfloat* normals,
const GLfloat* texCoords
)
{
if (!mInitialized)
{
std::cerr << "ERROR The mesh must be initialized before creating buffer objects.\n";
return;
}
if (mStorageType == kTightlyPacked)
{
for (int i = 0; i < mNumVertices; i++)
{
float* position = PositionAt(i);
float* texCoord = TexCoordAt(i);
float* normal = NormalAt(i);
float* color = ColorAt(i);
if (positions)
{
memcpy(position, positions + 3*i, sizeof(GLfloat)*3);
}
if (colors && HasColors())
{
memcpy(color, colors + 3*i, sizeof(GLfloat)*3);
}
if (normals && HasNormals())
{
memcpy(normal, normals + 3*i, sizeof(GLfloat)*3);
}
if (texCoords && HasTexCoord())
{
memcpy(texCoord, texCoords + 2*i, sizeof(GLfloat)*2);
}
}
}
else // Sub-buffered.
{
GLfloat* dest = mVertices;
if (positions)
{
memcpy(dest, positions, 3*sizeof(GLfloat)*mNumVertices);
dest += 3*mNumVertices;
}
if (colors && HasColors())
{
memcpy(dest, colors, 3*sizeof(GLfloat)*mNumVertices);
dest += 3*mNumVertices;
}
if (normals && HasNormals())
{
memcpy(dest, normals, 3*sizeof(GLfloat)*mNumVertices);
dest += 3*mNumVertices;
}
if (texCoords && HasTexCoord())
{
memcpy(dest, texCoords, 2*sizeof(GLfloat)*mNumVertices);
dest += 2*mNumVertices;
}
}
Mesh::Upload();
}
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);
}
