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Initial commit, all code samples with working CMake script for VS/Windows.

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Joey de Vries
2015-03-23 15:42:04 +01:00
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133
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#pragma once
// Std. Includes
#include <vector>
// GL Includes
#include <GL\glew.h>
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
// Defines several possible options for camera movement. Used as abstraction to stay away from window-system specific input methods
enum Camera_Movement {
FORWARD,
BACKWARD,
LEFT,
RIGHT
};
// Default camera values
const GLfloat YAW = -90.0f;
const GLfloat PITCH = 0.0f;
const GLfloat SPEED = 3.0f;
const GLfloat SENSITIVTY = 0.25f;
const GLfloat ZOOM = 45.0f;
// An abstract camera class that processes input and calculates the corresponding Eular Angles, Vectors and Matrices for use in OpenGL
class Camera
{
public:
// Camera Attributes
glm::vec3 Position;
glm::vec3 Front;
glm::vec3 Up;
glm::vec3 Right;
glm::vec3 WorldUp;
// Eular Angles
GLfloat Yaw;
GLfloat Pitch;
// Camera options
GLfloat MovementSpeed;
GLfloat MouseSensitivity;
GLfloat Zoom;
// Constructor with vectors
Camera(glm::vec3 position = glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3 up = glm::vec3(0.0f, 1.0f, 0.0f), GLfloat yaw = YAW, GLfloat pitch = PITCH) : Front(glm::vec3(0.0f, 0.0f, -1.0f)), MovementSpeed(SPEED), MouseSensitivity(SENSITIVTY), Zoom(ZOOM)
{
this->Position = position;
this->WorldUp = up;
this->Yaw = yaw;
this->Pitch = pitch;
this->updateCameraVectors();
}
// Constructor with scalar values
Camera(GLfloat posX, GLfloat posY, GLfloat posZ, GLfloat upX, GLfloat upY, GLfloat upZ, GLfloat yaw, GLfloat pitch) : Front(glm::vec3(0.0f, 0.0f, -1.0f)), MovementSpeed(SPEED), MouseSensitivity(SENSITIVTY), Zoom(ZOOM)
{
this->Position = glm::vec3(posX, posY, posZ);
this->WorldUp = glm::vec3(upX, upY, upZ);
this->Yaw = yaw;
this->Pitch = pitch;
this->updateCameraVectors();
}
// Returns the view matrix calculated using Eular Angles and the LookAt Matrix
glm::mat4 GetViewMatrix()
{
return glm::lookAt(this->Position, this->Position + this->Front, this->Up);
}
// Processes input received from any keyboard-like input system. Accepts input parameter in the form of camera defined ENUM (to abstract it from windowing systems)
void ProcessKeyboard(Camera_Movement direction, GLfloat deltaTime)
{
GLfloat velocity = this->MovementSpeed * deltaTime;
if (direction == FORWARD)
this->Position += this->Front * velocity;
if (direction == BACKWARD)
this->Position -= this->Front * velocity;
if (direction == LEFT)
this->Position -= this->Right * velocity;
if (direction == RIGHT)
this->Position += this->Right * velocity;
}
// Processes input received from a mouse input system. Expects the offset value in both the x and y direction.
void ProcessMouseMovement(GLfloat xoffset, GLfloat yoffset, GLboolean constrainPitch = true)
{
xoffset *= this->MouseSensitivity;
yoffset *= this->MouseSensitivity;
this->Yaw += xoffset;
this->Pitch += yoffset;
// Make sure that when pitch is out of bounds, screen doesn't get flipped
if (constrainPitch)
{
if (this->Pitch > 89.0f)
this->Pitch = 89.0f;
if (this->Pitch < -89.0f)
this->Pitch = -89.0f;
}
// Update Front, Right and Up Vectors using the updated Eular angles
this->updateCameraVectors();
}
// Processes input received from a mouse scroll-wheel event. Only requires input on the vertical wheel-axis
void ProcessMouseScroll(GLfloat yoffset)
{
if (this->Zoom >= 1.0f && this->Zoom <= 45.0f)
this->Zoom -= yoffset;
if (this->Zoom <= 1.0f)
this->Zoom = 1.0f;
if (this->Zoom >= 45.0f)
this->Zoom = 45.0f;
}
private:
// Calculates the front vector from the Camera's (updated) Eular Angles
void updateCameraVectors()
{
// Calculate the new Front vector
glm::vec3 front;
front.x = cos(glm::radians(this->Yaw)) * cos(glm::radians(this->Pitch));
front.y = sin(glm::radians(this->Pitch));
front.z = sin(glm::radians(this->Yaw)) * cos(glm::radians(this->Pitch));
this->Front = glm::normalize(front);
// Also re-calculate the Right and Up vector
this->Right = glm::normalize(glm::cross(this->Front, this->WorldUp)); // Normalize the vectors, because their length gets closer to 0 the more you look up or down which results in slower movement.
this->Up = glm::normalize(glm::cross(this->Right, this->Front));
}
};

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#pragma once
// Std. Includes
#include <string>
#include <fstream>
#include <sstream>
#include <iostream>
#include <vector>
using namespace std;
// GL Includes
#include <GL/glew.h> // Contains all the necessery OpenGL includes
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
struct Vertex {
// Position
glm::vec3 Position;
// Normal
glm::vec3 Normal;
// TexCoords
glm::vec2 TexCoords;
};
struct Texture {
GLuint id;
string type;
aiString path;
};
class Mesh {
public:
/* Mesh Data */
vector<Vertex> vertices;
vector<GLuint> indices;
vector<Texture> textures;
GLuint VAO;
/* Functions */
// Constructor
Mesh(vector<Vertex> vertices, vector<GLuint> indices, vector<Texture> textures)
{
this->vertices = vertices;
this->indices = indices;
this->textures = textures;
// Now that we have all the required data, set the vertex buffers and its attribute pointers.
this->setupMesh();
}
// Render the mesh
void Draw(Shader shader)
{
// Bind appropriate textures
GLuint diffuseNr = 1;
GLuint specularNr = 1;
for(GLuint i = 0; i < this->textures.size(); i++)
{
glActiveTexture(GL_TEXTURE0 + i); // Active proper texture unit before binding
// Retrieve texture number (the N in diffuse_textureN)
stringstream ss;
string number;
string name = this->textures[i].type;
if(name == "texture_diffuse")
ss << diffuseNr++; // Transfer GLuint to stream
else if(name == "texture_specular")
ss << specularNr++; // Transfer GLuint to stream
number = ss.str();
// Now set the sampler to the correct texture unit
glUniform1f(glGetUniformLocation(shader.Program, (name + number).c_str()), i);
// And finally bind the texture
glBindTexture(GL_TEXTURE_2D, this->textures[i].id);
}
// Draw mesh
glBindVertexArray(this->VAO);
glDrawElements(GL_TRIANGLES, this->indices.size(), GL_UNSIGNED_INT, 0);
glBindVertexArray(0);
// Always good practice to set everything back to defaults once configured.
for (GLuint i = 0; i < this->textures.size(); i++)
{
glActiveTexture(GL_TEXTURE0 + i);
glBindTexture(GL_TEXTURE_2D, 0);
}
}
private:
/* Render data */
GLuint VBO, EBO;
/* Functions */
// Initializes all the buffer objects/arrays
void setupMesh()
{
// Create buffers/arrays
glGenVertexArrays(1, &this->VAO);
glGenBuffers(1, &this->VBO);
glGenBuffers(1, &this->EBO);
glBindVertexArray(this->VAO);
// Load data into vertex buffers
glBindBuffer(GL_ARRAY_BUFFER, this->VBO);
// A great thing about structs is that their memory layout is sequential for all its items.
// The effect is that we can simply pass a pointer to the struct and it translates perfectly to a glm::vec3/2 array which
// again translates to 3/2 floats which translates to a byte array.
glBufferData(GL_ARRAY_BUFFER, this->vertices.size() * sizeof(Vertex), &this->vertices[0], GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, this->EBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, this->indices.size() * sizeof(GLuint), &this->indices[0], GL_STATIC_DRAW);
// Set the vertex attribute pointers
// Vertex Positions
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*)0);
// Vertex Normals
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*)offsetof(Vertex, Normal));
// Vertex Texture Coords
glEnableVertexAttribArray(2);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*)offsetof(Vertex, TexCoords));
glBindVertexArray(0);
}
};

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#pragma once
// Std. Includes
#include <string>
#include <fstream>
#include <sstream>
#include <iostream>
#include <map>
#include <vector>
using namespace std;
// GL Includes
#include <GL/glew.h> // Contains all the necessery OpenGL includes
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <SOIL.h>
#include <assimp/Importer.hpp>
#include <assimp/scene.h>
#include <assimp/postprocess.h>
#include "Mesh.h"
GLint TextureFromFile(const char* path, string directory);
class Model
{
public:
/* Model Data */
vector<Texture> textures_loaded; // Stores all the textures loaded so far, optimization to make sure textures aren't loaded more than once.
vector<Mesh> meshes;
string directory;
/* Functions */
// Constructor, expects a filepath to a 3D model.
Model(GLchar* path)
{
this->loadModel(path);
}
// Draws the model, and thus all its meshes
void Draw(Shader shader)
{
for(GLuint i = 0; i < this->meshes.size(); i++)
this->meshes[i].Draw(shader);
}
private:
/* Functions */
// Loads a model with supported ASSIMP extensions from file and stores the resulting meshes in the meshes vector.
void loadModel(string path)
{
// Read file via ASSIMP
Assimp::Importer importer;
const aiScene* scene = importer.ReadFile(path, aiProcess_Triangulate | aiProcess_FlipUVs);
// Check for errors
if(!scene || scene->mFlags == AI_SCENE_FLAGS_INCOMPLETE || !scene->mRootNode) // if is Not Zero
{
cout << "ERROR::ASSIMP:: " << importer.GetErrorString() << endl;
return;
}
// Retrieve the directory path of the filepath
this->directory = path.substr(0, path.find_last_of('/'));
// Process ASSIMP's root node recursively
this->processNode(scene->mRootNode, scene);
}
// Processes a node in a recursive fashion. Processes each individual mesh located at the node and repeats this process on its children nodes (if any).
void processNode(aiNode* node, const aiScene* scene)
{
// Process each mesh located at the current node
for(GLuint i = 0; i < node->mNumMeshes; i++)
{
// The node object only contains indices to index the actual objects in the scene.
// The scene contains all the data, node is just to keep stuff organized (like relations between nodes).
aiMesh* mesh = scene->mMeshes[node->mMeshes[i]];
this->meshes.push_back(this->processMesh(mesh, scene));
}
// After we've processed all of the meshes (if any) we then recursively process each of the children nodes
for(GLuint i = 0; i < node->mNumChildren; i++)
{
this->processNode(node->mChildren[i], scene);
}
}
Mesh processMesh(aiMesh* mesh, const aiScene* scene)
{
// Data to fill
vector<Vertex> vertices;
vector<GLuint> indices;
vector<Texture> textures;
// Walk through each of the mesh's vertices
for(GLuint i = 0; i < mesh->mNumVertices; i++)
{
Vertex vertex;
glm::vec3 vector; // We declare a placeholder vector since assimp uses its own vector class that doesn't directly convert to glm's vec3 class so we transfer the data to this placeholder glm::vec3 first.
// Positions
vector.x = mesh->mVertices[i].x;
vector.y = mesh->mVertices[i].y;
vector.z = mesh->mVertices[i].z;
vertex.Position = vector;
// Normals
vector.x = mesh->mNormals[i].x;
vector.y = mesh->mNormals[i].y;
vector.z = mesh->mNormals[i].z;
vertex.Normal = vector;
// Texture Coordinates
if(mesh->mTextureCoords[0]) // Does the mesh contain texture coordinates?
{
glm::vec2 vec;
// A vertex can contain up to 8 different texture coordinates. We thus make the assumption that we won't
// use models where a vertex can have multiple texture coordinates so we always take the first set (0).
vec.x = mesh->mTextureCoords[0][i].x;
vec.y = mesh->mTextureCoords[0][i].y;
vertex.TexCoords = vec;
}
else
vertex.TexCoords = glm::vec2(0.0f, 0.0f);
vertices.push_back(vertex);
}
// Now wak through each of the mesh's faces (a face is a mesh its triangle) and retrieve the corresponding vertex indices.
for(GLuint i = 0; i < mesh->mNumFaces; i++)
{
aiFace face = mesh->mFaces[i];
// Retrieve all indices of the face and store them in the indices vector
for(GLuint j = 0; j < face.mNumIndices; j++)
indices.push_back(face.mIndices[j]);
}
// Process materials
if(mesh->mMaterialIndex >= 0)
{
aiMaterial* material = scene->mMaterials[mesh->mMaterialIndex];
// We assume a convention for sampler names in the shaders. Each diffuse texture should be named
// as 'texture_diffuseN' where N is a sequential number ranging from 1 to MAX_SAMPLER_NUMBER.
// Same applies to other texture as the following list summarizes:
// Diffuse: texture_diffuseN
// Specular: texture_specularN
// Normal: texture_normalN
// 1. Diffuse maps
vector<Texture> diffuseMaps = this->loadMaterialTextures(material, aiTextureType_DIFFUSE, "texture_diffuse");
textures.insert(textures.end(), diffuseMaps.begin(), diffuseMaps.end());
// 2. Specular maps
vector<Texture> specularMaps = this->loadMaterialTextures(material, aiTextureType_SPECULAR, "texture_specular");
textures.insert(textures.end(), specularMaps.begin(), specularMaps.end());
}
// Return a mesh object created from the extracted mesh data
return Mesh(vertices, indices, textures);
}
// Checks all material textures of a given type and loads the textures if they're not loaded yet.
// The required info is returned as a Texture struct.
vector<Texture> loadMaterialTextures(aiMaterial* mat, aiTextureType type, string typeName)
{
vector<Texture> textures;
for(GLuint i = 0; i < mat->GetTextureCount(type); i++)
{
aiString str;
mat->GetTexture(type, i, &str);
// Check if texture was loaded before and if so, continue to next iteration: skip loading a new texture
GLboolean skip = false;
for(GLuint j = 0; j < textures_loaded.size(); j++)
{
if(textures_loaded[j].path == str)
{
textures.push_back(textures_loaded[j]);
skip = true; // A texture with the same filepath has already been loaded, continue to next one. (optimization)
break;
}
}
if(!skip)
{ // If texture hasn't been loaded already, load it
Texture texture;
texture.id = TextureFromFile(str.C_Str(), this->directory);
texture.type = typeName;
texture.path = str;
textures.push_back(texture);
this->textures_loaded.push_back(texture); // Store it as texture loaded for entire model, to ensure we won't unnecesery load duplicate textures.
}
}
return textures;
}
};
GLint TextureFromFile(const char* path, string directory)
{
//Generate texture ID and load texture data
string filename = string(path);
filename = directory + '/' + filename;
GLuint textureID;
glGenTextures(1, &textureID);
int width,height;
unsigned char* image = SOIL_load_image(filename.c_str(), &width, &height, 0, SOIL_LOAD_RGB);
// Assign texture to ID
glBindTexture(GL_TEXTURE_2D, textureID);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
glGenerateMipmap(GL_TEXTURE_2D);
// Parameters
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glBindTexture(GL_TEXTURE_2D, 0);
SOIL_free_image_data(image);
return textureID;
}

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#ifndef SHADER_H
#define SHADER_H
#include <GL/glew.h>
#include <string>
#include <fstream>
#include <sstream>
#include <iostream>
class Shader
{
public:
GLuint Program;
// Constructor generates the shader on the fly
Shader(const GLchar* vertexPath, const GLchar* fragmentPath, const GLchar* geometryPath = nullptr)
{
// 1. Retrieve the vertex/fragment source code from filePath
std::string vertexCode;
std::string fragmentCode;
std::string geometryCode;
try
{
// Open files
std::ifstream vShaderFile(vertexPath);
std::ifstream fShaderFile(fragmentPath);
std::stringstream vShaderStream, fShaderStream;
// Read file's buffer contents into streams
vShaderStream << vShaderFile.rdbuf();
fShaderStream << fShaderFile.rdbuf();
// close file handlers
vShaderFile.close();
fShaderFile.close();
// Convert stream into string
vertexCode = vShaderStream.str();
fragmentCode = fShaderStream.str();
// If geometry shader path is present, also load a geometry shader
if(geometryPath != nullptr)
{
std::ifstream gShaderFile(geometryPath);
std::stringstream gShaderStream;
gShaderStream << gShaderFile.rdbuf();
gShaderFile.close();
geometryCode = gShaderStream.str();
}
}
catch (std::exception e)
{
std::cout << "ERROR::SHADER::FILE_NOT_SUCCESFULLY_READ" << std::endl;
}
const GLchar* vShaderCode = vertexCode.c_str();
const GLchar * fShaderCode = fragmentCode.c_str();
// 2. Compile shaders
GLuint vertex, fragment;
GLint success;
GLchar infoLog[512];
// Vertex Shader
vertex = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertex, 1, &vShaderCode, NULL);
glCompileShader(vertex);
checkCompileErrors(vertex, "VERTEX");
// Fragment Shader
fragment = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragment, 1, &fShaderCode, NULL);
glCompileShader(fragment);
checkCompileErrors(fragment, "FRAGMENT");
// If geometry shader is given, compile geometry shader
GLuint geometry;
if(geometryPath != nullptr)
{
const GLchar * gShaderCode = geometryCode.c_str();
geometry = glCreateShader(GL_GEOMETRY_SHADER);
glShaderSource(geometry, 1, &gShaderCode, NULL);
glCompileShader(geometry);
checkCompileErrors(geometry, "GEOMETRY");
}
// Shader Program
this->Program = glCreateProgram();
glAttachShader(this->Program, vertex);
glAttachShader(this->Program, fragment);
if(geometryPath != nullptr)
glAttachShader(this->Program, geometry);
glLinkProgram(this->Program);
checkCompileErrors(this->Program, "PROGRAM");
// Delete the shaders as they're linked into our program now and no longer necessery
glDeleteShader(vertex);
glDeleteShader(fragment);
if(geometryPath != nullptr)
glDeleteShader(geometry);
}
// Uses the current shader
void Use() { glUseProgram(this->Program); }
private:
void checkCompileErrors(GLuint shader, std::string type)
{
GLint success;
GLchar infoLog[1024];
if(type != "PROGRAM")
{
glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
if(!success)
{
glGetShaderInfoLog(shader, 1024, NULL, infoLog);
std::cout << "| ERROR::::SHADER-COMPILATION-ERROR of type: " << type << "|\n" << infoLog << "\n| -- --------------------------------------------------- -- |" << std::endl;
}
}
else
{
glGetProgramiv(shader, GL_LINK_STATUS, &success);
if(!success)
{
glGetProgramInfoLog(shader, 1024, NULL, infoLog);
std::cout << "| ERROR::::PROGRAM-LINKING-ERROR of type: " << type << "|\n" << infoLog << "\n| -- --------------------------------------------------- -- |" << std::endl;
}
}
}
};
#endif