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CS 330 Practice Activity 9 Guidelines and Rubric Overview In this course, practice activities will help you to learn OpenGL and build computer graphics skills that you will need to complete a successful final project. In Practice Activity 9, you will go beyond the requirement of the final project by animating a textured 3D pyramid. If you have trouble completing the assignment, be sure to post your questions or issues to the Graphics Troubleshooting discussion topic. It is essential to ask for help when you need it and successfully complete each activity, as the course continues to build on earlier learning. Prompt First, read the resource on animating computer animation. Also review the Module Eight Tutorial on animating a 3D cube. You will use similar methods to complete this assignment. Review Tutorial 1-2 for instructions on creating a context. To complete this assignment, start with the code you developed to produce a textured 3D pyramid in Module Six. Add animation code that will allow the pyramid to rotate slowly in the XYZ axes.

* Activity6.cpp

#include <Windows.h>

#include <iostream>

#include <GL/glew.h>

#include <GL/freeglut.h>

//GLM Math Header Inclusions */

#include <glm/glm.hpp>

#include <glm/gtc/matrix_transform.hpp>

#include <glm/gtc/type_ptr.hpp>

using namespace std; // Standard namespace

#define GLSL(Version, Source) “#version ” #Version “n” #Source

#define WINDOW_TITLE “Modern OpenGL”

/* Variable declarations for shader, window size initialization, buffer and array objects*/

GLint shaderProgram, WindowWidth = 800, WindowHeight = 600;

GLuint VBO, VAO;

GLfloat cameraSpeed = 0.0005f; //Movement speed per frame

GLchar currentKey; //Will store key pressed

int keymod; //check for alt

GLfloat scale_by_y=2.0f;

GLfloat scale_by_z=2.0f;

GLfloat scale_by_x=2.0f;

GLfloat lastMouseX = 400, lastMouseY = 300; //locks mouse cursor at the center of the screen

GLfloat mouseXoffset, mouseYoffset , yaw = 0.0f ,pitch = 0.0f; //mouse offset , yaw and pitch variables

GLfloat sensitivity = 0.01f; //used for mouse and camera sensitivity

bool mouseDetected = true; //initially true when mouse is detected

bool rotate = false;

bool checkMotion = false;

bool checkZoom = false;

//Global vector declarations

glm::vec3 CameraPosition = glm::vec3(0.0f, 0.0f, 0.0f); // Initial camera position. Placed units in Z

glm::vec3 CameraUpY = glm::vec3(0.0f, 1.0f, 0.0f); //Temporary y unit vector

glm::vec3 CameraForwardZ = glm::vec3(0.0f, 0.0f, -1.0f); //Temporary z unit vector

glm::vec3 front; //temporary z unit vector for mouse

/*Function prototypes */

void UResizeWindow(int, int);

void URenderGraphics(void);

void UCreateShader(void);

void UCreateBuffers(void);

void UMouseMove(int x , int y);

void OnMouseClicks(int button, int state, int x , int y);

void onMotion(int x, int y);

/* Vector Shader Source Code */

/* Vertex Shader Source Code*/

const GLchar * vertexShaderSource =”#version 400 coren”

// Vertex data from Vertex Attrib Pointer 0

“layout(location = 0) in vec3 position;”

// Color data from Vertex Attrib Pointer 1

“layout(location = 1) in vec3 color;”

//variable to transfer color data to the fragment shader

“out vec3 mobileColor;”

//Global variables for the transform matrices

“uniform mat4 model;”

“uniform mat4 view;”

“uniform mat4 projection;”

“void main()n”

“{n”

// transforms vertices to clip coordinates

“gl_Position = projection * view * model * vec4(position, 1.0f);”

// references incoming color data

“mobileColor = color;”

“}n”;

/* Fragment Shader Source Code*/

const GLchar * fragmentShaderSource =”#version 400 coren”

“in vec3 mobileColor;” // Variable to hold incoming color data from vertex shader

“out vec4 gpuColor;” // Variable to pass color data to the GPU

“void main()n”

“{n”

“gpuColor = vec4(mobileColor, 1.0);” // Sends color data to the GPU for rendering

“}n”;

/* Fragment Shader Source Code */

/* Main Program */

int main(int argc, char* argv[])

{

glutInit(&argc, argv);

glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);

glutInitWindowSize(WindowWidth, WindowHeight);

glutCreateWindow(WINDOW_TITLE);

glutReshapeFunc(UResizeWindow);

glewExperimental = GL_TRUE;

if (glewInit() != GLEW_OK)

{

std::cout << “Failed to initialize GLEW” << std::endl;

return -1;

}

UCreateShader();

UCreateBuffers();

// Use the Shader program

glUseProgram(shaderProgram);

glClearColor(0.0f, 0.0f, 0.0f, 1.0f); // Set background color

glutDisplayFunc(URenderGraphics);

glutPassiveMotionFunc(UMouseMove); // detect mouse move

glutMotionFunc(onMotion);

glutMouseFunc(OnMouseClicks);

glutMainLoop();

// Destroys Buffer objects once used

glDeleteVertexArrays(1, &VAO);

glDeleteBuffers(1, &VBO);

return 0;

}

/* Resizes the Window*/

void UResizeWindow(int w, int h)

{

WindowWidth = w;

WindowHeight = h;

glViewport(0, 0, WindowWidth, WindowHeight);

}

/* Renders graphics */

void URenderGraphics(void)

{

glEnable(GL_DEPTH_TEST); // Enable z-depth

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clears the screen

glBindVertexArray(VAO); // Active the Vertex Array object before rendering and transforming them

//* Create Movement Logic */

CameraForwardZ = front;

// Transforms the Object

glm::mat4 model;

model = glm::translate(model, glm::vec3(0.0f, 0.0f, 0.0f)); // Place the object at the center of the viewport

model = glm::rotate(model, 45.0f, glm::vec3(0.0, 1.0f, 0.0f)); // Rotate the object 45 degrees on the X

model = glm::scale(model, glm::vec3(scale_by_x,scale_by_y,scale_by_z)); // Increase the object size by a scale of 2

//Transforms the camera

glm::mat4 view;

view = glm::lookAt(CameraForwardZ, CameraPosition, CameraUpY);

// Creates a perspective projection

glm::mat4 projection;

projection = glm::perspective(45.0f, (GLfloat)WindowWidth / (GLfloat)WindowHeight, 0.1f, 100.0f);

// Retrieves and passes transform matrices to the Shader program

GLint modelLoc = glGetUniformLocation(shaderProgram, “model”);

GLint viewLoc = glGetUniformLocation(shaderProgram, “view”);

GLint projLoc = glGetUniformLocation(shaderProgram, “projection”);

glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));

glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));

glUniformMatrix4fv(projLoc, 1, GL_FALSE, glm::value_ptr(projection));

glutPostRedisplay();

// Draws the triangles

glDrawArrays(GL_TRIANGLES, 0, 36);

glBindVertexArray(0); // Deactivates the Vertex Array Object

glutSwapBuffers(); // Flips the back buffer with the front buffer every frame

}

/* Creates the Shader program */

void UCreateShader()

{

//Vertex shader

GLint vertexShader = glCreateShader(GL_VERTEX_SHADER); // Creates the Vertex shader

glShaderSource(vertexShader, 1, &vertexShaderSource, NULL); // Attaches the Vertex shader to the source code

glCompileShader(vertexShader); // Compiles the Vertex shader

// Fragment shader

GLint fragmentShader = glCreateShader(GL_FRAGMENT_SHADER); // Creates the Fragment shader

glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL); //Attaches the Fragment shader to the source code

glCompileShader(fragmentShader); // Compiles the Fragment shader

//Shader program

shaderProgram = glCreateProgram(); //Create the Shader program and returns an id

glAttachShader(shaderProgram, vertexShader); //Attach Vertex shader to the Shader program

glAttachShader(shaderProgram, fragmentShader);; // Attach Fragment shader to the shader program

glLinkProgram(shaderProgram); // Link vertex and fragment shader to shader program

//Delete the Vertex and Fragment shaders once linked

glDeleteShader(vertexShader);

glDeleteShader(fragmentShader);

}

void UCreateBuffers()

{

GLfloat vertices[] = {

//Positions //Color

//p1

-0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f,

0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f,

0.5f, 0.5f, -0.5f, 1.0f, 0.0f, 0.0f,

-0.5f, 0.5f, -0.5f, 1.0f, 0.0f, 0.0f,

-0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f,

//p2

-0.5f, -0.5f, 0.5f, 0.0f, 1.0f, 0.0f,

0.5f, -0.5f, 0.5f, 0.0f, 1.0f, 0.0f,

0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f,

-0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f,

-0.5f, -0.5f, 0.5f, 0.0f, 1.0f, 0.0f,

//p3

-0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f,

-0.5f, 0.5f, -0.5f, 0.0f, 0.0f, 1.0f,

-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, 1.0f,

-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f,

-0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f,

//p4

0.5f, 0.5f, 0.5f, 1.0f, 1.0f, 0.0f,

0.5f, 0.5f, -0.5f, 1.0f, 1.0f, 0.0f,

0.5f, -0.5f, -0.5f, 1.0f, 1.0f, 0.0f,

0.5f, -0.5f, 0.5f, 1.0f, 1.0f, 0.0f,

0.5f, 0.5f, 0.5f, 1.0f, 1.0f, 0.0f,

//p5

-0.5f, -0.5f, -0.5f, 0.0f, 1.0f, 1.0f,

0.5f, -0.5f, -0.5f, 0.0f, 1.0f, 1.0f,

0.5f, -0.5f, 0.5f, 0.0f, 1.0f, 1.0f,

-0.5f, -0.5f, 0.5f, 0.0f, 1.0f, 1.0f,

-0.5f, -0.5f, -0.5f, 0.0f, 1.0f, 1.0f,

-0.5f, 0.5f, -0.5f, 1.0f, 0.0f, 1.0f,

0.5f, 0.5f, -0.5f, 1.0f, 0.0f, 1.0f,

0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 1.0f,

-0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 1.0f,

-0.5f, 0.5f, -0.5f, 1.0f, 0.0f, 1.0f,

};

//Generate buffer ids

glGenVertexArrays(1, &VAO);

glGenBuffers(1, &VBO);

// Active the vertex Array object before binding and setting any VBOs and vertex Attribute Pointers

glBindVertexArray(VAO);

// Active the VBO

glBindBuffer(GL_ARRAY_BUFFER, VBO);

glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW); //Copy vertices to VBO

//Set attribute pointer 0 to hold Position data

glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), (GLvoid*)0);

glEnableVertexAttribArray(0); // Enable vertex attribute

//Set attribute pointer 1 to hold Color data

glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));

glEnableVertexAttribArray(1); // Enable vertex attribute

glBindVertexArray(0); // Deactivates the VAO which is good practice

}

void UMouseMove(int x, int y){

front.x = 10.0f * cos(yaw);

front.y = 10.0f * sin(pitch);

front.z = sin(yaw) * cos(pitch) * 10.0f;

}

void onMotion(int curr_x, int curr_y) {

//if left alt and mouse down are set

if(checkMotion){

//gets the direction the mouse was moved

mouseXoffset = curr_x – lastMouseX;

mouseYoffset = lastMouseY – curr_y;

//updates with new mouse coorditaes

lastMouseX = curr_x;

lastMouseY = curr_y;

//Applies sensitivity to mouse direction

mouseXoffset *= sensitivity;

mouseYoffset *= sensitivity;

//get the direction of the mouse

//if there is changes in yaw, then it is moving along X

if(yaw != yaw+mouseXoffset && pitch == pitch+mouseYoffset){

//INCREAMENT yaw

yaw += mouseXoffset;

//else movement in y

}else if(pitch != pitch+mouseYoffset && yaw == yaw+mouseXoffset ){

//increament y to move vertical

pitch += mouseYoffset;

}

front.x = 10.0f * cos(yaw);

front.y = 10.0f * sin(pitch);

front.z = sin(yaw) * cos(pitch) * 10.0f;

}

//check if user is zooming, alt, right mouse button and down

if(checkZoom){

//determine the direction of the , whether up or down

if(lastMouseY > curr_y){

//increament scale values

scale_by_y += 0.1f;

scale_by_x += 0.1f;

scale_by_z += 0.1f;

//redisplay

glutPostRedisplay();

}else{

//decreament scale values, zoom in

scale_by_y -= 0.1f;

scale_by_x -= 0.1f;

scale_by_z -= 0.1f;

//control zoom in size

if(scale_by_y < 0.2f){

scale_by_y = 0.2f;

scale_by_x = 0.2f;

scale_by_z = 0.2f;

}

glutPostRedisplay();

}

//update x and y

lastMouseY = curr_y;

lastMouseX = curr_x;

}

void OnMouseClicks(int button, int state, int x, int y) {

keymod = glutGetModifiers(); // checks for modifier keys like alt, shif and ctrl

checkMotion = false; //set checkMotion to false

//check if button is left, and mod is alt and state is down, all should be true

if(button == GLUT_LEFT_BUTTON && keymod == GLUT_ACTIVE_ALT && state == GLUT_DOWN) {

//if true then set motion true

checkMotion = true;

//zooming to be false

checkZoom = false;

}else if(button == GLUT_RIGHT_BUTTON && keymod == GLUT_ACTIVE_ALT && state == GLUT_DOWN){

//zoom to be true and motion to be false

checkMotion = false;

checkZoom = true;

}

}/*

* Activity6.cpp

* Created on: Aug 7, 2019

* Author: emir.hasanbeg_snhu