[SOLVED] CS // Toon shading

// Toon shading

#include headers.h
#include linalg.h
#include wavefront.h
#include renderer.h
#include gpuProgram.h
#include font.h

GLFWwindow *window;
wfModel*obj;// the object
Renderer *renderer; // class to do multipass rendering

float theta = 0;
bool sleeping = false;

GLuint windowWidth = 600;
GLuint windowHeight = 400;
float factor = 0;

float fovy;
vec3 eyePosition;

bool isTorso = false; // for torso.obj model, which uses a different projection matrix

void GLFWErrorCallback( int error, const char* description )

{
char *errorString;

switch (error) {
case GLFW_API_UNAVAILABLE:
errorString = GLFW_API_UNAVAILABLE;
break;
case GLFW_FORMAT_UNAVAILABLE:
errorString = GLFW_FORMAT_UNAVAILABLE;
break;
case GLFW_INVALID_ENUM:
errorString = GLFW_INVALID_ENUM;
break;
case GLFW_INVALID_VALUE:
errorString = GLFW_INVALID_VALUE;
break;
case GLFW_NO_CURRENT_CONTEXT:
errorString = GLFW_NO_CURRENT_CONTEXT;
break;
case GLFW_NOT_INITIALIZED:
errorString = GLFW_NOT_INITIALIZED;
break;
case GLFW_OUT_OF_MEMORY:
errorString = GLFW_OUT_OF_MEMORY;
break;
case GLFW_PLATFORM_ERROR:
errorString = GLFW_PLATFORM_ERROR;
break;
case GLFW_VERSION_UNAVAILABLE:
errorString = GLFW_VERSION_UNAVAILABLE;
break;
default:
errorString = UNKNOWN;
}

cerr << “Error ” << errorString << ” (” << error << “): ” << description << endl;exit(1);}void display(){glClearColor( 1, 1, 1, 1 );glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );// OCS-to-WCSmat4 M;if (isTorso)M = rotate( theta, vec3(0,1,0) )* rotate( -3.14159/2.0, vec3(1,0,0) )* translate( -1 * obj->centre );
else
M = rotate( theta, vec3(0.5,2,0) )
* translate( -1 * obj->centre );

// model-view transform (i.e. OCS-to-VCS)

mat4 MV = translate( -1 * eyePosition )
* M;

// model-view-projection transform (i.e. OCS-to-CCS)

float n = (eyePosition obj->centre).length() obj->radius;
float f = (eyePosition obj->centre).length() + obj->radius;

mat4 MVP = perspective( fovy, windowWidth / (float) windowHeight, n, f )
* MV;

// Light direction in VCS is above, to the right, and behind the
// eye.Thats in direction (1,1,1) since the view direction is
// down the -z axis.

vec3 lightDir(1,1,0.2);
lightDir = lightDir.normalize();

// Draw the objects

renderer->render( obj, M, MV, MVP, lightDir );

// Output status message

char buffer[1000];
renderer->makeStatusMessage( buffer );

render_text( buffer, 10, 10, window );
}

// Reshape the window

void windowSizeCallback( GLFWwindow* window, int width, int height )

{
windowWidth = width;
windowHeight = height;
glViewport( 0, 0, width, height );
renderer->reshape( width, height, window );
}

// Handle a key press

void keyCallback( GLFWwindow* window, int key, int scancode, int action, int mods )

{
if (action == GLFW_PRESS || action == GLFW_REPEAT)
switch (key) {
case GLFW_KEY_ESCAPE:
exit(0);
case P:
sleeping = !sleeping;
break;
case D:
renderer->incDebug();
if (renderer->debug == 0)
cout << “Showing dummy (pass-through) output” << endl;elsecout << “Showing pass ” << renderer->debug << ” output” << endl;break;case ‘F’:if (mods & GLFW_MOD_SHIFT)factor += 0.01; // uppercase Felsefactor -= 0.01; // lowercase f cout << “factor = ” << factor << endl;break;case GLFW_KEY_UP:eyePosition = (1/1.1) * eyePosition;break;case GLFW_KEY_DOWN:eyePosition = 1.1 * eyePosition;break;case GLFW_KEY_LEFT:fovy *= 1.1;break;case GLFW_KEY_RIGHT:fovy /= 1.1;break;case GLFW_KEY_SLASH: // also a question markcout << “p – pause” << endl << “d – cycle debug views” << endl << “F – increase factor” << endl << “f – decrease factor” << endl << “up- move farther” << endl << “down- move closer” << endl << “left- zoom out” << endl << “right – zoom in” << endl;}}// Error callbackvoid errorCallback( int error, const char* description ){cerr << “Error ” << error << “: ” << description << endl;exit(1);}// Main programint main( int argc, char **argv ){if (argc < 2) {cerr << “Usage: ” << argv[0] << ” scene.obj” << endl;exit(1);}// Set up GLFWif (!glfwInit()) {cerr << “GLFW failed to initialize” << endl;return 1;}glfwSetErrorCallback( errorCallback );// Open window (ask for OpenGL ES 3.0 or better)#ifdef MACOS// glfwWindowHint( GLFW_CLIENT_API, GLFW_OPENGL_API );glfwWindowHint( GLFW_CONTEXT_VERSION_MAJOR, 3 );glfwWindowHint( GLFW_CONTEXT_VERSION_MINOR, 3 );glfwWindowHint( GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE );glfwWindowHint( GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE );#elseglfwWindowHint( GLFW_CLIENT_API, GLFW_OPENGL_ES_API );glfwWindowHint( GLFW_CONTEXT_VERSION_MAJOR, 3 );glfwWindowHint( GLFW_CONTEXT_VERSION_MINOR, 0 );#endif// Set up the windowwindow = glfwCreateWindow( windowWidth, windowHeight, “toon shading”, NULL, NULL);if (!window) {glfwTerminate();#ifdef MACOSconst char *descrip;int code = glfwGetError( &descrip );cerr << “GLFW code:” << code << endl;cerr << “GLFW error: ” << descrip << endl;#endifreturn 1;}glfwMakeContextCurrent( window );glfwSwapInterval( 1 );gladLoadGLLoader( (GLADloadproc) glfwGetProcAddress );glfwSetKeyCallback( window, keyCallback );glfwSetWindowSizeCallback( window, windowSizeCallback );// CWD is directory abovechdir( “..” );// Init fontsinitFont( “src/FreeSans.ttf”, 20 ); // 20 = font height in pixels// Set up world objectsobj = new wfModel( argv[1], MIPMAP_LINEAR );isTorso = (strlen(argv[1]) >= 9 && strcmp( &argv[1][strlen(argv[1])-9] , torso.obj ) == 0);

// Point camera to the model

const float initEyeDistance = 5.0;

eyePosition = (initEyeDistance * obj->radius) * vec3(0,0,1);
fovy = 2 * atan2( 1, initEyeDistance );

// Set up renderer

renderer = new Renderer( windowWidth, windowHeight, window );

// Main loop

struct timeb prevTime, thisTime; // record the last rendering time
ftime( &prevTime );

glEnable( GL_DEPTH_TEST );

while (!glfwWindowShouldClose( window )) {

// Find elapsed time since last render

ftime( &thisTime );
float elapsedSeconds = (thisTime.time + thisTime.millitm / 1000.0) (prevTime.time + prevTime.millitm / 1000.0);
prevTime = thisTime;

// Update the world state

if (!sleeping)
theta += elapsedSeconds * 0.3;

// Clear, display, and check for events

glClearColor( 1, 1, 1, 1 );
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // also clear depth buffer

display();

glfwSwapBuffers( window );
glfwPollEvents();
}

// Clean up

glfwDestroyWindow( window );
glfwTerminate();

return 0;
}