// Ambient.c
// OpenGL SuperBible, Chapter 6
// Beginning of OpenGL lighting sample
// Demonstrates Ambient Lighting
// Program by Richard S. Wright Jr.

#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glut.h>
#include <math.h>


// Define a constant for the value of PI
#define GL_PI 3.1415f

// Rotation amounts
static GLfloat xRot = 0.0f;
static GLfloat yRot = 0.0f;


// Called to draw scene
void RenderScene(void)
	{
	// Clear the window with current clearing color
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	// Save the matrix state
	glPushMatrix();
	glRotatef(xRot, 1.0f, 0.0f, 0.0f);
	glRotatef(yRot, 0.0f, 1.0f, 0.0f);

	// Nose Cone /////////////////////////////
	// Bright Green
	glColor3ub(0, 255, 0);
	glBegin(GL_TRIANGLES);
		glVertex3f(0.0f, 0.0f, 60.0f);
		glVertex3f(-15.0f, 0.0f, 30.0f);
		glVertex3f(15.0f,0.0f,30.0f);

		glVertex3f(15.0f,0.0f,30.0f);
		glVertex3f(0.0f, 15.0f, 30.0f);
		glVertex3f(0.0f, 0.0f, 60.0f);

		glVertex3f(0.0f, 0.0f, 60.0f);
		glVertex3f(0.0f, 15.0f, 30.0f);
		glVertex3f(-15.0f,0.0f,30.0f);

	// Body of the Plane ////////////////////////
	// light gray
		glColor3ub(192,192,192);
		glVertex3f(-15.0f,0.0f,30.0f);
		glVertex3f(0.0f, 15.0f, 30.0f);
		glVertex3f(0.0f, 0.0f, -56.0f);

		glVertex3f(0.0f, 0.0f, -56.0f);
		glVertex3f(0.0f, 15.0f, 30.0f);
		glVertex3f(15.0f,0.0f,30.0f);	
	
		glVertex3f(15.0f,0.0f,30.0f);
		glVertex3f(-15.0f, 0.0f, 30.0f);
		glVertex3f(0.0f, 0.0f, -56.0f);


	///////////////////////////////////////////////
	// Left wing
	// Dark gray
		glColor3ub(64,64,64);
		glVertex3f(0.0f,2.0f,27.0f);
		glVertex3f(-60.0f, 2.0f, -8.0f);
		glVertex3f(60.0f, 2.0f, -8.0f);
	
		glVertex3f(60.0f, 2.0f, -8.0f);
		glVertex3f(0.0f, 7.0f, -8.0f);
		glVertex3f(0.0f,2.0f,27.0f);
	
		glVertex3f(60.0f, 2.0f, -8.0f);
		glVertex3f(-60.0f, 2.0f, -8.0f);
		glVertex3f(0.0f,7.0f,-8.0f);


	// Other wing top section
		glVertex3f(0.0f,2.0f,27.0f);
		glVertex3f(0.0f, 7.0f, -8.0f);
		glVertex3f(-60.0f, 2.0f, -8.0f);

	// Tail section///////////////////////////////
	// Bottom of back fin
	glColor3ub(255,255,0);
		glVertex3f(-30.0f, -0.50f, -57.0f);
		glVertex3f(30.0f, -0.50f, -57.0f);
		glVertex3f(0.0f,-0.50f,-40.0f);

	// top of left side
		glVertex3f(0.0f,-0.5f,-40.0f);
		glVertex3f(30.0f, -0.5f, -57.0f);
		glVertex3f(0.0f, 4.0f, -57.0f);

	// top of right side
		glVertex3f(0.0f, 4.0f, -57.0f);
		glVertex3f(-30.0f, -0.5f, -57.0f);
		glVertex3f(0.0f,-0.5f,-40.0f);

	// back of bottom of tail
		glVertex3f(30.0f,-0.5f,-57.0f);
		glVertex3f(-30.0f, -0.5f, -57.0f);
		glVertex3f(0.0f, 4.0f, -57.0f);


	// Top of Tail section left
	glColor3ub(255,0,0);
		glVertex3f(0.0f,0.5f,-40.0f);
		glVertex3f(3.0f, 0.5f, -57.0f);
		glVertex3f(0.0f, 25.0f, -65.0f);

		glVertex3f(0.0f, 25.0f, -65.0f);
		glVertex3f(-3.0f, 0.5f, -57.0f);
		glVertex3f(0.0f,0.5f,-40.0f);


	// Back of horizontal section
		glVertex3f(3.0f,0.5f,-57.0f);
		glVertex3f(-3.0f, 0.5f, -57.0f);
		glVertex3f(0.0f, 25.0f, -65.0f);
	glEnd();

	glPopMatrix();

	// Display the results
	glutSwapBuffers();
	}

// This function does any needed initialization on the rendering
// context. 
void SetupRC()
	{
	// Light values
	// Bright white light
	GLfloat ambientLight[] = { 1.0f, 1.0f, 1.0f, 1.0f };

	glEnable(GL_DEPTH_TEST);	// Hidden surface removal
	glEnable(GL_CULL_FACE);		// Do not calculate inside of jet
	glFrontFace(GL_CCW);		// Counter clock-wise polygons face out

	// Lighting stuff
	glEnable(GL_LIGHTING);			// Enable lighting	

	// Set light model to use ambient light specified by ambientLight
	glLightModelfv(GL_LIGHT_MODEL_AMBIENT,ambientLight);


	glEnable(GL_COLOR_MATERIAL);	// Enable Material color tracking

	// Front material ambient and diffuse colors track glColor
	glColorMaterial(GL_FRONT,GL_AMBIENT_AND_DIFFUSE);

	// Nice light blue
	glClearColor(0.0f, 0.0f, 05.f,1.0f);
	}

void SpecialKeys(int key, int x, int y)
	{
	if(key == GLUT_KEY_UP)
		xRot-= 5.0f;

	if(key == GLUT_KEY_DOWN)
		xRot += 5.0f;

	if(key == GLUT_KEY_LEFT)
		yRot -= 5.0f;

	if(key == GLUT_KEY_RIGHT)
		yRot += 5.0f;

	if(xRot > 356.0f)
		xRot = 0.0f;

	if(xRot < -1.0f)
		xRot = 355.0f;

	if(yRot > 356.0f)
		yRot = 0.0f;

	if(yRot < -1.0f)
		yRot = 355.0f;

	// Refresh the Window
	glutPostRedisplay();
	}


void ChangeSize(int w, int h)
	{
	GLfloat nRange = 80.0f;
	// Prevent a divide by zero
	if(h == 0)
		h = 1;

	// Set Viewport to window dimensions
    glViewport(0, 0, w, h);

	// Reset coordinate system
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();

	// Establish clipping volume (left, right, bottom, top, near, far)
    if (w <= h) 
		glOrtho (-nRange, nRange, -nRange*h/w, nRange*h/w, -nRange, nRange);
    else 
		glOrtho (-nRange*w/h, nRange*w/h, -nRange, nRange, -nRange, nRange);

	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	}

int main(int argc, char* argv[])
	{
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
	glutCreateWindow("Ambient Light Jet");
	glutReshapeFunc(ChangeSize);
	glutSpecialFunc(SpecialKeys);
	glutDisplayFunc(RenderScene);
	SetupRC();
	glutMainLoop();

	return 0;
	}