glutBasics.c

/*
 *  glutBasics.cpp
 *  GLUTTest
 *
 *  Created by GGS on June 17 2003.
 *  Copyright (c) 2003 Apple. All rights reserved.
 *
 
    Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.
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                please do not use, install, modify or redistribute this Apple software.
 
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                to these terms, Apple grants you a personal, non-exclusive license, under AppleÕs
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                The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO
                WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
                WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
                COMBINATION WITH YOUR PRODUCTS.
 
                IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
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 */
 
#include <string.h>
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
 
#include <GLUT/glut.h>
#include <OpenGL/glext.h>
#include <OpenGL/gl.h>
#include <OpenGL/glu.h>
 
#include "trackball.h"
#include "SurfaceGeometry.h"
 
#define DTOR 0.0174532925
#define CROSSPROD(p1,p2,p3) \
   p3.x = p1.y*p2.z - p1.z*p2.y; \
   p3.y = p1.z*p2.x - p1.x*p2.z; \
   p3.z = p1.x*p2.y - p1.y*p2.x
   
#ifndef MIN
    #define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif
 
enum {
    kTextureSize = 256
};
 
typedef struct {
   GLdouble x,y,z;
} recVec;
 
typedef struct {
    recVec viewPos; // View position
    recVec viewDir; // View direction vector
    recVec viewUp; // View up direction
    recVec rotPoint; // Point to rotate about
    GLdouble focalLength; // Focal Length along view direction
    GLdouble aperture; // gCamera aperture
    GLdouble eyeSep; // Eye separation
    GLint screenWidth,screenHeight; // current window/screen height and width
} recCamera;
 
GLfloat gShapeSize = 11.0f;
 
GLint gDollyPanStartPoint[2] = {0, 0};
GLfloat gTrackBallRotation [4] = {0.0, 0.0, 0.0, 0.0};
GLboolean gDolly = GL_FALSE;
GLboolean gPan = GL_FALSE;
GLboolean gTrackBall = GL_FALSE;
GLfloat gWorldRotation [4] = {155.0, 0.0, -1.0, 0.0};
 
GLboolean gLines = GL_FALSE;
GLboolean gPolygons = GL_TRUE;
 
GLboolean gShowHelp = GL_TRUE;
GLboolean gShowInfo = GL_TRUE;
 
recCamera gCamera;
recVec gOrigin = {0.0, 0.0, 0.0};
 
int gLastKey = ' ';
 
int gMainWindow = 0;
 
GLuint gPointList = NULL;
GLuint gWireList = NULL;
GLuint gSolidList = NULL;
 
#pragma mark ---- gCamera control ----
 
void gCameraReset(void)
{
   gCamera.aperture = 40;
   gCamera.focalLength = 15;
   gCamera.rotPoint = gOrigin;
 
   gCamera.viewPos.x = 0.0;
   gCamera.viewPos.y = 0.0;
   gCamera.viewPos.z = -gCamera.focalLength;
   gCamera.viewDir.x = -gCamera.viewPos.x; 
   gCamera.viewDir.y = -gCamera.viewPos.y; 
   gCamera.viewDir.z = -gCamera.viewPos.z;
 
   gCamera.viewUp.x = 0;  
   gCamera.viewUp.y = 1; 
   gCamera.viewUp.z = 0;
}
 
#pragma mark ---- Utilities ----
 
void
drawGLString(GLfloat x, GLfloat y, char *string)
{
  int len, i;
 
  glRasterPos2f(x, y);
  len = (int) strlen(string);
  for (i = 0; i < len; i++) {
    glutBitmapCharacter(GLUT_BITMAP_HELVETICA_10, string[i]);
  }
}
 
 
#pragma mark ---- Drawing ----
 
 
void SetLighting(unsigned int mode)
{
    GLfloat mat_specular[] = {1.0, 1.0, 1.0, 1.0};
    GLfloat mat_shininess[] = {90.0};
 
    GLfloat position[4] = {7.0,-7.0,12.0,0.0};
    GLfloat ambient[4]  = {0.2,0.2,0.2,1.0};
    GLfloat diffuse[4]  = {1.0,1.0,1.0,1.0};
    GLfloat specular[4] = {1.0,1.0,1.0,1.0};
    
    glMaterialfv (GL_FRONT_AND_BACK, GL_SPECULAR, mat_specular);
    glMaterialfv (GL_FRONT_AND_BACK, GL_SHININESS, mat_shininess);
    
    glEnable(GL_COLOR_MATERIAL);
    glColorMaterial(GL_FRONT_AND_BACK,GL_AMBIENT_AND_DIFFUSE);
 
    switch (mode) {
        case 0:
            break;
        case 1:
            glLightModeli(GL_LIGHT_MODEL_TWO_SIDE,GL_FALSE);
            glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER,GL_FALSE);
            break;
        case 2:
            glLightModeli(GL_LIGHT_MODEL_TWO_SIDE,GL_FALSE);
            glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER,GL_TRUE);
            break;
        case 3:
            glLightModeli(GL_LIGHT_MODEL_TWO_SIDE,GL_TRUE);
            glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER,GL_FALSE);
            break;
        case 4:
            glLightModeli(GL_LIGHT_MODEL_TWO_SIDE,GL_TRUE);
            glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER,GL_TRUE);
            break;
    }
    
    glLightfv(GL_LIGHT0,GL_POSITION,position);
    glLightfv(GL_LIGHT0,GL_AMBIENT,ambient);
    glLightfv(GL_LIGHT0,GL_DIFFUSE,diffuse);
    glLightfv(GL_LIGHT0,GL_SPECULAR,specular);
    glEnable(GL_LIGHT0);
}
 
void drawGLText (GLint window_width, GLint window_height)
{
    char outString [256] = "";
    GLint matrixMode;
    GLint vp[4];
    GLint lineSpacing = 13;
    GLint line = 0;
    GLint startOffest = 7;
    
    glGetIntegerv(GL_VIEWPORT, vp);
    glViewport(0, 0, window_width, window_height);
    
    glGetIntegerv(GL_MATRIX_MODE, &matrixMode);
    glMatrixMode(GL_PROJECTION);
    glPushMatrix();
    glLoadIdentity();
    
    glMatrixMode(GL_MODELVIEW);
    glPushMatrix();
    glLoadIdentity();
    glScalef(2.0f / window_width, -2.0f / window_height, 1.0f);
    glTranslatef(-window_width / 2.0f, -window_height / 2.0f, 0.0f);
    
    // draw 
    glDisable(GL_LIGHTING);
    glColor3f (1.0, 1.0, 1.0);
    if (gShowInfo) {
    
        sprintf (outString, "Camera Position: (%0.1f, %0.1f, %0.1f)", gCamera.viewPos.x, gCamera.viewPos.y, gCamera.viewPos.z);
        drawGLString (10, window_height - (lineSpacing * line++) - startOffest, outString);
        sprintf (outString, "Trackball Rotation: (%0.1f, %0.2f, %0.2f, %0.2f)", gTrackBallRotation[0], gTrackBallRotation[1], gTrackBallRotation[2], gTrackBallRotation[3]);
        drawGLString (10, window_height - (lineSpacing * line++) - startOffest, outString);
        sprintf (outString, "World Rotation: (%0.1f, %0.2f, %0.2f, %0.2f)", gWorldRotation[0], gWorldRotation[1], gWorldRotation[2], gWorldRotation[3]);
        drawGLString (10, window_height - (lineSpacing * line++) - startOffest, outString);
        sprintf (outString, "Aperture: %0.1f", gCamera.aperture);
        drawGLString (10, window_height - (lineSpacing * line++) - startOffest, outString);
        sprintf (outString, "Focus Distance: %0.1f", gCamera.focalLength);
        drawGLString (10, window_height - (lineSpacing * line++) - startOffest, outString);
    }
    
    if (gShowHelp) {
        line = 1;
        sprintf (outString, "Controls:\n");
        drawGLString (10, (lineSpacing * line++) + startOffest, outString);
        sprintf (outString, "left button drag: rotate camera\n");
        drawGLString (10, (lineSpacing * line++) + startOffest, outString);
        sprintf (outString, "right (or crtl-left) button drag: dolly (zoom) camera\n");
        drawGLString (10, (lineSpacing * line++) + startOffest, outString);
        sprintf (outString, "arrows: aperture & focal length\n");
        drawGLString (10, (lineSpacing * line++) + startOffest, outString);
        sprintf (outString, "H: toggle help\n");
        drawGLString (10, (lineSpacing * line++) + startOffest, outString);
        sprintf (outString, "I: toggle info\n");
        drawGLString (10, (lineSpacing * line++) + startOffest, outString);
        sprintf (outString, "W: toggle wire frame\n");
        drawGLString (10, (lineSpacing * line++) + startOffest, outString);
    }
    
    glPopMatrix();
    glMatrixMode(GL_PROJECTION);
    glPopMatrix();
    glMatrixMode(matrixMode);
    
    glViewport(vp[0], vp[1], vp[2], vp[3]);
}
 
#pragma mark ---- GLUT callbacks ----
 
void init (void)
{
    glEnable(GL_DEPTH_TEST);
 
    glShadeModel(GL_SMOOTH);    
    glFrontFace(GL_CCW);
 
    glColor3f(1.0,1.0,1.0);
 
    BuildGeometry (kTranguloidTrefoil, 4, 64, 3, &gSolidList, &gWireList, &gPointList);
    
    glClearColor(0.0,0.0,0.0,0.0);         /* Background recColor */
    gCameraReset ();
    
    glPolygonOffset (1.0, 1.0);
    SetLighting(4);
    glEnable(GL_LIGHTING);
    
}
 
void reshape (int w, int h)
{
    glViewport(0,0,(GLsizei)w,(GLsizei)h);
    gCamera.screenWidth = w;
    gCamera.screenHeight = h;
    glutPostRedisplay();
}
 
void maindisplay(void)
{
    GLdouble xmin, xmax, ymin, ymax;
    // far frustum plane
    GLdouble zFar = -gCamera.viewPos.z + gShapeSize * 0.5;
    // near frustum plane clamped at 1.0
    GLdouble zNear = MIN (-gCamera.viewPos.z - gShapeSize * 0.5, 1.0);
    // window aspect ratio
    GLdouble aspect = gCamera.screenWidth / (GLdouble)gCamera.screenHeight; 
 
    glMatrixMode (GL_PROJECTION);
    glLoadIdentity ();
 
    if (aspect > 1.0) {
        ymax = zNear * tan (gCamera.aperture * 0.5 * DTOR);
        ymin = -ymax;
        xmin = ymin * aspect;
        xmax = ymax * aspect;
    } else {
        xmax = zNear * tan (gCamera.aperture * 0.5 * DTOR);
        xmin = -xmax;
        ymin = xmin / aspect;
        ymax = xmax / aspect;
    }
    glFrustum(xmin, xmax, ymin, ymax, zNear, zFar);
    
    glMatrixMode (GL_MODELVIEW);
    glLoadIdentity ();
    gluLookAt (gCamera.viewPos.x, gCamera.viewPos.y, gCamera.viewPos.z,
            gCamera.viewPos.x + gCamera.viewDir.x,
            gCamera.viewPos.y + gCamera.viewDir.y,
            gCamera.viewPos.z + gCamera.viewDir.z,
            gCamera.viewUp.x, gCamera.viewUp.y ,gCamera.viewUp.z);
            
    // track ball rotation
    glRotatef (gTrackBallRotation[0], gTrackBallRotation[1], gTrackBallRotation[2], gTrackBallRotation[3]);
    glRotatef (gWorldRotation[0], gWorldRotation[1], gWorldRotation[2], gWorldRotation[3]);
    
    glClearColor (0.2f, 0.2f, 0.4f, 1.0f);  // clear the surface
    glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    if (gLines) {
        glColor3f (1.0, 1.0, 1.0); // no coloring
        glDisable(GL_LIGHTING);
        glCallList (gWireList);
    }
    if (gPolygons) {
        glEnable(GL_LIGHTING);
        glCallList (gSolidList);
    }
    
    drawGLText (gCamera.screenWidth, gCamera.screenHeight);
 
    glutSwapBuffers();
}
 
void special(int key, int px, int py)
{
  gLastKey = key;
  switch (key) {
    case GLUT_KEY_UP: // arrow forward, close in on world
        gCamera.focalLength -= 0.5f;
        if (gCamera.focalLength < 0.0f)
            gCamera.focalLength = 0.0f;
        glutPostRedisplay();
        break;
    case GLUT_KEY_DOWN: // arrow back, back away from world
        gCamera.focalLength += 0.5f;
        glutPostRedisplay();
        break;
    case GLUT_KEY_LEFT: // arrow left, smaller aperture
        gCamera.aperture -= 0.5f;
        if (gCamera.aperture < 0.0f)
            gCamera.aperture = 0.0f;
        glutPostRedisplay();
        break;
    case GLUT_KEY_RIGHT: // arrow right, larger aperture
        gCamera.aperture += 0.5f;
        glutPostRedisplay();
        break;
  }
}
 
void mouseDolly (int x, int y)
{
    if (gDolly) {
        GLfloat dolly = (gDollyPanStartPoint[1] - y) * -gCamera.viewPos.z / 200.0f;
        GLfloat eyeRelative = gCamera.eyeSep / gCamera.focalLength;
        gCamera.focalLength += gCamera.focalLength / gCamera.viewPos.z * dolly; 
        if (gCamera.focalLength < 1.0)
            gCamera.focalLength = 1.0;
        gCamera.eyeSep = gCamera.focalLength * eyeRelative;
        gCamera.viewPos.z += dolly;
        if (gCamera.viewPos.z == 0.0) // do not let z = 0.0
            gCamera.viewPos.z = 0.0001;
        gDollyPanStartPoint[0] = x;
        gDollyPanStartPoint[1] = y;
        glutPostRedisplay();
    }
}
 
void mousePan (int x, int y)
{
    if (gPan) {
        GLfloat panX = (gDollyPanStartPoint[0] - x) / (900.0f / -gCamera.viewPos.z);
        GLfloat panY = (gDollyPanStartPoint[1] - y) / (900.0f / -gCamera.viewPos.z);
        gCamera.viewPos.x -= panX;
        gCamera.viewPos.y -= panY;
        gDollyPanStartPoint[0] = x;
        gDollyPanStartPoint[1] = y;
        glutPostRedisplay();
    }
}
 
void mouseTrackball (int x, int y)
{
    if (gTrackBall) {
        rollToTrackball (x, y, gTrackBallRotation);
        glutPostRedisplay();
    }
}
 
void mouse (int button, int state, int x, int y)
{
    if ((button == GLUT_LEFT_BUTTON) && (state == GLUT_DOWN)) {
        if (gDolly) { // if we are currently dollying, end dolly
            mouseDolly (x, y);
            gDolly = GL_FALSE;
            glutMotionFunc (NULL);
            gTrackBallRotation [0] = gTrackBallRotation [1] = gTrackBallRotation [2] = gTrackBallRotation [3] = 0.0f;
            glutMotionFunc (NULL);
        } else if (gPan) {
            mousePan (x, y);
            gPan = GL_FALSE;
            glutMotionFunc (NULL);
            gTrackBallRotation [0] = gTrackBallRotation [1] = gTrackBallRotation [2] = gTrackBallRotation [3] = 0.0f;
            glutMotionFunc (NULL);
        }
        startTrackball (x, y, 0, 0, gCamera.screenWidth, gCamera.screenHeight);
        glutMotionFunc (mouseTrackball);
        gTrackBall = GL_TRUE;
    } else if ((button == GLUT_LEFT_BUTTON) && (state == GLUT_UP)) {
        gTrackBall = GL_FALSE;
        glutMotionFunc (NULL);
        rollToTrackball (x, y, gTrackBallRotation);
        if (gTrackBallRotation[0] != 0.0)
            addToRotationTrackball (gTrackBallRotation, gWorldRotation);
        gTrackBallRotation [0] = gTrackBallRotation [1] = gTrackBallRotation [2] = gTrackBallRotation [3] = 0.0f;
    }
    else if ((button == GLUT_RIGHT_BUTTON) && (state == GLUT_DOWN)) {
        if (gTrackBall) {// if we are currently trackballing, end trackball
            gTrackBall = GL_FALSE;
            glutMotionFunc (NULL);
            rollToTrackball (x, y, gTrackBallRotation);
            if (gTrackBallRotation[0] != 0.0)
                addToRotationTrackball (gTrackBallRotation, gWorldRotation);
            gTrackBallRotation [0] = gTrackBallRotation [1] = gTrackBallRotation [2] = gTrackBallRotation [3] = 0.0f;
        } else if (gPan) {
            mousePan (x, y);
            gPan = GL_FALSE;
            glutMotionFunc (NULL);
            gTrackBallRotation [0] = gTrackBallRotation [1] = gTrackBallRotation [2] = gTrackBallRotation [3] = 0.0f;
            glutMotionFunc (NULL);
        }
        gDollyPanStartPoint[0] = x;
        gDollyPanStartPoint[1] = y;
        glutMotionFunc (mouseDolly);
        gDolly = GL_TRUE;
    } else if ((button == GLUT_RIGHT_BUTTON) && (state == GLUT_UP)) {
        mouseDolly (x, y);
        gDolly = GL_FALSE;
        glutMotionFunc (NULL);
        gTrackBallRotation [0] = gTrackBallRotation [1] = gTrackBallRotation [2] = gTrackBallRotation [3] = 0.0f;
        glutMotionFunc (NULL);
    }
    else if ((button == GLUT_MIDDLE_BUTTON) && (state == GLUT_DOWN)) {
        if (gTrackBall) {// if we are currently trackballing, end trackball
            gTrackBall = GL_FALSE;
            glutMotionFunc (NULL);
            rollToTrackball (x, y, gTrackBallRotation);
            if (gTrackBallRotation[0] != 0.0)
                addToRotationTrackball (gTrackBallRotation, gWorldRotation);
            gTrackBallRotation [0] = gTrackBallRotation [1] = gTrackBallRotation [2] = gTrackBallRotation [3] = 0.0f;
        } else if (gDolly) {
            mouseDolly (x, y);
            gDolly = GL_FALSE;
            glutMotionFunc (NULL);
            gTrackBallRotation [0] = gTrackBallRotation [1] = gTrackBallRotation [2] = gTrackBallRotation [3] = 0.0f;
            glutMotionFunc (NULL);
        }
        gDollyPanStartPoint[0] = x;
        gDollyPanStartPoint[1] = y;
        glutMotionFunc (mousePan);
        gPan = GL_TRUE;
    } else if ((button == GLUT_MIDDLE_BUTTON) && (state == GLUT_UP)) {
        mousePan (x, y);
        gPan = GL_FALSE;
        glutMotionFunc (NULL);
        gTrackBallRotation [0] = gTrackBallRotation [1] = gTrackBallRotation [2] = gTrackBallRotation [3] = 0.0f;
        glutMotionFunc (NULL);
    }
}
 
void key(unsigned char inkey, int px, int py)
{
  gLastKey = inkey;
  switch (inkey) {
    case 27:
        exit(0);
        break;
    case 'h': // help
    case 'H':
        gShowHelp =  1 - gShowHelp;
        glutPostRedisplay();
        break;
    case 'i': // info
    case 'I':
        gShowInfo =  1 - gShowInfo;
        glutPostRedisplay();
        break;
    case 'w': // toggle wire
    case 'W':
        gLines = 1 - gLines;
        gPolygons = 1 - gPolygons;
        glutPostRedisplay();
        break;
  }
}
 
void spaceballmotion (int x, int y, int z)
{
    long deadZone = 105;
    float scale = -gCamera.viewPos.z * 0.00000001f;
    if (abs (x) > deadZone) {
        GLfloat panX = abs (x) * x * scale;
        gCamera.viewPos.x += panX;
    }
    if (abs (y) > deadZone) {
        GLfloat panY = abs (y) * y * scale;
        gCamera.viewPos.y -= panY;
    }
    if (abs (z) > deadZone) {
        GLfloat dolly = abs (z) * z * scale;
        gCamera.viewPos.z += dolly;
        if (gCamera.viewPos.z == 0.0) // do not let z = 0.0
            gCamera.viewPos.z = 0.0001;
    }
    glutPostRedisplay();
}
 
void spaceballrotate (int rx, int ry, int rz)
{
    long deadZone = 60;
    float rotation[4] = {0.0f, 0.0f, 0.0f, 0.0f};
    // handle rotations about each respective axis
    if (abs (rx) > deadZone) {
        rotation[0] = abs (rx) * -rx * 0.0000008f;
        rotation[1] = 1.0f;
        rotation[2] = 0.0f;
        rotation[3] = 0.0f;
        addToRotationTrackball (rotation, gWorldRotation);
    }
    if (abs (ry) > deadZone) {
        rotation[0] = abs (ry) * ry * 0.0000008f;
        rotation[1] = 0.0f;
        rotation[2] = 1.0f;
        rotation[3] = 0.0f;
        addToRotationTrackball (rotation, gWorldRotation);
    }
    if (abs(rz) > deadZone) {
        rotation[0] = abs (rz) * -rz * 0.0000008f;
        rotation[1] = 0.0f;
        rotation[2] = 0.0f;
        rotation[3] = 1.0f;
        addToRotationTrackball (rotation, gWorldRotation);
    }
    glutPostRedisplay();
}
 
#pragma mark ---- main ----
 
int main (int argc, const char * argv[])
{
    glutInit(&argc, (char **)argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH); // non-stereo for main window
    glutInitWindowPosition (300, 50);
    glutInitWindowSize (800, 600);
    gMainWindow = glutCreateWindow("GLUT Basics");
 
    init(); // standard GL init
 
    glutReshapeFunc (reshape);
    glutDisplayFunc (maindisplay);
    glutKeyboardFunc (key);
    glutSpecialFunc (special);
    glutMouseFunc (mouse);
    glutSpaceballMotionFunc(spaceballmotion);
    glutSpaceballRotateFunc(spaceballrotate);
    glutMainLoop();
    return 0;
}


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