blob: c04d5004e37572f6ee2355ef0b220db2f442765e [file] [log] [blame]
/*
* Textured cylinder demo: lighting, texturing, reflection mapping.
*
* Command line options:
* -info print GL implementation information
*
*
* Brian Paul May 1997 This program is in the public domain.
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include <GL/glut.h>
#include "readtex.h"
#define TEXTURE_FILE "../images/reflect.rgb"
#define LIT 1
#define TEXTURED 2
#define REFLECT 3
#define ANIMATE 10
#define POINT_FILTER 20
#define LINEAR_FILTER 21
#define QUIT 100
static GLuint CylinderObj = 0;
static GLboolean Animate = GL_TRUE;
static GLfloat Xrot = 0.0, Yrot = 0.0, Zrot = 0.0;
static GLfloat DXrot = 50.0, DYrot = 125.0;
/* performance info */
static GLint T0 = 0;
static GLint Frames = 0;
static void Idle( void )
{
static double t0 = -1.;
double dt, t = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
if (t0 < 0.0)
t0 = t;
dt = t - t0;
t0 = t;
if (Animate) {
Xrot += DXrot * dt;
Yrot += DYrot * dt;
glutPostRedisplay();
}
}
static void Display( void )
{
glClear( GL_COLOR_BUFFER_BIT );
glPushMatrix();
glRotatef(Xrot, 1.0, 0.0, 0.0);
glRotatef(Yrot, 0.0, 1.0, 0.0);
glRotatef(Zrot, 0.0, 0.0, 1.0);
glScalef(5.0, 5.0, 5.0);
glCallList(CylinderObj);
glPopMatrix();
glutSwapBuffers();
if (Animate) {
GLint t = glutGet(GLUT_ELAPSED_TIME);
Frames++;
if (t - T0 >= 5000) {
GLfloat seconds = (t - T0) / 1000.0;
GLfloat fps = Frames / seconds;
printf("%d frames in %g seconds = %g FPS\n", Frames, seconds, fps);
T0 = t;
Frames = 0;
}
}
}
static void Reshape( int width, int height )
{
glViewport( 0, 0, width, height );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glFrustum( -1.0, 1.0, -1.0, 1.0, 10.0, 100.0 );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
glTranslatef( 0.0, 0.0, -70.0 );
}
static void SetMode(GLuint m)
{
/* disable everything */
glDisable(GL_LIGHTING);
glDisable(GL_TEXTURE_2D);
glDisable(GL_TEXTURE_GEN_S);
glDisable(GL_TEXTURE_GEN_T);
/* enable what's needed */
if (m==LIT) {
glEnable(GL_LIGHTING);
}
else if (m==TEXTURED) {
glEnable(GL_TEXTURE_2D);
}
else if (m==REFLECT) {
glEnable(GL_TEXTURE_2D);
glEnable(GL_TEXTURE_GEN_S);
glEnable(GL_TEXTURE_GEN_T);
}
}
static void ModeMenu(int entry)
{
if (entry==ANIMATE) {
Animate = !Animate;
if (Animate)
glutIdleFunc(Idle);
else
glutIdleFunc(NULL);
}
else if (entry==POINT_FILTER) {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
}
else if (entry==LINEAR_FILTER) {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
}
else if (entry==QUIT) {
exit(0);
}
else {
SetMode(entry);
}
glutPostRedisplay();
}
static void Key( unsigned char key, int x, int y )
{
(void) x;
(void) y;
switch (key) {
case ' ':
Animate = !Animate;
if (Animate)
glutIdleFunc(Idle);
else
glutIdleFunc(NULL);
break;
case 27:
exit(0);
break;
}
glutPostRedisplay();
}
static void SpecialKey( int key, int x, int y )
{
float step = 3.0;
(void) x;
(void) y;
switch (key) {
case GLUT_KEY_UP:
Xrot += step;
break;
case GLUT_KEY_DOWN:
Xrot -= step;
break;
case GLUT_KEY_LEFT:
Yrot += step;
break;
case GLUT_KEY_RIGHT:
Yrot -= step;
break;
}
glutPostRedisplay();
}
static void Init( int argc, char *argv[] )
{
GLUquadricObj *q = gluNewQuadric();
CylinderObj = glGenLists(1);
glNewList(CylinderObj, GL_COMPILE);
glTranslatef(0.0, 0.0, -1.0);
/* cylinder */
gluQuadricNormals(q, GL_SMOOTH);
gluQuadricTexture(q, GL_TRUE);
gluCylinder(q, 0.6, 0.6, 2.0, 24, 1);
/* end cap */
glTranslatef(0.0, 0.0, 2.0);
gluDisk(q, 0.0, 0.6, 24, 1);
/* other end cap */
glTranslatef(0.0, 0.0, -2.0);
gluQuadricOrientation(q, GLU_INSIDE);
gluDisk(q, 0.0, 0.6, 24, 1);
glEndList();
gluDeleteQuadric(q);
/* lighting */
glEnable(GL_LIGHTING);
{
GLfloat gray[4] = {0.2, 0.2, 0.2, 1.0};
GLfloat white[4] = {1.0, 1.0, 1.0, 1.0};
GLfloat teal[4] = { 0.0, 1.0, 0.8, 1.0 };
glMaterialfv(GL_FRONT, GL_DIFFUSE, teal);
glLightfv(GL_LIGHT0, GL_AMBIENT, gray);
glLightfv(GL_LIGHT0, GL_DIFFUSE, white);
glEnable(GL_LIGHT0);
}
/* fitering = nearest, initially */
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_FASTEST);
glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
if (!LoadRGBMipmaps(TEXTURE_FILE, GL_RGB)) {
printf("Error: couldn't load texture image\n");
exit(1);
}
glEnable(GL_CULL_FACE); /* don't need Z testing for convex objects */
SetMode(LIT);
if (argc > 1 && strcmp(argv[1], "-info")==0) {
printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
printf("GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
}
}
int main( int argc, char *argv[] )
{
glutInit( &argc, argv );
glutInitWindowSize( 400, 400 );
glutInitWindowPosition( 0, 0 );
glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
glutCreateWindow(argv[0] );
Init(argc, argv);
glutReshapeFunc( Reshape );
glutKeyboardFunc( Key );
glutSpecialFunc( SpecialKey );
glutDisplayFunc( Display );
glutIdleFunc( Idle );
glutCreateMenu(ModeMenu);
glutAddMenuEntry("Lit", LIT);
glutAddMenuEntry("Textured", TEXTURED);
glutAddMenuEntry("Reflect", REFLECT);
glutAddMenuEntry("Point Filtered", POINT_FILTER);
glutAddMenuEntry("Linear Filtered", LINEAR_FILTER);
glutAddMenuEntry("Toggle Animation", ANIMATE);
glutAddMenuEntry("Quit", QUIT);
glutAttachMenu(GLUT_RIGHT_BUTTON);
glutMainLoop();
return 0;
}