281 lines
6.2 KiB
C
281 lines
6.2 KiB
C
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/*
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* Textured cylinder demo: lighting, texturing, reflection mapping.
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*
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* Command line options:
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* -info print GL implementation information
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*
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*
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* Brian Paul May 1997 This program is in the public domain.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <GL/glut.h>
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#include "readtex.c" /* I know, this is a hack. */
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#define TEXTURE_FILE "../images/reflect.rgb"
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#define LIT 1
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#define TEXTURED 2
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#define REFLECT 3
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#define ANIMATE 10
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#define POINT_FILTER 20
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#define LINEAR_FILTER 21
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#define QUIT 100
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static GLuint CylinderObj = 0;
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static GLboolean Animate = GL_TRUE;
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static GLfloat Xrot = 0.0, Yrot = 0.0, Zrot = 0.0;
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static GLfloat DXrot = 1.0, DYrot = 2.5;
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/* performance info */
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static GLint T0 = 0;
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static GLint Frames = 0;
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static void Idle( void )
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{
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if (Animate) {
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Xrot += DXrot;
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Yrot += DYrot;
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glutPostRedisplay();
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}
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}
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static void Display( void )
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{
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glClear( GL_COLOR_BUFFER_BIT );
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glPushMatrix();
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glRotatef(Xrot, 1.0, 0.0, 0.0);
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glRotatef(Yrot, 0.0, 1.0, 0.0);
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glRotatef(Zrot, 0.0, 0.0, 1.0);
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glScalef(5.0, 5.0, 5.0);
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glCallList(CylinderObj);
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glPopMatrix();
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glutSwapBuffers();
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if (Animate) {
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GLint t = glutGet(GLUT_ELAPSED_TIME);
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Frames++;
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if (t - T0 >= 5000) {
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GLfloat seconds = (t - T0) / 1000.0;
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GLfloat fps = Frames / seconds;
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printf("%d frames in %g seconds = %g FPS\n", Frames, seconds, fps);
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T0 = t;
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Frames = 0;
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}
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}
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}
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static void Reshape( int width, int height )
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{
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glViewport( 0, 0, width, height );
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glMatrixMode( GL_PROJECTION );
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glLoadIdentity();
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glFrustum( -1.0, 1.0, -1.0, 1.0, 10.0, 100.0 );
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glMatrixMode( GL_MODELVIEW );
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glLoadIdentity();
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glTranslatef( 0.0, 0.0, -70.0 );
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}
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static void SetMode(GLuint m)
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{
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/* disable everything */
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glDisable(GL_LIGHTING);
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glDisable(GL_TEXTURE_2D);
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glDisable(GL_TEXTURE_GEN_S);
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glDisable(GL_TEXTURE_GEN_T);
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/* enable what's needed */
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if (m==LIT) {
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glEnable(GL_LIGHTING);
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}
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else if (m==TEXTURED) {
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glEnable(GL_TEXTURE_2D);
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}
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else if (m==REFLECT) {
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glEnable(GL_TEXTURE_2D);
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glEnable(GL_TEXTURE_GEN_S);
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glEnable(GL_TEXTURE_GEN_T);
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}
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}
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static void ModeMenu(int entry)
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{
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if (entry==ANIMATE) {
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Animate = !Animate;
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if (Animate)
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glutIdleFunc(Idle);
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else
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glutIdleFunc(NULL);
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}
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else if (entry==POINT_FILTER) {
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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}
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else if (entry==LINEAR_FILTER) {
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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}
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else if (entry==QUIT) {
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exit(0);
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}
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else {
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SetMode(entry);
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}
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glutPostRedisplay();
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}
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static void Key( unsigned char key, int x, int y )
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{
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(void) x;
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(void) y;
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switch (key) {
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case ' ':
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Animate = !Animate;
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if (Animate)
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glutIdleFunc(Idle);
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else
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glutIdleFunc(NULL);
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break;
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case 27:
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exit(0);
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break;
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}
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glutPostRedisplay();
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}
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static void SpecialKey( int key, int x, int y )
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{
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float step = 3.0;
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(void) x;
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(void) y;
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switch (key) {
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case GLUT_KEY_UP:
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Xrot += step;
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break;
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case GLUT_KEY_DOWN:
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Xrot -= step;
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break;
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case GLUT_KEY_LEFT:
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Yrot += step;
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break;
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case GLUT_KEY_RIGHT:
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Yrot -= step;
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break;
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}
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glutPostRedisplay();
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}
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static void Init( int argc, char *argv[] )
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{
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GLUquadricObj *q = gluNewQuadric();
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CylinderObj = glGenLists(1);
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glNewList(CylinderObj, GL_COMPILE);
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glTranslatef(0.0, 0.0, -1.0);
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/* cylinder */
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gluQuadricNormals(q, GL_SMOOTH);
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gluQuadricTexture(q, GL_TRUE);
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gluCylinder(q, 0.6, 0.6, 2.0, 24, 1);
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/* end cap */
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glTranslatef(0.0, 0.0, 2.0);
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gluDisk(q, 0.0, 0.6, 24, 1);
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/* other end cap */
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glTranslatef(0.0, 0.0, -2.0);
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gluQuadricOrientation(q, GLU_INSIDE);
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gluDisk(q, 0.0, 0.6, 24, 1);
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glEndList();
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gluDeleteQuadric(q);
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/* lighting */
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glEnable(GL_LIGHTING);
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{
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GLfloat gray[4] = {0.2, 0.2, 0.2, 1.0};
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GLfloat white[4] = {1.0, 1.0, 1.0, 1.0};
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GLfloat teal[4] = { 0.0, 1.0, 0.8, 1.0 };
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glMaterialfv(GL_FRONT, GL_DIFFUSE, teal);
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glLightfv(GL_LIGHT0, GL_AMBIENT, gray);
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glLightfv(GL_LIGHT0, GL_DIFFUSE, white);
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glEnable(GL_LIGHT0);
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}
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/* fitering = nearest, initially */
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
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glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_FASTEST);
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glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
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glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
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if (!LoadRGBMipmaps(TEXTURE_FILE, GL_RGB)) {
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printf("Error: couldn't load texture image\n");
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exit(1);
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}
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glEnable(GL_CULL_FACE); /* don't need Z testing for convex objects */
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SetMode(LIT);
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if (argc > 1 && strcmp(argv[1], "-info")==0) {
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printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
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printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
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printf("GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
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printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
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}
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}
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int main( int argc, char *argv[] )
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{
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glutInit( &argc, argv );
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glutInitWindowSize( 400, 400 );
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glutInitWindowPosition( 0, 0 );
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glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
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glutCreateWindow(argv[0] );
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Init(argc, argv);
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glutReshapeFunc( Reshape );
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glutKeyboardFunc( Key );
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glutSpecialFunc( SpecialKey );
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glutDisplayFunc( Display );
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glutIdleFunc( Idle );
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glutCreateMenu(ModeMenu);
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glutAddMenuEntry("Lit", LIT);
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glutAddMenuEntry("Textured", TEXTURED);
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glutAddMenuEntry("Reflect", REFLECT);
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glutAddMenuEntry("Point Filtered", POINT_FILTER);
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glutAddMenuEntry("Linear Filtered", LINEAR_FILTER);
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glutAddMenuEntry("Toggle Animation", ANIMATE);
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glutAddMenuEntry("Quit", QUIT);
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glutAttachMenu(GLUT_RIGHT_BUTTON);
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glutMainLoop();
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return 0;
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}
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