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Diffstat (limited to 'progs/demos/texcyl.c')
| -rw-r--r-- | progs/demos/texcyl.c | 261 |
1 files changed, 261 insertions, 0 deletions
diff --git a/progs/demos/texcyl.c b/progs/demos/texcyl.c new file mode 100644 index 0000000000..0358d2975c --- /dev/null +++ b/progs/demos/texcyl.c @@ -0,0 +1,261 @@ +/* $Id: texcyl.c,v 1.1 1999/08/19 00:55:40 jtg Exp $ */ + +/* + * Textured cylinder demo: lighting, texturing, reflection mapping. + * Brian Paul May 1997 This program is in the public domain. + */ + +/* + * $Log: texcyl.c,v $ + * Revision 1.1 1999/08/19 00:55:40 jtg + * Initial revision + * + * Revision 3.3 1999/03/28 18:24:37 brianp + * minor clean-up + * + * Revision 3.2 1998/11/05 04:34:04 brianp + * moved image files to ../images/ directory + * + * Revision 3.1 1998/06/23 03:16:51 brianp + * added Point/Linear sampling menu items + * + * Revision 3.0 1998/02/14 18:42:29 brianp + * initial rev + * + */ + + +#include <stdio.h> +#include <stdlib.h> +#include <math.h> +#include <GL/glut.h> + +#include "../util/readtex.c" /* I know, this is a hack. */ + +#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 = 1.0, DYrot = 2.5; + + +static void Idle( void ) +{ + if (Animate) { + Xrot += DXrot; + Yrot += DYrot; + 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(); +} + + +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; + } + 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 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( void ) +{ + 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); +} + + +int main( int argc, char *argv[] ) +{ + glutInit( &argc, argv ); + glutInitWindowSize( 400, 400 ); + + glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE ); + + glutCreateWindow(argv[0] ); + + Init(); + + 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; +} |