Initial revision
diff --git a/progs/demos/texcyl.c b/progs/demos/texcyl.c
new file mode 100644
index 0000000..0358d29
--- /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;
+}