Initial revision

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;
+}