Initial revision

progs/demos/renormal.c

@@ -0,0 +1,123 @@
+/* $Id: renormal.c,v 1.1 1999/08/19 00:55:40 jtg Exp $ */
+
+/*
+ * Test GL_EXT_rescale_normal extension
+ * Brian Paul  January 1998   This program is in the public domain.
+ */
+
+/*
+ * $Id: renormal.c,v 1.1 1999/08/19 00:55:40 jtg Exp $
+ */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <GL/glut.h>
+
+
+static GLfloat Phi = 0.0;
+
+
+static void Idle(void)
+{
+   Phi += 0.1;
+   glutPostRedisplay();
+}
+
+
+static void Display( void )
+{
+   GLfloat scale = 0.6 + 0.5 * sin(Phi);
+   glClear( GL_COLOR_BUFFER_BIT );
+   glPushMatrix();
+   glScalef(scale, scale, scale);
+   glutSolidSphere(2.0, 20, 20);
+   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, 5.0, 25.0 );
+   glMatrixMode( GL_MODELVIEW );
+   glLoadIdentity();
+   glTranslatef( 0.0, 0.0, -15.0 );
+}
+
+
+
+static void Init( void )
+{
+   static GLfloat mat[4] = { 0.8, 0.8, 0.0, 1.0 };
+   static GLfloat pos[4] = { -1.0, 1.0, 1.0, 0.0 };
+
+   /* setup lighting, etc */
+   glEnable(GL_LIGHTING);
+   glEnable(GL_LIGHT0);
+   glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, mat);
+   glLightfv(GL_LIGHT0, GL_POSITION, pos);
+
+   glEnable(GL_CULL_FACE);
+
+   glDisable(GL_RESCALE_NORMAL_EXT);
+   glDisable(GL_NORMALIZE);
+}
+
+
+#define UNSCALED  1
+#define NORMALIZE 2
+#define RESCALE   3
+#define QUIT      4
+
+
+static void ModeMenu(int entry)
+{
+   if (entry==UNSCALED) {
+      glDisable(GL_RESCALE_NORMAL_EXT);
+      glDisable(GL_NORMALIZE);
+   }
+   else if (entry==NORMALIZE) {
+      glEnable(GL_NORMALIZE);
+      glDisable(GL_RESCALE_NORMAL_EXT);
+   }
+   else if (entry==RESCALE) {
+      glDisable(GL_NORMALIZE);
+      glEnable(GL_RESCALE_NORMAL_EXT);
+   }
+   else if (entry==QUIT) {
+      exit(0);
+   }
+   glutPostRedisplay();
+}
+
+
+int main( int argc, char *argv[] )
+{
+   glutInit( &argc, argv );
+   glutInitWindowSize( 400, 400 );
+
+   glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
+
+   glutCreateWindow(argv[0]);
+
+   Init();
+
+   glutIdleFunc( Idle );
+   glutReshapeFunc( Reshape );
+   glutDisplayFunc( Display );
+
+   glutCreateMenu(ModeMenu);
+   glutAddMenuEntry("Unscaled", UNSCALED);
+   glutAddMenuEntry("Normalize", NORMALIZE);
+   glutAddMenuEntry("Rescale EXT", RESCALE);
+   glutAddMenuEntry("Quit", QUIT);
+   glutAttachMenu(GLUT_RIGHT_BUTTON);
+
+   glutMainLoop();
+   return 0;
+}