140 lines
2.6 KiB
C
140 lines
2.6 KiB
C
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/*
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* Test GL_EXT_rescale_normal extension
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* Brian Paul January 1998 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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static GLfloat Phi = 0.0;
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static void Idle( void )
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{
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static double t0 = -1.;
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double dt, t = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
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if (t0 < 0.0)
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t0 = t;
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dt = t - t0;
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t0 = t;
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Phi += 3.0 * dt;
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glutPostRedisplay();
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}
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static void Display( void )
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{
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GLfloat scale = 0.6 + 0.5 * sin(Phi);
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glClear( GL_COLOR_BUFFER_BIT );
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glPushMatrix();
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glScalef(scale, scale, scale);
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glutSolidSphere(2.0, 20, 20);
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glPopMatrix();
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glutSwapBuffers();
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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, 5.0, 25.0 );
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glMatrixMode( GL_MODELVIEW );
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glLoadIdentity();
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glTranslatef( 0.0, 0.0, -15.0 );
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}
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static void Init( void )
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{
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static GLfloat mat[4] = { 0.8, 0.8, 0.0, 1.0 };
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static GLfloat pos[4] = { -1.0, 1.0, 1.0, 0.0 };
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/* setup lighting, etc */
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glEnable(GL_LIGHTING);
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glEnable(GL_LIGHT0);
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glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, mat);
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glLightfv(GL_LIGHT0, GL_POSITION, pos);
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glEnable(GL_CULL_FACE);
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glDisable(GL_RESCALE_NORMAL_EXT);
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glDisable(GL_NORMALIZE);
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}
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#define UNSCALED 1
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#define NORMALIZE 2
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#define RESCALE 3
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#define QUIT 4
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static void ModeMenu(int entry)
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{
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if (entry==UNSCALED) {
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glDisable(GL_RESCALE_NORMAL_EXT);
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glDisable(GL_NORMALIZE);
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}
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else if (entry==NORMALIZE) {
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glEnable(GL_NORMALIZE);
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glDisable(GL_RESCALE_NORMAL_EXT);
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}
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else if (entry==RESCALE) {
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glDisable(GL_NORMALIZE);
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glEnable(GL_RESCALE_NORMAL_EXT);
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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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glutPostRedisplay();
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}
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static void
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key(unsigned char k, 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 (k) {
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case 27: /* Escape */
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exit(0);
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break;
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default:
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return;
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}
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glutPostRedisplay();
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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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glutInitWindowPosition(0, 0);
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glutInitWindowSize( 400, 400 );
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glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
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glutCreateWindow(argv[0]);
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Init();
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glutIdleFunc( Idle );
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glutReshapeFunc( Reshape );
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glutDisplayFunc( Display );
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glutKeyboardFunc(key);
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glutCreateMenu(ModeMenu);
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glutAddMenuEntry("Unscaled", UNSCALED);
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glutAddMenuEntry("Normalize", NORMALIZE);
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glutAddMenuEntry("Rescale EXT", RESCALE);
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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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