src/tests/backspecular.c

   1 #include <stdlib.h>
   2 #include <GL/glew.h>
   3 #include "glut_wrap.h"
   4
   5
   6 static const float black[4]    = { 0, 0, 0, 1 };
   7 static const float white[4]    = { 1, 1, 1, 1 };
   8 static const float diffuse[4]  = { 1, 0, 0, 1 };
   9 static const float diffuseb[4] = { 0, 1, 0, 1 };
  10 static const float specular[4] = { 0.5, 0.5, 0.5, 1 };
  11 static const float ambient[4]  = { 0.2, 0.2, 0.2, 1 };
  12 static const float lightpos[4] = { 0, 0, 10, 0 };
  13 static const float shininess = 50;
  14
  15 static double angle = 0.0;
  16
  17 static int autorotate = 1;
  18 static double angle_delta = 1.0;
  19 static int timeout = 10;
  20
  21
  22 static void
  23 display(void)
  24 {
  25    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  26    glPushMatrix();
  27    glRotated(angle, 0.0, 1.0, 0.0);
  28
  29    glBegin(GL_QUADS);
  30    glColor3f(1, 1, 1);
  31    glNormal3d(0, 0, 1);
  32    glVertex3d(-1, -1, 0);
  33    glVertex3d(+1, -1, 0);
  34    glVertex3d(+1, +1, 0);
  35    glVertex3d(-1, +1, 0);
  36    glEnd();
  37
  38    glPopMatrix();
  39
  40    glutSwapBuffers();
  41 }
  42
  43
  44 static void
  45 timer(int value)
  46 {
  47    angle += angle_delta;
  48    glutTimerFunc(timeout, timer, 0);
  49    glutPostRedisplay();
  50 }
  51
  52
  53 static void
  54 key(unsigned char key, int x, int y)
  55 {
  56    if (key == 27) {
  57       exit(0);
  58    }
  59 }
  60
  61
  62 int
  63 main(int argc, char **argv)
  64 {
  65    /* init glut */
  66    glutInit(&argc, argv);
  67    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH);
  68    glutCreateWindow("Backface specular test");
  69    glutDisplayFunc(display);
  70    glutKeyboardFunc(key);
  71    if (autorotate)
  72       glutTimerFunc(timeout, timer, 0);
  73
  74    /* setup lighting */
  75    glMaterialfv(GL_FRONT, GL_DIFFUSE, diffuse);
  76    glMaterialfv(GL_BACK,  GL_DIFFUSE, diffuseb);
  77
  78    glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION,  black);
  79    glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR,  specular);
  80    glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT,   ambient);
  81    glMaterialf (GL_FRONT_AND_BACK, GL_SHININESS, shininess);
  82
  83    glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER, GL_FALSE);
  84    glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL, GL_SEPARATE_SPECULAR_COLOR);
  85    glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE);
  86
  87    glLightfv(GL_LIGHT0, GL_AMBIENT,  black);
  88    glLightfv(GL_LIGHT0, GL_DIFFUSE,  white);
  89    glLightfv(GL_LIGHT0, GL_POSITION, lightpos);
  90    glLightfv(GL_LIGHT0, GL_SPECULAR, white);
  91
  92    glDisable(GL_CULL_FACE);
  93    glEnable(GL_LIGHTING);
  94    glEnable(GL_LIGHT0);
  95
  96    /* setup camera */
  97    glMatrixMode(GL_PROJECTION);
  98    gluPerspective(30.0, 1.0, 1.0, 10.0);
  99    glMatrixMode(GL_MODELVIEW);
 100    gluLookAt(0.0, 0.0, 5.0,
 101              0.0, 0.0, 0.0,
 102              0.0, 1.0, 0.0);
 103
 104    /* setup misc */
 105    glEnable(GL_DEPTH_TEST);
 106    glClearColor(0, 0, 1, 1);
 107
 108    /* run */
 109    glutMainLoop();
 110
 111    return 0;
 112 }