jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 1 | |
| 2 | /* |
| 3 | * Test GL_EXT_rescale_normal extension |
| 4 | * Brian Paul January 1998 This program is in the public domain. |
| 5 | */ |
| 6 | |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 7 | #include <stdio.h> |
| 8 | #include <stdlib.h> |
| 9 | #include <math.h> |
| 10 | #include <GL/glut.h> |
| 11 | |
| 12 | |
| 13 | static GLfloat Phi = 0.0; |
| 14 | |
| 15 | |
Brian Paul | 92eddb0 | 2005-01-09 17:37:50 +0000 | [diff] [blame] | 16 | static void Idle( void ) |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 17 | { |
Brian Paul | 92eddb0 | 2005-01-09 17:37:50 +0000 | [diff] [blame] | 18 | static double t0 = -1.; |
| 19 | double dt, t = glutGet(GLUT_ELAPSED_TIME) / 1000.0; |
| 20 | if (t0 < 0.0) |
| 21 | t0 = t; |
| 22 | dt = t - t0; |
| 23 | t0 = t; |
| 24 | Phi += 3.0 * dt; |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 25 | glutPostRedisplay(); |
| 26 | } |
| 27 | |
| 28 | |
| 29 | static void Display( void ) |
| 30 | { |
| 31 | GLfloat scale = 0.6 + 0.5 * sin(Phi); |
| 32 | glClear( GL_COLOR_BUFFER_BIT ); |
| 33 | glPushMatrix(); |
| 34 | glScalef(scale, scale, scale); |
| 35 | glutSolidSphere(2.0, 20, 20); |
| 36 | glPopMatrix(); |
| 37 | glutSwapBuffers(); |
| 38 | } |
| 39 | |
| 40 | |
| 41 | static void Reshape( int width, int height ) |
| 42 | { |
| 43 | glViewport( 0, 0, width, height ); |
| 44 | glMatrixMode( GL_PROJECTION ); |
| 45 | glLoadIdentity(); |
| 46 | glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 25.0 ); |
| 47 | glMatrixMode( GL_MODELVIEW ); |
| 48 | glLoadIdentity(); |
| 49 | glTranslatef( 0.0, 0.0, -15.0 ); |
| 50 | } |
| 51 | |
| 52 | |
| 53 | |
| 54 | static void Init( void ) |
| 55 | { |
| 56 | static GLfloat mat[4] = { 0.8, 0.8, 0.0, 1.0 }; |
| 57 | static GLfloat pos[4] = { -1.0, 1.0, 1.0, 0.0 }; |
| 58 | |
| 59 | /* setup lighting, etc */ |
| 60 | glEnable(GL_LIGHTING); |
| 61 | glEnable(GL_LIGHT0); |
| 62 | glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, mat); |
| 63 | glLightfv(GL_LIGHT0, GL_POSITION, pos); |
| 64 | |
| 65 | glEnable(GL_CULL_FACE); |
| 66 | |
| 67 | glDisable(GL_RESCALE_NORMAL_EXT); |
| 68 | glDisable(GL_NORMALIZE); |
| 69 | } |
| 70 | |
| 71 | |
| 72 | #define UNSCALED 1 |
| 73 | #define NORMALIZE 2 |
| 74 | #define RESCALE 3 |
| 75 | #define QUIT 4 |
| 76 | |
| 77 | |
| 78 | static void ModeMenu(int entry) |
| 79 | { |
| 80 | if (entry==UNSCALED) { |
| 81 | glDisable(GL_RESCALE_NORMAL_EXT); |
| 82 | glDisable(GL_NORMALIZE); |
| 83 | } |
| 84 | else if (entry==NORMALIZE) { |
| 85 | glEnable(GL_NORMALIZE); |
| 86 | glDisable(GL_RESCALE_NORMAL_EXT); |
| 87 | } |
| 88 | else if (entry==RESCALE) { |
| 89 | glDisable(GL_NORMALIZE); |
| 90 | glEnable(GL_RESCALE_NORMAL_EXT); |
| 91 | } |
| 92 | else if (entry==QUIT) { |
| 93 | exit(0); |
| 94 | } |
| 95 | glutPostRedisplay(); |
| 96 | } |
| 97 | |
Ted Jump | 83c02ef | 1999-09-17 02:40:51 +0000 | [diff] [blame] | 98 | static void |
| 99 | key(unsigned char k, int x, int y) |
| 100 | { |
Brian Paul | ecaf1a0 | 1999-09-17 12:27:01 +0000 | [diff] [blame] | 101 | (void) x; |
| 102 | (void) y; |
Ted Jump | 83c02ef | 1999-09-17 02:40:51 +0000 | [diff] [blame] | 103 | switch (k) { |
| 104 | case 27: /* Escape */ |
| 105 | exit(0); |
| 106 | break; |
| 107 | default: |
| 108 | return; |
| 109 | } |
| 110 | glutPostRedisplay(); |
| 111 | } |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 112 | |
| 113 | int main( int argc, char *argv[] ) |
| 114 | { |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 115 | glutInitWindowSize( 400, 400 ); |
Brian Paul | 263f432 | 2009-12-18 08:12:55 -0700 | [diff] [blame] | 116 | glutInit( &argc, argv ); |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 117 | glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE ); |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 118 | glutCreateWindow(argv[0]); |
| 119 | |
| 120 | Init(); |
| 121 | |
| 122 | glutIdleFunc( Idle ); |
| 123 | glutReshapeFunc( Reshape ); |
| 124 | glutDisplayFunc( Display ); |
Ted Jump | 83c02ef | 1999-09-17 02:40:51 +0000 | [diff] [blame] | 125 | glutKeyboardFunc(key); |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 126 | |
| 127 | glutCreateMenu(ModeMenu); |
| 128 | glutAddMenuEntry("Unscaled", UNSCALED); |
| 129 | glutAddMenuEntry("Normalize", NORMALIZE); |
| 130 | glutAddMenuEntry("Rescale EXT", RESCALE); |
| 131 | glutAddMenuEntry("Quit", QUIT); |
| 132 | glutAttachMenu(GLUT_RIGHT_BUTTON); |
| 133 | |
| 134 | glutMainLoop(); |
| 135 | return 0; |
| 136 | } |