diff options
Diffstat (limited to 'progs/demos/renormal.c')
-rw-r--r-- | progs/demos/renormal.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/progs/demos/renormal.c b/progs/demos/renormal.c new file mode 100644 index 00000000000..9e5da95484c --- /dev/null +++ b/progs/demos/renormal.c @@ -0,0 +1,139 @@ + +/* + * Test GL_EXT_rescale_normal extension + * Brian Paul January 1998 This program is in the public domain. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <math.h> +#include <GL/glut.h> + + +static GLfloat Phi = 0.0; + + +static void Idle( void ) +{ + static double t0 = -1.; + double dt, t = glutGet(GLUT_ELAPSED_TIME) / 1000.0; + if (t0 < 0.0) + t0 = t; + dt = t - t0; + t0 = t; + Phi += 3.0 * dt; + 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(); +} + +static void +key(unsigned char k, int x, int y) +{ + (void) x; + (void) y; + switch (k) { + case 27: /* Escape */ + exit(0); + break; + default: + return; + } + glutPostRedisplay(); +} + +int main( int argc, char *argv[] ) +{ + glutInit( &argc, argv ); + glutInitWindowPosition(0, 0); + glutInitWindowSize( 400, 400 ); + + glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE ); + + glutCreateWindow(argv[0]); + + Init(); + + glutIdleFunc( Idle ); + glutReshapeFunc( Reshape ); + glutDisplayFunc( Display ); + glutKeyboardFunc(key); + + glutCreateMenu(ModeMenu); + glutAddMenuEntry("Unscaled", UNSCALED); + glutAddMenuEntry("Normalize", NORMALIZE); + glutAddMenuEntry("Rescale EXT", RESCALE); + glutAddMenuEntry("Quit", QUIT); + glutAttachMenu(GLUT_RIGHT_BUTTON); + + glutMainLoop(); + return 0; +} |