diff options
Diffstat (limited to 'progs')
-rw-r--r-- | progs/tests/fogcoord.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/progs/tests/fogcoord.c b/progs/tests/fogcoord.c new file mode 100644 index 0000000000..e5a24d865a --- /dev/null +++ b/progs/tests/fogcoord.c @@ -0,0 +1,99 @@ +/* + * Exercise GL_EXT_fog_coord + */ + + +#define GL_GLEXT_PROTOTYPES +#include <stdio.h> +#include <stdlib.h> +#include <math.h> +#include <GL/glut.h> + +static int Width = 600; +static int Height = 200; +static GLfloat Near = 5.0, Far = 25.0; + + +static void Display( void ) +{ + GLfloat t; + + glClearColor(0.2, 0.2, 0.8, 0); + glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); + + for (t = 0.0; t <= 1.0; t += 0.25) { + GLfloat f = -(Near + t * (Far - Near)); + glFogCoordfEXT(f); + + glPushMatrix(); + glTranslatef(t * 10.0 - 5.0, 0, 0); + glBegin(GL_POLYGON); + glVertex2f(-1, -1); + glVertex2f( 1, -1); + glVertex2f( 1, 1); + glVertex2f(-1, 1); + glEnd(); + glPopMatrix(); + } + glutSwapBuffers(); +} + + +static void Reshape( int width, int height ) +{ + GLfloat ar = (float) width / (float) height; + Width = width; + Height = height; + glViewport( 0, 0, width, height ); + glMatrixMode( GL_PROJECTION ); + glLoadIdentity(); + glFrustum( -ar, ar, -1.0, 1.0, Near, Far ); + glMatrixMode( GL_MODELVIEW ); + glLoadIdentity(); + glTranslatef( 0.0, 0.0, -15.0 ); +} + + +static void Key( unsigned char key, int x, int y ) +{ + (void) x; + (void) y; + switch (key) { + case 27: + exit(0); + break; + } + glutPostRedisplay(); +} + + +static void Init( void ) +{ + /* setup lighting, etc */ + if (!glutExtensionSupported("GL_EXT_fog_coord")) { + printf("Sorry, this program requires GL_EXT_fog_coord\n"); + exit(1); + } + glFogi(GL_FOG_COORDINATE_SOURCE_EXT, GL_FOG_COORDINATE_EXT); + glFogi(GL_FOG_MODE, GL_LINEAR); + glFogf(GL_FOG_START, Near); + glFogf(GL_FOG_END, Far); + glEnable(GL_FOG); + printf("Squares should be colored from white -> gray -> black.\n"); +} + + +int main( int argc, char *argv[] ) +{ + glutInit( &argc, argv ); + glutInitWindowPosition( 0, 0 ); + glutInitWindowSize( Width, Height ); + glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH ); + glutCreateWindow(argv[0]); + glutReshapeFunc( Reshape ); + glutKeyboardFunc( Key ); + glutDisplayFunc( Display ); + Init(); + glutMainLoop(); + return 0; +} |