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-rw-r--r--progs/tests/fogcoord.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/progs/tests/fogcoord.c b/progs/tests/fogcoord.c
new file mode 100644
index 00000000000..89355742aad
--- /dev/null
+++ b/progs/tests/fogcoord.c
@@ -0,0 +1,102 @@
+/*
+ * 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);
+ printf("glFogCoord(%4.1f)\n", f);
+ 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 )
+{
+ printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
+ printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
+ /* 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;
+}