3 files changed, 19 insertions, 3 deletions
diff --git a/progs/tests/fbotest1.c b/progs/tests/fbotest1.c
index 8dac21494e6..0cd7f95c355 100644
--- a/progs/tests/fbotest1.c
+++ b/progs/tests/fbotest1.c
@@ -127,7 +127,7 @@ Init( void )
 
    if (!glutExtensionSupported("GL_EXT_framebuffer_object")) {
       printf("GL_EXT_framebuffer_object not found!\n");
-      /*exit(0);*/
+      exit(0);
    }
    printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
 
diff --git a/progs/tests/texcmp.c b/progs/tests/texcmp.c
index 52c504a3188..d1e829d1b73 100644
--- a/progs/tests/texcmp.c
+++ b/progs/tests/texcmp.c
@@ -371,11 +371,11 @@ int main( int argc, char *argv[] )
    glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
 
    if (glutCreateWindow(argv[0]) <= 0) {
-      glewInit();
       printf("Couldn't create window\n");
       exit(0);
    }
 
+   glewInit();
    gl_version = atof( (const char *) glGetString( GL_VERSION ) );
    if ( (gl_version < 1.3) 
 	&& !glutExtensionSupported("GL_ARB_texture_compression") ) {
diff --git a/progs/tests/zreaddraw.c b/progs/tests/zreaddraw.c
index 2cbfeb6ff18..0821d5fb357 100644
--- a/progs/tests/zreaddraw.c
+++ b/progs/tests/zreaddraw.c
@@ -12,6 +12,7 @@
 #include <GL/glut.h>
 
 static GLint WinWidth = 500, WinHeight = 500;
+static GLboolean Invert = GL_FALSE;
 
 
 static void Display(void)
@@ -24,6 +25,8 @@ static void Display(void)
    glClearColor(0.5, 0.5, 0.5, 1.0);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
+   glEnable(GL_DEPTH_TEST);
+
    /* draw a sphere */
    glViewport(0, 0, 100, 100);
    glMatrixMode(GL_PROJECTION);
@@ -46,8 +49,19 @@ static void Display(void)
 
    /* draw depth image with scaling (into z buffer) */
    glPixelZoom(4.0, 4.0);
+   glColor4f(1, 0, 0, 0);
    glWindowPos2i(100, 0);
+   if (Invert) {
+      glPixelTransferf(GL_DEPTH_SCALE, -1.0);
+      glPixelTransferf(GL_DEPTH_BIAS, 1.0);
+   }
    glDrawPixels(100, 100, GL_DEPTH_COMPONENT, GL_FLOAT, depth);
+   if (Invert) {
+      glPixelTransferf(GL_DEPTH_SCALE, 1.0);
+      glPixelTransferf(GL_DEPTH_BIAS, 0.0);
+   }
+
+   glDisable(GL_DEPTH_TEST);
 
    /* read back scaled depth image */
    glReadPixels(100, 0, 400, 400, GL_DEPTH_COMPONENT, GL_FLOAT, depth2);
@@ -72,6 +86,9 @@ static void Key(unsigned char key, int x, int y)
    (void) x;
    (void) y;
    switch (key) {
+      case 'i':
+         Invert = !Invert;
+         break;
       case 27:
          exit(0);
          break;
@@ -96,7 +113,6 @@ static void Init(void)
    glLightfv(GL_LIGHT0, GL_POSITION, pos);
    glEnable(GL_LIGHTING);
    glEnable(GL_LIGHT0);
-   glEnable(GL_DEPTH_TEST);
 }