diff options
| -rw-r--r-- | progs/tests/zreaddraw.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/progs/tests/zreaddraw.c b/progs/tests/zreaddraw.c index 8839e108360..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) @@ -50,7 +51,15 @@ static void Display(void) 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); @@ -77,6 +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; |