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authorBrian <brian.paul@tungstengraphics.com>2007-08-13 13:57:31 -0600
committerBrian <brian.paul@tungstengraphics.com>2007-08-13 14:00:03 -0600
commitb7693ee5594e13f56a83230ce6ca61f23f1b5343 (patch)
treeabb464cde702532c6c75cb5cc4ef243a2853a710 /progs
parent21b9b8b74ec0975296d22493254875c0deb7b6da (diff)
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Draw white square in lower-left corner to test orientation
Diffstat (limited to 'progs')
-rw-r--r--progs/trivial/readpixels.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/progs/trivial/readpixels.c b/progs/trivial/readpixels.c
index b1f04f8..65fb81e 100644
--- a/progs/trivial/readpixels.c
+++ b/progs/trivial/readpixels.c
@@ -57,6 +57,14 @@ static void Draw(void)
glVertex3f( 0.0, 0.9, -30.0);
glEnd();
+ glBegin(GL_QUADS);
+ glColor3f(1, 1, 1);
+ glVertex2f(-1.0, -1.0);
+ glVertex2f(-0.9, -1.0);
+ glVertex2f(-0.9, -0.9);
+ glVertex2f(-1.0, -0.9);
+ glEnd();
+
glReadPixels(0, 0, Width, Height, GL_RGBA, GL_FLOAT, image);
printf("Pixel(0,0) = %f, %f, %f, %f\n",
image[0], image[1], image[2], image[3]);