added pixelzoom cmd line opt

1 files changed, 5 insertions, 0 deletions

diff --git a/progs/trivial/readpixels.c b/progs/trivial/readpixels.c
index 65fb81e..783468a 100644
--- a/progs/trivial/readpixels.c
+++ b/progs/trivial/readpixels.c
@@ -10,6 +10,7 @@
 #include <GL/glut.h>
 
 static int Width = 250, Height = 250;
+static GLfloat Zoom = 1.0;
 
 static void Init(void)
 {
@@ -70,6 +71,7 @@ static void Draw(void)
           image[0], image[1], image[2], image[3]);
    /* draw to right half of window */
    glWindowPos2iARB(Width, 0);
+   glPixelZoom(Zoom, Zoom);
    glDrawPixels(Width, Height, GL_RGBA, GL_FLOAT, image);
    free(image);
 
@@ -86,6 +88,9 @@ int main(int argc, char **argv)
       exit(1);
    }
 
+   if (argc > 1)
+      Zoom = atof(argv[1]);
+
    Init();
 
    glutReshapeFunc(Reshape);