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Draw white square in lower-left corner to test orientation

This commit is contained in:
Brian 2007-08-13 13:57:31 -06:00
parent 21b9b8b74e
commit b7693ee559
1 changed files with 8 additions and 0 deletions
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8
progs/trivial/readpixels.c
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@ -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]);