guest@slax:~/source/rendercheck$ rendercheck 
Render extension version 0.10
Window format: r8g8b8
Found server-supported format: a8
Found server-supported format: a8r8g8b8
Found server-supported format: x8r8g8b8
Found server-supported format: r8g8b8
Found server-supported format: b8g8r8
Found server-supported format: r5g5b5
Found server-supported format: b5g5r5
Found server-supported format: x1r5g5b5
Found server-supported format: x1b5g5r5
Found server-supported format: r5g6b5
Found server-supported format: b5g6r5
Found server-supported format: x8b8g8r8
Beginning testing of filling of 1x1R pictures
Beginning testing of filling of 10x10 pictures
Beginning dest coords test
Beginning src coords test
Beginning mask coords test
Beginning transformed src coords test
Beginning transformed src coords test 2
src coords test error of 64.0000 at (3, 1) --
           R    G    B    A
got:       1.00 1.00 1.00 1.00
expected:  1.00 0.00 0.00 1.00
src coords test error of 64.0000 at (3, 2) --
           R    G    B    A
got:       1.00 0.00 0.00 1.00
expected:  1.00 1.00 1.00 1.00
src coords test error of 64.0000 at (1, 3) --
           R    G    B    A
got:       1.00 0.00 0.00 1.00
expected:  1.00 1.00 1.00 1.00
src coords test error of 64.0000 at (2, 3) --
           R    G    B    A
got:       1.00 1.00 1.00 1.00
expected:  1.00 0.00 0.00 1.00
expected vs tested:
11111 11111
10011 10001
10101 10111
10101 11001
11111 11111
Beginning transformed mask coords test
Beginning transformed mask coords test 2
Beginning Clear blend test on a8
Beginning Clear blend test on a8r8g8b8
Beginning Clear blend test on x8r8g8b8
Beginning Clear blend test on r8g8b8