diff options
| -rw-r--r-- | progs/tests/invert.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/progs/tests/invert.c b/progs/tests/invert.c index 5f196c9817..750592ed79 100644 --- a/progs/tests/invert.c +++ b/progs/tests/invert.c @@ -56,6 +56,9 @@ PFNGLWINDOWPOS2IPROC win_pos_2i = NULL; static void Display( void ) { + GLint err; + + glClearColor(0.2, 0.2, 0.8, 0); glClear( GL_COLOR_BUFFER_BIT ); @@ -67,11 +70,23 @@ static void Display( void ) glDrawPixels( img_width, img_height, img_format, GL_UNSIGNED_BYTE, image ); glPixelStorei( GL_PACK_INVERT_MESA, GL_FALSE ); + err = glGetError(); + if ( err != GL_NO_ERROR ) { + printf( "Setting PACK_INVERT_MESA to false generated an error (0x%04x).\n", + err ); + } + glReadPixels( 5, 5, img_width, img_height, img_format, GL_UNSIGNED_BYTE, temp_image ); (*win_pos_2i)( 5 + 1 * (10 + img_width), 5 ); glDrawPixels( img_width, img_height, img_format, GL_UNSIGNED_BYTE, temp_image ); glPixelStorei( GL_PACK_INVERT_MESA, GL_TRUE ); + err = glGetError(); + if ( err != GL_NO_ERROR ) { + printf( "Setting PACK_INVERT_MESA to true generated an error (0x%04x).\n", + err ); + } + glReadPixels( 5, 5, img_width, img_height, img_format, GL_UNSIGNED_BYTE, temp_image ); (*win_pos_2i)( 5 + 2 * (10 + img_width), 5 ); glDrawPixels( img_width, img_height, img_format, GL_UNSIGNED_BYTE, temp_image ); |