In general, you need to know which OpenGL calls are being issued in your
code. This involves digging into the code. There's nothing in the
pixel_buffer_object spec that indicates glMatrixMode would cause an
invalid enum (you can and should verify this in the extension registry
at opengl.org), and I don't experience the error myself. It's possible
the code is using some extension functionality without checking to make
sure your system supports the feature. If this is the case, then please
submit a fix.
Update your device driver. Check your system's supported features with
GLView.
The fact that the error goes away when you add the glGetError call, but
you never trip the assert, implies you have compiled your code with the
asserts disabled. Check your compiler documentation to make sure you've
enabled the asserts. Maybe you built Release mode in Visual Studio, for
example?
Paul Martz
Skew Matrix Software LLC
_http://www.skew-matrix.com_ <http://www.skew-matrix.com/>
+1 303 859 9466
Mark Jones wrote:
How do I track down what is causing this error?
Below is some sample output from running osgScreenCapture with different
options, note that any pbo option causes the error, but I'm sort of at a loss
on figuring out what the error might be.
--no-pbo
Reading window usig glReadPixels, with out PixelBufferObject.
fps = 9.549, full frame copy = 8.4498ms rate = 208.76 Mpixel/sec, copy speed =
597.28 Mb/sec
fps = 9.5965, full frame copy = 8.8676ms rate = 198.93 Mpixel/sec, copy speed
=569.13 Mb/sec
fps = 9.5432, full frame copy = 8.1697ms rate = 215.92 Mpixel/sec, copy speed
=617.75 Mb/sec
fps = 9.5415, full frame copy = 8.6215ms rate = 204.6 Mpixel/sec, copy speed =
585.38 Mb/sec
--single-pbo
Warning: detected OpenGL error 'invalid operation' at start of State::apply()
fps = 59.232, full frame copy = 1.1492ms rate = 1534.9 Mpixel/sec, 4391.4
Mb/sec time for memcpy = 1.1446ms memcpy speed = 4409.4 Mb/sec
Warning: detected OpenGL error 'invalid operation' at start of State::apply()
fps = 57.98, full frame copy = 11.127ms rate = 158.54 Mpixel/sec, 453.57 Mb/sec
time for memcpy = 1.2396ms memcpy speed = 4071.4 Mb/sec
--double-pbo
Warning: detected OpenGL error 'invalid operation' at start of State::apply()
fps = 57.645, full frame copy = 10.735ms rate = 164.32 Mpixel/sec, 470.11
Mb/sec time for memcpy = 1.409ms memcpy speed = 3581.8 Mb/sec
fps = 57.613, full frame copy = 1.1572ms rate = 1524.4 Mpixel/sec, 4361.4
Mb/sec time for memcpy = 1.154ms memcpy speed = 4373.2 Mb/sec
--triple-pbo
Warning: detected OpenGL error 'invalid operation' at start of State::apply()
fps = 59.373, full frame copy = 10.03ms rate = 175.87 Mpixel/sec, 503.17 Mb/sec
time for memcpy = 1.2871ms memcpy speed = 3921.2 Mb/sec
fps = 59.397, full frame copy = 1.122ms rate = 1572.2 Mpixel/sec, 4498 Mb/sec
time for memcpy = 1.1189ms memcpy speed = 4510.6 Mb/sec
Below is the code that "appears" to be causing the problem, however when I add
the glGetError() after each of the gl Calls, then the problem goes away, AND errorNo is
always 0 because the assert never triggers
Code:
inline void applyProjectionMatrix(const osg::RefMatrix* matrix)
{
if (_projection!=matrix)
{
GLenum errorNo = glGetError();
assert(errorNo == 0);
glMatrixMode( GL_PROJECTION );
errorNo = glGetError();
assert(errorNo == 0);
if (matrix)
{
_projection=matrix;
glLoadMatrix(matrix->ptr());
errorNo = glGetError();
assert(errorNo == 0);
}
else
{
_projection=_identity;
glLoadIdentity();
errorNo = glGetError();
assert(errorNo == 0);
}
glMatrixMode( GL_MODELVIEW );
errorNo = glGetError();
assert(errorNo == 0);
}
}
PS, why are there all those goofy characters in the code? I converted all the
tabs to spaces before I pasted the code in!?![/quote]
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=21894#21894
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