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https://bugs.freedesktop.org/show_bug.cgi?id=7984
Summary: Display lists cause GL_INVALID_OPERATION when
glGetError() called if GL_COMPILE_AND_EXECUTE used with
large lists
Product: Mesa
Version: 6.4
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Mesa core
AssignedTo: [email protected]
ReportedBy: [EMAIL PROTECTED]
Ok this one is really obscure...
If you use Mesa to build a display list using GL_COMPILE_AND_EXECUTE and call
glGetError() inside the list then glGetError() returns GL_INVALID_OPERATION
after calling glEndList(). Also the list needs to contain a large number of
commands.
This was discovered using the Python OpenGL bindings - they call glGetError()
frequently and generate an exception if an error has occured.
I'm really not sure what is going but here are some hints I have been picking
up:
o The bug seems to be based on the number of commands in the display list, i.e.
if you replace the triangles with GL_QUADS then only approx. 1000 * 3 / 4 = 750
iterations are required.
o By using less vertices the bug still occurs if the display list is built
multiple times - it appears it occurs when the total number of commands hits a
threshold of approx. 3000.
Architecture: Intel Pentium 4 (at least two types), AMD XP2000+
OS: Ubuntu 6.06
Repeatable: Always
Occurs in versions: 6.4.1 (from Ubuntu 6.06) and 6.4.2 (from Mesa sf.net page).
Does not occur in ATI fglrx Linux drivers.
Here is a basic example that generates the error:
glNewList(4, GL_COMPILE_AND_EXECUTE); // Must be GL_COMPILE_AND_EXECUTE
glBegin(GL_TRIANGLES);
for(i = 0; i < 1000; i++) // Must be 1000 triangles in one frame to occur
{
glVertex3f(-0.8, -0.8, 1.0);
glVertex3f(0.8, -0.8, 1.0);
glVertex3f(0.0, 0.8, 1.0);
}
glGetError();
glEnd();
glEndList();
printf("Error=%i\n", glGetError()); // Prints "Error = 1282"
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