http://bugs.freedesktop.org/show_bug.cgi?id=23489
Summary: empty glBegin/glEnd clauses crash
Product: Mesa
Version: unspecified
Platform: Other
URL: https://bugs.launchpad.net/bugs/346072
OS/Version: All
Status: NEW
Severity: normal
Priority: medium
Component: Mesa core
AssignedTo: mesa3d-dev@lists.sourceforge.net
ReportedBy: bugzi07.fdo.tor...@xoxy.net
Created an attachment (id=28886)
--> (http://bugs.freedesktop.org/attachment.cgi?id=28886)
test case
If for instance,
glBegin(GL_LINES);
glEnd();
is repeated (64 times here) mesa will crash with
Program received signal SIGFPE, Arithmetic exception.
0x0109d5a0 in vbo_exec_vtx_flush (exec=0x809fc98, unmap=0 '\0')
because exec->vtx.vertex_size = 0 and we get a division by zero. Not that this
is a useful construct, but it happens in some programs and did not crash
before.
http://www.opengl.org/documentation/specs/man_pages/hardcopy/GL/html/gl/begin.html
says "Lines, triangles, quadrilaterals, and polygons that are
incompletely specified are not drawn."
The attached test program demonstrates the crash (it is based on the example in
http://glprogramming.com/red/chapter01.html :) )
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