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https://bugs.freedesktop.org/show_bug.cgi?id=8320
Summary: segmentation fault with alpha blended texture mapped
points
Product: Mesa
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Demos
AssignedTo: [email protected]
ReportedBy: [EMAIL PROTECTED]
I have been playing around with mesa a lot recently, and I came across
a
situation that causes a segmentation fault in mesa, it pretty specific,
so this
explains why it has not occured more. I would like to fix
it, but I might
need a few pointers as to what is going on.
Unfortunately it doesn't occur on
my x86 machine, only the amd64.
I am hoping someone who has more experience
with mesa and opengl might
be able to understand what is going on better.
The following things must be set:
glEnable(GL_BLEND);
glEnable(GL_TEXTURE_2D); // with valid glTexImage2D
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
if the min and mag filters are the same, there is no problem,
but if one is
GL_LINEAR, and the other GL_NEAREST, in both cases
there is a crash.
It only occurs if I now draw a point, (and the point has to be visible)
glBegin(GL_POINTS);
glVertex3f(0, 0, -5);
glEnd();
#0 0x00002aaaab548f70 in compute_min_mag_ranges (tObj=0x52d650, n=0,
lambda=0x2aaaac7f7010,
minStart=0x7fffffd8d514, minEnd=0x7fffffd8d510,
magStart=0x7fffffd8d50c,
magEnd=0x7fffffd8d508) at s_texfilter.c:593
#1 0x00002aaaab54bd15 in sample_lambda_2d (ctx=0x502930, tObj=0x52d650, n=0,
texcoords=0x2aaaac777010, lambda=0x2aaaac7f7010, rgba=0x2aaaac89d010) at
s_texfilter.c:1313
#2 0x00002aaaab547415 in _swrast_texture_span (ctx=0x502930,
span=0x547058)
at s_texcombine.c:1129
#3 0x00002aaaab53eccc in
_swrast_write_rgba_span (ctx=0x502930, span=0x547058) at s_span.c:1300
#4 0x00002aaaab536293 in textured_rgba_point (ctx=0x502930, vert=0x2aaaac8be020)
at s_pointtemp.h:236
#5 0x00002aaaab51f8bd in _swrast_validate_point
(ctx=0x502930, v0=0x2aaaac8be020)
at s_context.c:353
#6 0x00002aaaab51ff9b in _swrast_Point (ctx=0x502930, v0=0x2aaaac8be020) at
s_context.c:597
#7 0x00002aaaab584b0e in swsetup_points (ctx=0x502930, first=0,
last=1) at ss_triangle.c:271
#8 0x00002aaaab4aed52 in _tnl_render_points_verts
(ctx=0x502930, start=0, count=1, flags=48)
at t_vb_rendertmp.h:69
#9 0x00002aaaab4b10dc in run_render (ctx=0x502930, stage=0x75ace0) at
t_vb_render.c:320
#10 0x00002aaaab4948da in _tnl_run_pipeline (ctx=0x502930) at t_pipeline.c:159
#11 0x00002aaaab4d9989 in _tnl_flush_vtx (ctx=0x502930) at t_vtx_exec.c:281
#12 0x00002aaaab4d0cec in _tnl_FlushVertices (ctx=0x502930,
flags=1) at t_vtx_api.c:881
#13 0x00002aaaab3a66a7 in _mesa_Flush () at
context.c:1861
#14 0x00002aaaab59daac in glFlush () at glapitemp.h:1170
#15 0x00002aaaaad00ba3 in glutSwapBuffers () at fbdev.c:793
#16 0x0000000000400c8d in display () at alphatexturebug.c:12
#17 0x00002aaaaacffeb2 in glutMainLoop () at fbdev.c:459
#18 0x0000000000400e3e in main (argc=1, argv=0x7fffffd95b48) at
alphatexturebug.c:49
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