Re: glInterleavedArrays locks vertex memory?

jbwest schrieb:
"Ralph Kern" <usenet03@xxxxxxxx> wrote in message news:g7u8hq$ioa$1@xxxxxxxxxxxx
hi,

i have the following problem on a NVidia Quadro FX1700:
After using glInterleavedArrays and glDrawArrays the vertex field is write protected.

Driver: ForceWare 169.96, WinXP SP2

my code is:

glInterleavedArrays(GL_V3F, 0, &light->gl->aVert[0]);
for (s = 0; s < light->gl->aShellTrans.size(); s++)
{
Card32 nFirst = light->gl->aShellTrans[s].nFirst;
Card32 nLast = nFirst+light->gl->aShellTrans[s].nDraw;

SetupTrans(light->gl->aShellTrans[s].rShell, &info);
for (i = nFirst; i < nLast; i++)
{
glDrawArrays(light->gl->aDraw[i].mode, light->gl->aDraw[i].first, light->gl->aDraw[i].count);
}
glPopMatrix();
}

The aVert field is a std::vector of a xyz float struct.

After that any write acess on the vertex field gives "access violation". ie. light->gl->aVert[0].x = 0.0;

I tried to unlock using several commands, but with no use:

glInterleavedArrays(GL_V3F, 0, NULL);
glDisableClientState(GL_VERTEX_ARRAY);
glVertexPointer(4,GL_FLOAT,0,NULL);
glFinish();

Is that expected behaviour? Any tip for me?

thanks in advance
Ralph Kern



use a tool to check for a program memory bug, methinks you have one.

jbw



no, I checked the page access protection using VirtualQuery() Win32 API, and it clearly shows the protection changes from PAGE_READWRITE to PAGE_READONLY.

I nowhere use any write protected pages, so it's obviously done by the driver. The vertex field is just a std::vector<>.

In addition it is also happening when I replace the glInterleavedArrays/glDrawArrays by glBegin/glVertex3fv(&)/glEnd.

It doesn't happen when I use glBegin/glVertex3f(x,y,z)/glEnd. (Clearly the driver then does not know where my vertices are...)

regards Ralph

.

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