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void MP_Atlas_WRAP::EndDrawParticles()
{
int k_particles=buffer.GetCount();
if (k_particles)
{
glBindTexture(GL_TEXTURE_2D,texture);

glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);

OPENGL_VERTEX* ar=buffer.GetArray();

GLsizei step=sizeof(OPENGL_VERTEX);

float* first_x=&(ar->x);

#ifdef MAGIC_3D
glVertexPointer(3,GL_FLOAT,step,first_x);
#else
glVertexPointer(2,GL_FLOAT,step,first_x);
#endif

float* first_u=&(ar->u);
glTexCoordPointer(2,GL_FLOAT,step,first_u);

GLuint* first_color=&(ar->color);
glColorPointer(4,GL_UNSIGNED_BYTE,step,first_color);

glDrawArrays(GL_QUADS,0,k_particles*4);//ERROR

buffer.Clear();

glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisableClientState(GL_COLOR_ARRAY);
}
}

C++ debug k_particles = 1109;

Not all versions of OpenGL work with GL_QUADS. Some versions work with triangles only.

I use glgeterror() and the return value is GL_INVALID_VALUE. If I use particle and MS3D in the same game, the error will happen.If I use them separately,that will be OK!

Unfortunately, I do not understand your problem. If you have got the problem with the line glDrawArrays(GL_QUADS,0,k_particles*4), I can remake the wrapper of OpenGL for triangles.