I am trying to fill buffers using glMapBufferRange with GL_MAP_FLUSH_EXPLICIT_BIT option. In my case I need to map array buffer and element buffer at the same time. But it doesn't work on Visual Studio (Windows 7 64 bit): access violation error is generated. I checked all lines using GetError and found no errors. The same code perfectly works on XCode under ios. So I am absolutely sure that all variables and content of the both buffers are correct. If I remove GL_MAP_FLUSH_EXPLICIT_BIT it works perfectly. If I map array buffer only (fill element buffer using glBufferData) it works even with GL_MAP_FLUSH_EXPLICIT_BIT option.
So it looks like for me that the problem is in drivers.
I have Radeon HD 6450M card. Driver version 8.801.2.3000. I tried to update the driver from amd site. But it resulted in unstable work and I uninstalled it.
Tree->Fillbuffers(
(BAV_Tree::vertsTrunk*)glMapBufferRange(
GL_ARRAY_BUFFER,
0,
MAXVERTS*sizeof(BAV_Tree::vertsTrunk),
GL_MAP_WRITE_BIT | GL_MAP_FLUSH_EXPLICIT_BIT),
(unsigned int*)glMapBufferRange(
GL_ELEMENT_ARRAY_BUFFER,
0,
2 * MAXVERTS*sizeof(unsigned int),
GL_MAP_WRITE_BIT | GL_MAP_FLUSH_EXPLICIT_BIT));
glFlushMappedBufferRange(
GL_ARRAY_BUFFER,
Tree->tbpos*sizeof(BAV_Tree::vertsTrunk),
(Tree->nverts - Tree->tbpos)*sizeof(BAV_Tree::vertsTrunk));
glFlushMappedBufferRange(
GL_ELEMENT_ARRAY_BUFFER,
Tree->tebpos*sizeof(unsigned int),
(Tree->ninds - Tree->tebpos)*sizeof(unsigned int));
glUnmapBuffer(GL_ARRAY_BUFFER);
glUnmapBuffer(GL_ELEMENT_ARRAY_BUFFER);
