2
2
http://www.opengl.org/registry/specs/ARB/copy_buffer.txt
4
3
GL_COPY_READ_BUFFER 0x8F36
5
4
GL_COPY_WRITE_BUFFER 0x8F37
6
5
void glCopyBufferSubData (GLenum readtarget, GLenum writetarget, GLintptr readoffset, GLintptr writeoffset, GLsizeiptr size)