-#include <stdexcept>
-#include "arb_vertex_buffer_object.h"
-#include "extension.h"
-#include "buffer.h"
-
-using namespace std;
-
-namespace Msp {
-namespace GL {
-
-const Buffer *Buffer::bound[4] = { 0, 0, 0, 0 };
-
-Buffer::Buffer(BufferType t):
- type(t),
- usage(STATIC_DRAW)
-{
- static RequireExtension _req_vbo("GL_ARB_vertex_buffer_object");
- if(type==PIXEL_PACK_BUFFER || type==PIXEL_UNPACK_BUFFER)
- static RequireExtension _req_pbo("GL_ARB_pixel_buffer_object");
-
- glGenBuffersARB(1, &id);
-}
-
-Buffer::~Buffer()
-{
- glDeleteBuffersARB(1, &id);
-}
-
-void Buffer::set_usage(BufferUsage u)
-{
- usage = u;
-}
-
-void Buffer::data(unsigned size, const void *d)
-{
- const Buffer *old = current(type);
- bind();
- glBufferDataARB(type, size, d, usage);
- restore(old, type);
-}
-
-void Buffer::sub_data(unsigned offset, unsigned size, const void *d)
-{
- const Buffer *old = current(type);
- bind();
- glBufferSubDataARB(type, offset, size, d);
- restore(old, type);
-}
-
-void Buffer::bind_to(BufferType t) const
-{
- const Buffer *&ptr = binding(t);
- if(ptr!=this)
- {
- glBindBufferARB(t, id);
- ptr = this;
- }
-}
-
-void Buffer::unbind_from(BufferType type)
-{
- const Buffer *&ptr = binding(type);
- if(ptr)
- {
- glBindBufferARB(type, 0);
- ptr = 0;
- }
-}
-
-const Buffer *&Buffer::binding(BufferType type)
-{
- switch(type)
- {
- case ARRAY_BUFFER: return bound[0];
- case ELEMENT_ARRAY_BUFFER: return bound[1];
- case PIXEL_PACK_BUFFER: return bound[2];
- case PIXEL_UNPACK_BUFFER: return bound[3];
- default: throw invalid_argument("Buffer::binding");
- }
-}
-
-void Buffer::restore(const Buffer *buf, BufferType type)
-{
- if(buf!=current(type))
- {
- if(buf)
- buf->bind_to(type);
- else
- unbind_from(type);
- }
-}
-
-} // namespace GL
-} // namespace Msp