-/* $Id$
-
-This file is part of libmspgl
-Copyright © 2007 Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
+#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)
+ usage(STATIC_DRAW),
+ size(0)
{
- 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");
+ require_buffer_type(type);
glGenBuffersARB(1, &id);
}
glDeleteBuffersARB(1, &id);
}
-void Buffer::bind(BufferType t) const
+void Buffer::require_buffer_type(BufferType type)
{
- glBindBufferARB(t, id);
- binding(t) = this;
+ 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");
}
-void Buffer::maybe_bind() const
+void Buffer::set_usage(BufferUsage u)
{
- if(binding(type)!=this)
- bind();
+ usage = u;
}
-void Buffer::set_usage(BufferUsage u)
+void Buffer::data(unsigned sz, const void *d)
{
- usage = u;
+ const Buffer *old = current(type);
+ bind();
+ glBufferDataARB(type, sz, d, usage);
+ size = sz;
+ restore(old, type);
}
-void Buffer::data(unsigned size, const void *d)
+void Buffer::sub_data(unsigned off, unsigned sz, const void *d)
{
- maybe_bind();
- glBufferDataARB(type, size, d, usage);
+ const Buffer *old = current(type);
+ bind();
+ glBufferSubDataARB(type, off, sz, d);
+ restore(old, type);
}
-void Buffer::sub_data(unsigned offset, unsigned size, const void *d)
+void Buffer::bind_to(BufferType t) const
{
- maybe_bind();
- glBufferSubDataARB(type, offset, size, d);
+ if(t!=type)
+ require_buffer_type(t);
+ if(set_current(t, this))
+ glBindBufferARB(t, id);
}
-void Buffer::unbind(BufferType type)
+void Buffer::unbind_from(BufferType type)
{
- const Buffer *&ptr = binding(type);
- if(ptr)
- {
+ if(set_current(type, 0))
glBindBufferARB(type, 0);
- ptr = 0;
- }
}
const Buffer *&Buffer::binding(BufferType type)
case ELEMENT_ARRAY_BUFFER: return bound[1];
case PIXEL_PACK_BUFFER: return bound[2];
case PIXEL_UNPACK_BUFFER: return bound[3];
- default: throw InvalidParameterValue("Invalid buffer type");
+ default: throw invalid_argument("Buffer::binding");
}
}
-const Buffer *Buffer::bound[4] = { 0, 0, 0, 0 };
+bool Buffer::set_current(BufferType type, const Buffer *buf)
+{
+ const Buffer *&ptr = binding(type);
+ if(ptr==buf)
+ return false;
+
+ ptr = buf;
+ return true;
+}
+
+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