X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fbuffer.cpp;h=1762b20482eaa45944d94529b7c044aa25c898b5;hb=a4f59a729cb9d8183ad8fc050d7bc163abfd55e8;hp=c19f3727f8f5c685a2ab5abc761a0293c3aa7c85;hpb=196093790e242dec24bfbbf7ad8c28dcc442824c;p=libs%2Fgl.git

diff --git a/source/buffer.cpp b/source/buffer.cpp
index c19f3727..1762b204 100644
--- a/source/buffer.cpp
+++ b/source/buffer.cpp
@@ -15,9 +15,7 @@ Buffer::Buffer(BufferType t):
 	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);
 }
@@ -27,6 +25,13 @@ Buffer::~Buffer()
 	glDeleteBuffersARB(1, &id);
 }
 
+void Buffer::require_buffer_type(BufferType type)
+{
+	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::set_usage(BufferUsage u)
 {
 	usage = u;
@@ -51,22 +56,16 @@ void Buffer::sub_data(unsigned off, unsigned sz, const void *d)
 
 void Buffer::bind_to(BufferType t) const
 {
-	const Buffer *&ptr = binding(t);
-	if(ptr!=this)
-	{
+	if(t!=type)
+		require_buffer_type(t);
+	if(set_current(t, this))
 		glBindBufferARB(t, id);
-		ptr = this;
-	}
 }
 
 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)
@@ -81,6 +80,16 @@ const Buffer *&Buffer::binding(BufferType type)
 	}
 }
 
+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))