From: Mikko Rasa <tdb@tdb.fi>
Date: Thu, 23 Aug 2012 09:32:30 +0000 (+0300)
Subject: Keep track of buffer size
X-Git-Url: http://git.tdb.fi/?a=commitdiff_plain;h=196093790e242dec24bfbbf7ad8c28dcc442824c;p=libs%2Fgl.git

Keep track of buffer size
---

diff --git a/source/buffer.cpp b/source/buffer.cpp
index e033871f..c19f3727 100644
--- a/source/buffer.cpp
+++ b/source/buffer.cpp
@@ -12,7 +12,8 @@ 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)
@@ -31,19 +32,20 @@ void Buffer::set_usage(BufferUsage u)
 	usage = u;
 }
 
-void Buffer::data(unsigned size, const void *d)
+void Buffer::data(unsigned sz, const void *d)
 {
 	const Buffer *old = current(type);
 	bind();
-	glBufferDataARB(type, size, d, usage);
+	glBufferDataARB(type, sz, d, usage);
+	size = sz;
 	restore(old, type);
 }
 
-void Buffer::sub_data(unsigned offset, unsigned size, const void *d)
+void Buffer::sub_data(unsigned off, unsigned sz, const void *d)
 {
 	const Buffer *old = current(type);
 	bind();
-	glBufferSubDataARB(type, offset, size, d);
+	glBufferSubDataARB(type, off, sz, d);
 	restore(old, type);
 }
 
diff --git a/source/buffer.h b/source/buffer.h
index 5e3cd29a..d8a8419c 100644
--- a/source/buffer.h
+++ b/source/buffer.h
@@ -38,6 +38,7 @@ private:
 	BufferType type;
 	BufferUsage usage;
 	unsigned id;
+	unsigned size;
 
 	static const Buffer *bound[4];
 
@@ -61,6 +62,8 @@ public:
 	not be changed with this call. */
 	void sub_data(unsigned, unsigned, const void *);
 
+	unsigned get_size() const { return size; }
+
 	/** Binds the buffer in its default slot. */
 	void bind() const { bind_to(type); }