X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fcore%2Fbuffer.cpp;h=56810b6f4ff12aa41f9c37b7812f5d4496187e7a;hb=096481bcb88844ec28fd33147ed5010bfe2e15d9;hp=56705b8701b88a00b691bf25725d10042554679a;hpb=7aaec9a70b8d7733429bec043f8e33e02956f266;p=libs%2Fgl.git

diff --git a/source/core/buffer.cpp b/source/core/buffer.cpp
index 56705b87..56810b6f 100644
--- a/source/core/buffer.cpp
+++ b/source/core/buffer.cpp
@@ -18,7 +18,8 @@ BufferType buffer_types[] = { ARRAY_BUFFER, ELEMENT_ARRAY_BUFFER, PIXEL_PACK_BUF
 
 Buffer::Buffer(BufferType t):
 	type(t),
-	size(0)
+	size(0),
+	allocated(false)
 {
 	require_buffer_type(type);
 
@@ -53,6 +54,15 @@ void Buffer::storage(unsigned sz)
 		throw invalid_argument("Buffer::storage");
 
 	size = sz;
+}
+
+void Buffer::allocate()
+{
+	if(size==0)
+		throw invalid_operation("Buffer::allocate");
+	if(allocated)
+		return;
+
 	if(ARB_buffer_storage)
 	{
 		static const int flags = GL_MAP_READ_BIT|GL_MAP_WRITE_BIT|GL_DYNAMIC_STORAGE_BIT;
@@ -63,7 +73,11 @@ void Buffer::storage(unsigned sz)
 			BindRestore _bind(this, type);
 			glBufferStorage(type, size, 0, flags);
 		}
+
+		allocated = true;
 	}
+	else
+		data(0);
 }
 
 void Buffer::set_usage(BufferUsage)
@@ -85,6 +99,8 @@ void Buffer::data(const void *d)
 		BindRestore _bind(this, type);
 		glBufferData(type, size, d, STATIC_DRAW);
 	}
+
+	allocated = true;
 }
 
 void Buffer::data(unsigned sz, const void *d)
@@ -99,6 +115,11 @@ void Buffer::data(unsigned sz, const void *d)
 
 void Buffer::sub_data(unsigned off, unsigned sz, const void *d)
 {
+	if(size==0)
+		throw invalid_operation("Buffer::sub_data");
+
+	allocate();
+
 	if(ARB_direct_state_access)
 		glNamedBufferSubData(id, off, sz, d);
 	else