create StreamBuffer class for ogl upload

Source/Plugins/Plugin_VideoOGL/Src/StreamBuffer.cpp

@@ -0,0 +1,91 @@
+// Copyright (C) 2003 Dolphin Project.
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, version 2.0.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License 2.0 for more details.
+
+// A copy of the GPL 2.0 should have been included with the program.
+// If not, see http://www.gnu.org/licenses/
+
+// Official SVN repository and contact information can be found at
+// http://code.google.com/p/dolphin-emu/
+
+
+#include "Globals.h"
+#include "GLUtil.h"
+#include "StreamBuffer.h"
+
+namespace OGL
+{
+
+StreamBuffer::StreamBuffer(u32 type, size_t size)
+: m_buffertype(type), m_size(size), m_iterator(0)
+{
+	glGenBuffers(1, &m_buffer);
+	
+	m_uploadtype = MAP_AND_ORPHAN;
+	
+	Init();
+}
+
+StreamBuffer::~StreamBuffer()
+{
+	Shutdown();
+	glDeleteBuffers(1, &m_buffer);
+}
+
+void StreamBuffer::Align ( u32 stride )
+{
+	if(m_iterator) {
+		m_iterator--;
+		m_iterator = m_iterator - (m_iterator % stride) + stride;
+	}
+}
+
+size_t StreamBuffer::Upload ( u8* data, size_t size )
+{
+	switch(m_uploadtype) {
+	case MAP_AND_ORPHAN:
+		if(m_iterator+size >= m_size) {
+			glBufferData(m_buffertype, m_size, NULL, GL_STREAM_DRAW);
+			m_iterator = 0;
+		}
+		pointer = (u8*)glMapBufferRange(m_buffertype, m_iterator, size, GL_MAP_WRITE_BIT | GL_MAP_UNSYNCHRONIZED_BIT);
+		if(pointer) {
+			memcpy(pointer, data, size);
+			glUnmapBuffer(m_buffertype);
+		} else {
+			ERROR_LOG(VIDEO, "buffer mapping failed");
+		}
+		break;
+	}
+	size_t ret = m_iterator;
+	m_iterator += size;
+	return ret;
+}
+
+
+void StreamBuffer::Init()
+{
+	switch(m_uploadtype) {
+	case MAP_AND_ORPHAN:
+		glBindBuffer(m_buffertype, m_buffer);
+		glBufferData(m_buffertype, m_size, NULL, GL_STREAM_DRAW);
+		break;
+	}
+}
+
+void StreamBuffer::Shutdown()
+{
+	switch(m_uploadtype) {
+	case MAP_AND_ORPHAN:
+		break;
+	}
+}
+
+}