Add CommandBuffer, manages the stream of API independent commands buffer

engine/renderers/CommandBuffer.h

@@ -0,0 +1,125 @@
+/*
+Copyright (c) 2013 Daniele Bartolini, Michele Rossi
+Copyright (c) 2012 Daniele Bartolini, Simone Boscaratto
+
+Permission is hereby granted, free of charge, to any person
+obtaining a copy of this software and associated documentation
+files (the "Software"), to deal in the Software without
+restriction, including without limitation the rights to use,
+copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#pragma once
+
+#include "Assert.h"
+
+namespace crown
+{
+
+#define MAX_COMMAND_BUFFER_SIZE 1024 * 1024
+
+enum CommandType
+{
+	COMMAND_INIT_RENDERER,
+	COMMAND_SHUTDOWN_RENDERER,
+
+	COMMAND_CREATE_VERTEX_BUFFER,
+	COMMAND_UPDATE_VERTEX_BUFFER,
+	COMMAND_DESTROY_VERTEX_BUFFER,
+
+	COMMAND_CREATE_INDEX_BUFFER,
+	COMMAND_DESTROY_INDEX_BUFFER,
+
+	COMMAND_CREATE_TEXTURE,
+	COMMAND_UPDATE_TEXTURE,
+	COMMAND_DESTROY_TEXTURE,
+
+	COMMAND_CREATE_SHADER,
+	COMMAND_DESTROY_SHADER,
+
+	COMMAND_CREATE_GPU_PROGRAM,
+	COMMAND_DESTROY_GPU_PROGRAM,
+
+	COMMAND_CREATE_UNIFORM,
+	COMMAND_DESTROY_UNIFORM,
+
+	COMMAND_END
+};
+
+class CommandBuffer
+{
+public:
+
+	//-----------------------------------------------------------------------------
+	CommandBuffer() : m_size(0)
+	{
+		// Ensure at least a command is in queue
+		commit();
+	}
+
+	//-----------------------------------------------------------------------------
+	void clear()
+	{
+		m_size = 0;
+	}
+
+	//-----------------------------------------------------------------------------
+	template<typename T>
+	void write(const T type)
+	{
+		write((void*)&type, sizeof(T));
+	}
+
+	template<typename T>
+	void read(T& data)
+	{
+		read((void*)&data, sizeof(T));
+	}
+
+	//-----------------------------------------------------------------------------
+	void write(void* data, size_t size)
+	{
+		CE_ASSERT(m_size + size < MAX_COMMAND_BUFFER_SIZE, "CommandBuffer overflow");
+
+		memcpy(&m_buffer[m_size], data, size);
+		m_size += size;
+	}
+
+	//-----------------------------------------------------------------------------
+	void read(void* data, size_t size)
+	{
+		CE_ASSERT(m_size + size < MAX_COMMAND_BUFFER_SIZE, "Reading beyond buffer");
+		
+		memcpy(data, &m_buffer[m_size], size);
+		m_size += size;
+	}
+
+	//-----------------------------------------------------------------------------
+	void commit()
+	{
+		write(COMMAND_END);
+		m_size = 0;
+	}
+
+public:
+
+	size_t	m_size;
+	char	m_buffer[MAX_COMMAND_BUFFER_SIZE];
+};
+
+} // namespace crown