1 files changed, 137 insertions, 0 deletions
diff --git a/Runtime/GfxDevice/opengles30/DataBuffersGLES30.h b/Runtime/GfxDevice/opengles30/DataBuffersGLES30.h
new file mode 100644
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--- /dev/null
+++ b/Runtime/GfxDevice/opengles30/DataBuffersGLES30.h
@@ -0,0 +1,137 @@
+#pragma once
+
+#include "Configuration/UnityConfigure.h"
+#include "Runtime/GfxDevice/GfxDeviceConfigure.h"
+
+#if GFX_SUPPORTS_OPENGLES30
+
+#include "Runtime/GfxDevice/GfxDeviceObjects.h"
+#include "Runtime/GfxDevice/GfxDeviceTypes.h"
+
+class BufferManagerGLES30;
+
+enum
+{
+	kBufferUpdateMinAgeGLES30		= 2 //!< This many frames must be elapsed since last render before next buffer update. \todo [2013-05-31 pyry] From GfxDevice caps
+};
+
+class DataBufferGLES30
+{
+public:
+							DataBufferGLES30		(BufferManagerGLES30& bufferManager);
+							~DataBufferGLES30		(void);
+
+	void					Release					(void); //!< Release to BufferManager.
+
+	UInt32					GetBuffer				(void) const { return m_buffer; }
+	int						GetSize					(void) const { return m_size;	}
+	UInt32					GetUsage				(void) const { return m_usage;	}
+
+	void					RecreateStorage			(int size, UInt32 usage);
+	void					RecreateWithData		(int size, UInt32 usage, const void* data);
+
+	void					Upload					(int offset, int size, const void* data);
+
+	void*					Map						(int offset, int size, UInt32 mapBits);
+	void					FlushMappedRange		(int offset, int size);
+	void					Unmap					(void);
+
+	void					RecordRecreate			(int size, UInt32 usage);	//!< Updates storage parameters and recreate time.
+	void					RecordUpdate			(void);						//!< Updates last update time if buffer was updated manually.
+	void					RecordRender			(void);						//!< Updates last render time.
+
+	UInt32					GetRecreateAge			(void) const;
+	UInt32					GetUpdateAge			(void) const;
+	UInt32					GetRenderAge			(void) const;
+
+	//! Disown and remove buffer handle. Used if destructor should not try to delete buffer..
+	void					Disown					(void);
+
+private:
+							DataBufferGLES30		(const DataBufferGLES30& other);
+	DataBufferGLES30&		operator=				(const DataBufferGLES30& other);
+
+	BufferManagerGLES30&	m_manager;
+	UInt32					m_buffer;
+	int						m_size;
+	UInt32					m_usage;
+
+	// \note Always used to compute relative age and overflow is handled
+	//		 in computation. Thus frame index can safely overflow.
+	UInt32					m_lastRecreated;		//!< Last recreated.
+	UInt32					m_lastUpdated;			//!< Frame index when last updated.
+	UInt32					m_lastRendered;			//!< Frame index when last rendered.
+};
+
+// BufferManager
+//
+// BufferManager is responsible for allocating and maintaining list of free buffer objects that
+// could be recycled later on. Buffers are either allocated or recycled based on their properties.
+// Most important property for proper use of buffers is to make sure they are not recycled
+// too soon after using them for rendering.
+//
+// BufferManager is only responsible for managing currently free buffers. So user must either
+// release or destroy buffer objects manually. User is also responsible of implementing sane
+// usage patterns for buffers that it owns (for example not updating data right after buffer
+// has been submitted for rendering).
+//
+// Buffers are associated to the BufferManager that was used to create them. Thus user must either
+// destroy buffer, or release it back to same BufferManager.
+//
+// The best usage pattern for leveraging BufferManager is to always release buffers when there
+// is no longer need to preserve the data in buffer object. That way BufferManager takes care
+// of recycling buffer when it is appropriate.
+
+class BufferManagerGLES30
+{
+public:
+							BufferManagerGLES30		(void);
+							~BufferManagerGLES30	(void);
+
+	//! Acquire a new or recycled buffer. Returns either buffer object that can fit data, or empty buffer (GetSize() == 0).
+	DataBufferGLES30*		AcquireBuffer			(int size, UInt32 usage);
+	void					ReleaseBuffer			(DataBufferGLES30* buffer);
+
+	void					AdvanceFrame			(void); //!< Advance frame index. Must be called at the end of frame.
+	UInt32					GetFrameIndex			(void) const { return m_frameIndex; }
+
+	//!< Invalidate all owned buffers. Used on context loss.
+	void					InvalidateAll			(void);
+
+private:
+							BufferManagerGLES30		(const BufferManagerGLES30& other);
+	BufferManagerGLES30&	operator=				(const BufferManagerGLES30& other);
+
+	void					Clear					(void);
+
+	void					PruneFreeBuffers		(void);
+	UInt32					GetTotalFreeSize		(void);
+
+	static inline int		GetSizeClassLimit		(int classNdx) { return classNdx+1 < kSizeClassCount ? (1<<(classNdx*kSizeClassStepLog2 + kSizeClassBaseLog2)) : INT_MAX; }
+
+	void					UpdateLiveSetFromPending(void);
+	void					InsertIntoLive			(DataBufferGLES30* buffer);
+	static int				GetSizeClass			(int bufSize);
+
+	UInt32					m_frameIndex;	//!< Frame index for computing buffer ages.
+
+	enum
+	{
+		kSizeClassBaseLog2	= 10,
+		kSizeClassStepLog2	= 1,
+		kSizeClassCount		= 7
+	};
+
+	// Buffers that can not be selected are in pendingBuffers. Live buffers contain
+	// buffers organized by size into kSizeClassCount classes.
+	std::vector<DataBufferGLES30*>	m_pendingBuffers;
+	std::vector<DataBufferGLES30*>	m_liveBuffers[kSizeClassCount];
+};
+
+// \todo [2013-05-10 pyry] Do not use singletons...
+BufferManagerGLES30*	GetBufferManagerGLES30				(void);
+
+//! Determine if buffer update will likely cause GPU stall.
+bool					BufferUpdateCausesStallGLES30		(const DataBufferGLES30* buffer);
+
+#endif // GFX_SUPPORTS_OPENGLES30