1 files changed, 142 insertions, 0 deletions
diff --git a/Runtime/GfxDevice/ShaderConstantCache.h b/Runtime/GfxDevice/ShaderConstantCache.h
new file mode 100644
index 0000000..35b54eb
--- /dev/null
+++ b/Runtime/GfxDevice/ShaderConstantCache.h
@@ -0,0 +1,142 @@
+#pragma once
+
+#include "GfxDeviceTypes.h"
+#include "Runtime/Math/Vector4.h"
+//#include "Runtime/Utilities/fixed_bitset.h"
+#include "D3D9Utils.h"
+
+
+template<int SIZE>
+class ShaderConstantCache2 {
+public:
+	ShaderConstantCache2() { memset(m_Values, 0, sizeof(m_Values)); Invalidate(); }
+
+	void SetValues( int index, const float* values, int count )
+	{
+		DebugAssert( index >= 0 && count > 0 && (index + count) <= SIZE );
+		float* dest = m_Values[index].GetPtr();
+		UInt8 andedFlags = m_Flags[index];
+		for (int i = 1; i < count; i++)
+			andedFlags &= m_Flags[index + i];
+		// Not worth filtering values bigger than one register
+		if (andedFlags == kValid && count == 1)
+		{
+			// We have a valid value which is not dirty
+			UInt32* destInt32 = reinterpret_cast<UInt32*>(dest);
+			int sizeInt32 = count * sizeof(Vector4f) / sizeof(UInt32);
+			if (CompareArrays(destInt32, reinterpret_cast<const UInt32*>(values), sizeInt32))
+				return;
+		}
+		memcpy(dest, values, count * sizeof(Vector4f));
+		// If all values are marked as dirty we are done
+		if (andedFlags & kDirty)
+			return;
+		// Update flags
+		for (int i = 0; i < count; i++)
+			m_Flags[index + i] = kValid | kDirty;
+		// Add dirty range or append to last range
+		if (!m_DirtyRanges.empty() && m_DirtyRanges.back().second == index)
+			m_DirtyRanges.back().second += count;
+		else
+			m_DirtyRanges.push_back(Range(index, index + count));
+	}
+
+	void Invalidate()
+	{
+		memset(m_Flags, 0, sizeof(m_Flags));
+	}
+
+	void CommitVertexConstants()
+	{
+		IDirect3DDevice9* dev = GetD3DDevice();
+		int numRanges = m_DirtyRanges.size();
+		for (int i = 0; i < numRanges; i++)
+		{
+			const Range& range = m_DirtyRanges[i];
+			int size = range.second - range.first;
+			D3D9_CALL(dev->SetVertexShaderConstantF( range.first, m_Values[range.first].GetPtr(), size ));
+			// Update flags
+			for (int i = 0; i < size; i++)
+				m_Flags[range.first + i] = kValid;
+		}
+		m_DirtyRanges.clear();
+	}
+
+	void CommitPixelConstants()
+	{
+		IDirect3DDevice9* dev = GetD3DDevice();
+		int numRanges = m_DirtyRanges.size();
+		for (int i = 0; i < numRanges; i++)
+		{
+			const Range& range = m_DirtyRanges[i];
+			int size = range.second - range.first;
+			D3D9_CALL(dev->SetPixelShaderConstantF( range.first, m_Values[range.first].GetPtr(), size ));
+			// Update flags
+			for (int i = 0; i < size; i++)
+				m_Flags[range.first + i] = kValid;
+		}
+		m_DirtyRanges.clear();
+	}
+
+private:
+	enum
+	{
+		kValid = 1 << 0,
+		kDirty = 1 << 1
+	};
+	UInt8 m_Flags[SIZE];
+	Vector4f m_Values[SIZE];
+	typedef std::pair<int,int> Range;
+	std::vector<Range>	m_DirtyRanges;
+};
+
+
+template<int SIZE>
+class ShaderConstantCache {
+public:
+	ShaderConstantCache() { Invalidate(); }
+
+	bool CheckCache( int index, const float value[4] )
+	{
+		DebugAssertIf( index < 0 );
+		if( index >= SIZE )
+			return false;
+
+		if( m_Values[index] == value )
+			return true;
+
+		m_Values[index].Set( value );
+		return false;
+	}
+
+	bool CheckCache( int index, const float* values, int count )
+	{
+		DebugAssertIf( index < 0 );
+
+		// Checking whole range for validity seems to be overkill from profiling (just slows it down a bit)
+		// So just invalidate those cache entries.
+
+		if( index + count > SIZE )
+			count = SIZE-index;
+
+		for( int i = 0; i < count; ++i )
+		{
+			m_Values[index+i].x = -std::numeric_limits<float>::infinity();
+		}
+		return false;
+	}
+
+	void Invalidate()
+	{
+		for (int i = 0; i < SIZE; ++i)
+			m_Values[i].x = -std::numeric_limits<float>::infinity();
+	}
+
+private:
+	Vector4f	m_Values[SIZE];
+};
+
+
+typedef ShaderConstantCache2<256> VertexShaderConstantCache;
+typedef ShaderConstantCache2<256> PixelShaderConstantCache;
+