1 files changed, 52 insertions, 0 deletions
diff --git a/Runtime/GfxDevice/ChannelAssigns.h b/Runtime/GfxDevice/ChannelAssigns.h
new file mode 100644
index 0000000..fafb4d5
--- /dev/null
+++ b/Runtime/GfxDevice/ChannelAssigns.h
@@ -0,0 +1,52 @@
+#ifndef __CHANNELASSIGNS_H__
+#define __CHANNELASSIGNS_H__
+
+#include <string>
+#include "GfxDeviceTypes.h"
+
+namespace ShaderLab {
+struct ParserBindChannels;
+}
+
+// Tracks which vertex components should be sourced from which shader channels
+// TODO: It gets serialized a lot for multithreading, can we make it more compact?
+class ChannelAssigns {
+public:
+	ChannelAssigns();
+	void FromParsedChannels (const ShaderLab::ParserBindChannels& parsed); // ShaderParser.cpp
+
+	void Bind( ShaderChannel source, VertexComponent target );
+	void Unbind( VertexComponent target );
+	void MergeWith( const ChannelAssigns& additional );
+
+	UInt32 GetTargetMap() const { return m_TargetMap; }
+	UInt32 GetSourceMap() const { return m_SourceMap; }
+	bool IsEmpty() const { return m_TargetMap == 0; }
+
+	// if and only if all source channels directly map to target components
+	//   src.Vertex -> dst.Vertex, src.Normal -> dst.Normal, etc
+	//   there is NO cross-bar connections like: src.TexCoord0 -> dst.TexCoord1
+	bool IsDirectlyWired() const { return m_DirectlyWired; }
+
+	ShaderChannel GetSourceForTarget( VertexComponent target ) const { return ShaderChannel(m_Channels[target]); }
+
+	bool operator== (const ChannelAssigns& other) const;
+
+private:
+	void RecalculateIsDirectlyWired ();
+
+private:
+	UInt32	m_TargetMap; // bitfield of which vertex components are sourced
+	UInt32	m_SourceMap; // bitfield of which source channels are used
+	SInt8	m_Channels[kVertexCompCount]; // for each vertex component: from which channel it is sourced
+	bool	m_DirectlyWired;
+
+	// Friends for serialization
+	friend struct GfxRet_ChannelAssigns;
+};
+
+
+ShaderChannel GetShaderChannelFromName( const std::string& name );
+
+
+#endif