- added an abstract base vertex buffer class.

src/hwrenderer/data/vertexbuffer.h

@@ -0,0 +1,50 @@
+#pragma once
+
+// The low level code needs to know which attributes exist.
+// OpenGL needs to change the state of all of them per buffer binding.
+// VAOs are mostly useless for this because they lump buffer and binding state together which the model code does not want.
+enum
+{
+	VATTR_VERTEX_BIT,
+	VATTR_TEXCOORD_BIT,
+	VATTR_COLOR_BIT,
+	VATTR_VERTEX2_BIT,
+	VATTR_NORMAL_BIT,
+	VATTR_NORMAL2_BIT,
+	
+	VATTR_MAX
+};
+
+enum EVertexAttributeFormat
+{
+	VFmt_Float4,
+	VFmt_Float3,
+	VFmt_Float2,
+	VFmt_Float,
+	VFmt_Byte4,
+	VFmt_Packed_A2R10G10B10,
+};
+
+struct FVertexBufferAttribute
+{
+	int binding;
+	int location;
+	int format;
+	int offset;
+};
+
+class IVertexBuffer
+{
+protected:
+	size_t buffersize = 0;
+	void *map = nullptr;
+	bool nomap = true;
+public:
+	virtual ~IVertexBuffer() {}
+	virtual void SetData(size_t size, void *data, bool staticdata = true) = 0;
+	virtual void SetFormat(int numBindingPoints, int numAttributes, size_t stride, FVertexBufferAttribute *attrs) = 0;
+	virtual void Map() {}		// Only needed by old OpenGL but this needs to be in the interface.
+	virtual void Unmap() {}
+	void *Memory() { assert(map); return map; }
+};
+