port from perforce

evoke-64k/trunk/ev10/TerrainGrid.h

@@ -0,0 +1,51 @@
+#pragma once
+
+#include <d3dx9.h>
+
+extern IDirect3DDevice9* g_d3d_device;
+
+class TerrainGrid
+{
+public:
+	typedef float (TerrainGrid::*iso_surface_function)(const D3DXVECTOR3&);
+
+	void Init( int StepsXZ, int StepsY, iso_surface_function pIsoSurface );
+	void Render();
+
+	float IsoSurfaceIsle(const D3DXVECTOR3& pos);
+	float IsoSurfaceCave(const D3DXVECTOR3& pos);
+	float IsoSurfaceCaveGround(const D3DXVECTOR3& pos);
+
+private:
+
+	typedef struct
+	{
+	   D3DXVECTOR3 p[3];
+	} TRIANGLE;
+
+	typedef struct
+	{
+	   D3DXVECTOR3 p[8];
+	   float val[8];
+	} GRIDCELL;
+
+	float PerlinNoise_2D(float x, float y, float scale);
+	D3DXVECTOR3 VertexInterp(float isolevel, D3DXVECTOR3 p1, D3DXVECTOR3 p2, float valp1, float valp2);
+	int Polygonise(GRIDCELL grid, float isolevel, TRIANGLE* triangles);
+	D3DXVECTOR3 GetNormal(D3DXVECTOR3 input, iso_surface_function pIsoSurface);
+	
+	D3DLOCKED_BOX noiseLock;
+	int vertexCount;
+	int indexCount;
+	IDirect3DVertexDeclaration9* vertexDecl;
+	IDirect3DIndexBuffer9* indexBuffer;
+	IDirect3DVertexBuffer9* vertexBuffer;
+};
+
+struct TerrainVertex
+{
+	D3DXVECTOR3 pos;
+	D3DXVECTOR3 normal;
+	D3DXVECTOR2 tex;
+	D3DCOLOR col;
+};