// Load And Compile The Vertex Shader From File
cgWaterSurface = cgCreateProgramFromFile(cgContext, CG_SOURCE,"Wave.Cg", cgVertexProfile, "main", 0);

// Validate Success
if (cgWaterSurface == NULL)
{
	// We Need To Determine What Went Wrong
	CGerror Error = cgGetError();

	// Show A Message Box Explaining What Went Wrong
MessageBox(NULL, cgGetErrorString(Error), "Error", MB_OK);
....
...
..

// Water Wave Cg Program

// Input structure
struct appdata 
{
	float4 position : POSITION;			// Position is always required
	float4 color: COLOR0;
	float3 wave: COLOR1;
};

// Output structure
struct vfconn
{
	float4 HPos: POSITION;
	float4 Col0: COLOR0;
};

// Our actual CG script
vfconn main(appdata IN,uniform float4x4 ModelViewProj)
{
	vfconn OUT;				// Variable To Handle Our Output From The Vertex
							// Shader (Goes To A Fragment Shader If Available)
							
	// Change The Y Position Of The Vertex Based On Sine Waves
	IN.position.y = ( sin(IN.wave.x + (IN.position.z / 4.0) ) + sin(IN.wave.x + (IN.position.x / 5.0) ) ) * 2.5f;							
	
	// Transform The Vertex Position Into Homogenous Clip-Space (Required)
	OUT.HPos = mul(ModelViewProj, IN.position);

	// Set The Color To The Value Specified In IN.color
	OUT.Col0.xyz = IN.color.xyz;
	
	return OUT;
};