www.pudn.com > ogl_cg_displacement_mapping.zip > ogl_cg_displacement_mapping.cg

struct vertex 
{ 
    float4 position  : POSITION; 
	float3 normal    : NORMAL; 
    float4 color0    : COLOR0; 
	float2 texcoord0 : TEXCOORD0; 
}; 
 
struct fragment 
{ 
	float4 position  : POSITION; 
	float4 color0    : COLOR0; 
	float2 texcoord0 : TEXCOORD0; 
}; 
 
uniform float4x4 modelViewProj : state.matrix.mvp; 
 
fragment main( vertex IN,  
			   uniform sampler2D displacementTexture : TEXUNIT1, 
			   uniform float4 displacementScaler ) 
{ 
	fragment OUT; 
 
	// Perform a texture look-up for the displacement value. 
    float4 displacement = tex2D( displacementTexture, IN.texcoord0 ); 
 
	// Now, use the displacment value to move or displace the current vertex  
	// along the surface normal. We'll also throw in a scaling factor so we'll 
	// have better control over the effect. 
	float4 displacedPosition = float4( IN.normal * (displacement.x * displacementScaler.x), 0.0 ) + IN.position; 
 
	OUT.position = mul( modelViewProj, displacedPosition ); 
	OUT.color0 = IN.color0; 
	OUT.texcoord0 = IN.texcoord0; 
 
	return OUT; 
}