游戏引擎

开发平台：

Visual C++

HeightShader.fx：源码内容

							float scale;
float4 trailCorner00, trailCorner10, trailCorner01, trailCorner11;
struct VS_INPUT
{
    float3  Pos     : POSITION;
    float2  tc     : TEXCOORD0;
};
struct VS_OUTPUT
{
	float4  Pos			: POSITION;
	float2  tc0			: TEXCOORD0;	
	float2  tc1			: TEXCOORD1;
	float2  tc2			: TEXCOORD2;	
};
texture noise0;
texture noise1;
texture trailHeight;
sampler noise0Sampler = sampler_state 
{
	texture = <noise0>;
	AddressU  = WRAP;		
	AddressV  = WRAP;
	MIPFILTER = LINEAR;
	MINFILTER = LINEAR;
	MAGFILTER = LINEAR;
};
sampler noise1Sampler = sampler_state 
{
	texture = <noise1>;
	AddressU  = WRAP;		
	AddressV  = WRAP;
	MIPFILTER = LINEAR;
	MINFILTER = LINEAR;
	MAGFILTER = LINEAR;
};
sampler trailSampler = sampler_state 
{
	texture = <trailHeight>;
	AddressU  = WRAP;		
	AddressV  = WRAP;
	MIPFILTER = LINEAR;
	MINFILTER = LINEAR;
	MAGFILTER = LINEAR;
};
VS_OUTPUT VShader(VS_INPUT i)
{
	VS_OUTPUT o;
	o.Pos = float4( i.tc.x*2-1,1-i.tc.y*2, 0, 1 );
	o.tc0 = scale*i.Pos.xz*0.01;
	o.tc1 = scale*i.Pos.xz*0.1;
	o.tc2 = i.Pos.xz;
	return o;
}
float4 PShader(VS_OUTPUT i) : COLOR
{	
	float2 trail_tc;
	float a = 0.0f;
	if(i.tc2.x>trailCorner00.x && i.tc2.y>trailCorner00.z && i.tc2.x<trailCorner11.x && i.tc2.y<trailCorner11.z)
	{
		trail_tc = (i.tc2 - trailCorner00.xz)/(trailCorner11.xz - trailCorner00.xz);
		a = 1.0f;
		
	}
	//return ((tex2D(noise0Sampler, i.tc0) + tex2D(noise1Sampler, i.tc1)) - 0.5f) * (1.0f-a);//*tex2D(trailSampler, trail_tc)
	return	a*(tex2D(trailSampler, trail_tc.yx)-0.5f)*0.4 + ((tex2D(noise0Sampler, i.tc0) + tex2D(noise1Sampler, i.tc1)) - 0.5f);
}
technique T0
{
	pass P0
	{
		vertexshader = compile vs_2_0 VShader();
		pixelshader = compile ps_2_0 PShader();  
	}
}

						