一个比较不错Shader~~

来自http://brooknovak.wordpress.com/2008/11/13/hlsl-per-pixel-point-light-using-phong-blinn-lighting-model/

 

float4x4 World;float4x4 View;float4x4 Projection;texture DiffuseTexture;float3 CameraPos;float3 LightPosition;float3 LightDiffuseColor; // intensity multiplierfloat3 LightSpecularColor; // intensity multiplierfloat LightDistanceSquared;float3 DiffuseColor;float3 AmbientLightColor;float3 EmissiveColor;float3 SpecularColor;float SpecularPower;sampler texsampler = sampler_state{ Texture = <DiffuseTexture>;};struct VertexShaderInput{ float4 Position : POSITION0; float3 Normal : NORMAL0; float2 TexCoords : TEXCOORD0;};struct VertexShaderOutput{ float4 Position : POSITION0; float2 TexCoords : TEXCOORD0; float3 Normal : TEXCOORD1; float3 WorldPos : TEXCOORD2;};VertexShaderOutput VertexShaderFunction(VertexShaderInput input){ VertexShaderOutput output; // "Multiplication will be done in the pre-shader - so no cost per vertex" float4x4 viewprojection = mul(View, Projection); float4 posWorld = mul(input.Position, World); output.Position = mul(posWorld, viewprojection); output.TexCoords = input.TexCoords; // Passing information on to do both specular AND diffuse calculation in pixel shader output.Normal = mul(input.Normal, (float3x3)World); output.WorldPos = posWorld; return output;}float4 PixelShaderFunctionWithoutTex(VertexShaderOutput input) : COLOR0{ // Phong relfection is ambient + light-diffuse + spec highlights. // I = Ia*ka*Oda + fatt*Ip[kd*Od(N.L) + ks(R.V)^n] // Ref: http://www.whisqu.se/per/docs/graphics8.htm // and http://en.wikipedia.org/wiki/Phong_shading // Get light direction for this fragment float3 lightDir = normalize(input.WorldPos - LightPosition); // Note: Non-uniform scaling not supported float diffuseLighting = saturate(dot(input.Normal, -lightDir)); // per pixel diffuse lighting // Introduce fall-off of light intensity diffuseLighting *= (LightDistanceSquared / dot(LightPosition - input.WorldPos, LightPosition - input.WorldPos)); // Using Blinn half angle modification for perofrmance over correctness float3 h = normalize(normalize(CameraPos - input.WorldPos) - lightDir); float specLighting = pow(saturate(dot(h, input.Normal)), SpecularPower); return float4(saturate( AmbientLightColor + (DiffuseColor * LightDiffuseColor * diffuseLighting * 0.6) + // Use light diffuse vector as intensity multiplier (SpecularColor * LightSpecularColor * specLighting * 0.5) // Use light specular vector as intensity multiplier ), 1);}float4 PixelShaderFunctionWithTex(VertexShaderOutput input) : COLOR0{ // Phong relfection is ambient + light-diffuse + spec highlights. // I = Ia*ka*Oda + fatt*Ip[kd*Od(N.L) + ks(R.V)^n] // Ref: http://www.whisqu.se/per/docs/graphics8.htm // and http://en.wikipedia.org/wiki/Phong_shading // Get light direction for this fragment float3 lightDir = normalize(input.WorldPos - LightPosition); // per pixel diffuse lighting // Note: Non-uniform scaling not supported float diffuseLighting = saturate(dot(input.Normal, -lightDir)); // Introduce fall-off of light intensity diffuseLighting *= (LightDistanceSquared / dot(LightPosition - input.WorldPos, LightPosition - input.WorldPos)); // Using Blinn half angle modification for perofrmance over correctness float3 h = normalize(normalize(CameraPos - input.WorldPos) - lightDir); float specLighting = pow(saturate(dot(h, input.Normal)), SpecularPower); float4 texel = tex2D(texsampler, input.TexCoords); return float4(saturate( AmbientLightColor + (texel.xyz * DiffuseColor * LightDiffuseColor * diffuseLighting * 0.6) + // Use light diffuse vector as intensity multiplier (SpecularColor * LightSpecularColor * specLighting * 0.5) // Use light specular vector as intensity multiplier ), texel.w); }technique TechniqueWithoutTexture{ pass Pass1 { VertexShader = compile vs_2_0 VertexShaderFunction(); PixelShader = compile ps_2_0 PixelShaderFunctionWithoutTex(); }}technique TechniqueWithTexture{ pass Pass1 { VertexShader = compile vs_2_0 VertexShaderFunction(); PixelShader = compile ps_2_0 PixelShaderFunctionWithTex(); }}