95 lines
2.8 KiB
HLSL
95 lines
2.8 KiB
HLSL
//-----------------------------------------------------------------------------
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// Lighting.fxh
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//
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// Microsoft XNA Community Game Platform
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// Copyright (C) Microsoft Corporation. All rights reserved.
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//-----------------------------------------------------------------------------
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struct ColorPair
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{
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float3 Diffuse;
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float3 Specular;
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};
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ColorPair ComputeLights(float3 eyeVector, float3 worldNormal, uniform int numLights)
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{
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float3x3 lightDirections = 0;
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float3x3 lightDiffuse = 0;
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float3x3 lightSpecular = 0;
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float3x3 halfVectors = 0;
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[unroll]
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for (int i = 0; i < numLights; i++)
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{
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lightDirections[i] = float3x3(DirLight0Direction, DirLight1Direction, DirLight2Direction) [i];
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lightDiffuse[i] = float3x3(DirLight0DiffuseColor, DirLight1DiffuseColor, DirLight2DiffuseColor) [i];
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lightSpecular[i] = float3x3(DirLight0SpecularColor, DirLight1SpecularColor, DirLight2SpecularColor)[i];
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halfVectors[i] = normalize(eyeVector - lightDirections[i]);
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}
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float3 dotL = mul(-lightDirections, worldNormal);
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float3 dotH = mul(halfVectors, worldNormal);
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float3 zeroL = step(float3(0,0,0), dotL);
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float3 diffuse = zeroL * dotL;
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float3 specular = pow(max(dotH, 0) * zeroL, SpecularPower);
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ColorPair result;
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result.Diffuse = mul(diffuse, lightDiffuse) * DiffuseColor.rgb + EmissiveColor;
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result.Specular = mul(specular, lightSpecular) * SpecularColor;
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return result;
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}
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CommonVSOutput ComputeCommonVSOutputWithLighting(float4 position, float3 normal, uniform int numLights)
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{
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CommonVSOutput vout;
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float4 pos_ws = mul(position, World);
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float3 eyeVector = normalize(EyePosition - pos_ws.xyz);
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float3 worldNormal = normalize(mul(normal, WorldInverseTranspose));
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ColorPair lightResult = ComputeLights(eyeVector, worldNormal, numLights);
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vout.Pos_ps = mul(position, WorldViewProj);
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vout.Diffuse = float4(lightResult.Diffuse, DiffuseColor.a);
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vout.Specular = lightResult.Specular;
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vout.FogFactor = ComputeFogFactor(position);
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return vout;
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}
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struct CommonVSOutputPixelLighting
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{
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float4 Pos_ps;
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float3 Pos_ws;
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float3 Normal_ws;
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float FogFactor;
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};
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CommonVSOutputPixelLighting ComputeCommonVSOutputPixelLighting(float4 position, float3 normal)
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{
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CommonVSOutputPixelLighting vout;
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vout.Pos_ps = mul(position, WorldViewProj);
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vout.Pos_ws = mul(position, World).xyz;
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vout.Normal_ws = normalize(mul(normal, WorldInverseTranspose));
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vout.FogFactor = ComputeFogFactor(position);
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return vout;
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}
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#define SetCommonVSOutputParamsPixelLighting \
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vout.PositionPS = cout.Pos_ps; \
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vout.PositionWS = float4(cout.Pos_ws, cout.FogFactor); \
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vout.NormalWS = cout.Normal_ws;
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