60 lines
1.7 KiB
HLSL
60 lines
1.7 KiB
HLSL
#include "Header.hlsli"
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float3x3 cotangent_frame( float3 N, float3 p, float2 uv )
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{
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// get edge vectors of the pixel triangle
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float3 dp1 = ddx( p );
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float3 dp2 = ddy( p );
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float2 duv1 = ddx( uv );
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float2 duv2 = ddy( uv );
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// solve the linear system
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float3 dp2perp = cross( dp2, N );
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float3 dp1perp = cross( N, dp1 );
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float3 T = dp2perp * duv1.x + dp1perp * duv2.x;
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float3 B = dp2perp * duv1.y + dp1perp * duv2.y;
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// construct a scale-invariant frame
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float invmax = rsqrt( max( dot(T,T), dot(B,B) ) );
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return transpose(float3x3( T * invmax, B * invmax, N ));
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}
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float3 perturb_normal( float3 N, float3 V, float2 texcoord )
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{
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// assume N, the interpolated vertex normal and
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// V, the view vector (vertex to eye)
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float3 map = Normal.Sample(S1,texcoord).xyz;
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map = map * 255./127. - 128./127.;
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#ifdef WITH_NORMALMAP_2CHANNEL
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map.z = sqrt( 1. - dot( map.xy, map.xy ) );
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#endif
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#ifdef WITH_NORMALMAP_GREEN_UP
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map.y = -map.y;
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#endif
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float3x3 TBN = cotangent_frame( N, -V, texcoord );
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return normalize( mul(transpose(TBN), map) );
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}
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PixelOut main(VertexOut input)
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{
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PixelOut output;
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output.DiffuseGlow = Diffuse.Sample(S1, input.UV) * float4(Color, 1);
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//NORMALIZE
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float3x3 CoTangentFrame = cotangent_frame(input.normal, normalize(input.ViewPos), input.UV);
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float3 map = Normal.Sample(S1,input.UV).xyz;
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//map = normalize((map * 2) -1);
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map = map * 255./127. - 128./127.;
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//map = map * 255;
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float3 normal = normalize(mul(CoTangentFrame, map));
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//normal = perturb_normal( normal, normalize(-input.ViewPos), input.UV );
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output.NormalSpec = float4(normal, Normal.Sample(S1, input.UV).w*255);
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//output.NormalSpec = float4(input.normal, Normal.Sample(S1, input.UV).w * 0);
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//output.NormalSpec = float4(map,0);
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return output;
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} |