| 1 | // final pixel output: |
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| 2 | // data from pixel shader to frame buffer |
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| 3 | struct vertexOut { |
1 | struct vertexOut { |
| 4 | float4 HPosition : POSITION; |
2 | float4 HPosition : POSITION; |
| 5 | float4 TexCoord : TEXCOORD0; |
3 | float4 TexCoord : TEXCOORD0; |
| 6 | float3 LightVec : TEXCOORD1; |
4 | float3 LightVec : TEXCOORD1; |
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5 | float3 EyeVec : TEXCOORD2; |
| 7 | float3 WorldNormal : TEXCOORD2; |
6 | float3 WorldNormal : TEXCOORD3; |
| 8 | float3 WorldPos : TEXCOORD3; |
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| 9 | float3 WorldView : TEXCOORD4; |
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| 10 | }; |
7 | }; |
| 11 | |
8 | |
| 12 | struct pixelOut { |
9 | struct pixelOut { |
| 13 | float4 col : COLOR; |
10 | float4 col : COLOR; |
| 14 | }; |
11 | }; |
| 15 | // pixel shader |
12 | |
| 16 | pixelOut main(vertexOut IN, // input from vertex shade |
13 | pixelOut main(vertexOut IN) |
| 17 | uniform float SpecExpon, // constant parameters fro |
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| 18 | uniform float4 AmbiColor, // application |
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| 19 | uniform float4 SurfColor, |
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| 20 | uniform float4 LightColor |
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| 21 | ) |
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| 22 | { |
14 | { |
| 23 | pixelOut OUT; // output of the pixel shader |
15 | pixelOut OUT; // output of the pixel shader |
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16 | |
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17 | float SpecExpon = 120; |
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18 | float4 LightColor = { 1, 1, 1, 1 }; |
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19 | |
| 24 | float3 Ln = normalize(IN.LightVec); |
20 | float3 Ln = IN.LightVec; |
| 25 | float3 Nn = normalize(IN.WorldNormal); |
21 | float3 Nn = IN.WorldNormal; |
| 26 | float3 Vn = normalize(IN.WorldView); |
22 | float3 Vn = IN.EyeVec; |
| 27 | float3 Hn = normalize(Vn + |
23 | |
| 28 | // scalar product between light and normal vectors: |
24 | float3 Hn = 0.5 * (Ln + Vn); |
| 29 | float ldn = dot(Ln,Nn); |
25 | float ldn = dot (Ln, Nn); |
| 30 | // scalar product between halfway and normal vectors: |
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| 31 | float hdn = dot(Hn,Nn); |
26 | float hdn = dot (Hn, Nn); |
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27 | |
| 32 | // specialized "lit" function computes weights for |
28 | // specialized "lit" function computes weights for |
| 33 | // diffuse and specular parts: |
29 | // diffuse and specular parts: |
| 34 | float4 litV = lit(ldn,hdn,SpecExpon); |
30 | float4 litV = lit (ldn, hdn, SpecExpon); |
| 35 | float4 diffContrib = |
31 | float4 diffContrib = glstate.material.diffuse * (litV.y * LightColor + glstate.lightmodel.ambient); |
| 36 | SurfColor * ( litV.y * LightColor + AmbiColor); |
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| 37 | float4 specContrib = litV.y*litV.z * LightColor; |
32 | float4 specContrib = litV.y * litV.z * LightColor; |
| 38 | // sum of diffuse and specular contributions: |
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| 39 | float4 result = diffContrib + specContrib; |
33 | float4 result = diffContrib + specContrib; |
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34 | |
| 40 | OUT.col = result; |
35 | OUT.col = result; |
| 41 | return OUT; // output of pixel shader |
36 | return OUT; |
| 42 | } |
37 | } |
| 43 | |
38 | |
