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