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root |
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// data from application to vertex program |
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struct vertexIn { |
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float3 Position : POSITION; // pre-defined registers |
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float4 UV : TEXCOORD0; |
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float4 Normal : NORMAL; |
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}; |
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// vertex shader to pixel shader |
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struct vertexOut { |
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float4 HPosition : POSITION; |
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float4 TexCoord : TEXCOORD0; |
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float3 LightVec : TEXCOORD1; |
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float3 WorldNormal : TEXCOORD2; |
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float3 WorldPos : TEXCOORD3; |
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float3 WorldView : TEXCOORD4; |
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}; |
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// vertex shader |
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vertexOut mainVS(vertexIn IN, // vertex input from app |
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uniform float4x4 WorldViewProj,// constant parameters |
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uniform float4x4 WorldIT, // from app: various |
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uniform float4x4 World, // transformation |
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uniform float4x4 ViewIT, // matrices and a |
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uniform float3 LightPos // point-light source |
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) |
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{ |
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vertexOut OUT; // output of the vertex shader |
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OUT.WorldNormal = mul(WorldIT, IN.Normal).xyz; |
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// position in object coords: |
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float4 Po = float4(IN.Position.x,IN.Position.y, |
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IN.Position.z,1.0); |
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float3 Pw = mul(World, Po).xyz; // pos in world coord |
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OUT.WorldPos = Pw; // pos in world coords |
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OUT.LightVec = LightPos - Pw; // light vector |
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OUT.TexCoord = IN.UV; // original tex coords |
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// view vector in world coords: |
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OUT.WorldView = normalize(ViewIT[3].xyz - Pw); |
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// pos in clip coords: |
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OUT.HPosition = mul(WorldViewProj, Po); |
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return OUT; // output of vertex shader |
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} |
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