35 lines
No EOL
1 KiB
GLSL
35 lines
No EOL
1 KiB
GLSL
// Copyright (c) 2008 the OpenTK Team. See license.txt for legal bla
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// custom vertex attribute
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attribute vec3 AttributeTangent;
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// world uniforms
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uniform vec3 Light_Position;
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uniform vec3 Camera_Position;
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// MUST be written to for FS
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varying vec3 VaryingLightVector;
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varying vec3 VaryingEyeVector;
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void main()
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{
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gl_Position = ftransform();
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gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
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vec3 nor = normalize( gl_NormalMatrix * gl_Normal );
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vec3 tan = normalize( gl_NormalMatrix * AttributeTangent );
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vec3 bi = cross(nor, tan);
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// need positions in tangent space
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vec3 vertex = vec3( gl_ModelViewMatrix * gl_Vertex );
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vec3 temp = Light_Position - vertex;
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VaryingLightVector.x = dot(temp, tan); // optimization, calculate dot products rather than building TBN matrix
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VaryingLightVector.y = dot(temp, bi);
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VaryingLightVector.z = dot(temp, nor);
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temp = Camera_Position - vertex;
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VaryingEyeVector.x = dot(temp, tan);
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VaryingEyeVector.y = dot(temp, bi);
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VaryingEyeVector.z = dot(temp, nor);
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} |