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attribute vec3 tangent;
varying vec3 lightVec;
varying vec3 halfVec;
varying vec3 eyeVec;
// -------------------------------------------------------
// Vertex shader's main entry point.
//
// Bump mapping with parallax offset.
// -------------------------------------------------------
void main (void)
{
// output vertex position
gl_Position = ftransform ();
vec3 n = normalize (gl_NormalMatrix * gl_Normal);
vec3 t = normalize (gl_NormalMatrix * tangent);
vec3 b = cross (n, t);
// output texture coordinates for decal and normal maps
gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
// transform light and half angle vectors by tangent basis
vec3 v;
v.x = dot (vec3 (gl_LightSource[0].position), t);
v.y = dot (vec3 (gl_LightSource[0].position), b);
v.z = dot (vec3 (gl_LightSource[0].position), n);
lightVec = normalize (v);
v.x = dot (vec3 (gl_LightSource[0].halfVector), t);
v.y = dot (vec3 (gl_LightSource[0].halfVector), b);
v.z = dot (vec3 (gl_LightSource[0].halfVector), n);
halfVec = normalize (v);
eyeVec = vec3 (gl_ModelViewMatrix * gl_Vertex);
v.x = dot (eyeVec, t);
v.y = dot (eyeVec, b);
v.z = dot (eyeVec, n);
eyeVec = normalize (v);
}
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