fgdata/Shaders/ubershader.vert

// -*- mode: C; -*-
// UBERSHADER - vertex shader
// Licence: GPL v2
// © Emilian Huminiuc and Vivian Meazza 2011
#version 120

varying vec4	diffuseColor;
varying	vec3	VBinormal;
varying	vec3	VNormal;
varying	vec3	VTangent;
varying	vec3	rawpos;
varying vec3 	eyeVec;
varying vec3	eyeDir;

attribute	vec3	tangent;
attribute	vec3	binormal;

uniform int  		nmap_enabled;
uniform int			rembrandt_enabled;

void	main(void)
{
		rawpos = gl_Vertex.xyz;
		vec4 ecPosition = gl_ModelViewMatrix * gl_Vertex;
		eyeVec = ecPosition.xyz;
		eyeDir = gl_ModelViewMatrixInverse[3].xyz - gl_Vertex.xyz;

		VNormal = normalize(gl_NormalMatrix * gl_Normal);

		vec3 n = normalize(gl_Normal);

// 		generate "fake" binormals/tangents
		vec3 c1 = cross(n, vec3(0.0,0.0,1.0));
		vec3 c2 = cross(n, vec3(0.0,1.0,0.0));
		vec3 tempTangent = c1;

		if(length(c2)>length(c1)){
			tempTangent = c2;
		}

		vec3 tempBinormal = cross(n, tempTangent);

		if (nmap_enabled > 0){
			tempTangent = tangent;
			tempBinormal  = binormal;
		}

		VTangent = normalize(gl_NormalMatrix * tempTangent);
		VBinormal = normalize(gl_NormalMatrix * tempBinormal);

		diffuseColor = gl_Color;
    // Super hack: if diffuse material alpha is less than 1, assume a
	// transparency animation is at work
		if (gl_FrontMaterial.diffuse.a < 1.0)
			diffuseColor.a = gl_FrontMaterial.diffuse.a;

		if(rembrandt_enabled < 1){
		gl_FrontColor = gl_FrontMaterial.emission + gl_Color
					  * (gl_LightModel.ambient + gl_LightSource[0].ambient);
		} else {
		  gl_FrontColor = gl_Color;
		}
		
		gl_Position = ftransform();
		gl_ClipVertex = ecPosition;
		gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
}