oolite/Resources/Shaders/oolite-default-planet.vertex

// No vNormal, because normal is always 0,0,1 in tangent space.
varying vec3			vEyeVector;
varying vec2			vTexCoords;
varying vec3			vLight1Vector;
varying vec3			vCoords;


void main(void)
{
	vCoords = gl_Vertex.xyz;
	
	// Build tangent basis.
	vec3 normal = normalize(gl_NormalMatrix * gl_Normal);
	vec3 binormal = cross(normal, gl_NormalMatrix * vec3(0, 1, 0));
	vec3 tangent = -cross(normal, binormal);
	
	mat3 TBN = mat3(tangent, binormal, normal);
	
	vec3 eyeVector = -vec3(gl_ModelViewMatrix * gl_Vertex);
	vEyeVector = eyeVector * TBN;

	vec3 light1Vector = gl_LightSource[1].position.xyz + eyeVector;
	vLight1Vector = light1Vector * TBN;
	
	vTexCoords = gl_MultiTexCoord0.st;
	gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
}