fgdata/Shaders/transition.vert

// -*-C++-*-
// -*-C++-*-
// Texture switching based on face slope and snow level
// based on earlier work by Frederic Bouvier, Tim Moore, and Yves Sablonier.
// © Emilian Huminiuc 2011


#version 120

varying float	RawPosZ;
varying vec3	WorldPos;
varying vec4    eyePos;
varying vec3	normal;
varying vec3	Vnormal;

uniform mat4 osg_ViewMatrixInverse;

void setupShadows(vec4 eyeSpacePos);

void main()
    {
    RawPosZ = gl_Vertex.z;
    eyePos = gl_ModelViewMatrix * gl_Vertex;
	WorldPos = (osg_ViewMatrixInverse * eyePos).xyz;
    gl_Position = ftransform();
    gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
    normal = normalize(gl_Normal);
    Vnormal = normalize(gl_NormalMatrix * gl_Normal);
    setupShadows(eyePos);
    }