atmosphere_vs.glsl

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/**
 * @file
 * @brief Atmosphere vertex shader
 */
 
out_qualifier vec2 tex;
 
out_qualifier vec4 ambientLight;
out_qualifier vec4 diffuseLight;
out_qualifier vec4 specularLight;
 
out_qualifier vec3 lightVec;
out_qualifier vec3 eyeVec;
 
uniform vec2 UVSCALE;
 
void main() {
    gl_Position = ftransform();
 
    tex = gl_MultiTexCoord0.xy * UVSCALE;
 
    vec4 lightPos = gl_LightSource[0].position;
    ambientLight = gl_LightSource[0].ambient;
    diffuseLight = gl_LightSource[0].diffuse;
    specularLight = gl_LightSource[0].specular;
 
    vec3 t, b, n;
    n = normalize(gl_NormalMatrix * gl_Normal);
    t = normalize(cross(n, vec3(1.0, 0.0, 0.0)));
    b = normalize(cross(t, n));
 
    lightVec.x = dot(lightPos.rgb, t);
    lightVec.y = dot(lightPos.rgb, b);
    lightVec.z = dot(lightPos.rgb, n);
 
    /* estimate view vector (orthographic projection means we don't really have one) */
    vec4 view = vec4(0.0, 0.0, 100.0, 1.0);
    eyeVec.x = dot(view.xyz, t);
    eyeVec.y = dot(view.xyz, b);
    eyeVec.z = dot(view.xyz, n);
}