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uniform vec4 center;
uniform mat4 xform;
void main(void)
{
gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
gl_Position *= xform;
// Calc texcoord values
vec4 pos = gl_Vertex;
float d = sqrt(pos.x * pos.x + pos.y * pos.y);
float a = atan(pos.x/pos.y) / 3.1415;
if (a < 0.0) a += 1.0;
a *= 2.0;
a -= float(int(a));
pos -= center;
float h = pos.z;
h = abs(2.0 * atan(h/d) / 3.1415);
gl_TexCoord[0].x = a;
gl_TexCoord[0].y = h;
}