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const float RAIL_HEIGHT = 250;
const vec3[] profile = vec3[]( //
vec3(-1900.F, 0.F, 0.F), //
vec3(-608.F, 0.F, RAIL_HEIGHT), //
vec3(0, 0.F, RAIL_HEIGHT * .7F), //
vec3(608.F, 0.F, RAIL_HEIGHT), //
vec3(1900.F, 0.F, 0.F));
const float[profile.length()] texturePos = float[](0, 0.34, 0.5, 0.65, 1);
uniform mat4 viewProjection;
uniform ivec3 viewPoint;
uniform float clipDistance = 5000000;
uniform float flatDistance = 1000000;
out vec2 texCoord;
out vec3 rposition;
void
doVertex(const ivec3 end, const int v, const float texY, const mat2 rot)
{
rposition = vec3(rot * profile[v].xy, profile[v].z);
ivec3 vpos = end + ivec3(rposition);
gl_Position = viewProjection * vec4(vpos - viewPoint, 1);
texCoord = vec2(texturePos[v], texY);
EmitVertex();
}
void
doSeg(const float dist, const ivec3 apos, const ivec3 bpos, const float atexY, const float btexY, const mat2 arot,
const mat2 brot)
{
if (dist < clipDistance) {
int vstep = (dist < flatDistance) ? 1 : profile.length() - 1;
for (int v = 0; v < profile.length(); v += vstep) {
doVertex(bpos, v, btexY, brot);
doVertex(apos, v, atexY, arot);
}
EndPrimitive();
}
}
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