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attribute vec2 a_pos;
attribute vec2 a_offset;
attribute vec4 a_data1;
attribute vec4 a_data2;
// matrix is for the vertex position, exmatrix is for rotating and projecting
// the extrusion vector.
uniform mat4 u_matrix;
uniform mat4 u_exmatrix;
uniform float u_zoom;
uniform float u_fadedist;
uniform float u_minfadezoom;
uniform float u_maxfadezoom;
uniform float u_fadezoom;
uniform float u_opacity;
uniform vec2 u_texsize;
varying vec2 v_tex;
varying float v_alpha;
void main() {
vec2 a_tex = a_data1.xy;
float a_labelminzoom = a_data1[2];
float a_angle = a_data1[3];
vec2 a_zoom = a_data2.st;
float a_minzoom = a_zoom[0];
float a_maxzoom = a_zoom[1];
float a_fadedist = 10.0;
// u_zoom is the current zoom level adjusted for the change in font size
float z = 2.0 - step(a_minzoom, u_zoom) - (1.0 - step(a_maxzoom, u_zoom));
// fade out labels
float alpha = clamp((u_fadezoom - a_labelminzoom) / u_fadedist, 0.0, 1.0);
if (u_fadedist >= 0.0) {
v_alpha = alpha;
} else {
v_alpha = 1.0 - alpha;
}
if (u_maxfadezoom < a_labelminzoom) {
v_alpha = 0.0;
}
if (u_minfadezoom >= a_labelminzoom) {
v_alpha = 1.0;
}
// if label has been faded out, clip it
z += step(v_alpha, 0.0);
gl_Position = u_matrix * vec4(a_pos, 0, 1) + u_exmatrix * vec4(a_offset / 64.0, z, 0);
v_tex = a_tex / u_texsize;
v_alpha *= u_opacity;
}
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