#version 450 core
layout (location = 0) in vec3 aPos;
layout (location = 1) in vec2 aOffset; // Смещение углов квадрата
layout (location = 2) in float aLife;

uniform mat4 uProjection;
uniform mat4 uView;

out float vLife;

void main() {
    vLife = aLife;
    vec4 viewPos = uView * vec4(aPos, 1.0);
    // Billboard: квадрат всегда смотрит на камеру
    viewPos.xy += aOffset * aLife * 0.5;
    gl_Position = uProjection * viewPos;
}