#version 300 es
precision highp float;
uniform mediump sampler2D u_tex;
in vec2 vTexCoord;
in vec4 vColor;
out vec4 fragColor;
void main() {
    // textured additive: the sprite's RGB and coverage both scale the added light.
    // shared by billboard.vert (particles) and ribbon_trail.vert (trails)
    vec4 tex = texture(u_tex, vTexCoord);
    fragColor = vec4(tex.rgb * tex.a * vColor.rgb, vColor.a);
}