attribute vec4 a_position;
attribute vec3 a_normal;
attribute vec4 a_color;

uniform mat4 u_proj;
uniform mat4 u_trans;
uniform vec3 u_lightdir;
uniform vec3 u_camdir;
uniform vec3 u_ambientColor;

varying vec4 v_col;

const vec3 diffuse = vec3(0);
const float shinefalloff = 4.0;
const float shinelen = 0.2;

void main(){
	vec3 norc = u_ambientColor * (diffuse + vec3(clamp((dot(a_normal, u_lightdir) + 1.0) / 2.0, 0.0, 1.0)));
    float shinedot = max((-dot(u_camdir, a_normal) - (1.0 - shinelen)) / shinelen, 0.0);
    float shinyness = (1.0 - a_color.a) * pow(shinedot, shinefalloff);
    vec4 baseCol = vec4(a_color.rgb, 1.0);

	v_col = lerp(baseCol * vec4(norc, 1.0), vec4(1.0), shinyness * norc.r);
    gl_Position = u_proj * u_trans * a_position;
}