@vs vs
in vec3 a_pos;
in vec2 a_tex_coords;
in vec4 a_norm;
in vec4 a_weight;
in vec4 a_joint;

out vec2 tex_coords;
out vec3 normal;

uniform vs_p { uniform mat4 vp; };
uniform vmodel { uniform mat4 model; };

uniform skinv { uniform mat4 bones[50]; };

void main() {
  mat4 skin = bones[int(a_joint.x)] * a_weight.x;
  skin += bones[int(a_joint.y)] * a_weight.y;
  skin += bones[int(a_joint.z)] * a_weight.z;
  skin += bones[int(a_joint.w)] * a_weight.w;
  mat4 skinm = model * skin;
  gl_Position = vp * skinm * vec4(a_pos,1.0);
  tex_coords = a_tex_coords;
  normal = (skinm * vec4(a_norm.xyz*2-1,0)).xyz;
}
@end

@fs fs
in vec2 tex_coords;
in vec3 normal;
out vec4 color;

uniform texture2D diffuse;
uniform sampler smp;

uniform lightf {
  vec4 ambient;
};

void main() {
  vec3 lightDir = normalize(vec3(0.5f, 0.5f, 1.0f));
  float diff = max(dot(normal, lightDir), 0.0f);
  color = texture(sampler2D(diffuse,smp),tex_coords) * ambient;
}
@end

@program unlit vs fs