layout (location=0) in vec3 a_co;
layout (location=1) in vec3 a_norm;
layout (location=2) in vec2 a_uv;
layout (location=3) in vec4 a_colour;
layout (location=4) in vec4 a_weights;
layout (location=5) in ivec4 a_groups;

uniform mat4 uPv;
uniform mat4x3 uMdl;

out vec3 aNorm;
out vec2 aUv;
out vec3 aCo;

void main()
{
   vec3 world_pos = uMdl * vec4( a_co, 1.0 );
   gl_Position = uPv * vec4(world_pos,1.0);

   aNorm = a_norm;
   aCo = world_pos;
   aUv = a_uv;
}