voxel.vert

//generated via stb_voxel_render.h stbvox_get_vertex_shader() using the following #defines:
//
//#define STBVOX_CONFIG_MODE 0
//#define STBVOX_CONFIG_DISABLE_TEX2
//
#version 150
in uvec4 attr_face;
in uint attr_vertex;
uniform vec3 transform[3];
uniform vec4 camera_pos;
uniform vec3 normal_table[32];
uniform mat4x4 model_view;
flat out uvec4  facedata;
     out  vec3  voxelspace_pos;
     out  vec3  vnormal;
     out float  texlerp;
     out float  amb_occ;
void main()
{
   facedata = attr_face;
   vec3 offset;
   offset.x = float( (attr_vertex       ) & 127u );
   offset.y = float( (attr_vertex >>  7u) & 127u );
   offset.z = float( (attr_vertex >> 14u) & 511u );
   amb_occ  = float( (attr_vertex >> 23u) &  63u ) / 63.0;
   texlerp  = float( (attr_vertex >> 29u)        ) /  7.0;
   vnormal = normal_table[(facedata.w>>2u) & 31u];
   voxelspace_pos = offset * transform[0];
   vec3 position  = voxelspace_pos + transform[1];
   gl_Position = model_view * vec4(position,1.0);
}