#version 450

layout(location = 0) in vec3 position;
layout(location = 1) in vec3 normal;
layout(location = 2) in vec2 texcoord;
layout(location = 3) in ivec2 index;

layout(location = 0) out vec4 frag_color;
layout(location = 1) out vec4 frag_mcolor;
layout(location = 2) out vec2 frag_texcoord;
layout(location = 3) out int frag_texindex;
layout(location = 4) out vec3 frag_pos;
layout(location = 5) out vec3 frag_normal;

struct VertexAttribute {
    mat4 matrix;
    mat4 nmatrix;
    vec4 color;
    vec4 mixcolor;
};

layout(binding = 0) uniform GlobalVars {
    mat4 proj_view;
    vec3 light;
    vec3 eye;
} global;

layout (std430, binding = 1) buffer AttributeBlock { 
    VertexAttribute atts[2048];
} units;

void main() {
    gl_Position = global.proj_view * units.atts[index[0]].matrix * vec4(position,1.0);
    frag_color = units.atts[index[0]].color;
    frag_mcolor = units.atts[index[0]].mixcolor;
    frag_texcoord = texcoord;
    frag_texindex = index[1];
    frag_pos = vec3(units.atts[index[0]].matrix * vec4(position,1.0));
    frag_normal = normalize(vec3(units.atts[index[0]].nmatrix * vec4(normal,1.0)));
}