#version 420 core
layout (location = 0) in vec3 vertices;
layout (location = 1) in vec4 uv;
layout (location = 2) in vec2 vertex_offset;
layout (location = 3) in vec4 color;
layout (location = 4) in mat4 model;

out vec3 v_vertices;
out vec2 v_uv;
out vec3 v_world_pos;
// out vec3 v_normal;
out vec4 v_color;
out vec2 v_local_uv;

uniform mat4 projection;

void main()
{

    vec3 temp_vertices = vec3(vertices.xy + vertex_offset, vertices.z);

    vec4 temp = projection * model * vec4(temp_vertices, 1);
    // vec4 temp = projection * model * vec4(temp_vertices, 1);
    gl_Position = temp;


    v_vertices = temp_vertices;
    v_world_pos = (model * vec4(temp_vertices, 1)).xyz;
    // v_normal = normal;
    v_color = color;

    vec2 uv_min = uv.xy;
    vec2 uv_max = uv.zw;

    vec2 uvs[6];
    uvs[0] = uv_min;
    uvs[1] = vec2(uv_max.x, uv_min.y);
    uvs[2] = vec2(uv_max.x, uv_max.y);
    uvs[3] = uv_min;
    uvs[4] = vec2(uv_max.x, uv_max.y);
    uvs[5] = vec2(uv_min.x, uv_max.y);

    v_uv = uvs[gl_VertexID % 6];

    vec2 local_uvs[6];
    local_uvs[0] = vec2(0, 0);
    local_uvs[1] = vec2(1, 0);
    local_uvs[2] = vec2(1, 1);
    local_uvs[3] = vec2(0, 0);
    local_uvs[4] = vec2(1, 1);
    local_uvs[5] = vec2(0, 1);
    v_local_uv = local_uvs[gl_VertexID % 6];
}