#version 450

layout(location = 0) in vec3 in_position;
layout(location = 1) in vec3 in_color;

layout(location = 0) out vec3 frag_color;

layout(push_constant) uniform PushConstants {
    mat4 mvp;
    vec4 chunk_offset;
} push_constants;

void main() {
    // The chunk-local vertex is shifted into world space by the per-chunk offset before projection.
    vec3 world_position = in_position + push_constants.chunk_offset.xyz;
    gl_Position = push_constants.mvp * vec4(world_position, 1.0);

    frag_color = in_color;
}