#version 430 core
layout(location = 0) in vec3 aPos;
layout(location = 1) in vec3 aNormal;
layout(location = 2) in vec2 aTex;

uniform mat4 uModel;
uniform mat4 uView;
uniform mat4 uProjection;

out vec2 vTex;
out vec3 vWorldNormal;
out vec3 vWorldPos;

void main() {
    vTex = aTex;
    // Transform the mesh normal into world space. For uniform-scale transforms
    // (the common case), the upper-left 3x3 of uModel is correct. Non-uniform
    // scale would require the inverse transpose; we accept that as a Phase 3+
    // concern.
    vWorldNormal = normalize(mat3(uModel) * aNormal);
    vec4 world = uModel * vec4(aPos, 1.0);
    vWorldPos = world.xyz;
    gl_Position = uProjection * uView * world;
}