#version 330 core

layout(location = 0) in vec3 aPosition;
layout(location = 1) in vec3 aNormal;
layout(location = 2) in vec2 aTexCoord;
layout(location = 3) in vec2 aLayerUV;

out vec3 FragPos;
out vec3 Normal;
out vec2 TexCoord;
out vec2 LayerUV;

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

void main() {
    vec4 worldPos = uModel * vec4(aPosition, 1.0);
    FragPos = worldPos.xyz;

    // Terrain uses identity model matrix, so normal passes through directly
    Normal = aNormal;

    TexCoord = aTexCoord;
    LayerUV = aLayerUV;

    gl_Position = uProjection * uView * worldPos;
}