#version 450
#extension GL_ARB_separate_shader_objects : enable

layout(push_constant) uniform PushConstants {
    mat4 model;
} push;

layout(binding = 0) uniform ObjectUniformData {
    mat4 view;
    mat4 projection;
    float time;
    vec3 light_position;
} ubo;

layout(location = 0) in vec3 position;
layout(location = 1) in vec2 uv;
layout(location = 2) in vec3 normal;

layout(location = 0) out vec2 tex_coords;
layout(location = 1) out vec3 normal_cam;
layout(location = 2) out vec3 position_cam;
layout(location = 3) out vec3 light_direction_cam;

out gl_PerVertex {
    vec4 gl_Position;
};

void main() {
    gl_Position = ubo.projection * ubo.view * push.model * vec4(position, 1.0);
    tex_coords = uv;

    position_cam = vec3(ubo.view * push.model * vec4(position, 1.0));
    // TODO: use inverse transpose so this doesn't break when scaling
    normal_cam = vec3(ubo.view * push.model * vec4(normal, 1.0));

    vec3 light_position_cam = vec3(ubo.view * vec4(ubo.light_position, 1.0));
    light_direction_cam = light_position_cam - position_cam;
}