#version 460 core
#extension GL_ARB_bindless_texture : require

#define INSTANCE_COUNT 65536

layout(location = 0) in vec2 a_position;
layout(location = 1) in vec2 a_uv;

out Varying
{
    vec2 Position;
    vec2 UV;
    flat sampler2D TextureID;
} VS_OUT;

layout(std140, binding = 0) uniform InstanceData
{
    mat4 Transforms[INSTANCE_COUNT];
    sampler2D TextureIDs[INSTANCE_COUNT];
} u_instanceData;

void main()
{
    vec4 pos = u_instanceData.Transforms[gl_InstanceID] * vec4(a_position, 0.0, 1.0);

    VS_OUT.Position = pos.xy;
    VS_OUT.UV = a_uv;
    VS_OUT.TextureID = u_instanceData.TextureIDs[gl_InstanceID];

    gl_Position = pos;
}