// HMS MediaEngine – Beispielplugin: Passthrough mit Live-Parameter "mix"
// PLAN.md §14.4 (Standard-Shaderinputs), §36 Nr. 6
// D3D11-Pixelshader (PS_5_0); Bindung übernimmt der Backend-Adapter (ADR-0004 offen).
// Projekte referenzieren niemals konkrete Backend-Variablennamen (§12.6).

Texture2D    u_input_texture : register(t0);
SamplerState u_sampler       : register(s0);

cbuffer hms_params : register(b0)
{
    float4 u_resolution;     // xy = Auflösung in Pixeln
    float  u_time_seconds;
    float  u_delta_seconds;
    float  u_frame_index;
    float  u_layer_opacity;
    float  u_audio_rms;
    float  u_audio_peak;
    float  u_audio_bass;
    float  u_audio_mid;
    float  u_audio_treble;
    float  u_audio_beat;
    float  param_mix;         // Plugin-Parameter, live änderbar (0..1)
    float  _pad0;             // 16-Byte-Alignment des cbuffer
};

float4 mainPS(float4 pos : SV_POSITION, float2 uv : TEXCOORD0) : SV_Target
{
    float4 src = u_input_texture.Sample(u_sampler, uv);

    // Live-Parameter: mix blendet zwischen Original und zeitmodulierter Helligkeit
    float pulse = 0.5 + 0.5 * sin(u_time_seconds * 2.0);
    float  m    = saturate(param_mix);
    float3 rgb  = src.rgb * lerp(1.0, pulse, m);
    float  a    = src.a * u_layer_opacity;

    return float4(rgb * u_layer_opacity, a);
}