#version 100
// HMS MediaEngine – Beispielplugin: Passthrough (OpenGL ES, Raspberry Pi Pfad)
// Semantisch identisch zu HLSL/GLSL-Varianten (§36 Nr. 6, §12.6).
precision mediump float;

uniform sampler2D u_input_texture;
uniform vec2  u_resolution;
uniform float u_time_seconds;
uniform float u_delta_seconds;
uniform float u_frame_index;
uniform float u_layer_opacity;
uniform float u_audio_rms;
uniform float u_audio_peak;
uniform float u_audio_bass;
uniform float u_audio_mid;
uniform float u_audio_treble;
uniform float u_audio_beat;
uniform float param_mix;

varying vec2 v_uv;

void main()
{
    vec4 src = texture2D(u_input_texture, v_uv);

    float pulse = 0.5 + 0.5 * sin(u_time_seconds * 2.0);
    float m     = clamp(param_mix, 0.0, 1.0);
    vec3  rgb   = src.rgb * mix(1.0, pulse, m);
    float a     = src.a * u_layer_opacity;

    gl_FragColor = vec4(rgb * u_layer_opacity, a);
}