61 lines
1.7 KiB
GLSL
61 lines
1.7 KiB
GLSL
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// Plasma Generator
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// HMS MediaEngine – Generator (GLES, Raspberry Pi). ES 2.0: texture2D, gl_FragColor, Schleifen mit konstanter Höchstgrenze.
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#version 100
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precision mediump float;
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uniform vec2 u_resolution;
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uniform float u_time_seconds;
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uniform float u_delta_seconds;
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uniform float u_frame_index;
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uniform float u_layer_opacity;
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uniform float u_audio_rms;
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uniform float u_audio_peak;
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uniform float u_audio_bass;
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uniform float u_audio_mid;
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uniform float u_audio_treble;
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uniform float u_audio_beat;
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uniform float4 param_color_a;
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uniform float4 param_color_b;
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uniform float param_scale;
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uniform float param_stretch_x;
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uniform float param_stretch_y;
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uniform float param_distance;
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uniform float param_phase;
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uniform float param_speed;
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uniform float param_seed;
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uniform float u_quality_samples;
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varying vec2 v_uv;
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float hash21(vec2 p)
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{
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p = fract(p * vec2(123.34, 456.21));
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p += dot(p, p + 45.32);
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return fract(p.x * p.y);
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}
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void main()
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{
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vec2 p = (v_uv - 0.5) * param_scale;
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p.x *= param_stretch_x;
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p.y *= param_stretch_y;
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float t = u_time_seconds * param_speed + param_phase;
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float terms = clamp(u_quality_samples, 1.0, 8.0);
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float v = 0.0;
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for (int i = 0; i < 8; i++)
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{
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if (float(i) >= terms) { break; }
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float fi = float(i + 1);
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v += sin(p.x * fi + t * fi * 0.5 + param_seed)
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* sin(p.y * fi * 1.3 - t * fi * 0.3 + param_seed * 2.0);
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v += sin(length(p) * fi * 0.7 + t * 0.8 + param_seed);
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}
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v /= terms;
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v = v * 0.5 + 0.5;
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float d = length(p) * param_distance;
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v += 0.5 + 0.5 * sin(d * 3.0 - t * 1.5 + param_seed);
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v = clamp(v, 0.0, 1.0);
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vec3 col = mix(param_color_a.rgb, param_color_b.rgb, v);
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gl_FragColor = vec4(col * u_layer_opacity, u_layer_opacity);
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}
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