70 lines
2.2 KiB
GLSL
70 lines
2.2 KiB
GLSL
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// Starfield Generator
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// HMS MediaEngine – Generator (GLSL, Linux x64). Semantik identisch zu HLSL/GLES (§12.6, §15.1).
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#version 330 core
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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_count;
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uniform float param_size;
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uniform float param_speed;
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uniform float param_direction_x;
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uniform float param_direction_y;
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uniform float param_depth;
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uniform float param_twinkle;
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uniform float param_seed;
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uniform float u_quality_samples;
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in vec2 v_uv;
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out vec4 fragColor;
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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;
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float t = u_time_seconds * param_speed;
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float maxN = clamp(u_quality_samples, 1.0, 512.0);
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float dl = length(vec2(param_direction_x, param_direction_y));
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vec2 dir = dl > 1e-4 ? vec2(param_direction_x, param_direction_y) / dl : vec2(0.0, -1.0);
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float acc = 0.0;
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float colAcc = 0.0;
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for (int i = 0; i < 512; i++)
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{
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if (float(i) >= maxN) { break; }
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vec2 base = vec2(hash21(vec2(float(i) + param_seed, 1.0)), hash21(vec2(float(i) + param_seed, 2.0)));
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float depth = hash21(vec2(float(i) + param_seed, 3.0)) * param_depth;
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vec2 pos = base + dir * t * (0.1 + depth * 0.9);
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pos = fract(pos);
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vec2 d = pos - p;
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d = abs(d);
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d = min(d, 1.0 - d);
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float dist = length(d);
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float s = param_size * (0.3 + depth);
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float star = exp(-dist * dist / max(s * s, 1e-5));
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float tw = 0.5 + 0.5 * sin(t * 3.0 + param_seed * 10.0 + float(i) * 1.7);
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star *= mix(1.0, tw, param_twinkle);
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acc += star;
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colAcc += star * depth;
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}
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acc = clamp(acc, 0.0, 1.0);
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float mixT = maxN > 1.0 ? colAcc / max(acc, 1e-5) : 0.0;
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vec3 col = mix(param_color_a.rgb, param_color_b.rgb, mixT);
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fragColor = vec4(col * acc * u_layer_opacity, acc * u_layer_opacity);
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}
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