L'électron rare
d8aa727887
Layer E draws two concentric wireframe shells of the sphere with additive blending: an outer blue shell breathing with bass and an inner magenta shell pulsing with kick, spinning opposite ways.
68 lines
2.8 KiB
GLSL
68 lines
2.8 KiB
GLSL
#version 150
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uniform sampler2D spectroTex; // width = time, height = freq, R32F [0,1]
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uniform float scrollOffset;
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uniform int colormapId;
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uniform int renderMode; // 0 = skin, 1 = points, 2 = wireframe
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uniform vec4 shellTint; // rgb tint + alpha for wireframe / shells
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in vec2 vSphereUV;
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in vec3 vViewPos;
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in float vWave;
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out vec4 fragColor;
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// Polynomial colormap fits (public domain, Matt Zucker).
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vec3 magma(float t) {
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const vec3 c0 = vec3(-0.002136485053939,-0.000749655052795,-0.005386127855323);
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const vec3 c1 = vec3( 0.251660540737164, 0.677523243683767, 2.494026599312351);
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const vec3 c2 = vec3( 8.353717279216625,-3.577719514958484, 0.314467903013257);
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const vec3 c3 = vec3(-27.66873308576866, 14.26473078096533,-13.64921318813922);
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const vec3 c4 = vec3( 52.17613981234068,-27.94360607168351, 12.94416944238394);
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const vec3 c5 = vec3(-50.76852536473588, 29.04658282127291, 4.234152993845980);
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const vec3 c6 = vec3( 18.65570506591883,-11.48977351997711,-5.601961508734096);
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return c0+t*(c1+t*(c2+t*(c3+t*(c4+t*(c5+t*c6)))));
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}
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vec3 viridis(float t) {
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const vec3 c0 = vec3( 0.277727327223418, 0.005407344544967, 0.334099805335306);
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const vec3 c1 = vec3( 0.105093043108577, 1.404613529898575, 1.384590162594685);
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const vec3 c2 = vec3(-0.330861828725556, 0.214847559468213, 0.095095163028237);
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const vec3 c3 = vec3(-4.634230498983486,-5.799100973351585,-19.33244095627987);
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const vec3 c4 = vec3( 6.228269936347081,14.17993336680509, 56.69055260068105);
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const vec3 c5 = vec3( 4.776384997670288,-13.74514537774601,-65.35303263337234);
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const vec3 c6 = vec3(-5.435455855934631, 4.645852612178535, 26.3124352495832);
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return c0+t*(c1+t*(c2+t*(c3+t*(c4+t*(c5+t*c6)))));
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}
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void main() {
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float u = fract(vSphereUV.x - scrollOffset);
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float mag = clamp(texture(spectroTex, vec2(u, vSphereUV.y)).r, 0.0, 1.0);
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vec3 col = (colormapId == 0) ? magma(mag) : viridis(mag);
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if (renderMode == 1) {
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// round point sprites + a touch of waveform sheen
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vec2 d = gl_PointCoord - vec2(0.5);
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if (dot(d, d) > 0.25) discard;
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col += 0.20 * abs(vWave);
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fragColor = vec4(col, 1.0);
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return;
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}
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if (renderMode == 2) {
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// wireframe / concentric shells: bright lines, tinted per draw
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vec3 wc = (col * 1.4 + vec3(0.06)) * shellTint.rgb;
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fragColor = vec4(wc, shellTint.a);
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return;
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}
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// skin: light the displaced relief with a screen-space face normal
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vec3 N = normalize(cross(dFdx(vViewPos), dFdy(vViewPos)));
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vec3 V = normalize(-vViewPos);
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if (dot(N, V) < 0.0) N = -N;
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vec3 L = normalize(vec3(0.45, 0.65, 0.75));
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float diff = max(dot(N, L), 0.0);
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float rim = pow(1.0 - max(dot(N, V), 0.0), 2.5);
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vec3 lit = col * (0.35 + 0.85 * diff) + rim * vec3(0.35, 0.45, 0.65);
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fragColor = vec4(lit, 1.0);
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}
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