44 lines
1.6 KiB
GLSL
44 lines
1.6 KiB
GLSL
vec3 GetNetherNoise(vec3 viewPos, float VdotU, float dither) {
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float visibility = clamp01(VdotU * 1.875 - 0.225);
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visibility *= 1.0 - VdotU * 0.75 - maxBlindnessDarkness;
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if (visibility > 0.0) {
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vec3 spots = vec3(0.0);
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float eyeAltitude1 = eyeAltitude * 0.005;
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float noiseHeightFactor = max(0.0, 1.5 - eyeAltitude1 / (eyeAltitude1 + 1.0));
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noiseHeightFactor *= noiseHeightFactor;
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float noiseHeight = noiseHeightFactor * 0.5;
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vec3 wpos = (gbufferModelViewInverse * vec4(viewPos, 1.0)).xyz;
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wpos.xz /= wpos.y;
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vec2 cameraPositionM = cameraPosition.xz * 0.0075;
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cameraPositionM.x += frameTimeCounter * 0.004;
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int sampleCount = 10;
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int sampleCountP = sampleCount + 5;
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float ditherM = dither + 5.0;
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float wind = fract(frameTimeCounter * 0.0125);
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for (int i = 0; i < sampleCount; i++) {
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float current = pow2((i + ditherM) / sampleCountP);
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vec2 planePos = wpos.xz * (0.8 + current) * noiseHeight;
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planePos = (planePos * 0.5 + cameraPositionM * 0.5) * 1.5;
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float noiseSpots = texture2DLod(noisetex, planePos * 0.5, 0.0).g;
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vec3 noise = texture2DLod(noisetex, vec2(noiseSpots) + wind, 0.0).g * netherColor * 2.5 - netherColor * 1.3;
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float currentM = 1.0 - current;
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spots += noise * currentM * 6.0;
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}
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#ifdef RAIN_ATMOSPHERE
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spots += 2.0 * isLightningActive();
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#endif
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return spots * visibility / sampleCount;
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}
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return vec3(0.0);
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}
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