29 lines
997 B
C++
29 lines
997 B
C++
#include "GodRaysResult.h"
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#include <cmath>
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GodRaysResult::GodRaysResult(double inside_length, double full_length)
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: inside_length(inside_length), full_length(full_length) {
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}
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Color GodRaysResult::apply(const Color &raw, const Color &atmosphered, const GodRaysParams ¶ms) {
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if (inside_length == 0.0) {
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return raw;
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} else if (inside_length < full_length) {
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double diff = full_length - inside_length;
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double factor = 1.0 - params.penetration * diff;
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double minimum = params.resistance;
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double complement = 1.0 - minimum;
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if (factor < minimum) {
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factor = minimum;
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} else {
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factor = pow((factor - minimum) / complement, params.boost) * complement + minimum;
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}
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return Color(raw.r + (atmosphered.r - raw.r) * factor, raw.g + (atmosphered.g - raw.g) * factor,
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raw.b + (atmosphered.b - raw.b) * factor, atmosphered.a);
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} else {
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return atmosphered;
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}
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}
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