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e821f736de
Member variables acting as caches is one of the areas where marking variables as mutable makes sense. We can do this to allow for the elimination of const_cast in some member functions.
121 lines
3.5 KiB
C++
121 lines
3.5 KiB
C++
#include "Runtime/Graphics/CLight.hpp"
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#include <cfloat>
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namespace urde {
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constexpr zeus::CVector3f kDefaultPosition(0.f, 0.f, 0.f);
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constexpr zeus::CVector3f kDefaultDirection(0.f, -1.f, 0.f);
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float CLight::CalculateLightRadius() const {
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if (x28_distL < FLT_EPSILON && x2c_distQ < FLT_EPSILON)
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return FLT_MAX;
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float intens = GetIntensity();
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if (x2c_distQ > FLT_EPSILON) {
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if (intens <= FLT_EPSILON)
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return 0.f;
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return std::sqrt(intens / (0.0588235f * x2c_distQ));
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}
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if (x28_distL > FLT_EPSILON)
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return intens / (0.0588235f * x28_distL);
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return 0.f;
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}
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float CLight::GetIntensity() const {
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if (x4c_24_intensityDirty) {
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x4c_24_intensityDirty = false;
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float coef = 1.f;
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if (x1c_type == ELightType::Custom) {
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coef = x30_angleC;
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}
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x48_cachedIntensity = coef * std::max(x18_color.r(), std::max(x18_color.g(), x18_color.b()));
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}
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return x48_cachedIntensity;
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}
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float CLight::GetRadius() const {
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if (x4c_25_radiusDirty) {
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x44_cachedRadius = CalculateLightRadius();
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x4c_25_radiusDirty = false;
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}
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return x44_cachedRadius;
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}
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CLight::CLight(const zeus::CVector3f& pos, const zeus::CVector3f& dir, const zeus::CColor& color, float distC,
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float distL, float distQ, float angleC, float angleL, float angleQ)
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: x0_pos(pos)
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, xc_dir(dir)
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, x18_color(color)
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, x24_distC(distC)
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, x28_distL(distL)
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, x2c_distQ(distQ)
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, x30_angleC(angleC)
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, x34_angleL(angleL)
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, x38_angleQ(angleQ)
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, x4c_24_intensityDirty(true)
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, x4c_25_radiusDirty(true) {}
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CLight::CLight(ELightType type, const zeus::CVector3f& pos, const zeus::CVector3f& dir, const zeus::CColor& color,
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float cutoff)
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: x0_pos(pos)
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, xc_dir(dir)
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, x18_color(color)
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, x1c_type(type)
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, x20_spotCutoff(cutoff)
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, x4c_24_intensityDirty(true)
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, x4c_25_radiusDirty(true) {
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switch (type) {
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case ELightType::Spot: {
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const float cosCutoff = std::cos(zeus::degToRad(cutoff));
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x30_angleC = 0.f;
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x34_angleL = -cosCutoff / (1.0f - cosCutoff);
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x38_angleQ = 1.f / (1.0f - cosCutoff);
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break;
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}
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case ELightType::Directional: {
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x24_distC = 1.f;
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x28_distL = 0.f;
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x2c_distQ = 0.f;
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break;
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}
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default:
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break;
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}
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}
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zeus::CColor CLight::GetNormalIndependentLightingAtPoint(const zeus::CVector3f& point) const {
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if (x1c_type == ELightType::LocalAmbient)
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return x18_color;
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float dist = std::max((x0_pos - point).magnitude(), FLT_EPSILON);
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return x18_color * (1.f / (x2c_distQ * dist * dist + x28_distL * dist + x24_distC));
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}
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CLight CLight::BuildDirectional(const zeus::CVector3f& dir, const zeus::CColor& color) {
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return CLight(ELightType::Directional, kDefaultPosition, dir, color, 180.f);
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}
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CLight CLight::BuildSpot(const zeus::CVector3f& pos, const zeus::CVector3f& dir, const zeus::CColor& color,
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float angle) {
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return CLight(ELightType::Spot, pos, dir, color, angle);
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}
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CLight CLight::BuildPoint(const zeus::CVector3f& pos, const zeus::CColor& color) {
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return CLight(ELightType::Point, pos, kDefaultDirection, color, 180.f);
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}
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CLight CLight::BuildCustom(const zeus::CVector3f& pos, const zeus::CVector3f& dir, const zeus::CColor& color,
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float distC, float distL, float distQ, float angleC, float angleL, float angleQ) {
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return CLight(pos, dir, color, distC, distL, distQ, angleC, angleL, angleQ);
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}
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CLight CLight::BuildLocalAmbient(const zeus::CVector3f& pos, const zeus::CColor& color) {
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return CLight(ELightType::LocalAmbient, pos, kDefaultDirection, color, 180.f);
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}
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} // namespace urde
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