Michaël Lemaire
818d82607e
The water light filter is now applied first to avoid computing terrain shadows when no light passes through the water layer.
122 lines
3.5 KiB
C++
122 lines
3.5 KiB
C++
#include "LightingManager.h"
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#include "LightFilter.h"
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#include "LightComponent.h"
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#include "Color.h"
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#include "SurfaceMaterial.h"
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LightingManager::LightingManager()
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{
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specularity = true;
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}
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void LightingManager::registerFilter(LightFilter* filter)
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{
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filters.push_back(filter);
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}
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bool LightingManager::alterLight(LightComponent &component, const Vector3 &location)
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{
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if (component.altered)
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{
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for (auto filter:filters)
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{
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if (not filter->applyLightFilter(component, location))
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{
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return false;
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}
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}
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}
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if (not specularity)
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{
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component.reflection = 0.0;
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}
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return component.color.getPower() > 0.0001;
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}
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void LightingManager::setSpecularity(bool enabled)
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{
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specularity = enabled;
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}
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Color LightingManager::applyFinalComponent(const LightComponent &component, const Vector3 &eye, const Vector3 &location, const Vector3 &normal, const SurfaceMaterial &material)
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{
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Color result, light_color;
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double normal_norm;
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Vector3 direction_inv;
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light_color = component.color;
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direction_inv = component.direction.normalize().scale(-1.0);
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normal_norm = normal.getNorm();
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if (normal_norm > 1.0)
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{
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normal_norm = 1.0;
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}
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result = COLOR_BLACK;
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/* diffused light */
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double diffuse = direction_inv.dotProduct(normal.normalize());
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double sign = (diffuse < 0.0) ? -1.0 : 1.0;
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if (material.hardness <= 0.5)
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{
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double hardness = material.hardness * 2.0;
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diffuse = (1.0 - hardness) * (diffuse * diffuse) * sign + hardness * diffuse;
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}
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else if (diffuse != 0.0)
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{
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double hardness = (material.hardness - 0.5) * 2.0;
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diffuse = (1.0 - hardness) * diffuse + hardness * sign * sqrt(fabs(diffuse));
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}
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diffuse = (diffuse + (1.0 - normal_norm)) / (1.0 + (1.0 - normal_norm));
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if (diffuse > 0.0)
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{
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result.r += diffuse * material._rgb.r * light_color.r;
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result.g += diffuse * material._rgb.g * light_color.g;
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result.b += diffuse * material._rgb.b * light_color.b;
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}
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/* specular reflection */
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if (material.reflection > 0.0 && component.reflection > 0.0)
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{
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Vector3 view = location.sub(eye).normalize();
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Vector3 reflect = direction_inv.sub(normal.scale(2.0 * direction_inv.dotProduct(normal)));
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double specular = reflect.dotProduct(view);
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if (specular > 0.0)
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{
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specular = pow(specular, material.shininess) * material.reflection * component.reflection * normal_norm;
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if (specular > 0.0)
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{
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result.r += specular * light_color.r;
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result.g += specular * light_color.g;
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result.b += specular * light_color.b;
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}
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}
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}
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/* specular reflection with fresnel effect */
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/*if (material->reflection > 0.0 && light->reflection > 0.0)
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{
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Vector3 view = v3Normalize(v3Sub(location, eye));
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Vector3 h = v3Normalize(v3Sub(direction_inv, view));
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double fresnel = 0.02 + 0.98 * pow(1.0 - v3Dot(v3Scale(view, -1.0), h), 5.0);
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double refl = v3Dot(h, normal);
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if (refl > 0.0)
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{
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double waterBrdf = fresnel * pow(refl, material->shininess);
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if (waterBrdf > 0.0)
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{
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refl = material->reflection * waterBrdf * light->reflection;
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result.r += refl * light_color.r;
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result.g += refl * light_color.g;
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result.b += refl * light_color.b;
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}
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}
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}*/
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return result;
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}
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