Michaël Lemaire
818d82607e
The water light filter is now applied first to avoid computing terrain shadows when no light passes through the water layer.
279 lines
7.4 KiB
C++
279 lines
7.4 KiB
C++
#include "WaterRenderer.h"
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#include "SoftwareRenderer.h"
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#include "TerrainRenderer.h"
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#include "WaterDefinition.h"
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#include "NoiseGenerator.h"
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#include "LightComponent.h"
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#include "Scenery.h"
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#include "SurfaceMaterial.h"
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#include "NoiseFunctionSimplex.h"
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WaterRenderer::WaterRenderer(SoftwareRenderer* parent):
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parent(parent)
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{
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noise = new NoiseFunctionSimplex();
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}
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WaterRenderer::~WaterRenderer()
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{
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delete noise;
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}
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void WaterRenderer::update()
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{
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WaterDefinition* definition = parent->getScenery()->getWater();
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noise->setState(*definition->noise_state);
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noise->setScaling(definition->scaling * 0.3, definition->waves_height * 0.05);
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noise->setStep(0.3);
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}
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static inline double _getHeight(FractalNoise* noise, double x, double z)
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{
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return noise->get2d(0.00001, x, z);
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}
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static inline Vector3 _getNormal(FractalNoise* noise, Vector3 base, double detail)
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{
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Vector3 back, right;
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double x, z;
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x = base.x;
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z = base.z;
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back.x = x;
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back.y = _getHeight(noise, x, z + detail);
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back.z = z + detail;
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back = back.sub(base);
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right.x = x + detail;
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right.y = _getHeight(noise, x + detail, z);
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right.z = z;
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right = right.sub(base);
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return back.crossProduct(right).normalize();
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}
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static inline Vector3 _reflectRay(Vector3 incoming, Vector3 normal)
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{
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double c;
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c = normal.dotProduct(incoming.scale(-1.0));
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return incoming.add(normal.scale(2.0 * c));
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}
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static inline Vector3 _refractRay(Vector3 incoming, Vector3 normal)
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{
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double c1, c2, f;
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f = 1.0 / 1.33;
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c1 = normal.dotProduct(incoming.scale(-1.0));
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c2 = sqrt(1.0 - pow(f, 2.0) * (1.0 - pow(c1, 2.0)));
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if (c1 >= 0.0)
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{
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return incoming.scale(f).add(normal.scale(f * c1 - c2));
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}
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else
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{
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return incoming.scale(f).add(normal.scale(c2 - f * c1));
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}
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}
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static inline Color _getFoamMask(SoftwareRenderer* renderer, WaterDefinition* definition, FractalNoise* noise, Vector3 location, Vector3 normal, double detail)
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{
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Color result;
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double foam_factor, normal_diff, location_offset;
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location_offset = 2.0 * detail;
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foam_factor = 0.0;
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location.x += location_offset;
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normal_diff = 1.0 - normal.dotProduct(_getNormal(noise, location, detail));
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if (normal_diff > foam_factor)
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{
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foam_factor = normal_diff;
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}
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location.x -= location_offset * 2.0;
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normal_diff = 1.0 - normal.dotProduct(_getNormal(noise, location, detail));
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if (normal_diff > foam_factor)
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{
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foam_factor = normal_diff;
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}
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location.x += location_offset;
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location.z -= location_offset;
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normal_diff = 1.0 - normal.dotProduct(_getNormal(noise, location, detail));
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if (normal_diff > foam_factor)
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{
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foam_factor = normal_diff;
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}
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location.z += location_offset * 2.0;
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normal_diff = 1.0 - normal.dotProduct(_getNormal(noise, location, detail));
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if (normal_diff > foam_factor)
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{
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foam_factor = normal_diff;
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}
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foam_factor *= 10.0;
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if (foam_factor > 1.0)
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{
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foam_factor = 1.0;
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}
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if (foam_factor <= 1.0 - definition->foam_coverage)
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{
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return COLOR_TRANSPARENT;
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}
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foam_factor = (foam_factor - (1.0 - definition->foam_coverage)) * definition->foam_coverage;
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/* TODO Re-use base lighting status */
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result = renderer->applyLightingToSurface(location, normal, *definition->foam_material);
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result.r *= 2.0;
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result.g *= 2.0;
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result.b *= 2.0;
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/* TODO This should be configurable */
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if (foam_factor > 0.2)
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{
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result.a = 0.8;
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}
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else
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{
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result.a = 0.8 * (foam_factor / 0.2);
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}
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return result;
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}
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HeightInfo WaterRenderer::getHeightInfo()
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{
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HeightInfo info;
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double noise_minvalue, noise_maxvalue;
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info.base_height = 0.0;
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// TODO
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//noise->getRange(&noise_minvalue, &noise_maxvalue);
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noise_minvalue = noise_maxvalue = 0.0;
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info.min_height = info.base_height + noise_minvalue;
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info.max_height = info.base_height + noise_maxvalue;
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return info;
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}
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double WaterRenderer::getHeight(double x, double z)
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{
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return _getHeight(noise, x, z);
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}
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WaterRenderer::WaterResult WaterRenderer::getResult(double x, double z)
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{
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WaterDefinition* definition = parent->getScenery()->getWater();
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WaterResult result;
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RayCastingResult refracted;
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Vector3 location, normal, look_direction;
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Color color, foam;
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double detail, depth;
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location.x = x;
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location.y = _getHeight(noise, x, z);
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location.z = z;
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result.location = location;
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detail = parent->getPrecision(location) * 0.1;
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if (detail < 0.00001)
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{
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detail = 0.00001;
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}
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normal = _getNormal(noise, location, detail);
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look_direction = location.sub(parent->getCameraLocation(location)).normalize();
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/* Reflection */
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if (definition->reflection == 0.0)
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{
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result.reflected = COLOR_BLACK;
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}
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else
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{
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result.reflected = parent->rayWalking(location, _reflectRay(look_direction, normal), 1, 0, 1, 1).hit_color;
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}
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/* Transparency/refraction */
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if (definition->transparency == 0.0)
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{
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result.refracted = COLOR_BLACK;
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}
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else
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{
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Color depth_color = *definition->depth_color;
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refracted = parent->rayWalking(location, _refractRay(look_direction, normal), 1, 0, 1, 1);
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depth = location.sub(refracted.hit_location).getNorm();
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depth_color.limitPower(refracted.hit_color.getPower());
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if (depth > definition->transparency_depth)
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{
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result.refracted = depth_color;
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}
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else
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{
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depth /= definition->transparency_depth;
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result.refracted.r = refracted.hit_color.r * (1.0 - depth) + depth_color.r * depth;
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result.refracted.g = refracted.hit_color.g * (1.0 - depth) + depth_color.g * depth;
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result.refracted.b = refracted.hit_color.b * (1.0 - depth) + depth_color.b * depth;
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result.refracted.a = 1.0;
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}
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}
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/* Lighting from environment */
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color = parent->applyLightingToSurface(location, normal, *definition->material);
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color.r += result.reflected.r * definition->reflection + result.refracted.r * definition->transparency;
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color.g += result.reflected.g * definition->reflection + result.refracted.g * definition->transparency;
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color.b += result.reflected.b * definition->reflection + result.refracted.b * definition->transparency;
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/* Merge with foam */
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foam = _getFoamMask(parent, definition, noise, location, normal, detail);
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color.mask(foam);
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/* Bring color to the camera */
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color = parent->applyMediumTraversal(location, color);
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result.base = definition->material->_rgb;
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result.final = color;
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return result;
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}
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bool WaterRenderer::applyLightFilter(LightComponent &light, const Vector3 &at)
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{
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WaterDefinition* definition = parent->getScenery()->getWater();
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double factor;
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if (at.y < 0.0)
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{
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if (light.direction.y <= -0.00001)
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{
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factor = -at.y / (-light.direction.y * definition->lighting_depth);
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if (factor > 1.0)
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{
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factor = 1.0;
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}
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factor = 1.0 - factor;
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light.color.r *= factor;
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light.color.g *= factor;
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light.color.b *= factor;
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light.reflection *= factor;
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return factor > 0.0;
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}
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else
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{
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light.color = COLOR_BLACK;
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return false;
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}
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}
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else
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{
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return true;
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}
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}
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