233 lines
8.1 KiB
C++
233 lines
8.1 KiB
C++
#include "CloudBasicLayerRenderer.h"
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#include <cassert>
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#include <cmath>
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#include "CloudLayerDefinition.h"
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#include "SoftwareRenderer.h"
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#include "NoiseGenerator.h"
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#include "Curve.h"
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#include "AtmosphereRenderer.h"
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#include "AtmosphereResult.h"
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#include "LightComponent.h"
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#include "clouds/BaseCloudsModel.h"
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#include "SurfaceMaterial.h"
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#include "Logs.h"
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#include "FloatNode.h"
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struct CloudSegment {
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Vector3 start;
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Vector3 end;
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double length;
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};
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CloudBasicLayerRenderer::CloudBasicLayerRenderer(SoftwareRenderer *parent) : BaseCloudLayerRenderer(parent) {
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}
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static inline double _getDistanceToBorder(BaseCloudsModel *model, const Vector3 &position) {
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return model->getDensity(position);
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}
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/**
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* Go through the cloud layer to find segments (parts of the lookup that are inside the cloud).
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*
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* @param definition The cloud layer
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* @param renderer The renderer environment
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* @param start Start position of the lookup (already optimized)
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* @param direction Normalized direction of the lookup
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* @param detail Level of noise detail required
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* @param max_segments Maximum number of segments to collect
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* @param max_inside_length Maximum length to spend inside the cloud
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* @param max_total_length Maximum lookup length
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* @param inside_length Resulting length inside cloud (sum of all segments length)
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* @param total_length Resulting lookup length
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* @param out_segments Allocated space to fill found segments
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* @return Number of segments found
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*/
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int CloudBasicLayerRenderer::findSegments(BaseCloudsModel *model, const Vector3 &start, const Vector3 &direction,
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int max_segments, double max_inside_length, double max_total_length,
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double *inside_length, double *total_length, CloudSegment *out_segments) {
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double ymin, ymax;
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int inside, segment_count;
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double current_total_length, current_inside_length;
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double step_length, segment_length;
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double min_step, max_step;
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double noise_distance;
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Vector3 walker, step, segment_start, offset;
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double render_precision;
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if (max_segments <= 0) {
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return 0;
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}
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model->getAltitudeRange(&ymin, &ymax);
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model->getDetailRange(&min_step, &max_step);
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render_precision = max_step - quality * (max_step - min_step);
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if (render_precision > max_total_length / 10.0) {
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render_precision = max_total_length / 10.0;
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} else if (render_precision < max_total_length / 2000.0) {
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render_precision = max_total_length / 2000.0;
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}
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segment_count = 0;
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current_total_length = 0.0;
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current_inside_length = 0.0;
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segment_length = 0.0;
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walker = start;
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offset = Vector3(model->getLayer()->propXOffset()->getValue(), 0.0, model->getLayer()->propZOffset()->getValue());
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noise_distance = _getDistanceToBorder(model, start.add(offset)) * render_precision;
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inside = 0;
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step = direction.scale(render_precision);
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do {
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walker = walker.add(step);
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step_length = step.getNorm();
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noise_distance = _getDistanceToBorder(model, walker.add(offset)) * render_precision;
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current_total_length += step_length;
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if (noise_distance > 0.0) {
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if (inside) {
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// inside the cloud
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segment_length += step_length;
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current_inside_length += step_length;
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step = direction.scale((noise_distance < render_precision) ? render_precision : noise_distance);
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} else {
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// entering the cloud
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inside = 1;
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segment_length = 0.0;
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segment_start = walker;
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current_inside_length += segment_length;
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step = direction.scale(render_precision);
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}
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} else {
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if (inside) {
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// exiting the cloud
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segment_length += step_length;
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current_inside_length += step_length;
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out_segments->start = segment_start;
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out_segments->end = walker;
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out_segments->length = segment_length;
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out_segments++;
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if (++segment_count >= max_segments) {
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break;
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}
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inside = 0;
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step = direction.scale(render_precision);
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} else {
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// searching for a cloud
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step = direction.scale((noise_distance > -render_precision) ? render_precision : -noise_distance);
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}
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}
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} while (inside || (walker.y >= ymin - 0.001 && walker.y <= ymax + 0.001 &&
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current_total_length < max_total_length && current_inside_length < max_inside_length));
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*total_length = current_total_length;
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*inside_length = current_inside_length;
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return segment_count;
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}
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Color CloudBasicLayerRenderer::getColor(BaseCloudsModel *model, const Vector3 &eye, const Vector3 &location) {
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int i, segment_count;
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double max_length, total_length, inside_length;
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Vector3 start, end, direction;
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Color result, col;
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CloudSegment segments[20];
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start = eye;
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end = location;
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if (!optimizeSearchLimits(model, &start, &end)) {
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return COLOR_TRANSPARENT;
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}
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direction = end.sub(start);
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max_length = direction.getNorm();
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direction = direction.normalize();
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result = COLOR_TRANSPARENT;
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double ymin, ymax;
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model->getAltitudeRange(&ymin, &ymax);
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double transparency_depth = (ymax - ymin) * 0.5;
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segment_count = findSegments(model, start, direction, 20, transparency_depth, max_length, &inside_length,
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&total_length, segments);
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for (i = segment_count - 1; i >= 0; i--) {
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SurfaceMaterial material(COLOR_WHITE);
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material.hardness = 0.25;
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material.reflection = 0.0;
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material.shininess = 0.0;
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material.validate();
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col = parent->applyLightingToSurface(segments[i].start, parent->getAtmosphereRenderer()->getSunDirection(),
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material);
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// Boost highly lighted area
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double boost = 1.0 + (col.getPower() * col.getPower());
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col.r *= boost;
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col.g *= boost;
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col.b *= boost;
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col.a = (segments[i].length >= transparency_depth) ? 1.0 : (segments[i].length / transparency_depth);
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result.mask(col);
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}
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// Opacify when hitting inside_length limit
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if (inside_length >= transparency_depth) {
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result.a = 1.0;
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} else if (inside_length >= transparency_depth * 0.8) {
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result.a += (1.0 - result.a) * ((inside_length - transparency_depth * 0.8) / (transparency_depth * 0.2));
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}
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// Apply aerial perspective
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if (result.a > 0.00001) {
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assert(segment_count > 0);
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double a = result.a;
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// TODO Don't apply it only at first segment
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result = parent->getAtmosphereRenderer()->applyAerialPerspective(segments[0].start, result).final;
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result.a = a;
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}
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return result;
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}
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bool CloudBasicLayerRenderer::alterLight(BaseCloudsModel *model, LightComponent *light, const Vector3 &,
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const Vector3 &location) {
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Vector3 start, end, direction;
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double inside_depth, total_depth, factor;
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CloudSegment segments[20];
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start = location;
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direction = light->direction.scale(-1.0);
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end = location.add(direction.scale(10000.0));
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if (not optimizeSearchLimits(model, &start, &end)) {
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return false;
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}
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double ymin, ymax;
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model->getAltitudeRange(&ymin, &ymax);
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double light_traversal = (ymax - ymin) * 1.2;
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findSegments(model, start, direction, 20, light_traversal, end.sub(start).getNorm(), &inside_depth, &total_depth,
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segments);
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if (light_traversal < 0.0001) {
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factor = 0.0;
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} else {
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factor = inside_depth / light_traversal;
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if (factor > 1.0) {
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factor = 1.0;
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} else if (factor > 0.00001) {
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factor = sqrt(factor);
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}
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}
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double miminum_light = 0.3;
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factor = 1.0 - (1.0 - miminum_light) * 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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return true;
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}
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