Michaël Lemaire
6cd571f92f
git-svn-id: https://subversion.assembla.com/svn/thunderk/paysages@424 b1fd45b6-86a6-48da-8261-f70d1f35bdcc
375 lines
13 KiB
C
375 lines
13 KiB
C
#include "sky.h"
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#include <stdlib.h>
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#include <math.h>
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#include "shared/types.h"
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#include "color.h"
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#include "clouds.h"
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#include "euclid.h"
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#include "lighting.h"
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#include "render.h"
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#include "tools.h"
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#include "skypreetham.h"
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#include "skyrayleigh.h"
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#define SPHERE_SIZE 1000.0
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/******************************** Configuration ********************************/
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void skySave(PackStream* stream, SkyDefinition* definition)
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{
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packWriteInt(stream, (int*)&definition->model);
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packWriteDouble(stream, &definition->daytime);
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colorSave(stream, &definition->sun_color);
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packWriteDouble(stream, &definition->sun_radius);
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packWriteDouble(stream, &definition->sun_halo_size);
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curveSave(stream, definition->sun_halo_profile);
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packWriteDouble(stream, &definition->dome_lighting);
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packWriteInt(stream, &definition->model_custom.auto_from_daytime);
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colorSave(stream, &definition->model_custom.zenith_color);
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colorSave(stream, &definition->model_custom.haze_color);
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packWriteDouble(stream, &definition->model_custom.haze_height);
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packWriteDouble(stream, &definition->model_custom.haze_smoothing);
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packWriteDouble(stream, &definition->model_preetham.turbidity);
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}
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void skyLoad(PackStream* stream, SkyDefinition* definition)
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{
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packReadInt(stream, (int*)&definition->model);
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packReadDouble(stream, &definition->daytime);
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colorLoad(stream, &definition->sun_color);
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packReadDouble(stream, &definition->sun_radius);
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packReadDouble(stream, &definition->sun_halo_size);
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curveLoad(stream, definition->sun_halo_profile);
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packReadDouble(stream, &definition->dome_lighting);
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packReadInt(stream, &definition->model_custom.auto_from_daytime);
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colorLoad(stream, &definition->model_custom.zenith_color);
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colorLoad(stream, &definition->model_custom.haze_color);
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packReadDouble(stream, &definition->model_custom.haze_height);
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packReadDouble(stream, &definition->model_custom.haze_smoothing);
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packReadDouble(stream, &definition->model_preetham.turbidity);
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skyValidateDefinition(definition);
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}
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SkyDefinition skyCreateDefinition()
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{
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SkyDefinition def;
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def.model = SKY_MODEL_CUSTOM;
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def.daytime = 0.0;
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def.sun_color = COLOR_BLACK;
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def.sun_radius = 1.0;
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def.sun_halo_size = 0.0;
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def.sun_halo_profile = curveCreate();
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def.dome_lighting = 0.0;
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def.model_custom.auto_from_daytime = 0;
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def.model_custom.zenith_color = COLOR_BLACK;
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def.model_custom.haze_color = COLOR_BLACK;
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def.model_custom.haze_height = 0.0;
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def.model_custom.haze_smoothing = 0.0;
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def.model_custom._sky_gradation = colorGradationCreate();
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def.model_preetham.turbidity = 0.0;
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skyValidateDefinition(&def);
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return def;
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}
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void skyDeleteDefinition(SkyDefinition* definition)
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{
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curveDelete(definition->sun_halo_profile);
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colorGradationDelete(definition->model_custom._sky_gradation);
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}
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void skyCopyDefinition(SkyDefinition* source, SkyDefinition* destination)
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{
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destination->model = source->model;
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destination->daytime = source->daytime;
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destination->sun_color = source->sun_color;
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destination->sun_radius = source->sun_radius;
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destination->sun_halo_size = source->sun_halo_size;
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destination->dome_lighting = source->dome_lighting;
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destination->model_custom.auto_from_daytime = source->model_custom.auto_from_daytime;
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destination->model_custom.zenith_color = source->model_custom.zenith_color;
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destination->model_custom.haze_color = source->model_custom.haze_color;
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destination->model_custom.haze_height = source->model_custom.haze_height;
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destination->model_custom.haze_smoothing = source->model_custom.haze_smoothing;
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destination->model_preetham.turbidity = source->model_preetham.turbidity;
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curveCopy(source->sun_halo_profile, destination->sun_halo_profile);
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skyValidateDefinition(destination);
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}
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static void _setAutoCustomModel(SkyDefinition* definition)
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{
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ColorGradation* zenith_gradation;
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ColorGradation* haze_gradation;
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zenith_gradation = colorGradationCreate();
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haze_gradation = colorGradationCreate();
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colorGradationQuickAddRgb(zenith_gradation, 0.2, 0.03, 0.03, 0.05);
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colorGradationQuickAddRgb(zenith_gradation, 0.25, 0.25, 0.33, 0.37);
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colorGradationQuickAddRgb(zenith_gradation, 0.35, 0.52, 0.63, 0.8);
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colorGradationQuickAddRgb(zenith_gradation, 0.65, 0.52, 0.63, 0.8);
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colorGradationQuickAddRgb(zenith_gradation, 0.75, 0.25, 0.33, 0.37);
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colorGradationQuickAddRgb(zenith_gradation, 0.8, 0.03, 0.03, 0.05);
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colorGradationQuickAddRgb(haze_gradation, 0.2, 0.05, 0.05, 0.08);
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colorGradationQuickAddRgb(haze_gradation, 0.25, 0.55, 0.42, 0.42);
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colorGradationQuickAddRgb(haze_gradation, 0.3, 0.6, 0.6, 0.6);
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colorGradationQuickAddRgb(haze_gradation, 0.4, 0.92, 0.93, 1.0);
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colorGradationQuickAddRgb(haze_gradation, 0.6, 0.92, 0.93, 1.0);
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colorGradationQuickAddRgb(haze_gradation, 0.7, 0.6, 0.6, 0.8);
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colorGradationQuickAddRgb(haze_gradation, 0.75, 0.62, 0.50, 0.42);
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colorGradationQuickAddRgb(haze_gradation, 0.8, 0.05, 0.05, 0.08);
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definition->model_custom.zenith_color = colorGradationGet(zenith_gradation, definition->daytime);
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definition->model_custom.haze_color = colorGradationGet(haze_gradation, definition->daytime);
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colorGradationDelete(zenith_gradation);
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colorGradationDelete(haze_gradation);
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}
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void skyValidateDefinition(SkyDefinition* definition)
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{
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if (definition->model == SKY_MODEL_CUSTOM)
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{
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if (definition->model_custom.auto_from_daytime)
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{
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_setAutoCustomModel(definition);
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}
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colorGradationClear(definition->model_custom._sky_gradation);
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colorGradationQuickAdd(definition->model_custom._sky_gradation, 0.0, &definition->model_custom.haze_color);
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colorGradationQuickAdd(definition->model_custom._sky_gradation, definition->model_custom.haze_height - definition->model_custom.haze_smoothing, &definition->model_custom.haze_color);
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colorGradationQuickAdd(definition->model_custom._sky_gradation, definition->model_custom.haze_height, &definition->model_custom.zenith_color);
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colorGradationQuickAdd(definition->model_custom._sky_gradation, 1.0, &definition->model_custom.zenith_color);
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}
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}
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static inline void _addDomeLight(SkyDefinition* sky, Renderer* renderer, LightDefinition* light, Vector3 direction, double factor)
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{
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light->direction = v3Scale(direction, -1.0);
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light->color = skyGetColor(sky, renderer, VECTOR_ZERO, direction);
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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 = 0.0;
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light->filtered = 0;
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light->masked = 0;
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}
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int skyGetLights(SkyDefinition* sky, Renderer* renderer, LightDefinition* lights, int max_lights)
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{
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double sun_angle;
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Vector3 sun_direction;
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int nblights = 0;
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sun_angle = (sky->daytime + 0.75) * M_PI * 2.0;
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sun_direction.x = cos(sun_angle);
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sun_direction.y = sin(sun_angle);
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sun_direction.z = 0.0;
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/* TODO Moon light */
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if (max_lights > 0)
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{
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/* Direct light from the sun */
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lights[0].direction = v3Scale(sun_direction, -1.0);
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lights[0].color = sky->sun_color;
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lights[0].reflection = 1.0;
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lights[0].filtered = 1;
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lights[0].masked = 1;
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nblights = 1;
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max_lights--;
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}
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if (max_lights > 0)
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{
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/* Indirect lighting by skydome scattering */
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int xsamples, ysamples, samples, x, y;
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double xstep, ystep, factor;
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Vector3 direction;
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samples = (renderer->render_quality < 5) ? 9 : (renderer->render_quality * 4 + 1);
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samples = samples > max_lights ? max_lights : samples;
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factor = sky->dome_lighting / (double)samples;
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_addDomeLight(sky, renderer, lights + nblights, VECTOR_UP, factor);
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nblights++;
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samples--;
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if (samples >= 2)
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{
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xsamples = samples / 2;
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ysamples = samples / xsamples;
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xstep = M_PI * 2.0 / (double)xsamples;
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ystep = M_PI * 0.5 / (double)ysamples;
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for (x = 0; x < xsamples; x++)
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{
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for (y = 0; y < ysamples; y++)
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{
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direction.x = cos(x * xstep) * cos(y * ystep);
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direction.y = -sin(y * ystep);
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direction.z = sin(x * xstep) * cos(y * ystep);
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_addDomeLight(sky, renderer, lights + nblights, direction, factor);
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nblights++;
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}
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}
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}
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}
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return nblights;
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}
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/******************************** Rendering ********************************/
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Color skyGetColor(SkyDefinition* definition, Renderer* renderer, Vector3 eye, Vector3 look)
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{
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double dist;
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Vector3 sun_position;
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Color sun_color, sky_color;
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sun_position = skyGetSunDirection(definition);
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look = v3Normalize(look);
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dist = v3Norm(v3Sub(look, sun_position));
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if (definition->model == SKY_MODEL_PREETHAM)
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{
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sky_color = skyPreethamGetColor(eye, look, sun_position, definition->model_preetham.turbidity);
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}
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else if (definition->model == SKY_MODEL_RAYLEIGH_MIE)
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{
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sky_color = skyRayleighGetColor(eye, look, sun_position);
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}
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else
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{
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sky_color = colorGradationGet(definition->model_custom._sky_gradation, look.y * 0.5 + 0.5);
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}
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if (dist < definition->sun_radius + definition->sun_halo_size)
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{
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sun_color = definition->sun_color;
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if (dist <= definition->sun_radius)
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{
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return sun_color;
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}
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else
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{
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dist = (dist - definition->sun_radius) / definition->sun_halo_size;
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sun_color.a = curveGetValue(definition->sun_halo_profile, dist);
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colorMask(&sky_color, &sun_color);
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return sky_color;
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}
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}
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else
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{
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return sky_color;
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}
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}
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static Color _postProcessFragment(Renderer* renderer, Vector3 location, void* data)
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{
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Vector3 direction;
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Color result;
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SkyDefinition* definition;
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definition = (SkyDefinition*)data;
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direction = v3Sub(location, renderer->camera_location);
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result = skyGetColor(definition, renderer, renderer->camera_location, v3Normalize(direction));
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result = renderer->applyClouds(renderer, result, renderer->camera_location, v3Add(renderer->camera_location, v3Scale(direction, 10.0)));
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return result;
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}
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void skyRender(SkyDefinition* definition, Renderer* renderer)
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{
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int res_i, res_j;
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int i, j;
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double step_i, step_j;
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double current_i, current_j;
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Vector3 vertex1, vertex2, vertex3, vertex4;
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Vector3 direction;
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res_i = renderer->render_quality * 40;
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res_j = renderer->render_quality * 20;
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step_i = M_PI * 2.0 / (double)res_i;
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step_j = M_PI / (double)res_j;
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for (j = 0; j < res_j; j++)
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{
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if (!renderer->addRenderProgress(renderer, 0.0))
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{
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return;
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}
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current_j = (double)(j - res_j / 2) * step_j;
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for (i = 0; i < res_i; i++)
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{
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current_i = (double)i * step_i;
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direction.x = SPHERE_SIZE * cos(current_i) * cos(current_j);
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direction.y = SPHERE_SIZE * sin(current_j);
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direction.z = SPHERE_SIZE * sin(current_i) * cos(current_j);
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vertex1 = v3Add(renderer->camera_location, direction);
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direction.x = SPHERE_SIZE * cos(current_i + step_i) * cos(current_j);
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direction.y = SPHERE_SIZE * sin(current_j);
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direction.z = SPHERE_SIZE * sin(current_i + step_i) * cos(current_j);
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vertex2 = v3Add(renderer->camera_location, direction);
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direction.x = SPHERE_SIZE * cos(current_i + step_i) * cos(current_j + step_j);
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direction.y = SPHERE_SIZE * sin(current_j + step_j);
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direction.z = SPHERE_SIZE * sin(current_i + step_i) * cos(current_j + step_j);
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vertex3 = v3Add(renderer->camera_location, direction);
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direction.x = SPHERE_SIZE * cos(current_i) * cos(current_j + step_j);
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direction.y = SPHERE_SIZE * sin(current_j + step_j);
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direction.z = SPHERE_SIZE * sin(current_i) * cos(current_j + step_j);
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vertex4 = v3Add(renderer->camera_location, direction);
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/* TODO Triangles at poles */
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renderer->pushQuad(renderer, vertex1, vertex4, vertex3, vertex2, _postProcessFragment, definition);
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}
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}
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}
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Vector3 skyGetSunDirection(SkyDefinition* definition)
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{
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Vector3 result;
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double sun_angle = (definition->daytime + 0.75) * M_PI * 2.0;
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result.x = cos(sun_angle);
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result.y = sin(sun_angle);
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result.z = 0.0;
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return result;
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}
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Color skyGetSunColor(SkyDefinition* definition)
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{
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return definition->sun_color;
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}
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Color skyGetZenithColor(SkyDefinition* definition)
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{
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Vector3 look = {0.0, 1.0, 0.0};
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return skyGetColor(definition, NULL, VECTOR_ZERO, look);
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}
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Color skyGetHorizonColor(SkyDefinition* definition)
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{
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Vector3 look = {0.0, 0.0, 1.0};
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return skyGetColor(definition, NULL, VECTOR_ZERO, look);
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}
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