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paysages3d/lib_paysages/sky.c

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#include "sky.h"
#include <stdlib.h>
#include <math.h>
#include "shared/types.h"
#include "shared/constants.h"
#include "color.h"
#include "clouds.h"
#include "euclid.h"
#include "lighting.h"
#include "render.h"
#include "tools.h"
#define SPHERE_SIZE 1000.0
void skyInit()
{
}
void skyQuit()
{
}
void skySave(PackStream* stream, SkyDefinition* definition)
{
packWriteDouble(stream, &definition->daytime);
colorGradationSave(stream, definition->sun_color);
packWriteDouble(stream, &definition->sun_radius);
colorGradationSave(stream, definition->zenith_color);
colorGradationSave(stream, definition->haze_color);
packWriteDouble(stream, &definition->haze_height);
packWriteDouble(stream, &definition->haze_smoothing);
}
void skyLoad(PackStream* stream, SkyDefinition* definition)
{
packReadDouble(stream, &definition->daytime);
colorGradationLoad(stream, definition->sun_color);
packReadDouble(stream, &definition->sun_radius);
colorGradationLoad(stream, definition->zenith_color);
colorGradationLoad(stream, definition->haze_color);
packReadDouble(stream, &definition->haze_height);
packReadDouble(stream, &definition->haze_smoothing);
skyValidateDefinition(definition);
}
SkyDefinition skyCreateDefinition()
{
SkyDefinition def;
def.daytime = 0.0;
def.sun_color = colorGradationCreate();
def.sun_radius = 1.0;
def.zenith_color = colorGradationCreate();
def.haze_color = colorGradationCreate();
def.haze_height = 0.0;
def.haze_smoothing = 0.0;
skyValidateDefinition(&def);
return def;
}
void skyDeleteDefinition(SkyDefinition* definition)
{
colorGradationDelete(definition->sun_color);
colorGradationDelete(definition->zenith_color);
colorGradationDelete(definition->haze_color);
}
void skyCopyDefinition(SkyDefinition* source, SkyDefinition* destination)
{
destination->daytime = source->daytime;
destination->sun_radius = source->sun_radius;
destination->haze_height = source->haze_height;
destination->haze_smoothing = source->haze_smoothing;
colorGradationCopy(source->sun_color, destination->sun_color);
colorGradationCopy(source->zenith_color, destination->zenith_color);
colorGradationCopy(source->haze_color, destination->haze_color);
colorGradationCopy(source->_sky_gradation, destination->_sky_gradation);
}
void skyValidateDefinition(SkyDefinition* definition)
{
Color zenith, haze;
zenith = colorGradationGet(definition->zenith_color, definition->daytime);
haze = colorGradationGet(definition->haze_color, definition->daytime);
definition->_sky_gradation = colorGradationCreate();
colorGradationQuickAdd(definition->_sky_gradation, 0.0, &haze);
colorGradationQuickAdd(definition->_sky_gradation, definition->haze_height - definition->haze_smoothing, &haze);
colorGradationQuickAdd(definition->_sky_gradation, definition->haze_height, &zenith);
colorGradationQuickAdd(definition->_sky_gradation, 1.0, &zenith);
}
int skyGetLights(SkyDefinition* sky, LightDefinition* lights, int max_lights)
{
double sun_angle;
Vector3 sun_direction;
int nblights = 0;
sun_angle = (sky->daytime + 0.75) * M_PI * 2.0;
sun_direction.x = cos(sun_angle);
sun_direction.y = sin(sun_angle);
sun_direction.z = 0.0;
/* TODO Night lights */
if (max_lights > 0)
{
/* Light from the sun */
lights[0].direction = v3Scale(sun_direction, -1.0);
lights[0].color = colorGradationGet(sky->sun_color, sky->daytime);
lights[0].reflection = 1.0;
lights[0].filtered = 1;
lights[0].masked = 1;
lights[0].amplitude = 0.0;
nblights = 1;
if (max_lights > 1)
{
/* Skydome lighting */
lights[1].direction.x = 0.0;
lights[1].direction.y = -1.0;
lights[1].direction.z = 0.0;
lights[1].color = colorGradationGet(sky->zenith_color, sky->daytime);
lights[1].color.r *= 0.6;
lights[1].color.g *= 0.6;
lights[1].color.b *= 0.6;
lights[1].reflection = 0.0;
lights[1].filtered = 1;
lights[1].masked = 0;
lights[1].amplitude = M_PI / 2.0;
nblights = 2;
}
}
return nblights;
}
Color skyGetColor(SkyDefinition* definition, Renderer* renderer, Vector3 eye, Vector3 look)
{
double sun_angle, dist;
Vector3 sun_position;
Color sun_color, sky_color;
sun_angle = (definition->daytime + 0.75) * M_PI * 2.0;
sun_position.x = cos(sun_angle);
sun_position.y = sin(sun_angle);
sun_position.z = 0.0;
look = v3Normalize(look);
dist = v3Norm(v3Sub(look, sun_position));
sky_color = colorGradationGet(definition->_sky_gradation, look.y * 0.5 + 0.5);
if (dist < definition->sun_radius)
{
dist = dist / definition->sun_radius;
sun_color = colorGradationGet(definition->sun_color, definition->daytime);
if (dist < 0.9)
{
return sun_color;
}
else
{
sun_color.a = (1.0 - dist) / 0.1;
colorMask(&sky_color, &sun_color);
return sky_color;
}
}
else
{
return sky_color;
}
}
static int _postProcessFragment(RenderFragment* fragment, Renderer* renderer, void* data)
{
Vector3 location, direction;
Color result;
SkyDefinition* definition;
definition = (SkyDefinition*)data;
location = fragment->vertex.location;
direction = v3Sub(location, renderer->camera_location);
result = skyGetColor(definition, renderer, renderer->camera_location, v3Normalize(direction));
result = renderer->applyClouds(renderer, result, renderer->camera_location, v3Add(renderer->camera_location, v3Scale(direction, 10.0)));
fragment->vertex.color = result;
return 1;
}
void skyRender(SkyDefinition* definition, Renderer* renderer)
{
int res_i, res_j;
int i, j;
double step_i, step_j;
double current_i, current_j;
Vertex vertex1, vertex2, vertex3, vertex4;
Color col;
Vector3 direction;
res_i = renderer->render_quality * 40;
res_j = renderer->render_quality * 20;
step_i = M_PI * 2.0 / (double)res_i;
step_j = M_PI / (double)res_j;
col.r = 0.0;
col.g = 0.0;
col.a = 1.0;
for (j = 0; j < res_j; j++)
{
if (!renderer->addRenderProgress(renderer, 0.0))
{
return;
}
current_j = (double)(j - res_j / 2) * step_j;
for (i = 0; i < res_i; i++)
{
current_i = (double)i * step_i;
direction.x = SPHERE_SIZE * cos(current_i) * cos(current_j);
direction.y = SPHERE_SIZE * sin(current_j);
direction.z = SPHERE_SIZE * sin(current_i) * cos(current_j);
vertex1.location = v3Add(renderer->camera_location, direction);
col.b = sin(direction.x) * sin(direction.x) * cos(direction.z) * cos(direction.z);
vertex1.color = col;
vertex1.callback = _postProcessFragment;
vertex1.callback_data = definition;
direction.x = SPHERE_SIZE * cos(current_i + step_i) * cos(current_j);
direction.y = SPHERE_SIZE * sin(current_j);
direction.z = SPHERE_SIZE * sin(current_i + step_i) * cos(current_j);
vertex2.location = v3Add(renderer->camera_location, direction);
col.b = sin(direction.x) * sin(direction.x) * cos(direction.z) * cos(direction.z);
vertex2.color = col;
vertex2.callback = _postProcessFragment;
vertex2.callback_data = definition;
direction.x = SPHERE_SIZE * cos(current_i + step_i) * cos(current_j + step_j);
direction.y = SPHERE_SIZE * sin(current_j + step_j);
direction.z = SPHERE_SIZE * sin(current_i + step_i) * cos(current_j + step_j);
vertex3.location = v3Add(renderer->camera_location, direction);
col.b = sin(direction.x) * sin(direction.x) * cos(direction.z) * cos(direction.z);
vertex3.color = col;
vertex3.callback = _postProcessFragment;
vertex3.callback_data = definition;
direction.x = SPHERE_SIZE * cos(current_i) * cos(current_j + step_j);
direction.y = SPHERE_SIZE * sin(current_j + step_j);
direction.z = SPHERE_SIZE * sin(current_i) * cos(current_j + step_j);
vertex4.location = v3Add(renderer->camera_location, direction);
col.b = sin(direction.x) * sin(direction.x) * cos(direction.z) * cos(direction.z);
vertex4.color = col;
vertex4.callback = _postProcessFragment;
vertex4.callback_data = definition;
/* TODO Triangles at poles */
renderer->pushQuad(renderer, &vertex1, &vertex4, &vertex3, &vertex2);
}
}
}
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