paysages3d/lib_paysages/atmosphere/raster.c

76 lines
2.6 KiB
C

#include "public.h"
#include "private.h"
#include <math.h>
#include <stdlib.h>
#include "../tools.h"
#include "../renderer.h"
static Color _postProcessFragment(Renderer* renderer, Vector3 location, void* data)
{
Vector3 direction;
Color result;
UNUSED(data);
direction = v3Sub(location, renderer->camera_location);
/* TODO Don't compute result->color if it's fully covered by clouds */
result = renderer->atmosphere->getSkyColor(renderer, v3Normalize(direction));
result = renderer->applyClouds(renderer, result, renderer->camera_location, v3Add(renderer->camera_location, v3Scale(direction, 10.0)));
return result;
}
void atmosphereRenderSkydome(Renderer* renderer)
{
int res_i, res_j;
int i, j;
double step_i, step_j;
double current_i, current_j;
Vector3 vertex1, vertex2, vertex3, vertex4;
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;
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 = v3Add(renderer->camera_location, direction);
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 = v3Add(renderer->camera_location, direction);
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 = v3Add(renderer->camera_location, direction);
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 = v3Add(renderer->camera_location, direction);
/* TODO Triangles at poles */
renderer->pushQuad(renderer, vertex1, vertex4, vertex3, vertex2, _postProcessFragment, NULL);
}
}
}