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/*
render/dust.cc
This file is part of the Osirion project and is distributed under
the terms of the GNU General Public License version 2
*/
#include "render/camera.h"
#include "render/dust.h"
#include "render/gl.h"
#include "core/cvar.h"
#include "core/core.h"
#include "math/functions.h"
#include "sys/sys.h"
namespace render
{
core::Cvar *r_dust;
core::Cvar *r_dustsize;
const float LOWSPEEDLIMIT = 5.0f;
const float TRAILLENGHT = 0.25f;
const float DUSTMAXALPHA = 0.8f;
const float DUSTDISTANCE = 8.0f;
float *dust = 0;
size_t dustsize = 0;
void Dust::init()
{
r_dust = core::Cvar::get("r_dust", "1", core::Cvar::Archive);
r_dust->set_info("[bool] render dust");
r_dustsize = core::Cvar::get("r_dustsize", "128", core::Cvar::Archive);
r_dustsize->set_info("[int] number of dust particles");
dust = 0;
dustsize = (size_t) r_dustsize->value();
}
void Dust::shutdown()
{
if (dust) {
free(dust);
dust = 0;
dustsize = 0;
}
}
void Dust::reset()
{
if (dust) {
free(dust);
dust = 0;
}
}
void Dust::draw()
{
float alpha = 0.0f;
float traillength = 0.0f;
if (!r_dust->value()) {
if (dust) {
free(dust);
dust = 0;
}
dustsize = 0;
return;
}
if ((size_t) r_dustsize->value() != dustsize) {
con_debug << " changing dust size..." << std::endl;
if (dust) {
free(dust);
dust = 0;
}
dustsize = (size_t) r_dustsize->value();
}
if (dustsize <= 0) {
if (dust) {
free(dust);
dust = 0;
}
dustsize = 0;
return;
}
if (!core::localcontrol()) {
return;
}
if (! core::localcontrol()->speed())
return;
if (!dust) {
con_debug << " generating dust..." << std::endl;
dust = (float *) malloc(sizeof(float) * dustsize* 3);
for (size_t i = 0; i < dustsize; i++) {
dust[i*3] = core::localcontrol()->location().x + (math::randomf(2) - 1) * (DUSTDISTANCE + core::localcontrol()->radius());
dust[i*3+1] = core::localcontrol()->location().y + (math::randomf(2) - 1) * (DUSTDISTANCE + core::localcontrol()->radius());
dust[i*3+2] = core::localcontrol()->location().z + (math::randomf(2) - 1) * (DUSTDISTANCE + core::localcontrol()->radius());
}
}
math::Color color(1.0f, 1.0f);
alpha = core::localcontrol()->speed() / LOWSPEEDLIMIT;
if (alpha > DUSTMAXALPHA)
alpha = DUSTMAXALPHA;
color.a = alpha;
traillength = core::localcontrol()->speed() / LOWSPEEDLIMIT;
if (traillength > 1)
traillength = 1.0f;
traillength *= TRAILLENGHT;
gl::color(color);
gl::begin(gl::Lines);
math::Vector3f v;
for (size_t i = 0; i < dustsize; i++) {
float dsquare = 0;
for (size_t j = 0; j < 3; j++) {
dsquare += (core::localcontrol()->location()[j] - dust[i*3+j]) * (core::localcontrol()->location()[j] - dust[i*3+j]);
v[j] = dust[i*3+j] - core::localcontrol()->state()->axis().forward()[j] * traillength;
}
if (dsquare > (core::localcontrol()->radius() + DUSTDISTANCE)*(core::localcontrol()->radius() + DUSTDISTANCE)) {
for (size_t j = 0; j < 3; j++) {
dust[i*3+j] = core::localcontrol()->location()[j] + (math::randomf(2) - 1) * (DUSTDISTANCE + core::localcontrol()->radius());
v[j] = dust[i*3+j] - core::localcontrol()->state()->axis().forward()[j] * traillength;
}
}
glVertex3fv(&dust[i*3]);
gl::vertex(v);
}
gl::end();
}
}
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