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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/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;
size_t dustsize;
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) {
delete dust;
dust = 0;
dustsize = 0;
}
}
void Dust::reset()
{
delete dust;
dust = 0;
}
void Dust::draw()
{
if (!r_dust->value()) {
if (dust) {
delete dust;
dust = 0;
}
return;
}
if (!core::localcontrol()) {
return;
}
if ((size_t) r_dustsize->value() != dustsize) {
con_debug << " changing dust size..." << std::endl;
if (dust) {
delete dust;
dust = 0;
}
}
dustsize = (size_t) r_dustsize->value();
if (!dustsize) {
if (dust) {
delete dust;
dust = 0;
}
return;
}
if (!dust) {
con_debug << " generating dust..." << std::endl;
dust = new 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());
}
}
if (!core::localcontrol()->speed())
return;
math::Color color;
if (core::localcontrol()->speed() < LOWSPEEDLIMIT) {
color.a = core::localcontrol()->speed() / LOWSPEEDLIMIT;
}
color.a *= DUSTMAXALPHA;
gl::color(color);
gl::begin(gl::Lines);
math::Vector3f v;
for (size_t i = 0; i < dustsize; i++) {
v.assign(core::localcontrol()->location());
for (size_t j = 0; j < 3; j++)
v[j] -= dust[i*3+j];
if (v.lengthsquared() > (core::localcontrol()->radius() + DUSTDISTANCE)*(core::localcontrol()->radius() + DUSTDISTANCE)) {
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());
}
glVertex3fv(dust+3*i);
for (size_t j = 0; j < 3; j++)
v[j] = dust[i*3+j];
v -= core::localcontrol()->state()->axis().forward() * color.a * TRAILLENGHT;
gl::vertex(v);
}
gl::end();
}
}
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