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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include "SmokeTrailProjectile.h"
#include "Game/Camera.h"
#include "Map/Ground.h"
#include "Rendering/GlobalRendering.h"
#include "Rendering/Env/Particles/ProjectileDrawer.h"
#include "Rendering/GL/VertexArray.h"
#include "Rendering/Textures/TextureAtlas.h"
#include "Sim/Projectiles/ProjectileMemPool.h"
#include "System/myMath.h"
CR_BIND_DERIVED_POOL(CSmokeTrailProjectile, CProjectile, , projMemPool.alloc, projMemPool.free)
CR_REG_METADATA(CSmokeTrailProjectile,(
CR_MEMBER(pos1),
CR_MEMBER(pos2),
CR_MEMBER(orgSize),
CR_MEMBER(creationTime),
CR_MEMBER(lifeTime),
CR_MEMBER(color),
CR_MEMBER(dir1),
CR_MEMBER(dir2),
CR_MEMBER(dirpos1),
CR_MEMBER(dirpos2),
CR_MEMBER(midpos),
CR_MEMBER(middir),
CR_MEMBER(drawSegmented),
CR_MEMBER(firstSegment),
CR_MEMBER(lastSegment),
CR_MEMBER(texture)
))
CSmokeTrailProjectile::CSmokeTrailProjectile(
const CUnit* owner,
const float3& pos1,
const float3& pos2,
const float3& dir1,
const float3& dir2,
bool firstSegment,
bool lastSegment,
float size,
int time,
float color,
AtlasedTexture* texture
):
CProjectile((pos1 + pos2) * 0.5f, ZeroVector, owner, false, false, false),
pos1(pos1),
pos2(pos2),
orgSize(size),
creationTime(gs->frameNum),
lifeTime(time),
color(color),
dir1(dir1),
dir2(dir2),
drawSegmented(false),
firstSegment(firstSegment),
lastSegment(lastSegment),
texture((texture == nullptr)? projectileDrawer->smoketrailtex : texture)
{
checkCol = false;
castShadow = true;
UpdateEndPos(pos1, dir1);
SetRadiusAndHeight(pos1.distance(pos2), 0.0f);
useAirLos |= ((pos.y - CGround::GetApproximateHeight(pos.x, pos.z)) > 10.0f);
}
void CSmokeTrailProjectile::UpdateEndPos(const float3 pos, const float3 dir)
{
pos1 = pos;
dir1 = dir;
const float dist = pos1.distance(pos2);
drawSegmented = false;
SetPosition((pos1 + pos2) * 0.5f);
SetRadiusAndHeight(dist, 0.0f);
sortDistOffset = 10.f + dist * 0.5f; // so that missile's engine flame gets rendered above the trail
if (dir1.dot(dir2) < 0.98f) {
dirpos1 = pos1 - dir1 * dist * 0.33f;
dirpos2 = pos2 + dir2 * dist * 0.33f;
midpos = CalcBeizer(0.5f, pos1, dirpos1, dirpos2, pos2);
middir = (dir1 + dir2).ANormalize();
drawSegmented = true;
}
}
void CSmokeTrailProjectile::Draw(CVertexArray* va)
{
const float age = gs->frameNum + globalRendering->timeOffset - creationTime;
const float invLifeTime = (1.0f / lifeTime);
va->EnlargeArrays(8, 0, VA_SIZE_TC);
const float3 dif1 = (pos1 - camera->GetPos()).ANormalize();
const float3 dif2 = (pos2 - camera->GetPos()).ANormalize();
const float3 odir1 = (dif1.cross(dir1)).ANormalize();
const float3 odir2 = (dif2.cross(dir2)).ANormalize();
const SColor colBase(color, color, color, 1.f);
float a1 = (1.f - age * invLifeTime) * (0.7f + std::fabs(dif1.dot(dir1)));
if (lastSegment) {
a1 = 0;
}
const float alpha1 = Clamp(a1, 0.f, 1.f);
const SColor col = colBase * alpha1;
float a2 = (1.f - (age + 8) * invLifeTime) * (0.7f + std::fabs(dif2.dot(dir2)));
if (firstSegment) {
a2 = 0;
}
const float alpha2 = Clamp(a2, 0.f, 1.f);
const SColor col2 = colBase * alpha2;
const float size = 1 + ( age * invLifeTime) * orgSize;
const float size2 = 1 + ((age + 8) * invLifeTime) * orgSize;
if (drawSegmented) {
const float t = (age + 4) * invLifeTime;
const float3 dif3 = (midpos - camera->GetPos()).ANormalize();
const float3 odir3 = (dif3.cross(middir)).ANormalize();
const float size3 = (0.2f + t) * orgSize;
const float a2 = (1.f - t) * (0.7f + std::fabs(dif3.dot(middir)));
const float alpha = Clamp(a2, 0.f, 1.f);
const SColor col3 = colBase * alpha;
const float midtexx = mix(texture->xstart, texture->xend, 0.5f);
va->AddVertexQTC(pos1 - (odir1 * size), texture->xstart, texture->ystart, col);
va->AddVertexQTC(pos1 + (odir1 * size), texture->xstart, texture->yend, col);
va->AddVertexQTC(midpos + (odir3 * size3), midtexx, texture->yend, col3);
va->AddVertexQTC(midpos - (odir3 * size3), midtexx, texture->ystart, col3);
va->AddVertexQTC(midpos - (odir3 * size3), midtexx, texture->ystart, col3);
va->AddVertexQTC(midpos + (odir3 * size3), midtexx, texture->yend, col3);
va->AddVertexQTC(pos2 + (odir2 * size2), texture->xend, texture->yend, col2);
va->AddVertexQTC(pos2 - (odir2 * size2), texture->xend, texture->ystart, col2);
} else {
va->AddVertexQTC(pos1 - (odir1 * size), texture->xstart, texture->ystart, col);
va->AddVertexQTC(pos1 + (odir1 * size), texture->xstart, texture->yend, col);
va->AddVertexQTC(pos2 + (odir2 * size2), texture->xend, texture->yend, col2);
va->AddVertexQTC(pos2 - (odir2 * size2), texture->xend, texture->ystart, col2);
}
}
void CSmokeTrailProjectile::Update()
{
deleteMe |= (gs->frameNum >= (creationTime + lifeTime));
}
int CSmokeTrailProjectile::GetProjectilesCount() const
{
return 2;
}
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