/**
* @brief Draw a raindrop
* @details Render a rain particle.
*/
static void CG_RainParticleRender(cg_atmosphericParticle_t *particle)
{
vec3_t forward, right;
polyVert_t verts[3];
vec2_t line;
float len, dist;
vec3_t start, finish;
float groundHeight;
if (particle->active == ACT_NOT)
{
return;
}
if (CG_CullPoint(particle->pos))
{
return;
}
VectorCopy(particle->pos, start);
dist = DistanceSquared(particle->pos, cg.refdef_current->vieworg);
// make sure it doesn't clip through surfaces
groundHeight = BG_GetSkyGroundHeightAtPoint(start);
len = particle->height;
if (start[2] - ATMOSPHERIC_PARTICLE_OFFSET <= groundHeight)
{
// stop rain going through surfaces
len = particle->height - groundHeight + start[2];
VectorMA(start, len - particle->height, particle->deltaNormalized, start);
}
if (len <= 0)
{
return;
}
// fade nearby rain particles
if (dist < Square(128.f))
{
dist = .25f + .75f * (dist / Square(128.f));
}
else
{
dist = 1.0f;
}
VectorCopy(particle->deltaNormalized, forward);
VectorMA(start, -len, forward, finish);
line[0] = DotProduct(forward, cg.refdef_current->viewaxis[1]);
line[1] = DotProduct(forward, cg.refdef_current->viewaxis[2]);
VectorScale(cg.refdef_current->viewaxis[1], line[1], right);
VectorMA(right, -line[0], cg.refdef_current->viewaxis[2], right);
VectorNormalize(right);
VectorCopy(finish, verts[0].xyz);
verts[0].st[0] = 0.5f;
verts[0].st[1] = 0;
verts[0].modulate[0] = particle->colour[0];
verts[0].modulate[1] = particle->colour[1];
verts[0].modulate[2] = particle->colour[2];
verts[0].modulate[3] = 100 * dist;
VectorMA(start, -particle->weight, right, verts[1].xyz);
verts[1].st[0] = 0;
verts[1].st[1] = 1;
verts[1].modulate[0] = particle->colour[0];
verts[1].modulate[1] = particle->colour[1];
verts[2].modulate[2] = particle->colour[2];
verts[1].modulate[3] = 200 * dist;
VectorMA(start, particle->weight, right, verts[2].xyz);
verts[2].st[0] = 1;
verts[2].st[1] = 1;
verts[2].modulate[0] = particle->colour[0];
verts[2].modulate[1] = particle->colour[1];
verts[2].modulate[2] = particle->colour[2];
verts[2].modulate[3] = 200 * dist;
CG_AddPolyToPool(*particle->effectshader, verts);
}
/**
* @brief Draw a snowflake
* @details Render a snow particle.
*/
static void CG_SnowParticleRender(cg_atmosphericParticle_t *particle)
{
vec3_t forward, right;
polyVert_t verts[3];
vec2_t line;
float len, sinTumbling, cosTumbling, particleWidth, dist;
vec3_t start, finish;
float groundHeight;
if (particle->active == ACT_NOT)
{
return;
}
if (CG_CullPoint(particle->pos))
{
return;
}
VectorCopy(particle->pos, start);
sinTumbling = sin(particle->pos[2] * 0.03125f * (0.5f * particle->weight));
cosTumbling = cos((particle->pos[2] + particle->pos[1]) * 0.03125f * (0.5f * particle->weight));
start[0] += 24 * (1 - particle->deltaNormalized[2]) * sinTumbling;
start[1] += 24 * (1 - particle->deltaNormalized[2]) * cosTumbling;
// make sure it doesn't clip through surfaces
groundHeight = BG_GetSkyGroundHeightAtPoint(start);
len = particle->height;
if (start[2] - len - ATMOSPHERIC_PARTICLE_OFFSET <= groundHeight)
{
return;
// stop snow going through surfaces
//len = particle->height - groundHeight + start[2];
//VectorMA(start, len - particle->height, particle->deltaNormalized, start);
}
if (len <= 0)
{
return;
}
line[0] = particle->pos[0] - cg.refdef_current->vieworg[0];
line[1] = particle->pos[1] - cg.refdef_current->vieworg[1];
dist = DistanceSquared(particle->pos, cg.refdef_current->vieworg);
// dist becomes scale
if (dist > Square(500.f))
{
dist = 1.f + ((dist - Square(500.f)) * (10.f / Square(2000.f)));
}
else
{
dist = 1.f;
}
len *= dist;
VectorCopy(particle->deltaNormalized, forward);
VectorMA(start, -(len /* sinTumbling */), forward, finish);
line[0] = DotProduct(forward, cg.refdef_current->viewaxis[1]);
line[1] = DotProduct(forward, cg.refdef_current->viewaxis[2]);
VectorScale(cg.refdef_current->viewaxis[1], line[1], right);
VectorMA(right, -line[0], cg.refdef_current->viewaxis[2], right);
VectorNormalize(right);
particleWidth = dist * (/* cosTumbling */ particle->weight);
VectorMA(finish, -particleWidth, right, verts[0].xyz);
verts[0].st[0] = 0;
verts[0].st[1] = 0;
verts[0].modulate[0] = 255;
verts[0].modulate[1] = 255;
verts[0].modulate[2] = 255;
verts[0].modulate[3] = 255;
VectorMA(start, -particleWidth, right, verts[1].xyz);
verts[1].st[0] = 0;
verts[1].st[1] = 1;
verts[1].modulate[0] = 255;
verts[1].modulate[1] = 255;
verts[1].modulate[2] = 255;
verts[1].modulate[3] = 255;
VectorMA(start, particleWidth, right, verts[2].xyz);
verts[2].st[0] = 1;
verts[2].st[1] = 1;
verts[2].modulate[0] = 255;
verts[2].modulate[1] = 255;
verts[2].modulate[2] = 255;
verts[2].modulate[3] = 255;
CG_AddPolyToPool(*particle->effectshader, verts);
}
static void CG_RainParticleRender( cg_atmosphericParticle_t *particle )
{
// Draw a raindrop
vec3_t forward, right;
polyVert_t verts[3];
vec2_t line;
float len, frac, dist;
vec3_t start, finish;
float groundHeight;
// int msec = trap_Milliseconds();
// n_rendertime++;
if( particle->active == ACT_NOT ) {
// rendertime += trap_Milliseconds() - msec;
return;
}
if( CG_CullPoint( particle->pos ) ) {
return;
}
VectorCopy( particle->pos, start );
dist = DistanceSquared( particle->pos, cg.refdef_current->vieworg );
// Make sure it doesn't clip through surfaces
groundHeight = BG_GetSkyGroundHeightAtPoint( start );
len = particle->height;
if( start[2] <= groundHeight ) {
// Stop snow going through surfaces.
len = particle->height - groundHeight + start[2];
frac = start[2];
VectorMA( start, len - particle->height, particle->deltaNormalized, start );
}
if( len <= 0 ) {
// rendertime += trap_Milliseconds() - msec;
return;
}
// fade nearby rain particles
if( dist < Square( 128.f ) )
dist = .25f + .75f * ( dist / Square( 128.f ) );
else
dist = 1.0f;
VectorCopy( particle->deltaNormalized, forward );
VectorMA( start, -len, forward, finish );
line[0] = DotProduct( forward, cg.refdef_current->viewaxis[1] );
line[1] = DotProduct( forward, cg.refdef_current->viewaxis[2] );
VectorScale( cg.refdef_current->viewaxis[1], line[1], right );
VectorMA( right, -line[0], cg.refdef_current->viewaxis[2], right );
VectorNormalize( right );
// dist = 1.0;
VectorCopy( finish, verts[0].xyz );
verts[0].st[0] = 0.5f;
verts[0].st[1] = 0;
verts[0].modulate[0] = particle->colour[0];
verts[0].modulate[1] = particle->colour[1];
verts[0].modulate[2] = particle->colour[2];
verts[0].modulate[3] = 100 * dist;
VectorMA( start, -particle->weight, right, verts[1].xyz );
verts[1].st[0] = 0;
verts[1].st[1] = 1;
verts[1].modulate[0] = particle->colour[0];
verts[1].modulate[1] = particle->colour[1];
verts[2].modulate[2] = particle->colour[2];
verts[1].modulate[3] = 200 * dist;
VectorMA( start, particle->weight, right, verts[2].xyz );
verts[2].st[0] = 1;
verts[2].st[1] = 1;
verts[2].modulate[0] = particle->colour[0];
verts[2].modulate[1] = particle->colour[1];
verts[2].modulate[2] = particle->colour[2];
verts[2].modulate[3] = 200 * dist;
CG_AddPolyToPool( *particle->effectshader, verts );
// rendertime += trap_Milliseconds() - msec;
}