ref: d9e95d51727004924d5c5cd495a53fd286543377
dir: /d_part.c/
#include "quakedef.h" extern double d_pix_scale; void D_DrawParticle (particle_t *pparticle) { vec3_t local, transformed; double zi; pixel_t *pdest, color; uzint *pz; int i, izi, pix, count, u, v; // transform point VectorSubtract(pparticle->org, r_origin, local); transformed[0] = DotProduct(local, r_pright); transformed[1] = DotProduct(local, r_pup); transformed[2] = DotProduct(local, r_ppn); if(transformed[2] < PARTICLE_Z_CLIP) return; // project the point // FIXME: preadjust xcenter and ycenter zi = 1.0 / transformed[2]; u = xcenter + zi * transformed[0] + 0.5; v = ycenter - zi * transformed[1] + 0.5; if ((v > d_vrectbottom_particle) || (u > d_vrectright_particle) || (v < d_vrecty) || (u < d_vrectx)) { return; } pz = d_pzbuffer + d_zwidth*v + u; pdest = d_viewbuffer + d_scantable[v] + u; izi = zi * 0x8000 * 0x10000; zi = 1024.0 * d_pix_scale / Length(local); pix = clamp(zi, d_pix_min, d_pix_max) * r_part_scale.value; if(pix < 1) pix = 1; color = pparticle->color; for(count = pix; count; count--, pz += d_zwidth, pdest += screenwidth){ for(i = 0; i < pix; i++){ if(pz[i] <= izi){ pz[i] = izi; pdest[i] = color; } } } }