+++ /dev/null
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <float.h>
-#include "demo.h"
-#include "3dgfx.h"
-#include "vmath.h"
-#include "screen.h"
-#include "util.h"
-#include "cfgopt.h"
-#include "mesh.h"
-
-
-#ifdef MSDOS
-#include "dos/gfx.h" /* for wait_vsync assembly macro */
-#else
-void wait_vsync(void);
-#endif
-
-#define NSPAWNPOS 64
-#define SPAWN_RATE 16.0f
-//#define GRAV (-6.0f)
-#define GRAV 0.0f
-#define HAIR_LENGTH 20
-
-struct particle {
- vec3_t pos;
- vec3_t vel;
- int r, g, b, a;
- int life;
-
- struct particle *next;
-};
-
-struct hairball {
- vec3_t pos;
- quat_t rot;
- float xform[16];
-
- struct particle *plist[NSPAWNPOS];
-};
-
-static int init(void);
-static void destroy(void);
-static void start(long trans_time);
-static void draw(void);
-static void update_hairball(struct hairball *hb, float dt);
-static void draw_hairball(struct hairball *hb);
-
-static struct particle *palloc(void);
-void pfree(struct particle *p);
-
-
-static struct screen scr = {
- "hairball",
- init,
- destroy,
- start, 0,
- draw
-};
-
-static long start_time;
-
-static float cam_theta, cam_phi = 15;
-static float cam_dist = 8;
-
-static vec3_t *spawnpos, *spawndir;
-static struct hairball hball;
-static struct g3d_mesh sphmesh;
-
-struct screen *hairball_screen(void)
-{
- return &scr;
-}
-
-static int init(void)
-{
- int i, j, numpt = 0;
-
- gen_sphere_mesh(&sphmesh, 1.0f, 12, 6);
-
- hball.xform[0] = hball.xform[5] = hball.xform[10] = hball.xform[15] = 1.0f;
- hball.rot.w = 1.0f;
-
- if(!(spawnpos = malloc(NSPAWNPOS * sizeof *spawnpos)) ||
- !(spawndir = malloc(NSPAWNPOS * sizeof *spawndir))) {
- fprintf(stderr, "failed to allocate spawnpos/dir array\n");
- return -1;
- }
-
- while(numpt < NSPAWNPOS) {
- float best_dist = -1.0f;
- for(i=0; i<100; i++) {
- vec3_t pos = sphrand(1.0f);
-
- float mindist = FLT_MAX;
- for(j=0; j<numpt; j++) {
- float dx = pos.x - spawnpos[i].x;
- float dy = pos.y - spawnpos[i].y;
- float dz = pos.z - spawnpos[i].z;
- float dsq = dx * dx + dy * dy + dz * dz;
- if(dsq < mindist) {
- mindist = dsq;
- }
- }
-
- if(mindist > best_dist) {
- spawnpos[numpt] = pos;
- best_dist = mindist;
- }
- }
-
- spawndir[numpt] = spawnpos[numpt];
- ++numpt;
- }
-
- return 0;
-}
-
-static void destroy(void)
-{
-}
-
-static void start(long trans_time)
-{
- g3d_matrix_mode(G3D_PROJECTION);
- g3d_load_identity();
- g3d_perspective(50.0, 1.33333, 0.5, 100.0);
-
- start_time = time_msec;
-}
-
-static void update(void)
-{
- static float prev_mx, prev_my;
- static long prev_msec;
- int mouse_dx, mouse_dy;
- long msec = time_msec - start_time;
- float dt = (msec - prev_msec) / 1000.0f;
- prev_msec = msec;
-
- mouse_dx = mouse_x - prev_mx;
- mouse_dy = mouse_y - prev_my;
- prev_mx = mouse_x;
- prev_my = mouse_y;
-
-
- if(opt.sball) {
- memcpy(hball.xform, sball_matrix, 16 * sizeof(float));
-
- hball.pos.x = hball.xform[12];
- hball.pos.y = hball.xform[13];
- hball.pos.z = hball.xform[14];
- } else {
- if(mouse_bmask & MOUSE_BN_MIDDLE) {
- hball.pos.x += mouse_dx * 0.05;
- hball.pos.y -= mouse_dy * 0.05;
- }
-
- quat_to_mat(hball.xform, hball.rot);
- hball.xform[12] = hball.pos.x;
- hball.xform[13] = hball.pos.y;
- hball.xform[14] = hball.pos.z;
- }
-
- update_hairball(&hball, dt);
-
- mouse_orbit_update(&cam_theta, &cam_phi, &cam_dist);
-}
-
-static void draw(void)
-{
- unsigned long msec;
- static unsigned long last_swap;
-
- update();
-
- memset(fb_pixels, 0, fb_width * fb_height * 2);
-
- g3d_matrix_mode(G3D_MODELVIEW);
- g3d_load_identity();
- g3d_translate(0, 0, -cam_dist);
- g3d_rotate(cam_phi, 1, 0, 0);
- g3d_rotate(cam_theta, 0, 1, 0);
-
- draw_hairball(&hball);
-
- msec = get_msec();
- if(msec - last_swap < 16) {
- wait_vsync();
- }
- if(!opt.vsync) {
- wait_vsync();
- }
- swap_buffers(fb_pixels);
- last_swap = get_msec();
-}
-
-static void update_hairball(struct hairball *hb, float dt)
-{
- int i, j, spawn_count;
- struct particle pdummy, *prev, *p;
- static float spawn_acc;
-
- /* update particles */
- for(i=0; i<NSPAWNPOS; i++) {
- pdummy.next = hb->plist[i];
- prev = &pdummy;
- while(prev && prev->next) {
- p = prev->next;
- if(--p->life <= 0) {
- prev->next = p->next;
- pfree(p);
- prev = prev->next;
- continue;
- }
-
- p->pos.x += p->vel.x * dt;
- p->pos.y += p->vel.y * dt;
- p->pos.z += p->vel.z * dt;
- p->vel.y += GRAV * dt;
-
- p->r = p->g = p->b = (p->life << 8) / HAIR_LENGTH - 1;
-
- prev = p;
- }
-
- hb->plist[i] = pdummy.next;
- }
-
- /* spawn new particles */
- spawn_acc += dt;
- if(spawn_acc >= (1.0f / SPAWN_RATE)) {
- for(i=0; i<NSPAWNPOS; i++) {
- struct particle *p = palloc();
- float *mat = hb->xform;
- vec3_t pos = spawnpos[i];
- vec3_t dir = spawndir[i];
-
- p->pos.x = mat[0] * pos.x + mat[4] * pos.y + mat[8] * pos.z + mat[12];
- p->pos.y = mat[1] * pos.x + mat[5] * pos.y + mat[9] * pos.z + mat[13];
- p->pos.z = mat[2] * pos.x + mat[6] * pos.y + mat[10] * pos.z + mat[14];
-
- p->vel.x = mat[0] * dir.x + mat[4] * dir.y + mat[8] * dir.z;
- p->vel.y = mat[1] * dir.x + mat[5] * dir.y + mat[9] * dir.z;
- p->vel.z = mat[2] * dir.x + mat[6] * dir.y + mat[10] * dir.z;
- p->life = HAIR_LENGTH;
-
- p->next = hb->plist[i];
- hb->plist[i] = p;
- }
- spawn_acc -= 1.0f / SPAWN_RATE;
- }
-}
-
-static void draw_hairball(struct hairball *hb)
-{
- int i, col;
- struct particle *p;
- vec3_t prevpos;
- vec3_t start[NSPAWNPOS];
-
- for(i=0; i<NSPAWNPOS; i++) {
- start[i].x = hb->xform[0] * spawnpos[i].x + hb->xform[4] * spawnpos[i].y + hb->xform[8] * spawnpos[i].z + hb->xform[12];
- start[i].y = hb->xform[1] * spawnpos[i].x + hb->xform[5] * spawnpos[i].y + hb->xform[9] * spawnpos[i].z + hb->xform[13];
- start[i].z = hb->xform[2] * spawnpos[i].x + hb->xform[6] * spawnpos[i].y + hb->xform[10] * spawnpos[i].z + hb->xform[14];
- }
-
- g3d_begin(G3D_LINES);
- for(i=0; i<NSPAWNPOS; i++) {
- if(start[i].z >= hb->pos.z) continue;
- p = hb->plist[i];
- prevpos = start[i];
- while(p) {
- g3d_color3b(p->r, p->g, p->b);
- g3d_vertex(prevpos.x, prevpos.y, prevpos.z);
- g3d_vertex(p->pos.x, p->pos.y, p->pos.z);
- prevpos = p->pos;
- p = p->next;
- }
- }
- g3d_end();
-
-
- g3d_push_matrix();
- g3d_mult_matrix(hb->xform);
- zsort_mesh(&sphmesh);
- draw_mesh(&sphmesh);
- g3d_pop_matrix();
-
- g3d_begin(G3D_LINES);
- for(i=0; i<NSPAWNPOS; i++) {
- if(start[i].z < hb->pos.z) continue;
- p = hb->plist[i];
- prevpos = start[i];
- while(p) {
- g3d_color3b(p->r, p->g, p->b);
- g3d_vertex(prevpos.x, prevpos.y, prevpos.z);
- g3d_vertex(p->pos.x, p->pos.y, p->pos.z);
- prevpos = p->pos;
- p = p->next;
- }
- }
- g3d_end();
-
-}
-
-
-static struct particle *palloc(void)
-{
- return malloc(sizeof(struct particle));
-}
-
-void pfree(struct particle *p)
-{
- free(p);
-}
projects / dosdemo / blobdiff