#include "util.h"
#include "gfxutil.h"
#include "timer.h"
+#include "smoketxt.h"
#ifdef MSDOS
#include "dos/gfx.h" /* for wait_vsync assembly macro */
void wait_vsync(void);
#endif
-/* if defined, use bilinear interpolation for dispersion field vectors */
-#define BILERP_FIELD
-/* if defined randomize field vectors by RAND_FIELD_MAX */
-#define RANDOMIZE_FIELD
-
-#define RAND_FIELD_MAX 0.7
-
#define BLUR_RAD 5
-#define PCOUNT 4000
-#define MAX_LIFE 7.0f
-#define PALPHA 1.0f
-#define ZBIAS 0.25
-#define DRAG 0.95
-#define FORCE 0.07
-#define FREQ 0.085
-static float wind[] = {-0.0, 0.0, 0.01};
-
-
-struct vec2 {
- float x, y;
-};
-
-struct vec3 {
- float x, y, z;
-};
-
-struct particle {
- float x, y, z;
- float vx, vy, vz; /* velocity */
- int r, g, b;
- float life;
-};
-
-struct emitter {
- struct particle *plist;
- int pcount;
-};
-
-struct vfield {
- struct vec2 pos, size;
-
- int width, height;
- int xshift;
- struct vec2 *v;
-};
-
static int init(void);
static void destroy(void);
static void start(long trans_time);
static void draw(void);
-int init_emitter(struct emitter *em, int num, unsigned char *map, int xsz, int ysz);
-void update_particles(struct emitter *em, float dt);
-void draw_particles(struct emitter *em);
-
-int init_vfield_load(struct vfield *vf, const char *fname);
-void vfield_eval(struct vfield *vf, float x, float y, struct vec2 *dir);
-
static struct screen scr = {
"greets",
draw
};
-static struct emitter em;
-static struct vfield vfield;
-static struct g3d_vertex *varr;
static long start_time;
+static struct smktxt *stx;
+
static uint16_t *cur_smokebuf, *prev_smokebuf;
static int smokebuf_size;
#define smokebuf_start (cur_smokebuf < prev_smokebuf ? cur_smokebuf : prev_smokebuf)
static int init(void)
{
- int xsz, ysz;
- unsigned char *pixels;
-
- if(!(pixels = img_load_pixels("data/greets1.png", &xsz, &ysz, IMG_FMT_GREY8))) {
- fprintf(stderr, "failed to load particle spawn map\n");
- return -1;
- }
-
- init_emitter(&em, PCOUNT, pixels, xsz, ysz);
- img_free_pixels(pixels);
-
- if(!(varr = malloc(PCOUNT * sizeof *varr))) {
- perror("failed to allocate particle vertex buffer\n");
- return -1;
- }
-
- if(init_vfield_load(&vfield, "data/vfield1") == -1) {
+ if(!(stx = create_smktxt("data/greets1.png", "data/vfield1"))) {
return -1;
}
static void destroy(void)
{
- free(varr);
- free(vfield.v);
free(smokebuf_start);
+ destroy_smktxt(stx);
}
static void start(long trans_time)
prev_my = mouse_y;
prev_bmask = mouse_bmask;
- update_particles(&em, dt);
+ update_smktxt(stx, dt);
}
static void draw(void)
memcpy(cur_smokebuf, prev_smokebuf, smokebuf_size);
g3d_framebuffer(fb_width, fb_height, cur_smokebuf);
- draw_particles(&em);
+ draw_smktxt(stx);
g3d_framebuffer(fb_width, fb_height, fb_pixels);
dest = fb_pixels;
swap_buffers(fb_pixels);
last_swap = get_msec();
}
-
-
-
-int init_emitter(struct emitter *em, int num, unsigned char *map, int xsz, int ysz)
-{
- int i, x, y;
- float aspect = (float)xsz / (float)ysz;
- struct particle *p;
-
- if(!(em->plist = malloc(num * sizeof *em->plist))) {
- return -1;
- }
- em->pcount = num;
-
- p = em->plist;
- for(i=0; i<num; i++) {
- do {
- x = rand() % xsz;
- y = rand() % ysz;
- } while(map[y * xsz + x] < 128);
-
- p->x = (float)x / (float)xsz - 0.5;
- p->y = -(float)y / (float)xsz + 0.5 / aspect;
- p->z = ((float)i / (float)num * 2.0 - 1.0) * 0.005;
- p->r = p->g = p->b = 255;
- p->vx = p->vy = p->vz = 0.0f;
- p->life = MAX_LIFE;
- ++p;
- }
- return 0;
-}
-
-void update_particles(struct emitter *em, float dt)
-{
- int i;
- struct vec2 accel;
- struct particle *p = em->plist;
- struct g3d_vertex *v = varr;
-
- for(i=0; i<em->pcount; i++) {
- vfield_eval(&vfield, p->x, p->y, &accel);
- p->x += p->vx * DRAG * dt;
- p->y += p->vy * DRAG * dt;
- p->z += p->vz * DRAG * dt;
- p->vx += (wind[0] + accel.x * FORCE) * dt;
- p->vy += (wind[1] + accel.y * FORCE) * dt;
- p->vz += (wind[2] + p->z * ZBIAS) * dt;
- p->life -= dt;
- if(p->life < 0.0f) p->life = 0.0f;
-
- v->x = p->x;
- v->y = p->y;
- v->z = p->z;
- v->w = 1.0f;
- v->a = cround64(p->life * 255.0 / MAX_LIFE);
- v->r = 0;
- v->g = (v->a & 0xe0) >> 3;
- v->b = (v->a & 0x1f) << 3;
- ++v;
-
- ++p;
- }
-}
-
-void draw_particles(struct emitter *em)
-{
- g3d_draw(G3D_POINTS, varr, PCOUNT);
-}
-
-
-int init_vfield_load(struct vfield *vf, const char *fname)
-{
- FILE *fp;
- int tmp;
-
- if(!(fp = fopen(fname, "rb"))) {
- fprintf(stderr, "failed to open vector field: %s\n", fname);
- return -1;
- }
- if(fread(&vf->width, sizeof vf->width, 1, fp) < 1 ||
- fread(&vf->height, sizeof vf->height, 1, fp) < 1) {
- fprintf(stderr, "init_vfield_load: unexpected end of file while reading header\n");
- fclose(fp);
- return -1;
- }
-
- /* assume xsz is pow2 otherwise fuck you */
- tmp = vf->width - 1;
- vf->xshift = 0;
- while(tmp) {
- ++vf->xshift;
- tmp >>= 1;
- }
-
- if(!(vf->v = malloc(vf->width * vf->height * sizeof *vf->v))) {
- fprintf(stderr, "failed to allocate %dx%d vector field\n", vf->width, vf->height);
- fclose(fp);
- return -1;
- }
- if(fread(vf->v, sizeof *vf->v, vf->width * vf->height, fp) < vf->width * vf->height) {
- fprintf(stderr, "init_vfield_load: unexpected end of file while reading %dx%d vector field\n",
- vf->width, vf->height);
- fclose(fp);
- return -1;
- }
- fclose(fp);
-
- vf->pos.x = vf->pos.y = 0;
- vf->size.x = vf->size.y = 1;
- return 0;
-}
-
-void vfield_eval(struct vfield *vf, float x, float y, struct vec2 *dir)
-{
- int px, py;
- float tx, ty;
- struct vec2 *p1, *p2;
- struct vec2 left, right;
-
- x = ((x - vf->pos.x) / vf->size.x + 0.5f) * vf->width;
- y = ((y - vf->pos.y) / vf->size.y + 0.5f) * vf->height;
- x = floor(x);
- y = floor(y);
-
- if(x < 0) x = 0;
- if(y < 0) y = 0;
- if(x > vf->width - 2) x = vf->width - 2;
- if(y > vf->height - 2) y = vf->height - 2;
-
- px = (int)x;
- py = (int)y;
-
- p1 = vf->v + (py << vf->xshift) + px;
-#ifdef BILERP_FIELD
- p2 = p1 + vf->width;
-
- tx = fmod(x, 1.0f);
- ty = fmod(y, 1.0f);
-
- left.x = p1->x + (p2->x - p1->x) * ty;
- left.y = p1->y + (p2->y - p1->y) * ty;
- ++p1;
- ++p2;
- right.x = p1->x + (p2->x - p1->x) * ty;
- right.y = p1->y + (p2->y - p1->y) * ty;
-
- dir->x = left.x + (right.x - left.x) * tx;
- dir->y = left.y + (right.y - left.y) * ty;
-#else
- dir->x = p1->x;
- dir->y = p1->y;
-#endif
-
-#ifdef RANDOMIZE_FIELD
- dir->x += ((float)rand() / RAND_MAX - 0.5) * RAND_FIELD_MAX;
- dir->y += ((float)rand() / RAND_MAX - 0.5) * RAND_FIELD_MAX;
-#endif
-}
projects / dosdemo / blobdiff