+++ /dev/null
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <math.h>
-#include <assert.h>
-#include "screen.h"
-#include "demo.h"
-#include "3dgfx.h"
-#include "gfxutil.h"
-#include "util.h"
-#include "metasurf.h"
-#include "mesh.h"
-
-struct metaball {
- float energy;
- float pos[3];
-};
-
-static int init(void);
-static void destroy(void);
-static void start(long trans_time);
-static void draw(void);
-
-static void calc_voxel_field(void);
-
-static struct screen scr = {
- "metaballs",
- init,
- destroy,
- start, 0,
- draw
-};
-
-static float cam_theta, cam_phi = 25;
-static float cam_dist = 10;
-static struct g3d_mesh mmesh;
-
-static struct metasurface *msurf;
-
-#define VOL_SZ 32
-#define VOL_SCALE 10.0f
-#define VOX_DIST (VOL_SCALE / VOL_SZ)
-#define VOL_HALF_SCALE (VOL_SCALE * 0.5f)
-
-#define NUM_MBALLS 3
-static struct metaball mball[NUM_MBALLS];
-
-static int dbg;
-
-struct screen *metaballs_screen(void)
-{
- return &scr;
-}
-
-static int init(void)
-{
- mball[0].energy = 1.2;
- mball[1].energy = 0.8;
- mball[2].energy = 1.0;
-
- if(!(msurf = msurf_create())) {
- fprintf(stderr, "failed to initialize metasurf\n");
- return -1;
- }
- msurf_set_resolution(msurf, VOL_SZ, VOL_SZ, VOL_SZ);
- msurf_set_bounds(msurf, -VOL_HALF_SCALE, -VOL_HALF_SCALE, -VOL_HALF_SCALE,
- VOL_HALF_SCALE, VOL_HALF_SCALE, VOL_HALF_SCALE);
- msurf_set_threshold(msurf, 1.7);
- msurf_set_inside(msurf, MSURF_GREATER);
-
- mmesh.prim = G3D_TRIANGLES;
- mmesh.varr = 0;
- mmesh.iarr = 0;
- mmesh.vcount = mmesh.icount = 0;
-
- return 0;
-}
-
-static void destroy(void)
-{
- msurf_free(msurf);
-}
-
-static void start(long trans_time)
-{
- g3d_matrix_mode(G3D_PROJECTION);
- g3d_load_identity();
- g3d_perspective(50.0, 1.3333333, 0.5, 100.0);
-
- g3d_enable(G3D_CULL_FACE);
- g3d_enable(G3D_LIGHTING);
- g3d_enable(G3D_LIGHT0);
-
- g3d_polygon_mode(G3D_GOURAUD);
-}
-
-static void update(void)
-{
- int i, j;
- float tsec = time_msec / 1000.0f;
- static float phase[] = {0.0, M_PI / 3.0, M_PI * 0.8};
- static float speed[] = {0.8, 1.4, 1.0};
- static float scale[][3] = {{1, 2, 0.8}, {0.5, 1.6, 0.6}, {1.5, 0.7, 0.5}};
- static float offset[][3] = {{0, 0, 0}, {0.25, 0, 0}, {-0.2, 0.15, 0.2}};
-
- mouse_orbit_update(&cam_theta, &cam_phi, &cam_dist);
-
- for(i=0; i<NUM_MBALLS; i++) {
- float t = (tsec + phase[i]) * speed[i];
-
- for(j=0; j<3; j++) {
- float x = sin(t + j * M_PI / 2.0);
- mball[i].pos[j] = offset[i][j] + x * scale[i][j];
- }
- }
-
- calc_voxel_field();
- msurf_polygonize(msurf);
-
- mmesh.vcount = msurf_vertex_count(msurf);
- mmesh.varr = msurf_vertices(msurf);
-}
-
-static void draw(void)
-{
- int i, j;
-
- update();
-
- memset(fb_pixels, 0, fb_width * fb_height * 2);
-
- for(i=0; i<120; i++) {
- for(j=0; j<160; j++) {
- fb_pixels[(i + 60) * 320 + (j + 80)] = 0x1e7;
- }
- }
- g3d_viewport(80, 60, 160, 120);
-
- 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);
-
- g3d_light_pos(0, -10, 10, 20);
-
- zsort_mesh(&mmesh);
-
- g3d_mtl_diffuse(0.6, 0.6, 0.6);
-
- draw_mesh(&mmesh);
-
- g3d_viewport(0, 0, fb_width, fb_height);
-
- swap_buffers(fb_pixels);
-}
-
-static void calc_voxel_field(void)
-{
- int i, j, k, b;
- float *voxptr;
-
- if(!(voxptr = msurf_voxels(msurf))) {
- fprintf(stderr, "failed to allocate voxel field\n");
- abort();
- }
-
- for(i=0; i<VOL_SZ; i++) {
- float z = -VOL_HALF_SCALE + i * VOX_DIST;
-
- for(j=0; j<VOL_SZ; j++) {
- float y = -VOL_HALF_SCALE + j * VOX_DIST;
-
- for(k=0; k<VOL_SZ; k++) {
- float x = -VOL_HALF_SCALE + k * VOX_DIST;
-
- float val = 0.0f;
- for(b=0; b<NUM_MBALLS; b++) {
- float dx = mball[b].pos[0] - x;
- float dy = mball[b].pos[1] - y;
- float dz = mball[b].pos[2] - z;
-
- float lensq = dx * dx + dy * dy + dz * dz;
-
- val += lensq == 0.0f ? 1024.0f : mball[b].energy / lensq;
- }
-
- *voxptr++ = val;
- }
- }
- }
- ++dbg;
-}
projects / dosdemo / blobdiff