12 struct g3d_vertex *varr;
17 static int init(void);
18 static void destroy(void);
19 static void start(long trans_time);
20 static void draw(void);
21 static void draw_mesh(struct mesh *mesh);
22 static int gen_cube(struct mesh *mesh, float sz);
23 static int gen_torus(struct mesh *mesh, float rad, float ringrad, int usub, int vsub);
24 static void zsort(struct mesh *m);
25 static void draw_lowres_raster(void);
27 static struct screen scr = {
35 static float theta, phi = 25;
36 static struct mesh cube, torus;
38 #define LOWRES_SCALE 10
39 static uint16_t *lowres_pixels;
40 static int lowres_width, lowres_height;
42 struct screen *polytest_screen(void)
50 gen_torus(&torus, 1.0, 0.25, 24, 12);
52 lowres_width = fb_width / LOWRES_SCALE;
53 lowres_height = fb_height / LOWRES_SCALE;
54 lowres_pixels = malloc(lowres_width * lowres_height * 2);
59 static void destroy(void)
67 static void start(long trans_time)
69 g3d_matrix_mode(G3D_PROJECTION);
71 g3d_perspective(50.0, 1.3333333, 0.5, 100.0);
73 g3d_enable(G3D_CULL_FACE);
76 static void update(void)
78 static int prev_mx, prev_my;
79 static unsigned int prev_bmask;
82 if(mouse_bmask ^ prev_bmask == 0) {
83 int dx = mouse_x - prev_mx;
84 int dy = mouse_y - prev_my;
90 if(phi < -90) phi = -90;
91 if(phi > 90) phi = 90;
97 prev_bmask = mouse_bmask;
100 static void draw(void)
104 memset(lowres_pixels, 0, lowres_width * lowres_height * 2);
106 g3d_matrix_mode(G3D_MODELVIEW);
108 g3d_translate(0, 0, -3);
109 g3d_rotate(phi, 1, 0, 0);
110 g3d_rotate(theta, 0, 1, 0);
112 g3d_framebuffer(lowres_width, lowres_height, lowres_pixels);
116 draw_lowres_raster();
119 g3d_framebuffer(fb_width, fb_height, fb_pixels);
121 g3d_polygon_mode(G3D_WIRE);
123 g3d_polygon_mode(G3D_FLAT);
125 swap_buffers(fb_pixels);
128 static void draw_mesh(struct mesh *mesh)
131 g3d_draw_indexed(mesh->prim, mesh->varr, mesh->vcount, mesh->iarr, mesh->icount);
133 g3d_draw(mesh->prim, mesh->varr, mesh->vcount);
137 #define NORMAL(vp, x, y, z) do { vp->nx = x; vp->ny = y; vp->nz = z; } while(0)
138 #define COLOR(vp, cr, cg, cb) do { vp->r = cr; vp->g = cg; vp->b = cb; } while(0)
139 #define TEXCOORD(vp, tu, tv) do { vp->u = tu; vp->v = tv; } while(0)
140 #define VERTEX(vp, vx, vy, vz) \
142 vp->x = vx; vp->y = vy; vp->z = vz; vp->w = 1.0f; \
146 static int gen_cube(struct mesh *mesh, float sz)
148 struct g3d_vertex *vptr;
149 float hsz = sz / 2.0;
151 mesh->prim = G3D_QUADS;
156 if(!(mesh->varr = malloc(mesh->vcount * sizeof *mesh->varr))) {
162 NORMAL(vptr, 0, 0, -1);
163 COLOR(vptr, 255, 0, 255);
164 VERTEX(vptr, hsz, -hsz, -hsz);
165 VERTEX(vptr, -hsz, -hsz, -hsz);
166 VERTEX(vptr, -hsz, hsz, -hsz);
167 VERTEX(vptr, hsz, hsz, -hsz);
169 NORMAL(vptr, 0, -1, 0);
170 COLOR(vptr, 0, 255, 255);
171 VERTEX(vptr, -hsz, -hsz, -hsz);
172 VERTEX(vptr, hsz, -hsz, -hsz);
173 VERTEX(vptr, hsz, -hsz, hsz);
174 VERTEX(vptr, -hsz, -hsz, hsz);
176 NORMAL(vptr, -1, 0, 0);
177 COLOR(vptr, 255, 255, 0);
178 VERTEX(vptr, -hsz, -hsz, -hsz);
179 VERTEX(vptr, -hsz, -hsz, hsz);
180 VERTEX(vptr, -hsz, hsz, hsz);
181 VERTEX(vptr, -hsz, hsz, -hsz);
183 NORMAL(vptr, 1, 0, 0);
184 COLOR(vptr, 255, 0, 0);
185 VERTEX(vptr, hsz, -hsz, hsz);
186 VERTEX(vptr, hsz, -hsz, -hsz);
187 VERTEX(vptr, hsz, hsz, -hsz);
188 VERTEX(vptr, hsz, hsz, hsz);
190 NORMAL(vptr, 0, 1, 0);
191 COLOR(vptr, 0, 255, 0);
192 VERTEX(vptr, -hsz, hsz, hsz);
193 VERTEX(vptr, hsz, hsz, hsz);
194 VERTEX(vptr, hsz, hsz, -hsz);
195 VERTEX(vptr, -hsz, hsz, -hsz);
197 NORMAL(vptr, 0, 0, 1);
198 COLOR(vptr, 0, 0, 255);
199 VERTEX(vptr, -hsz, -hsz, hsz);
200 VERTEX(vptr, hsz, -hsz, hsz);
201 VERTEX(vptr, hsz, hsz, hsz);
202 VERTEX(vptr, -hsz, hsz, hsz);
207 static void torusvec(float *res, float theta, float phi, float mr, float rr)
212 rx = -cos(phi) * rr + mr;
216 res[0] = rx * sin(theta) + rz * cos(theta);
218 res[2] = -rx * cos(theta) + rz * sin(theta);
221 static int gen_torus(struct mesh *mesh, float rad, float ringrad, int usub, int vsub)
224 int nfaces, uverts, vverts;
225 struct g3d_vertex *vptr;
228 mesh->prim = G3D_QUADS;
230 if(usub < 4) usub = 4;
231 if(vsub < 2) vsub = 2;
236 mesh->vcount = uverts * vverts;
237 nfaces = usub * vsub;
238 mesh->icount = nfaces * 4;
240 if(!(mesh->varr = malloc(mesh->vcount * sizeof *mesh->varr))) {
243 if(!(mesh->iarr = malloc(mesh->icount * sizeof *mesh->iarr))) {
249 for(i=0; i<uverts; i++) {
250 float u = (float)i / (float)(uverts - 1);
251 float theta = u * 2.0 * M_PI;
254 torusvec(rcent, theta, 0, rad, 0);
256 for(j=0; j<vverts; j++) {
257 float v = (float)j / (float)(vverts - 1);
258 float phi = v * 2.0 * M_PI;
259 int chess = (i & 1) == (j & 1);
261 torusvec(&vptr->x, theta, phi, rad, ringrad);
263 vptr->nx = (vptr->x - rcent[0]) / ringrad;
264 vptr->ny = (vptr->y - rcent[1]) / ringrad;
265 vptr->nz = (vptr->z - rcent[2]) / ringrad;
268 vptr->r = chess ? 255 : 64;
270 vptr->b = chess ? 64 : 255;
273 if(i < usub && j < vsub) {
274 int idx = i * vverts + j;
277 *iptr++ = idx + vverts + 1;
278 *iptr++ = idx + vverts;
287 struct g3d_vertex *varr;
291 static int zsort_cmp(const void *aptr, const void *bptr)
293 const int16_t *a = (const int16_t*)aptr;
294 const int16_t *b = (const int16_t*)bptr;
296 const float *m = zsort_cls.xform;
298 const struct g3d_vertex *va = zsort_cls.varr + a[0];
299 const struct g3d_vertex *vb = zsort_cls.varr + b[0];
301 float za = m[2] * va->x + m[6] * va->y + m[10] * va->z + m[14];
302 float zb = m[2] * vb->x + m[6] * vb->y + m[10] * vb->z + m[14];
304 va = zsort_cls.varr + a[2];
305 vb = zsort_cls.varr + b[2];
307 za += m[2] * va->x + m[6] * va->y + m[10] * va->z + m[14];
308 zb += m[2] * vb->x + m[6] * vb->y + m[10] * vb->z + m[14];
313 static void zsort(struct mesh *m)
315 int nfaces = m->icount / m->prim;
317 zsort_cls.varr = m->varr;
318 zsort_cls.xform = g3d_get_matrix(G3D_MODELVIEW, 0);
320 qsort(m->iarr, nfaces, m->prim * sizeof *m->iarr, zsort_cmp);
323 static void draw_huge_pixel(uint16_t *dest, int dest_width, uint16_t color)
326 uint16_t grid_color = PACK_RGB16(127, 127, 127);
328 for(i=0; i<LOWRES_SCALE; i++) {
329 for(j=0; j<LOWRES_SCALE; j++) {
330 dest[j] = i == 0 || j == 0 ? grid_color : color;
336 static void draw_lowres_raster(void)
339 uint16_t *sptr = lowres_pixels;
340 uint16_t *dptr = fb_pixels;
342 for(i=0; i<lowres_height; i++) {
343 for(j=0; j<lowres_width; j++) {
344 draw_huge_pixel(dptr, fb_width, *sptr++);
345 dptr += LOWRES_SCALE;
347 dptr += fb_width * LOWRES_SCALE - fb_width;