83 void rt_heightfield(void *tex, vector ctr, int m, int n, apiflt *field, apiflt wx, apiflt wy) {  in rt_heightfield()  argument
95             v0.y = field[(yy)*m + (xx)] + zoff;  in rt_heightfield()
99             v1.y = field[(yy)*m + (xx + 1)] + zoff;  in rt_heightfield()
103             v2.y = field[(yy + 1) * m + (xx + 1)] + zoff;  in rt_heightfield()
109             v0.y = field[(yy)*m + (xx)] + zoff;  in rt_heightfield()
113             v1.y = field[(yy + 1) * m + (xx)] + zoff;  in rt_heightfield()
117             v2.y = field[(yy + 1) * m + (xx + 1)] + zoff;  in rt_heightfield()
126 rt_sheightfield(void *tex, vector ctr, int m, int n, apiflt *field, apiflt wx, apiflt wy) {  in rt_sheightfield()  argument
148                 rt_vector(x * xinc + offset.x, field[addr] + offset.z, y * yinc + offset.y);  in rt_sheightfield()
163             normals[addr] = rt_vector(-(field[addr + 1] - field[addr - 1]) / (2.0 * xinc),  in rt_sheightfield()
165                                       -(field[addr + m] - field[addr - m]) / (2.0 * yinc));  in rt_sheightfield()
254     apiflt *field;  in rt_landscape()  local
260     field = (apiflt *)malloc(totalsize * sizeof(apiflt));  in rt_landscape()
264             field[x + y * m] = 0.0;  in rt_landscape()
268     field[0 + 0] = 1.0 + (rand() % 100) / 100.0;  in rt_landscape()
269     field[m - 1] = 1.0 + (rand() % 100) / 100.0;  in rt_landscape()
270     field[0 + m * (n - 1)] = 1.0 + (rand() % 100) / 100.0;  in rt_landscape()
271     field[m - 1 + m * (n - 1)] = 1.0 + (rand() % 100) / 100.0;  in rt_landscape()
273     subdivide(field, m, n, wx, wy, 0, 0, m - 1, n - 1);  in rt_landscape()
275     rt_sheightfield(tex, ctr, m, n, field, wx, wy);  in rt_landscape()
277     free(field);  in rt_landscape()