+void g3d_mtl_shininess(float shin)
+{
+ st->mtl.shin = shin;
+}
+
+static INLINE int calc_shift(unsigned int x)
+{
+ int res = -1;
+ while(x) {
+ x >>= 1;
+ ++res;
+ }
+ return res;
+}
+
+static INLINE int calc_mask(unsigned int x)
+{
+ return x - 1;
+}
+
+void g3d_set_texture(int xsz, int ysz, void *pixels)
+{
+ pfill_tex.pixels = pixels;
+ pfill_tex.width = xsz;
+ pfill_tex.height = ysz;
+
+ pfill_tex.xshift = calc_shift(xsz);
+ pfill_tex.yshift = calc_shift(ysz);
+ pfill_tex.xmask = calc_mask(xsz);
+ pfill_tex.ymask = calc_mask(ysz);
+}
+
+void g3d_draw(int prim, const struct g3d_vertex *varr, int varr_size)
+{
+ g3d_draw_indexed(prim, varr, varr_size, 0, 0);
+}
+
+void g3d_draw_indexed(int prim, const struct g3d_vertex *varr, int varr_size,
+ const uint16_t *iarr, int iarr_size)
+{
+ int i, j, vnum, nfaces, fill_mode;
+ struct pvertex pv[16];
+ struct g3d_vertex v[16];
+ int mvtop = st->mtop[G3D_MODELVIEW];
+ int ptop = st->mtop[G3D_PROJECTION];
+ struct g3d_vertex *tmpv;
+
+ tmpv = alloca(prim * 6 * sizeof *tmpv);
+
+ /* calc the normal matrix */
+ memcpy(st->norm_mat, st->mat[G3D_MODELVIEW][mvtop], 16 * sizeof(float));
+ st->norm_mat[12] = st->norm_mat[13] = st->norm_mat[14] = 0.0f;
+
+ nfaces = (iarr ? iarr_size : varr_size) / prim;
+
+ for(j=0; j<nfaces; j++) {
+ vnum = prim; /* reset vnum for each iteration */
+
+ for(i=0; i<vnum; i++) {
+ v[i] = iarr ? varr[*iarr++] : *varr++;
+
+ xform4_vec3(st->mat[G3D_MODELVIEW][mvtop], &v[i].x);
+ xform3_vec3(st->norm_mat, &v[i].nx);
+
+ if(st->opt & G3D_LIGHTING) {
+ shade(v + i);
+ }
+ if(st->opt & G3D_TEXTURE_GEN) {
+ v[i].u = v[i].nx * 0.5 + 0.5;
+ v[i].v = v[i].ny * 0.5 + 0.5;
+ }
+ if(st->opt & G3D_TEXTURE_MAT) {
+ float *mat = st->mat[G3D_TEXTURE][st->mtop[G3D_TEXTURE]];
+ float x = mat[0] * v[i].u + mat[4] * v[i].v + mat[12];
+ float y = mat[1] * v[i].u + mat[5] * v[i].v + mat[13];
+ float w = mat[3] * v[i].u + mat[7] * v[i].v + mat[15];
+ v[i].u = x / w;
+ v[i].v = y / w;
+ }
+ xform4_vec3(st->mat[G3D_PROJECTION][ptop], &v[i].x);
+ }
+
+ /* clipping */
+ if(st->opt & G3D_CLIP_FRUSTUM) {
+ for(i=0; i<6; i++) {
+ memcpy(tmpv, v, vnum * sizeof *v);
+
+ if(clip_frustum(v, &vnum, tmpv, vnum, i) < 0) {
+ /* polygon completely outside of view volume. discard */
+ vnum = 0;
+ break;
+ }
+ }
+
+ if(!vnum) continue;
+ }