+++ /dev/null
-#include <stdio.h>
-#include <stdlib.h>
-#include <math.h>
-#include "mesh.h"
-#include "3dgfx.h"
-
-int load_mesh(struct g3d_mesh *mesh, const char *fname)
-{
- return -1; /* TODO */
-}
-
-static struct {
- struct g3d_vertex *varr;
- const float *xform;
-} zsort_cls;
-
-static int zsort_cmp(const void *aptr, const void *bptr)
-{
- const float *m = zsort_cls.xform;
-
- const struct g3d_vertex *va = (const struct g3d_vertex*)aptr;
- const struct g3d_vertex *vb = (const struct g3d_vertex*)bptr;
-
- float za = m[2] * va->x + m[6] * va->y + m[10] * va->z + m[14];
- float zb = m[2] * vb->x + m[6] * vb->y + m[10] * vb->z + m[14];
-
- ++va;
- ++vb;
-
- za += m[2] * va->x + m[6] * va->y + m[10] * va->z + m[14];
- zb += m[2] * vb->x + m[6] * vb->y + m[10] * vb->z + m[14];
-
- return za - zb;
-}
-
-static int zsort_indexed_cmp(const void *aptr, const void *bptr)
-{
- const int16_t *a = (const int16_t*)aptr;
- const int16_t *b = (const int16_t*)bptr;
-
- const float *m = zsort_cls.xform;
-
- const struct g3d_vertex *va = zsort_cls.varr + a[0];
- const struct g3d_vertex *vb = zsort_cls.varr + b[0];
-
- float za = m[2] * va->x + m[6] * va->y + m[10] * va->z + m[14];
- float zb = m[2] * vb->x + m[6] * vb->y + m[10] * vb->z + m[14];
-
- va = zsort_cls.varr + a[2];
- vb = zsort_cls.varr + b[2];
-
- za += m[2] * va->x + m[6] * va->y + m[10] * va->z + m[14];
- zb += m[2] * vb->x + m[6] * vb->y + m[10] * vb->z + m[14];
-
- return za - zb;
-}
-
-
-void zsort_mesh(struct g3d_mesh *m)
-{
- zsort_cls.varr = m->varr;
- zsort_cls.xform = g3d_get_matrix(G3D_MODELVIEW, 0);
-
- if(m->iarr) {
- int nfaces = m->icount / m->prim;
- qsort(m->iarr, nfaces, m->prim * sizeof *m->iarr, zsort_indexed_cmp);
- } else {
- int nfaces = m->vcount / m->prim;
- qsort(m->varr, nfaces, m->prim * sizeof *m->varr, zsort_cmp);
- }
-}
-
-
-void draw_mesh(struct g3d_mesh *mesh)
-{
- if(mesh->iarr) {
- g3d_draw_indexed(mesh->prim, mesh->varr, mesh->vcount, mesh->iarr, mesh->icount);
- } else {
- g3d_draw(mesh->prim, mesh->varr, mesh->vcount);
- }
-}
-
-
-#define NORMAL(vp, x, y, z) do { vp->nx = x; vp->ny = y; vp->nz = z; } while(0)
-#define COLOR(vp, cr, cg, cb) do { vp->r = cr; vp->g = cg; vp->b = cb; } while(0)
-#define TEXCOORD(vp, tu, tv) do { vp->u = tu; vp->v = tv; } while(0)
-#define VERTEX(vp, vx, vy, vz) \
- do { \
- vp->x = vx; vp->y = vy; vp->z = vz; vp->w = 1.0f; \
- ++vp; \
- } while(0)
-
-int gen_cube(struct g3d_mesh *mesh, float sz, int sub)
-{
- struct g3d_vertex *vptr;
- float hsz = sz / 2.0;
-
- mesh->prim = G3D_QUADS;
- mesh->iarr = 0;
- mesh->icount = 0;
-
- mesh->vcount = 24;
- if(!(mesh->varr = malloc(mesh->vcount * sizeof *mesh->varr))) {
- return -1;
- }
- vptr = mesh->varr;
-
- /* -Z */
- NORMAL(vptr, 0, 0, -1);
- COLOR(vptr, 255, 0, 255);
- VERTEX(vptr, hsz, -hsz, -hsz);
- VERTEX(vptr, -hsz, -hsz, -hsz);
- VERTEX(vptr, -hsz, hsz, -hsz);
- VERTEX(vptr, hsz, hsz, -hsz);
- /* -Y */
- NORMAL(vptr, 0, -1, 0);
- COLOR(vptr, 0, 255, 255);
- VERTEX(vptr, -hsz, -hsz, -hsz);
- VERTEX(vptr, hsz, -hsz, -hsz);
- VERTEX(vptr, hsz, -hsz, hsz);
- VERTEX(vptr, -hsz, -hsz, hsz);
- /* -X */
- NORMAL(vptr, -1, 0, 0);
- COLOR(vptr, 255, 255, 0);
- VERTEX(vptr, -hsz, -hsz, -hsz);
- VERTEX(vptr, -hsz, -hsz, hsz);
- VERTEX(vptr, -hsz, hsz, hsz);
- VERTEX(vptr, -hsz, hsz, -hsz);
- /* +X */
- NORMAL(vptr, 1, 0, 0);
- COLOR(vptr, 255, 0, 0);
- VERTEX(vptr, hsz, -hsz, hsz);
- VERTEX(vptr, hsz, -hsz, -hsz);
- VERTEX(vptr, hsz, hsz, -hsz);
- VERTEX(vptr, hsz, hsz, hsz);
- /* +Y */
- NORMAL(vptr, 0, 1, 0);
- COLOR(vptr, 0, 255, 0);
- VERTEX(vptr, -hsz, hsz, hsz);
- VERTEX(vptr, hsz, hsz, hsz);
- VERTEX(vptr, hsz, hsz, -hsz);
- VERTEX(vptr, -hsz, hsz, -hsz);
- /* +Z */
- NORMAL(vptr, 0, 0, 1);
- COLOR(vptr, 0, 0, 255);
- VERTEX(vptr, -hsz, -hsz, hsz);
- VERTEX(vptr, hsz, -hsz, hsz);
- VERTEX(vptr, hsz, hsz, hsz);
- VERTEX(vptr, -hsz, hsz, hsz);
-
- return 0;
-}
-
-static void torusvec(float *res, float theta, float phi, float mr, float rr)
-{
- float rx, ry, rz;
- theta = -theta;
-
- rx = -cos(phi) * rr + mr;
- ry = sin(phi) * rr;
- rz = 0.0f;
-
- res[0] = rx * sin(theta) + rz * cos(theta);
- res[1] = ry;
- res[2] = -rx * cos(theta) + rz * sin(theta);
-}
-
-int gen_torus(struct g3d_mesh *mesh, float rad, float ringrad, int usub, int vsub)
-{
- int i, j;
- int nfaces, uverts, vverts;
- struct g3d_vertex *vptr;
- int16_t *iptr;
-
- mesh->prim = G3D_QUADS;
-
- if(usub < 4) usub = 4;
- if(vsub < 2) vsub = 2;
-
- uverts = usub + 1;
- vverts = vsub + 1;
-
- mesh->vcount = uverts * vverts;
- nfaces = usub * vsub;
- mesh->icount = nfaces * 4;
-
- printf("generating torus with %d faces (%d vertices)\n", nfaces, mesh->vcount);
-
- if(!(mesh->varr = malloc(mesh->vcount * sizeof *mesh->varr))) {
- return -1;
- }
- if(!(mesh->iarr = malloc(mesh->icount * sizeof *mesh->iarr))) {
- return -1;
- }
- vptr = mesh->varr;
- iptr = mesh->iarr;
-
- for(i=0; i<uverts; i++) {
- float u = (float)i / (float)(uverts - 1);
- float theta = u * 2.0 * M_PI;
- float rcent[3];
-
- torusvec(rcent, theta, 0, rad, 0);
-
- for(j=0; j<vverts; j++) {
- float v = (float)j / (float)(vverts - 1);
- float phi = v * 2.0 * M_PI;
- int chess = (i & 1) == (j & 1);
-
- torusvec(&vptr->x, theta, phi, rad, ringrad);
-
- vptr->nx = (vptr->x - rcent[0]) / ringrad;
- vptr->ny = (vptr->y - rcent[1]) / ringrad;
- vptr->nz = (vptr->z - rcent[2]) / ringrad;
- vptr->u = u;
- vptr->v = v;
- vptr->r = chess ? 255 : 64;
- vptr->g = 128;
- vptr->b = chess ? 64 : 255;
- ++vptr;
-
- if(i < usub && j < vsub) {
- int idx = i * vverts + j;
- *iptr++ = idx;
- *iptr++ = idx + 1;
- *iptr++ = idx + vverts + 1;
- *iptr++ = idx + vverts;
- }
- }
- }
- return 0;
-}
-
projects / dosdemo / blobdiff