+++ /dev/null
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <math.h>
-#include "mesh.h"
-#include "3dgfx.h"
-
-void free_mesh(struct g3d_mesh *mesh)
-{
- destroy_mesh(mesh);
- free(mesh);
-}
-
-void destroy_mesh(struct g3d_mesh *mesh)
-{
- free(mesh->varr);
- free(mesh->iarr);
-}
-
-int copy_mesh(struct g3d_mesh *dest, struct g3d_mesh *src)
-{
- dest->prim = src->prim;
- if(src->varr) {
- if(!(dest->varr = malloc(src->vcount * sizeof *src->varr))) {
- return -1;
- }
- memcpy(dest->varr, src->varr, src->vcount * sizeof *src->varr);
- }
- dest->vcount = src->vcount;
- if(src->iarr) {
- if(!(dest->iarr = malloc(src->icount * sizeof *src->iarr))) {
- free(dest->varr);
- dest->varr = 0;
- return -1;
- }
- memcpy(dest->iarr, src->iarr, src->icount * sizeof *src->iarr);
- }
- dest->icount = src->icount;
- return 0;
-}
-
-static struct {
- int prim;
- struct g3d_vertex *varr;
- const float *xform;
-} zsort_cls;
-
-static int zsort_cmp(const void *aptr, const void *bptr)
-{
- int i;
- float za = 0.0f;
- float zb = 0.0f;
- 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;
-
- for(i=0; i<zsort_cls.prim; i++) {
- 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];
- ++va;
- ++vb;
- }
- return za - zb;
-}
-
-static int zsort_indexed_cmp(const void *aptr, const void *bptr)
-{
- int i;
- float za = 0.0f;
- float zb = 0.0f;
- const uint16_t *a = (const uint16_t*)aptr;
- const uint16_t *b = (const uint16_t*)bptr;
-
- const float *m = zsort_cls.xform;
-
- for(i=0; i<zsort_cls.prim; i++) {
- const struct g3d_vertex *va = zsort_cls.varr + a[i];
- const struct g3d_vertex *vb = zsort_cls.varr + b[i];
-
- 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);
- zsort_cls.prim = m->prim;
-
- 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);
- }
-}
-
-void apply_mesh_xform(struct g3d_mesh *mesh, const float *xform)
-{
- int i;
- struct g3d_vertex *v = mesh->varr;
-
- for(i=0; i<mesh->vcount; i++) {
- float x = xform[0] * v->x + xform[4] * v->y + xform[8] * v->z + xform[12];
- float y = xform[1] * v->x + xform[5] * v->y + xform[9] * v->z + xform[13];
- v->z = xform[2] * v->x + xform[6] * v->y + xform[10] * v->z + xform[14];
- v->x = x;
- v->y = y;
- x = xform[0] * v->nx + xform[4] * v->ny + xform[8] * v->nz;
- y = xform[1] * v->nx + xform[5] * v->ny + xform[9] * v->nz;
- v->nz = xform[2] * v->nx + xform[6] * v->ny + xform[10] * v->nz;
- v->nx = x;
- v->ny = y;
- ++v;
- }
-}
-
-int append_mesh(struct g3d_mesh *ma, struct g3d_mesh *mb)
-{
- int i, new_vcount, new_icount;
- void *tmp;
- uint16_t *iptr;
-
- if(ma->prim != mb->prim) {
- fprintf(stderr, "append_mesh failed, primitive mismatch\n");
- return -1;
- }
-
- if(ma->iarr || mb->iarr) {
- if(!ma->iarr) {
- if(indexify_mesh(ma) == -1) {
- return -1;
- }
- } else if(!mb->iarr) {
- if(indexify_mesh(mb) == -1) {
- return -1;
- }
- }
-
- new_icount = ma->icount + mb->icount;
- if(!(iptr = realloc(ma->iarr, new_icount * sizeof *iptr))) {
- fprintf(stderr, "append_mesh: failed to allocate combined index buffer (%d indices)\n", new_icount);
- return -1;
- }
- ma->iarr = iptr;
-
- iptr += ma->icount;
- for(i=0; i<mb->icount; i++) {
- *iptr++ = mb->iarr[i] + ma->vcount;
- }
- ma->icount = new_icount;
- }
-
- new_vcount = ma->vcount + mb->vcount;
- if(!(tmp = realloc(ma->varr, new_vcount * sizeof *ma->varr))) {
- fprintf(stderr, "append_mesh: failed to allocate combined vertex buffer (%d verts)\n", new_vcount);
- return -1;
- }
- ma->varr = tmp;
- memcpy(ma->varr + ma->vcount, mb->varr, mb->vcount * sizeof *ma->varr);
- ma->vcount = new_vcount;
- return 0;
-}
-
-#define FEQ(a, b) ((a) - (b) < 1e-5 && (b) - (a) < 1e-5)
-static int cmp_vertex(struct g3d_vertex *a, struct g3d_vertex *b)
-{
- if(!FEQ(a->x, b->x) || !FEQ(a->y, b->y) || !FEQ(a->z, b->z) || !FEQ(a->w, b->w))
- return -1;
- if(!FEQ(a->nx, b->nx) || !FEQ(a->ny, b->ny) || !FEQ(a->nz, b->nz))
- return -1;
- if(!FEQ(a->u, b->u) || !FEQ(a->v, b->v))
- return -1;
- if(a->r != b->r || a->g != b->g || a->b != b->b || a->a != b->a)
- return -1;
- return 0;
-}
-
-static int find_existing(struct g3d_vertex *v, struct g3d_vertex *varr, int vcount)
-{
- int i;
- for(i=0; i<vcount; i++) {
- if(cmp_vertex(v, varr++) == 0) {
- return i;
- }
- }
- return -1;
-}
-
-int indexify_mesh(struct g3d_mesh *mesh)
-{
- int i, j, nfaces, max_icount, idx;
- int out_vcount = 0;
- struct g3d_vertex *vin, *vout;
- uint16_t *iout;
-
- if(mesh->iarr) {
- fprintf(stderr, "indexify_mesh failed: already indexed\n");
- return -1;
- }
-
- nfaces = mesh->vcount / mesh->prim;
- max_icount = mesh->vcount;
-
- if(!(mesh->iarr = malloc(max_icount * sizeof *mesh->iarr))) {
- fprintf(stderr, "indexify_mesh failed to allocate index buffer of %d indices\n", max_icount);
- return -1;
- }
-
- vin = vout = mesh->varr;
- iout = mesh->iarr;
-
- for(i=0; i<nfaces; i++) {
- for(j=0; j<mesh->prim; j++) {
- if((idx = find_existing(vin, mesh->varr, out_vcount)) >= 0) {
- *iout++ = idx;
- } else {
- *iout++ = out_vcount++;
- if(vin != vout) {
- *vout++ = *vin;
- }
- }
- ++vin;
- }
- }
-
- /* XXX also shrink buffers? I'll just leave them to max size for now */
- return 0;
-}
-
-void normalize_mesh_normals(struct g3d_mesh *mesh)
-{
- int i;
- struct g3d_vertex *v = mesh->varr;
-
- for(i=0; i<mesh->vcount; i++) {
- float mag = sqrt(v->nx * v->nx + v->ny * v->ny + v->nz * v->nz);
- float s = (mag == 0.0f) ? 1.0f : 1.0f / mag;
- v->nx *= s;
- v->ny *= s;
- v->nz *= s;
- ++v;
- }
-}
-
-
-static void sphvec(float *res, float theta, float phi, float rad)
-{
- theta = -theta;
- res[0] = sin(theta) * sin(phi);
- res[1] = cos(phi);
- res[2] = cos(theta) * sin(phi);
-}
-
-int gen_sphere_mesh(struct g3d_mesh *mesh, float rad, int usub, int vsub)
-{
- int i, j;
- int nfaces, uverts, vverts;
- struct g3d_vertex *vptr;
- uint16_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;
-
- if(!(mesh->varr = malloc(mesh->vcount * sizeof *mesh->varr))) {
- fprintf(stderr, "gen_sphere_mesh: failed to allocate vertex buffer (%d vertices)\n", mesh->vcount);
- return -1;
- }
- if(!(mesh->iarr = malloc(mesh->icount * sizeof *mesh->iarr))) {
- fprintf(stderr, "gen_sphere_mesh: failed to allocate index buffer (%d indices)\n", mesh->icount);
- 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;
-
- for(j=0; j<vverts; j++) {
- float v = (float)j / (float)(vverts - 1);
- float phi = v * M_PI;
- int chess = (i & 1) == (j & 1);
-
- sphvec(&vptr->x, theta, phi, rad);
- vptr->w = 1.0f;
-
- vptr->nx = vptr->x / rad;
- vptr->ny = vptr->y / rad;
- vptr->nz = vptr->z / rad;
- 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;
-}
-
-int gen_plane_mesh(struct g3d_mesh *m, float width, float height, int usub, int vsub)
-{
- int i, j;
- int nfaces, nverts, nidx, uverts, vverts;
- float x, y, u, v, du, dv;
- struct g3d_vertex *vptr;
- uint16_t *iptr;
-
- if(usub < 1) usub = 1;
- if(vsub < 1) vsub = 1;
-
- nfaces = usub * vsub;
- uverts = usub + 1;
- vverts = vsub + 1;
- du = (float)width / (float)usub;
- dv = (float)height / (float)vsub;
-
- nverts = uverts * vverts;
- nidx = nfaces * 4;
-
- if(!(m->varr = malloc(nverts * sizeof *m->varr))) {
- fprintf(stderr, "gen_plane_mesh: failed to allocate vertex buffer (%d vertices)\n", nverts);
- return -1;
- }
- if(!(m->iarr = malloc(nidx * sizeof *m->iarr))) {
- fprintf(stderr, "gen_plane_mesh: failed to allocate index buffer (%d indices)\n", nidx);
- free(m->varr);
- m->varr = 0;
- return -1;
- }
-
- m->prim = G3D_QUADS;
- m->vcount = nverts;
- m->icount = nidx;
-
- vptr = m->varr;
- iptr = m->iarr;
-
- v = 0.0f;
- for(i=0; i<vverts; i++) {
- y = (v - 0.5) * height;
- u = 0.0f;
-
- for(j=0; j<uverts; j++) {
- x = (u - 0.5) * width;
-
- vptr->x = x;
- vptr->y = y;
- vptr->z = 0.0f;
- vptr->w = 1.0f;
- vptr->nx = 0.0f;
- vptr->ny = 0.0f;
- vptr->nz = 1.0f;
- vptr->u = u;
- vptr->v = v;
- vptr->r = vptr->g = vptr->b = vptr->a = 255;
- ++vptr;
-
- u += du;
- }
- v += dv;
- }
-
- for(i=0; i<vsub; i++) {
- for(j=0; j<usub; j++) {
- int idx = i * uverts + j;
- *iptr++ = idx;
- *iptr++ = idx + 1;
- *iptr++ = idx + uverts + 1;
- *iptr++ = idx + uverts;
- }
- }
- return 0;
-}
-
-int gen_cube_mesh(struct g3d_mesh *mesh, float sz, int sub)
-{
- int i;
- struct g3d_mesh *m;
- struct g3d_mesh tmpmesh;
- static float rotface[][4] = {
- {0, 0, 1, 0},
- {90, 0, 1, 0},
- {180, 0, 1, 0},
- {270, 0, 1, 0},
- {90, 1, 0, 0},
- {-90, 1, 0, 0}
- };
-
- g3d_matrix_mode(G3D_MODELVIEW);
- g3d_push_matrix();
-
- for(i=0; i<6; i++) {
- m = i > 0 ? &tmpmesh : mesh;
- if(gen_plane_mesh(m, sz, sz, sub, sub) == -1)
- return -1;
- g3d_load_identity();
- g3d_rotate(rotface[i][0], rotface[i][1], rotface[i][2], rotface[i][3]);
- g3d_translate(0, 0, sz / 2.0f);
- apply_mesh_xform(m, g3d_get_matrix(G3D_MODELVIEW, 0));
- if(i > 0) {
- if(append_mesh(mesh, m) == -1) {
- return -1;
- }
- }
- }
-
- g3d_pop_matrix();
- 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_mesh(struct g3d_mesh *mesh, float rad, float ringrad, int usub, int vsub)
-{
- int i, j;
- int nfaces, uverts, vverts;
- struct g3d_vertex *vptr;
- uint16_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->w = 1.0f;
-
- 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