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+ GNU GENERAL PUBLIC LICENSE
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+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+ <program> Copyright (C) <year> <name of author>
+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+ The GNU General Public License does not permit incorporating your program
+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
--- /dev/null
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include <GL/gl.h>
+#include "mesh.h"
+
+void draw_mesh(struct g3d_mesh *mesh)
+{
+ glEnableClientState(GL_VERTEX_ARRAY);
+ glEnableClientState(GL_NORMAL_ARRAY);
+ glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+ glEnableClientState(GL_COLOR_ARRAY);
+
+ glVertexPointer(3, GL_FLOAT, sizeof *mesh->varr, &mesh->varr->x);
+ glNormalPointer(GL_FLOAT, sizeof *mesh->varr, &mesh->varr->nx);
+ glTexCoordPointer(2, GL_FLOAT, sizeof *mesh->varr, &mesh->varr->u);
+ glColorPointer(4, GL_UNSIGNED_BYTE, sizeof *mesh->varr, &mesh->varr->r);
+
+ if(mesh->iarr) {
+ glDrawElements(mesh->prim, mesh->icount, GL_UNSIGNED_SHORT, mesh->iarr);
+ } else {
+ glDrawArrays(mesh->prim, 0, mesh->vcount);
+ }
+
+ glDisableClientState(GL_VERTEX_ARRAY);
+ glDisableClientState(GL_NORMAL_ARRAY);
+ glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+ glDisableClientState(GL_COLOR_ARRAY);
+}
+
+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))
+ 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 = GL_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->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 = GL_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->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;
+}
+
+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 = GL_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;
+}
+
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