diff options
Diffstat (limited to 'camera.c')
| -rw-r--r-- | camera.c | 89 |
1 files changed, 88 insertions, 1 deletions
@@ -8,6 +8,73 @@ #include "graphics.h" #include "internal.h" +/* + * references: + * - https://learnopengl.com/Advanced-OpenGL/Cubemaps + */ +static Point3 +skyboxvs(VSparams *sp) +{ + Point3 p; + + addvattr(sp->v, "dir", VAPoint, &sp->v->p); + /* only rotate along with the camera */ + p = sp->v->p; p.w = 0; + p = world2vcs(sp->su->camera, p); p.w = 1; + p = vcs2clip(sp->su->camera, p); + /* force the cube to always be on the far plane */ + p.z = -p.w; + return p; +} + +static Color +skyboxfs(FSparams *sp) +{ + Vertexattr *va; + Color c; + + va = getvattr(&sp->v, "dir"); + c = cubemaptexture(sp->su->camera->scene->skybox, va->p, neartexsampler); + return c; +} + +static Model * +mkskyboxmodel(void) +{ + static Point3 axes[3] = {{0,1,0,0}, {1,0,0,0}, {0,0,1,0}}; + static Point3 center = {0,0,0,1}; + Model *m; + Primitive t[2]; + Point3 p, v1, v2; + int i, j, k; + + m = newmodel(); + memset(t, 0, sizeof t); + t[0].type = t[1].type = PTriangle; + + p = Vec3(-0.5,-0.5,0.5); + v1 = Vec3(1,0,0); + v2 = Vec3(0,1,0); + t[0].v[0].p = addpt3(center, p); + t[0].v[1].p = addpt3(center, addpt3(p, v1)); + t[0].v[2].p = addpt3(center, addpt3(p, addpt3(v1, v2))); + t[1].v[0] = t[0].v[0]; + t[1].v[1] = t[0].v[2]; + t[1].v[2].p = addpt3(center, addpt3(p, v2)); + + for(i = 0; i < 6; i++){ + for(j = 0; j < 2; j++) + for(k = 0; k < 3; k++) + if(i > 0) + t[j].v[k].p = qrotate(t[j].v[k].p, axes[i%3], PI/2); + + m->prims = erealloc(m->prims, (m->nprims += 2)*sizeof(*m->prims)); + m->prims[m->nprims-2] = t[0]; + m->prims[m->nprims-1] = t[1]; + } + return m; +} + static void updatestats(Camera *c, uvlong v) { @@ -91,13 +158,17 @@ reloadcamera(Camera *c) void shootcamera(Camera *c, Shadertab *s) { + static Scene *skyboxscene; + static Shadertab skyboxshader = { nil, skyboxvs, skyboxfs }; + Model *mdl; Renderjob *job; uvlong t0, t1; job = emalloc(sizeof *job); memset(job, 0, sizeof *job); job->fb = c->vp->fbctl->getbb(c->vp->fbctl); - job->scene = c->s; + job->camera = c; + job->scene = c->scene; job->shaders = s; job->donec = chancreate(sizeof(void*), 0); @@ -105,6 +176,22 @@ shootcamera(Camera *c, Shadertab *s) t0 = nanosec(); sendp(c->rctl->c, job); recvp(job->donec); + /* + * if the scene has a skybox, do another render pass, + * filling in the fragments left untouched by the z-buffer. + */ + if(c->scene->skybox != nil){ + if(skyboxscene == nil){ + skyboxscene = newscene("skybox"); + mdl = mkskyboxmodel(); + skyboxscene->addent(skyboxscene, newentity(mdl)); + } + skyboxscene->skybox = c->scene->skybox; + job->scene = skyboxscene; + job->shaders = &skyboxshader; + sendp(c->rctl->c, job); + recvp(job->donec); + } t1 = nanosec(); c->vp->fbctl->swap(c->vp->fbctl); |