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#include <stdlib.h>
#include <stdio.h>
#include "util/err.h"
#include "scene.h"
void proj_default(struct projection *proj, enum projection_type type)
{
proj->type = type;
switch (type) {
case PROJ_PERSPECTIVE:
proj->perspective.fov.type = EXPR_NUMBER;
proj->perspective.fov.number = 45.0;
proj->perspective.planes[0] = 0.1f;
proj->perspective.planes[1] = 100.0f;
break;
case PROJ_ORTHO: {
float planes[6] = { -1.f, +1.f, -1.f, 1.f, 1.f, -1.f };
memcpy(proj->ortho.planes, planes, sizeof planes);
break;
}
}
}
void proj_free(struct projection *proj)
{
if (proj->type == PROJ_PERSPECTIVE)
expr_free(&proj->perspective.fov);
}
void surface_init(struct surface *surf)
{
surf->texture.present = false;
surf->color.type = EXPR_NUMBER;
surf->color.number = 0xffffff;
}
void registry_free(struct registry *reg)
{
free(reg->raw_vars.ptr);
free(reg->vars.ptr);
free(reg->cameras.ptr);
free(reg->bones.ptr);
}
void scene_init(struct scene *scene)
{
*scene = (struct scene) {
.fps = 25,
.size = { 100, 100 },
.root = { .type = NODE_TRANSFORM },
};
proj_default(&scene->proj, PROJ_PERSPECTIVE);
}
static void free_seq(size_t n_inst, struct seq_inst inst[n_inst])
{
for (size_t i = 0; i < n_inst; i++)
if (inst[i].type == SEQ_REP)
free_seq(inst[i].rep.children.len, inst[i].rep.children.ptr);
free(inst);
}
static void free_surface(struct surface *surf)
{
expr_free(&surf->color);
}
static void free_pos(struct pos *pos)
{
if (pos->type == POS_ABSOLUTE)
for (size_t i = 0; i < 3; i++)
expr_free(&pos->absolute[i]);
}
static void free_node(struct node *node)
{
switch (node->type) {
case NODE_TRANSFORM:
for (enum transform_op op = 0; op < TRANSFORM_OPS_N; op++)
for (size_t i = 0; i < 3; i++)
if (node->transform.has_op[op][i])
expr_free(&node->transform.op[op][i]);
for (size_t i = 0; i < node->transform.children.len; i++)
free_node(&node->transform.children.ptr[i]);
free(node->transform.children.ptr);
break;
case NODE_CAMERA:
free_pos(&node->camera.target);
break;
case NODE_OBJECT:
free_surface(&node->object.surface);
break;
case NODE_LIGHT:
case NODE_BONE:
break;
}
}
void scene_free(struct scene *scene)
{
free_seq(scene->seq.len, scene->seq.ptr);
free_node(&scene->root);
proj_free(&scene->proj);
if (scene->bg.present)
free_surface(&scene->bg.data);
}
static void bind_pos(struct pos *pos, struct source *src, struct registry *reg)
{
if (pos->type != POS_ATTACHED)
return;
struct bone **bone = nullptr;
map_find(®->bones, pos->attach_name.str, &bone);
if (!bone)
source_error(src, pos->attach_name.loc, "bone not found");
pos->attach = *bone;
}
static void bind_seq(size_t n_inst, struct seq_inst inst[n_inst], struct source *src, struct registry *reg)
{
for (size_t i = 0; i < n_inst; i++) {
switch (inst[i].type) {
case SEQ_POV:
struct camera **camera = nullptr;
map_find(®->cameras, inst[i].pov_name.str, &camera);
if (!camera)
source_error(src, inst[i].pov_name.loc, "camera not found");
inst[i].pov = *camera;
break;
case SEQ_REP:
bind_seq(inst[i].rep.children.len, inst[i].rep.children.ptr, src, reg);
break;
default:
break;
}
}
}
static bool seq_begins_pov(size_t n_inst, struct seq_inst inst[n_inst])
{
if (n_inst < 1) return false;
switch (inst[0].type) {
case SEQ_TIME: return false;
case SEQ_POV: return true;
case SEQ_REP: return inst[0].rep.times > 0
&& seq_begins_pov(inst[0].rep.children.len, inst[0].rep.children.ptr);
}
return false; // unreachable
}
void scene_bind(struct scene *scene, struct source *src, struct registry *reg)
{
if (reg->default_camera)
bind_pos(®->default_camera->target, src, reg);
for (size_t i = 0; i < reg->cameras.len; i++)
bind_pos(®->cameras.ptr[i].val->target, src, reg);
bind_seq(scene->seq.len, scene->seq.ptr, src, reg);
if (reg->default_camera)
scene->camera = reg->default_camera;
else if (!seq_begins_pov(scene->seq.len, scene->seq.ptr))
eprintf("sequence does not begin with a pov command and no unnamed camera found\n");
}
static void load_surface(struct surface *surf, struct source *src, struct draw_backend *draw, struct cache *cache)
{
if (surf->texture.present)
texture_load(&surf->texture.data, src, draw, cache);
}
static void load_node(struct node *node, struct source *src, struct draw_backend *draw, struct cache *cache)
{
switch (node->type) {
case NODE_TRANSFORM:
for (size_t i = 0; i < node->transform.children.len; i++)
load_node(&node->transform.children.ptr[i], src, draw, cache);
break;
case NODE_OBJECT:
load_surface(&node->object.surface, src, draw, cache);
mesh_load(&node->object.mesh, src, draw, cache);
break;
default:
break;
}
}
void scene_load(struct scene *scene, struct source *src, struct draw_backend *draw)
{
struct cache cache = {};
load_node(&scene->root, src, draw, &cache);
if (scene->bg.present)
load_surface(&scene->bg.data, src, draw, &cache);
cache_free(&cache);
}
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