From 6ca75e5d27980e082d977ffdb9a93589b55961ce Mon Sep 17 00:00:00 2001
From: Julian T <julian@jtle.dk>
Date: Sun, 22 Mar 2020 18:44:26 +0100
Subject: Added container allowing scatic allocation of all the scene data.

This will make porting to arduino alot easier
---
 scene.c | 99 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 91 insertions(+), 8 deletions(-)

(limited to 'scene.c')

diff --git a/scene.c b/scene.c
index 5a41041..331cd30 100644
--- a/scene.c
+++ b/scene.c
@@ -1,6 +1,7 @@
 #include "scene.h"
 
 #include <stdlib.h>
+#include <string.h>
 
 static inline void link_object(space_t *s, object_t *o)
 {
@@ -12,24 +13,94 @@ static inline void link_object(space_t *s, object_t *o)
 	}
 }
 
-object_t *add_sphere(space_t *s, vector_t *c, COORD_T r, material_t *m)
+container_t *container_init(container_t *c, unsigned objs, unsigned mats, unsigned ligs) 
 {
-	object_t *o = (object_t *) malloc(sizeof(object_t));
+	c->obj_index = c->mat_index = c->lig_index = 0;
 
+	c->obj_cap = objs;
+	c->mat_cap = mats;
+	c->lig_cap = ligs;
+
+	return c;
+}
+
+space_t *container_prepare_space(container_t *c)
+{
+	memset(&c->space, 0, sizeof(space_t));
+}
+
+// Finds the next empty object_t space
+// Return NULL if full
+static inline object_t *container_obj_space(container_t *cont) 
+{
+	if (cont->obj_index >= cont->obj_cap) {
+		fprintf(stderr, "Could not create object, because container is full\n");
+		return NULL;
+	}
+
+	// Find a nice spot in the content blob
+	return &((object_t *) cont->content)[cont->obj_index++];
+}
+
+static inline material_t *container_mat_space(container_t *cont) 
+{
+	if (cont->mat_index >= cont->mat_cap) {
+		fprintf(stderr, "Could not create material, because container is full\n");
+		return NULL;
+	}
+
+	// Find a nice spot in the content blob.
+	// Remember to jump over objects
+	return &((material_t *) (
+				cont->content + 
+				sizeof(object_t) * cont->obj_cap
+				))[cont->mat_index++];
+}
+
+static inline light_t *container_lig_space(container_t *cont) 
+{
+	if (cont->lig_index >= cont->lig_cap) {
+		fprintf(stderr, "Could not create light, because container is full\n");
+		return NULL;
+	}
+
+	// Find a nice spot in the content blob.
+	// Remember to jump over objects and materials
+	return &((light_t *) (
+				cont->content + 
+				sizeof(object_t) * cont->obj_cap + 
+				sizeof(material_t) * cont->mat_cap
+				))[cont->lig_index++];
+}
+
+object_t *add_sphere(container_t *cont, vector_t *c, COORD_T r, material_t *m)
+{
+
+	object_t *o = container_obj_space(cont);
+	if (!o) {
+		return NULL;
+	}
+
+	// Fill out the data
 	o->type = TYPE_SPHERE;
 	o->m = m;
 
 	o->sph.center = c;
 	o->sph.radius = r;
 
-	link_object(s, o);
+	// Link to the linked list
+	link_object(&cont->space, o);
 
 	return o;
 }
 
-object_t *add_plane(space_t *s, vector_t *start, vector_t *dir, material_t *m)
+object_t *add_plane(container_t *cont, vector_t *start, vector_t *dir, material_t *m)
 {
-	object_t *o = (object_t *) malloc(sizeof(object_t));
+
+	object_t *o = container_obj_space(cont);
+	if (!o) {
+		return NULL;
+	}
 
 	o->type = TYPE_PLANE;
 	o->m = m;
@@ -37,19 +108,23 @@ object_t *add_plane(space_t *s, vector_t *start, vector_t *dir, material_t *m)
 	o->pl.start = start;
 	o->pl.norm = dir;
 
-	link_object(s, o);
+	link_object(&cont->space, o);
 
 	return o;
 }
 
-light_t *add_light(space_t *s, vector_t *pos, color_t *defuse, color_t *specular)
+light_t *add_light(container_t *cont, vector_t *pos, color_t *defuse, color_t *specular)
 {
-	light_t *o = (light_t *) malloc(sizeof(light_t));
+	light_t *o = container_lig_space(cont);
+	if (!o) {
+		return NULL;
+	}
 
 	o->pos = pos;
 	o->defuse = defuse;
 	o->specular = specular;
 
+	space_t *s = &cont->space;
 	if (s) {
 		o->next = s->lights;
 		s->lights = o;
@@ -60,6 +135,14 @@ light_t *add_light(space_t *s, vector_t *pos, color_t *defuse, color_t *specular
 	return o;
 }
 
+// It's alot easier to set the stuff outside of this function
+material_t *add_material(container_t *cont)
+{
+	material_t *m = container_mat_space(cont);
+
+	return m;
+}
+
 void obj_norm_at(object_t *o, vector_t *dest, vector_t *point)
 {
 	switch(o->type) {
-- 
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