From e81e2ea117a67364786184aa328bc6e2b543e38f Mon Sep 17 00:00:00 2001
From: Arnold <27396817+arngo@users.noreply.github.com>
Date: Fri, 26 May 2023 12:09:26 -0400
Subject: implemented 2d collision system

---
 src/collision/rodeo_collision.c | 126 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 src/collision/rodeo_collision.c

(limited to 'src')

diff --git a/src/collision/rodeo_collision.c b/src/collision/rodeo_collision.c
new file mode 100644
index 0000000..e4791bf
--- /dev/null
+++ b/src/collision/rodeo_collision.c
@@ -0,0 +1,126 @@
+#include "rodeo/collision.h"
+#include "rodeo/collision_t.h"
+#include <stdio.h>
+
+bool detect_collision(
+	const rodeo_collision_2d_world_item_t *a,
+	const rodeo_collision_2d_world_item_t *b
+)
+{
+	return !(a->x+a->dx > b->x+b->dx + b->width ||
+			b->x+b->dx > a->x+a->dx + a->width ||
+			a->y+a->dy > b->y+b->dy + b->height ||
+			b->y+b->dy > a->y+a->dy + a->height);
+}
+
+rodeo_collision_2d_world_t
+rodeo_collision_2d_world_create(void)
+{
+	return cvec_collision_2d_world_item_init();
+}
+
+void
+rodeo_collision_2d_world_destroy(
+rodeo_collision_2d_world_t *world
+)
+{
+	cvec_collision_2d_world_item_drop(world);
+}
+
+cvec_collision_2d_world_item_value*
+rodeo_collision_2d_world_item_create(
+	rodeo_collision_2d_world_t *world,
+	rodeo_collision_2d_world_item_t item_params
+)
+{
+	static uint32_t next_id = 0;
+	item_params.id.id = next_id++;
+	item_params.id.world = world;
+	cvec_collision_2d_world_item_value* new_item = cvec_collision_2d_world_item_push(world, item_params);
+	
+	return new_item;
+}
+
+void
+rodeo_collision_2d_world_item_destroy(
+	cvec_collision_2d_world_item_value* cvec_value
+)
+{
+	
+	cvec_collision_2d_world_item_value temp = *cvec_collision_2d_world_item_back(cvec_value->id.world);
+	*cvec_collision_2d_world_item_back(cvec_value->id.world) = *cvec_value;
+	*cvec_value = temp;
+	cvec_collision_2d_world_item_pop(cvec_value->id.world);
+}
+
+void
+rodeo_collision_2d_world_item_destroy_by_id(
+	world_id id
+)
+{
+	rodeo_collision_2d_world_item_t* item = rodeo_collision_2d_world_item_get_by_id(id);
+	rodeo_collision_2d_world_item_destroy(item);
+}
+
+rodeo_collision_2d_world_item_t*
+rodeo_collision_2d_world_item_get_by_id(
+	world_id id
+)
+{
+	c_foreach(i, cvec_collision_2d_world_item, *id.world) {
+		if (i.ref->id.id == id.id) {
+			return i.ref;
+		}
+	}
+	return NULL;
+}
+
+void
+rodeo_collision_2d_world_compare_self(
+	rodeo_collision_2d_world_t *world,
+	void (*resolve)(
+		rodeo_collision_2d_world_item_t *a,
+		rodeo_collision_2d_world_item_t *b
+	)
+)
+{
+	c_foreach(i, cvec_collision_2d_world_item, *world) {
+		c_foreach(j, cvec_collision_2d_world_item, cvec_collision_2d_world_item_advance(i, 1), cvec_collision_2d_world_item_end(world)) {
+			if (detect_collision(i.ref, j.ref)) {
+				resolve(i.ref, j.ref);
+			}
+		}
+	}
+}
+
+void
+rodeo_collision_2d_world_compare_other(
+	rodeo_collision_2d_world_t *world_a,
+	rodeo_collision_2d_world_t *world_b,
+	void (*resolve)(
+		rodeo_collision_2d_world_item_t *a,
+		rodeo_collision_2d_world_item_t *b
+	)
+)
+{
+	c_foreach(i, cvec_collision_2d_world_item, *world_a) {
+		c_foreach(j, cvec_collision_2d_world_item, *world_b) {
+			if (detect_collision(i.ref, j.ref)) {
+				resolve(i.ref, j.ref);
+			}
+		}
+	}
+}
+
+
+int rodeo_collision_2d_item_cmp(
+	const rodeo_collision_2d_world_item_t* a,
+	const rodeo_collision_2d_world_item_t* b
+)
+{
+	if (a->id.id == b->id.id) {
+		return 0;
+	} else {
+		return a->id.id > b->id.id ? 1 : -1;
+	}
+}
-- 
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