From 2da353ada0685a4a8780bf8d2f5aa63252c3f0a5 Mon Sep 17 00:00:00 2001
From: quou <quou@disroot.org>
Date: Wed, 3 Jul 2024 21:20:02 +1000
Subject: Spinning torus

---
 3de.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

(limited to '3de.c')

diff --git a/3de.c b/3de.c
index 1b88ae3..6bf9e33 100644
--- a/3de.c
+++ b/3de.c
@@ -1,10 +1,42 @@
 #include "config.h"
+#include "maths.h"
 #include "memory.h"
 #include "plat.h"
 #include "render.h"
+#include "torus.h"
 
 #include <stdio.h>
 
+void draw_spinny(Renderer* r, Colour c) {
+	static int a = 0;
+	int y; int x = y = 100 << fbits;
+	x -= sin_table[a & sin_table_mask] * 10;
+	y += cos_table[a & sin_table_mask] * 10;
+	ren_point(r, c, x >> fbits, y >> fbits);
+	a += 20;
+}
+
+void draw_torus(Renderer* r, Colour c) {
+	static int a = 0;
+	const int pc = sizeof torus_points / sizeof *torus_points;
+	int asp = (r->clip.w << fbits) / r->clip.h;
+	int p[4] = { 0, 0, 5 << fbits, f1 };
+	int i;
+	mtx_push_trans(p);
+	mtx_push_rot_x(a);
+	mtx_push_rot_y(a);
+	mtx_push_rot_z(a);
+	for (i = 0; i < pc; i += 3) {
+		vec_cpy(p, &torus_points[i], 3);
+		mtx_apply(mtx_peek(), p);
+		persp(p, asp);
+		ndc2clip((int*)&r->clip, p);
+		ren_point(r, c, p[0], p[1]);
+	}
+	mtx_popn(4);
+	a += 3;
+}
+
 int entrypoint(int argc, const char** argv, Arena* a) {
 	App* app;
 	Renderer r;
@@ -14,6 +46,7 @@ int entrypoint(int argc, const char** argv, Arena* a) {
 	Colour blue = make_aliceblue();
 	(void)argc;
 	(void)argv;
+	init_maths();
 	init_heap(
 		&h,
 		arena_alloc(a, app_memory_size),
@@ -34,6 +67,7 @@ int entrypoint(int argc, const char** argv, Arena* a) {
 				ren_text(&r, blue, 3, 13, buf);
 				sprintf(buf, "MOUSE: %d, %d", app->mx, app->my);
 				ren_text(&r, blue, 3, 23, buf);
+				draw_torus(&r, blue);
 			ren_end(&r);
 			app_end(app);
 			fps_update(&f);
-- 
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