From e6f8a3356a91e0304e9965c7b8bfc2f06a2b79cc Mon Sep 17 00:00:00 2001
From: quou <quou@disroot.org>
Date: Sat, 6 Jul 2024 17:55:46 +1000
Subject: Triangle fill.

---
 3de.c | 39 +++++++++++++++++++++++++++++----------
 1 file changed, 29 insertions(+), 10 deletions(-)

(limited to '3de.c')

diff --git a/3de.c b/3de.c
index 6bf9e33..8af3d18 100644
--- a/3de.c
+++ b/3de.c
@@ -20,29 +20,42 @@ 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;
+	int p[4 * 3] = { 0, 0, 5 << fbits, f1, 0, 0, 0, f1, 0, 0, 0, f1 }, * wp;
+	int i, j;
 	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]);
+	for (i = 0; i < pc; i += 9) {
+		for (j = 0; j < 3; j++) {
+			wp = &p[j * 4];
+			vec_cpy(wp, &torus_points[i + j * 3], 3);
+			mtx_apply(mtx_peek(), wp);
+			persp(wp, asp);
+			ndc2clip((int*)&r->clip, wp);
+		}
+		ren_tri(r, c, &p[0], &p[4], &p[8], tri_mode_flat);
 	}
 	mtx_popn(4);
 	a += 3;
 }
 
+void draw_tri(Renderer* r, Colour c, int x, int y) {
+	int v0[] = { 100, 100 };
+	int v1[] = { 0,   0 };
+	int v2[] = { 150, 300 };
+	v1[0] = x;
+	v1[1] = y;
+	ren_tri(r, c, v0, v1, v2, tri_mode_flat);
+}
+
 int entrypoint(int argc, const char** argv, Arena* a) {
 	App* app;
-	Renderer r;
+	Renderer r = { 0 };
 	Heap h;
 	FPS f;
 	char buf[32];
+	int* depth = 0;
 	Colour blue = make_aliceblue();
 	(void)argc;
 	(void)argv;
@@ -55,12 +68,18 @@ int entrypoint(int argc, const char** argv, Arena* a) {
 	app = new_app(&h, 640, 480, "3D Engine");
 	if (!app) return app->err;
 	init_fps(&f, 20);
+	depth = heap_alloc(&h, 3000 * 3000 * sizeof *depth);
+	if (!depth) {
+		print_err("Out of memory.\n");
+		return error_out_of_memory;
+	}
 	while (app->o) {
 		fps_begin(&f);
 		while (f.now >= f.next) {
 			app_begin(app);
-			ren_begin(&r, app->fb, app->w, app->h);
+			ren_begin(&r, app->fb, depth, app->w, app->h);
 				ren_clear(&r);
+				ren_cleard(&r, f1 * 300);
 				sprintf(buf, "FPS: %d", app->fps);
 				ren_text(&r, blue, 3, 3,  buf);
 				sprintf(buf, "CAP: %d", f.fps);
-- 
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