From 93cdca2fd8ae3bf766d6b1584d52fc8012ddc01c Mon Sep 17 00:00:00 2001
From: quou <quou@disroot.org>
Date: Wed, 7 Aug 2024 20:36:46 +1000
Subject: more lighting WIP

---
 map.c | 101 +++++++++++++++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 75 insertions(+), 26 deletions(-)

(limited to 'map.c')

diff --git a/map.c b/map.c
index d1dcbb8..19612bf 100644
--- a/map.c
+++ b/map.c
@@ -86,7 +86,7 @@ int trace_ray(
 		step_ray(&r);
 	}
 end:
-	return vec_dist(w, pos, t, 3) < 100;
+	return vec_dist(w, pos, t, 3) < 2;
 }
 
 void init_tile(Map* m, int tx, int ty, Map_Light_Tile* t) {
@@ -109,6 +109,68 @@ void init_tile(Map* m, int tx, int ty, Map_Light_Tile* t) {
 	}
 }
 
+Colour bake_pixel(
+	Map* m,
+	Colour src,
+	const int* fr,
+	const Map_Light* light,
+	int tx,
+	int ty,
+	int x,
+	int y,
+	int side
+) {
+	int to[3];
+	switch (side) {
+		case 0: /* ceiling */
+			to[0] = (tx + x * 32);
+			to[1] = (ty + y * 32);
+			to[2] = f1;
+			break;
+		case 1: /* floor */
+			to[0] = (tx + x * 32);
+			to[1] = (ty + y * 32);
+			to[2] = 0;
+			break;
+		case 2:
+			to[0] = ty + f1;
+			to[1] = tx + f1 - x * 32;
+			to[2] = f1 - (y * 32);
+			break;
+		case 3:
+			to[0] = ty + x * 32;
+			to[1] = tx + f1;
+			to[2] = f1 - (y * 32);
+			break;
+		case 4:
+			to[0] = tx + f1;
+			to[1] = ty + f1 - x * 32;
+			to[2] = f1 - (y * 32);
+			break;
+		case 5:
+			to[0] = tx + x * 32;
+			to[1] = ty + f1;
+			to[2] = f1 - (y * 32);
+			break;
+		default: return make_white();
+	}
+	if (trace_ray(m, fr, to)) {
+		int w[3];
+		int atten = vec_dist(w, fr, to, 3);
+		atten = mini(
+			(f1 << fbits) / maxi(1, (atten * atten) >> fbits),
+			f1
+		) - 1;
+		atten = (atten * light->brightness) >> fbits;
+		return col_add(src, col_scl(
+			light->c,
+			(unsigned char)(atten / 2)
+		));
+		return make_white();
+	}
+	return src;
+}
+
 void bake_tile(
 	Map* m,
 	int tx,
@@ -116,36 +178,23 @@ void bake_tile(
 	Map_Light_Tile* t,
 	const Map_Light* light
 ) {
-	int i, x, y, fr[3], w[3];
-	Map_Tile wall = map_tilesc(m)[tx + ty * m->w];
+	int i, x, y, fr[3];
 	tx <<= fbits;
 	ty <<= fbits;
 	fr[0] = light->x;
 	fr[1] = light->y;
-	fr[2] = f1/2;
+	fr[2] = light->z;
 	for (i = y = 0; y < map_light_tile_size; y++) {
 		for (x = 0; x < map_light_tile_size; x++, i++) {
-			int to[3];
-			int atten;
-			Colour c;
-			to[0] = tx + x * 32;
-			to[1] = ty + y * 32;
-			to[2] = f1;
-			atten = vec_dist(w, fr, to, 3);
-			atten /= 5;
-			atten = mini(
-				(f1 << fbits) / maxi(1, (atten * atten) >> fbits),
-				f1
-			) - 1;
-			c = col_scl(
-				light->c,
-				(unsigned char)(atten / 2)
-			);
-			if (trace_ray(m, fr, to))
-				t->fragments[i].u = c;
-			to[2] = 0;
-			if (trace_ray(m, fr, to))
-				t->fragments[i].d = c;
+			Map_Fragment* f = &t->fragments[i];
+#define bp(t, s) \
+	f->t = bake_pixel(m, f->t, fr, light, tx, ty, x, y, s);
+				bp(u,       0);
+				bp(d,       1);
+				bp(side[0], 2);
+				bp(side[1], 3);
+				bp(side[2], 4);
+				bp(side[3], 5);
 		}
 	}
 }
@@ -161,7 +210,7 @@ void bake_light(Map* m, const Map_Light* light) {
 }
 
 void bake_map(Map* m) {
-	Map_Light l = { f1 * 3, f1 * 3, f1, { 0xff, 0xff, 0xff, 0xff } };
+	Map_Light l = { f1 * 2 + 100, f1 * 2, f1/4, f1, { 0xff, 0xff, 0xff, 0xff } };
 	bake_light(m, &l);
 }
 
-- 
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