From b0a5f59fe3bea9aab8f52016a90b6cbbcaea4571 Mon Sep 17 00:00:00 2001
From: quou <quou@disroot.org>
Date: Sun, 4 Aug 2024 15:34:05 +1000
Subject: WIP lightmap baking

---
 render.c | 35 +++++++++++++++++++++++++++++++----
 1 file changed, 31 insertions(+), 4 deletions(-)

(limited to 'render.c')

diff --git a/render.c b/render.c
index 3e5758b..f50dd04 100644
--- a/render.c
+++ b/render.c
@@ -785,12 +785,29 @@ void ren_map(
 			int t = ((2 * x) << (fbits * 2)) / w - f1;
 			int coordc = x + y * r->vp[0];
 			int coordf = x + ((hhi - y) + hhi) * r->vp[0];
-			int ifloor[2];
+			int ifloor[2], mc[2];
+			const Map_Fragment* light;
+			Colour c;
 			t = (t + f1) / 2;
 			ifloor[0] = floor[0] + ((t * (floor[2] - floor[0])) >> fbits);
 			ifloor[1] = floor[1] + ((t * (floor[3] - floor[1])) >> fbits);
-			r->t[coordc] = sample_tex(ceiling, ifloor[0], ifloor[1]);
-			r->t[coordf] = sample_tex(floort,  ifloor[0], ifloor[1]);
+			mc[0] = ifloor[0] >> fbits;
+			mc[1] = ifloor[1] >> fbits;
+			if (mc[0] < 0) continue;
+			if (mc[1] < 0) continue;
+			if (mc[0] >= map->w) continue;
+			if (mc[1] >= map->h) continue;
+			light = sample_map_light(
+				map,
+				mc[0],
+				mc[1],
+				ifloor[0],
+				ifloor[1]
+			);
+			c = sample_tex(ceiling, ifloor[0], ifloor[1]);
+			r->t[coordc] = col_mul(c, light->u);
+			c = sample_tex(floort, ifloor[0], ifloor[1]);
+			r->t[coordf] = col_mul(c, light->d);
 		}
 	}
 	for (x = r->clip[0]; x < r->clip[2]; x++) {
@@ -819,17 +836,19 @@ void ren_map(
 			dside[1] = (((mp[1] << fbits) + f1 - pos[1]) * delta[1]) >> fbits;
 		}
 		while (1) {
-			int dist, u;
+			int dist, u, side;
 			if (dside[0] < dside[1]) {
 				dside[0] += delta[0];
 				mp[0] += step[0];
 				dist = dside[0] - delta[0];
 				u = pos[1] + ((dist * d[1]) >> fbits);
+				side = d[0] < 0;
 			} else {
 				dside[1] += delta[1];
 				mp[1] += step[1];
 				dist = dside[1] - delta[1];
 				u = pos[0] + ((dist * d[0]) >> fbits);
+				side = 2 + (d[1] < 0);
 			}
 			if (mp[0] < 0) break;
 			if (mp[1] < 0) break;
@@ -845,6 +864,14 @@ void ren_map(
 					int coord = x + y * r->vp[0];
 					int v = ((y - sy) << fbits) / (ey - sy);
 					Colour c = sample_tex(texture, u, v);
+					const Map_Fragment* light = sample_map_light(
+						map,
+						mp[0],
+						mp[1],
+						u,
+						v
+					);
+					c = col_mul(c, light->side[side]);
 					r->d[coord] = dist;
 					r->t[coord] = c;
 				}
-- 
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