From 724bbcdfdd5166ae07099bacc82d66973583bc37 Mon Sep 17 00:00:00 2001
From: kichikuou <KichikuouChrome@gmail.com>
Date: Tue, 20 May 2025 15:05:51 +0900
Subject: [PATCH] 3d: Disable light mapping for meshes without light_uv

---
 src/3d/3d_internal.h | 1 +
 src/3d/parser.c      | 1 +
 src/3d/renderer.c    | 2 +-
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/3d/3d_internal.h b/src/3d/3d_internal.h
index a7c1677..4175210 100644
--- a/src/3d/3d_internal.h
+++ b/src/3d/3d_internal.h
@@ -438,6 +438,7 @@ enum mesh_flags {
 	MESH_NO_EDGE             = 1 << 6,
 	MESH_NO_HEIGHT_DETECTION = 1 << 7,
 	MESH_ALPHA               = 1 << 8,
+	MESH_HAS_LIGHT_UV        = 1 << 9,
 };
 
 struct pol_mesh {
diff --git a/src/3d/parser.c b/src/3d/parser.c
index cec10a4..207c9f7 100644
--- a/src/3d/parser.c
+++ b/src/3d/parser.c
@@ -218,6 +218,7 @@ static struct pol_mesh *parse_mesh(struct buffer *r, const struct pol *pol)
 
 	mesh->nr_light_uvs = buffer_read_int32(r);
 	if (mesh->nr_light_uvs > 0) {
+		mesh->flags |= MESH_HAS_LIGHT_UV;
 		mesh->light_uvs = xcalloc(mesh->nr_light_uvs, sizeof(vec2));
 		for (uint32_t i = 0; i < mesh->nr_light_uvs; i++) {
 			mesh->light_uvs[i][0] = buffer_read_float(r);
diff --git a/src/3d/renderer.c b/src/3d/renderer.c
index 750d9ad..78b053c 100644
--- a/src/3d/renderer.c
+++ b/src/3d/renderer.c
@@ -401,7 +401,7 @@ static void render_model(struct RE_instance *inst, struct RE_renderer *r, enum d
 			glUniform1i(r->diffuse_type, DIFFUSE_ENV_MAP);
 		} else if (mesh->flags & MESH_NOLIGHTING) {
 			glUniform1i(r->diffuse_type, DIFFUSE_EMISSIVE);
-		} else if (material->light_map && inst->plugin->light_map_mode) {
+		} else if (material->light_map && mesh->flags & MESH_HAS_LIGHT_UV && inst->plugin->light_map_mode) {
 			glUniform1i(r->diffuse_type, DIFFUSE_LIGHT_MAP);
 			glActiveTexture(GL_TEXTURE0 + LIGHT_TEXTURE_UNIT);
 			glBindTexture(GL_TEXTURE_2D, material->light_map);