From 5c47ad5aaeb8a51bdb9089d4ea7264b34fa0fdfa Mon Sep 17 00:00:00 2001
From: kichikuou <KichikuouChrome@gmail.com>
Date: Sun, 7 Jun 2026 08:06:01 +0900
Subject: [PATCH] SealEngine: Implement ZWrite .opr attribute

---
 src/3d/3d_internal.h | 1 +
 src/3d/parser.c      | 9 +++++++++
 src/3d/renderer.c    | 4 ++++
 3 files changed, 14 insertions(+)

diff --git a/src/3d/3d_internal.h b/src/3d/3d_internal.h
index 131f199..cddaedd 100644
--- a/src/3d/3d_internal.h
+++ b/src/3d/3d_internal.h
@@ -664,6 +664,7 @@ enum mesh_flags {
 	MESH_NO_HEIGHT_DETECTION = 1 << 7,
 	MESH_ALPHA               = 1 << 8,
 	MESH_HAS_LIGHT_UV        = 1 << 9,
+	MESH_NO_ZWRITE           = 1 << 10,
 };
 
 struct pol_mesh {
diff --git a/src/3d/parser.c b/src/3d/parser.c
index 08eba45..7cce082 100644
--- a/src/3d/parser.c
+++ b/src/3d/parser.c
@@ -620,6 +620,15 @@ void opr_load(uint8_t *data, size_t size, struct pol *pol)
 			} else {
 				WARNING("invalid HeightDetection: %s", s);
 			}
+		} else if (sscanf(line, "ZWrite = %s", s) == 1) {
+			if (!strcmp(s, "false")) {
+				for (int i = 0; i < pol->nr_meshes; i++) {
+					if (!selected[i]) continue;
+					pol->meshes[i]->flags |= MESH_NO_ZWRITE;
+				}
+			} else if (strcmp(s, "true")) {
+				WARNING("invalid ZWrite: %s", s);
+			}
 		} else if (sscanf(line, "UVScroll = ( %f , %f )", &f1, &f2) == 2) {
 			for (int i = 0; i < pol->nr_meshes; i++) {
 				if (!selected[i]) continue;
diff --git a/src/3d/renderer.c b/src/3d/renderer.c
index 2948fa5..4077a5f 100644
--- a/src/3d/renderer.c
+++ b/src/3d/renderer.c
@@ -506,12 +506,16 @@ static void render_model(struct RE_instance *inst, struct RE_renderer *r, enum d
 
 		if (mesh->flags & MESH_BOTH)
 			glDisable(GL_CULL_FACE);
+		if (mesh->flags & MESH_NO_ZWRITE)
+			glDepthMask(GL_FALSE);
 
 		if (mesh->nr_indices)
 			glDrawElements(GL_TRIANGLES, mesh->nr_indices, GL_UNSIGNED_SHORT, NULL);
 		else
 			glDrawArrays(GL_TRIANGLES, 0, mesh->nr_vertices);
 
+		if (mesh->flags & MESH_NO_ZWRITE)
+			glDepthMask(GL_TRUE);
 		if (mesh->flags & MESH_BOTH)
 			glEnable(GL_CULL_FACE);
 		glBindVertexArray(0);