From 8bc4970d3459c5b49b31ce3c1427f2cf2ca5af06 Mon Sep 17 00:00:00 2001
From: Michele Rossi <m.rossi@jmpgames.it>
Date: Thu, 28 May 2026 00:12:26 +0200
Subject: [PATCH] Add shaders pre-warming

---
 core/shader_warmup.gd     | 74 +++++++++++++++++++++++++++++++++++++++
 core/shader_warmup.gd.uid |  1 +
 project.godot             |  1 +
 3 files changed, 76 insertions(+)
 create mode 100644 core/shader_warmup.gd
 create mode 100644 core/shader_warmup.gd.uid

diff --git a/core/shader_warmup.gd b/core/shader_warmup.gd
new file mode 100644
index 0000000..014a31a
--- /dev/null
+++ b/core/shader_warmup.gd
@@ -0,0 +1,74 @@
+extends Node
+## Autoload — pre-warms custom shaders on startup by rendering each
+## ShaderMaterial once in a hidden 64×64 viewport.
+##
+## StandardMaterial3D is covered by ubershaders (already enabled).
+## This catches the custom .gdshader materials that ubershaders miss.
+
+# Paths to all ShaderMaterial .tres files with custom shaders
+const MATERIAL_PATHS: Array[String] = [
+	"res://core/daynight/environment_dust_material.tres",
+	"res://core/daynight/environment_shadows.tres",
+	"res://core/daynight/godrays.tres",
+	"res://core/daynight/weather_overlay.tres",
+	"res://core/daynight/weather_plain_shader.tres",
+	"res://core/biome_generator/wires.tres",
+	"res://tgcc/chunk/prop/grass/grass_chunk.tres",
+	"res://tgcc/chunk/prop/grass/grass_chunk_weeds.tres",
+	"res://tgcc/chunk/prop/grass/grass_chunk_weeds2.tres",
+	"res://tgcc/chunk/prop/grass/grass_bank.tres",
+	"res://tgcc/chunk/prop/tree/leaves_tree1.tres",
+	"res://tgcc/chunk/prop/tree/leaves_tree_small.tres",
+	"res://tgcc/chunk/prop/tree/trunk.tres",
+	"res://tgcc/chunk/prop/flower/flower.tres",
+	"res://tgcc/chunk/prop/flower/bush.tres",
+	"res://tgcc/chunk/prop/house/house_emissiv.tres",
+	"res://tgcc/chunk/prop/tenda noren/tenda.tres",
+	"res://tgcc/chunk/prop/Tori/Tori.tres",
+	"res://tgcc/chunk/prop/zen garden/zengardenCircle.tres",
+	"res://tgcc/chunk/prop/zen garden/zengarden.tres",
+]
+
+
+func _ready() -> void:
+	await get_tree().process_frame
+	warmup()
+
+
+func warmup() -> void:
+	var valid: Array[ShaderMaterial] = []
+	for path in MATERIAL_PATHS:
+		if not ResourceLoader.exists(path):
+			continue
+		var mat := load(path)
+		if mat is ShaderMaterial:
+			valid.append(mat)
+
+	if valid.is_empty():
+		return
+
+	print("[ShaderWarmup] Pre-warming %d custom ShaderMaterials..." % valid.size())
+
+	# Tiny hidden viewport — 64×64 is cheap to render
+	var vp := SubViewport.new()
+	vp.size = Vector2i(64, 64)
+	vp.render_target_update_mode = SubViewport.UPDATE_ALWAYS
+	add_child(vp)
+
+	var cam := Camera3D.new()
+	cam.current = true
+	cam.environment = null
+	vp.add_child(cam)
+
+	var quad := MeshInstance3D.new()
+	quad.mesh = QuadMesh.new()
+	quad.mesh.size = Vector2(1, 1)
+	quad.position = Vector3(0, 0, -2)
+	cam.add_child(quad)
+
+	for mat in valid:
+		quad.material_override = mat
+		await get_tree().process_frame  # one frame renders the quad with this material
+
+	vp.queue_free()
+	print("[ShaderWarmup] Done.")
diff --git a/core/shader_warmup.gd.uid b/core/shader_warmup.gd.uid
new file mode 100644
index 0000000..12c0bed
--- /dev/null
+++ b/core/shader_warmup.gd.uid
@@ -0,0 +1 @@
+uid://d16jx65gmy20b
diff --git a/project.godot b/project.godot
index 8e85bf5..01a5eea 100644
--- a/project.godot
+++ b/project.godot
@@ -23,6 +23,7 @@ GameState="*uid://b17g2w2g101o6"
 CollectionManager="*uid://c3kq1qddpm8tf"
 AudioManager="*uid://dcttbbavtwtsg"
 SceneManager="*uid://bw8hwkw55j675"
+ShaderWarmup="res://core/shader_warmup.gd"
 
 [display]