From f4e0bcd917fd4270100e219c5fba7af185060111 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Sat, 8 May 2021 18:41:28 +0300
Subject: [PATCH] Store the ambient occlusion rotate lookup texture in
 resources

---
 source/effects/ambientocclusion.cpp | 28 ++++++++++++++++++++++------
 source/effects/ambientocclusion.h   |  3 ++-
 2 files changed, 24 insertions(+), 7 deletions(-)

diff --git a/source/effects/ambientocclusion.cpp b/source/effects/ambientocclusion.cpp
index bbff1f25..b4050aef 100644
--- a/source/effects/ambientocclusion.cpp
+++ b/source/effects/ambientocclusion.cpp
@@ -13,6 +13,7 @@ namespace Msp {
 namespace GL {
 
 AmbientOcclusion::AmbientOcclusion(unsigned w, unsigned h, float):
+	rotate_lookup(get_or_create_rotate_lookup()),
 	occlude_target(w, h, (RENDER_COLOR,R8)),
 	occlude_shader(Resources::get_global().get<Program>("_ambientocclusion_occlude.glsl.shader")),
 	combine_shader(Resources::get_global().get<Program>("_ambientocclusion_combine.glsl.shader")),
@@ -21,8 +22,26 @@ AmbientOcclusion::AmbientOcclusion(unsigned w, unsigned h, float):
 	nearest_clamp_sampler(Resources::get_global().get<Sampler>("_nearest_clamp.samp")),
 	nearest_sampler(Resources::get_global().get<Sampler>("_nearest.samp"))
 {
+	set_n_samples(16);
+	set_occlusion_radius(0.5f);
+	set_darkness(1.0f);
+	set_edge_depth_threshold(0.1f);
+}
+
+const Texture2D &AmbientOcclusion::get_or_create_rotate_lookup()
+{
+	Resources &resources = Resources::get_global();
+
+	static const string name = "_ambientocclusion_rotate.tex2d";
+	Texture2D *rotate_lookup = resources.find<Texture2D>(name);
+	if(rotate_lookup)
+		return *rotate_lookup;
+
+	rotate_lookup = new Texture2D;
+	rotate_lookup->storage(RGBA8, 4, 4, 1);
+	resources.add(name, rotate_lookup);
+
 	unsigned seed = 1;
-	rotate_lookup.storage(RGBA8, 4, 4, 1);
 	unsigned char data[64];
 	for(unsigned i=0; i<16; ++i)
 	{
@@ -34,12 +53,9 @@ AmbientOcclusion::AmbientOcclusion(unsigned w, unsigned h, float):
 		data[i*4+2] = 255-s;
 		data[i*4+3] = ((i+i/4)%2)*255;
 	}
-	rotate_lookup.image(0, data);
+	rotate_lookup->image(0, data);
 
-	set_n_samples(16);
-	set_occlusion_radius(0.5f);
-	set_darkness(1.0f);
-	set_edge_depth_threshold(0.1f);
+	return *rotate_lookup;
 }
 
 float AmbientOcclusion::random(unsigned &seed)
diff --git a/source/effects/ambientocclusion.h b/source/effects/ambientocclusion.h
index 71a92703..61d4d4f3 100644
--- a/source/effects/ambientocclusion.h
+++ b/source/effects/ambientocclusion.h
@@ -39,7 +39,7 @@ public:
 	};
 
 private:
-	Texture2D rotate_lookup;
+	const Texture2D &rotate_lookup;
 	RenderTarget occlude_target;
 	const Program &occlude_shader;
 	const Program &combine_shader;
@@ -53,6 +53,7 @@ public:
 	AmbientOcclusion(unsigned, unsigned, float = 1.0f);
 
 private:
+	static const Texture2D &get_or_create_rotate_lookup();
 	static float random(unsigned &);
 
 public:
-- 
2.43.0