From bb4638a8470b0be2f960709368ec0d360a64f8ac Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Sat, 24 Apr 2021 23:11:26 +0300
Subject: [PATCH] Use RenderTargets in the Sky effect

---
 source/effects/sky.cpp | 16 ++++++----------
 source/effects/sky.h   |  8 +++-----
 2 files changed, 9 insertions(+), 15 deletions(-)

diff --git a/source/effects/sky.cpp b/source/effects/sky.cpp
index 8fa00cfb..c7e74879 100644
--- a/source/effects/sky.cpp
+++ b/source/effects/sky.cpp
@@ -12,8 +12,10 @@ namespace GL {
 Sky::Sky(Resources &resources, Renderable &r, const Light &s):
 	Effect(r),
 	sun(s),
+	transmittance_lookup(128, 64, (RENDER_COLOR, RGB16F)),
 	transmittance_shprog(resources.get<Program>("_sky_transmittance.glsl.shader")),
 	transmittance_lookup_dirty(true),
+	distant(256, 128, (RENDER_COLOR, RGB16F)),
 	distant_shprog(resources.get<Program>("_sky_distant.glsl.shader")),
 	fullscreen_mesh(resources.get<Mesh>("_fullscreen_quad.mesh")),
 	backdrop_shprog(resources.get<Program>("_sky_backdrop.glsl.shader")),
@@ -21,12 +23,6 @@ Sky::Sky(Resources &resources, Renderable &r, const Light &s):
 	wrap_sampler(resources.get<Sampler>("_linear_clamp_v.samp")),
 	rendered(false)
 {
-	transmittance_lookup.storage(RGB16F, 128, 64, 1);
-	transmittance_fbo.attach(COLOR_ATTACHMENT0, transmittance_lookup);
-
-	distant.storage(RGB16F, 256, 128, 1);
-	distant_fbo.attach(COLOR_ATTACHMENT0, distant);
-
 	shdata.uniform("n_steps", 50);
 
 	set_planet(Planet::earth());
@@ -68,14 +64,14 @@ void Sky::setup_frame(Renderer &renderer)
 	if(transmittance_lookup_dirty)
 	{
 		transmittance_lookup_dirty = false;
-		Bind bind_fbo(transmittance_fbo);
+		Bind bind_fbo(transmittance_lookup.get_framebuffer());
 		renderer.set_shader_program(&transmittance_shprog, &shdata);
 		fullscreen_mesh.draw(renderer);
 	}
 
-	Bind bind_fbo(distant_fbo);
+	Bind bind_fbo(distant.get_framebuffer());
 	renderer.set_shader_program(&distant_shprog, &shdata);
-	renderer.set_texture("transmittance_lookup", &transmittance_lookup, &sampler);
+	renderer.set_texture("transmittance_lookup", &transmittance_lookup.get_target_texture(0), &sampler);
 	fullscreen_mesh.draw(renderer);
 
 	renderable.setup_frame(renderer);
@@ -97,7 +93,7 @@ void Sky::render(Renderer &renderer, Tag tag) const
 	Renderer::Push push(renderer);
 
 	renderer.set_shader_program(&backdrop_shprog, &shdata);
-	renderer.set_texture("distant", &distant, &wrap_sampler);
+	renderer.set_texture("distant", &distant.get_target_texture(0), &wrap_sampler);
 	fullscreen_mesh.draw(renderer);
 }
 
diff --git a/source/effects/sky.h b/source/effects/sky.h
index eb4f618d..5cc7bdaa 100644
--- a/source/effects/sky.h
+++ b/source/effects/sky.h
@@ -4,7 +4,7 @@
 #include "effect.h"
 #include "framebuffer.h"
 #include "programdata.h"
-#include "texture2d.h"
+#include "rendertarget.h"
 
 namespace Msp {
 namespace GL {
@@ -42,13 +42,11 @@ public:
 
 private:
 	const Light &sun;
-	Texture2D transmittance_lookup;
+	RenderTarget transmittance_lookup;
 	const Program &transmittance_shprog;
-	Framebuffer transmittance_fbo;
 	bool transmittance_lookup_dirty;
-	Texture2D distant;
+	RenderTarget distant;
 	const Program &distant_shprog;
-	Framebuffer distant_fbo;
 	const Mesh &fullscreen_mesh;
 	const Program &backdrop_shprog;
 	const Sampler &sampler;
-- 
2.45.2