From 863b251903cfdfd5f698251e5aa07ce6c87d877a Mon Sep 17 00:00:00 2001
From: lisyarus <lisyarus@gmail.com>
Date: Fri, 15 Jan 2021 17:56:56 +0300
Subject: [PATCH] Support setting volume data size in cloud example

---
 examples/cloud.cpp | 25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)

diff --git a/examples/cloud.cpp b/examples/cloud.cpp
index bf5767b6..41a6605c 100644
--- a/examples/cloud.cpp
+++ b/examples/cloud.cpp
@@ -21,8 +21,11 @@
 #include <psemek/random/uniform_sphere.hpp>
 #include <psemek/util/range.hpp>
 #include <psemek/util/clock.hpp>
+#include <psemek/util/to_string.hpp>
 #include <psemek/async/threadpool.hpp>
 
+#include <iostream>
+
 using namespace psemek;
 
 template <typename Iterator>
@@ -164,7 +167,7 @@ struct cloud_app
 
 	float step;
 
-	float max_density = 6.f;
+	float max_density = 2.f;
 	geom::interval<float> harmonic_range;
 
 	util::clock<std::chrono::duration<float>> clock;
@@ -187,10 +190,9 @@ struct cloud_app
 	gfx::texture_3d cloud_texture;
 	gfx::texture_3d shadow_texture;
 
-	cloud_app()
+	cloud_app(std::size_t size)
 		: app::app("Cloud")
 	{
-		std::size_t size = 32;
 		geom::vector<int, 3> cloud_size{2 * size, size, size};
 		bbox = {{{-2.f, 2.f}, {-1.f, 1.f}, {-1.f, 1.f}}};
 
@@ -243,7 +245,7 @@ struct cloud_app
 
 			// can't use template argument deduction for first argument due to gcc bug
 			// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89062
-			geom::gradient<float> g(std::make_pair(0.2f, 0.f), geom::easing_type::cubic, std::pair{0.4f, max_density});
+			geom::gradient<float> g(std::make_pair(0.2f, 0.f), geom::easing_type::quadratic_out, std::pair{0.3f, max_density});
 
 			util::array<std::uint8_t, 3> cloud_data({cloud_size[0], cloud_size[1], cloud_size[2]});
 
@@ -590,7 +592,18 @@ struct cloud_app
 	}
 };
 
-int main()
+int main(int argc, char ** argv)
 {
-	return app::main<cloud_app>();
+	if (argc != 1 && argc != 2)
+	{
+		std::cout << "Usage: " << argv[0] << " [ size ]\n";
+		return 0;
+	}
+
+	std::size_t size = 32;
+	if (argc == 2)
+	{
+		size = util::from_string<std::size_t>(argv[1]);
+	}
+	return app::main<cloud_app>(size);
 }