From 07b1960d5a76537beb57c2e324d95833104894af Mon Sep 17 00:00:00 2001
From: Emmanuel Benoit <tseeker@nocternity.net>
Date: Sat, 30 Sep 2017 21:37:35 +0200
Subject: [PATCH] Raymarcher controls

---
 main.cc | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/main.cc b/main.cc
index f994cdb..5af1755 100644
--- a/main.cc
+++ b/main.cc
@@ -43,6 +43,13 @@ struct T_Main
 	void render( );
 
 	void initProgram( );
+
+	// FIXME: move
+	int rmIterations = 128;
+	float rmStep = .9;
+	float rmEpsilon = .000001;
+	float rmMaxDist = 50;
+	float epsLog = log( rmEpsilon ) / log( 10 );
 };
 
 /*----------------------------------------------------------------------------*/
@@ -165,6 +172,18 @@ void T_Main::makeUI( )
 	ImGui::Begin( "Yay! Demo!" );
 
 	camera.makeUI( );
+
+	if ( ImGui::CollapsingHeader( "Raymarcher" ) ) {
+		ImGui::DragInt( "Iterations" , &rmIterations , .1 , 1 , 512 );
+		ImGui::DragFloat( "Step" , &rmStep , .005 , .1 , 2 );
+		ImGui::DragFloat( "Max. dist." , &rmMaxDist , .1f ,
+				0.01 , 1000.0 , "%.2f" );
+		if ( ImGui::DragFloat( "Epsilon" , &epsLog , .01f ,
+				-10 , -0.5 , "10 ^ %.2f" ) ) {
+			rmEpsilon = pow( 10 , epsLog );
+		}
+	}
+
 	bloomPass->makeUI( );
 
 	ImGui::End( );
@@ -198,7 +217,8 @@ void T_Main::render( )
 
 		glUniform3f( U_LIGHT_DIR , 0 , 1 , 1 );
 
-		glUniform4f( U_RAYMARCHER , 128 , 0.9 , 0.001 , 100 );
+		glUniform4f( U_RAYMARCHER , rmIterations , rmStep ,
+				rmEpsilon , rmMaxDist );
 
 		glRectf( -1, -1 , 1 , 1 );
 	}