From 0ca64e14cc92b6b664f55a250571bb3749d320b9 Mon Sep 17 00:00:00 2001
From: Hugo Willaume <hugo.willaume@epitech.eu>
Date: Mon, 8 Apr 2019 13:49:26 +0900
Subject: [PATCH] Added refraction to the skybox shader

---
 BaseGLProject/MyGLWindow.cpp |  6 +++---
 BaseGLProject/Shader.h       |  2 +-
 BaseGLProject/Skybox.cpp     |  3 +--
 BaseGLProject/imgui.ini      |  2 +-
 BaseGLProject/skybox.frag    | 13 +++++--------
 BaseGLProject/skybox.vert    |  5 ++++-
 6 files changed, 15 insertions(+), 16 deletions(-)

diff --git a/BaseGLProject/MyGLWindow.cpp b/BaseGLProject/MyGLWindow.cpp
index ba2266c..e1e49cf 100644
--- a/BaseGLProject/MyGLWindow.cpp
+++ b/BaseGLProject/MyGLWindow.cpp
@@ -110,9 +110,9 @@ void MyGlWindow::shaderSetup()
 	shaders["Toon"]->uniformFlags &= ~ShaderFlags::SHINE_FLAG;
 
 	shaders["Skybox"] = new Shader("skybox.vert", "skybox.frag");
-	shaders["Skybox"]->uniformFlags = MVP_FLAG | KA_FLAG | MODEL_MATRIX_FLAG | SKYBOX_TEX_FLAG;
-	shaders["Skybox"]->mat.enabled = true;
-	shaders["Skybox"]->mat.ka = glm::vec3(0.4, 0.4, 0.4);
+	shaders["Skybox"]->uniformFlags = MVP_FLAG | MODEL_MATRIX_FLAG | SKYBOX_TEX_FLAG;
+	shaders["Skybox"]->addUniform("ReflectFactor", (float)0.1);
+	shaders["Skybox"]->addUniform("RefractionIndex", (float)0.95);
 
 }
 
diff --git a/BaseGLProject/Shader.h b/BaseGLProject/Shader.h
index 09fb2d2..c60c641 100644
--- a/BaseGLProject/Shader.h
+++ b/BaseGLProject/Shader.h
@@ -23,7 +23,7 @@ enum ShaderFlags
 	MODELVIEW_FLAG = 64,
 	LIGHTS_FLAG = 128,	
 	MODEL_MATRIX_FLAG = 256,
-	SKYBOX_TEX_FLAG = 512
+	SKYBOX_TEX_FLAG = 512,	
 };
 
 class Shader
diff --git a/BaseGLProject/Skybox.cpp b/BaseGLProject/Skybox.cpp
index 380fcd1..0928a74 100644
--- a/BaseGLProject/Skybox.cpp
+++ b/BaseGLProject/Skybox.cpp
@@ -98,8 +98,7 @@ void Skybox::initialize(std::string skybox_dir, Shader *sky)
 	glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
 	sky->enable();
 	sky->addUniform("DrawSkyBox", (int)GL_FALSE);
-	sky->addUniform("CubeMapTex", (int)0);
-	sky->addUniform("ReflectFactor", (float)0.85);
+	sky->addUniform("CubeMapTex", (int)0);	
 	sky->disable();
 }
 
diff --git a/BaseGLProject/imgui.ini b/BaseGLProject/imgui.ini
index 44dd3c0..cd0131f 100644
--- a/BaseGLProject/imgui.ini
+++ b/BaseGLProject/imgui.ini
@@ -46,5 +46,5 @@ Collapsed=0
 [Window][First Window]
 Pos=20,20
 Size=357,188
-Collapsed=0
+Collapsed=1
 
diff --git a/BaseGLProject/skybox.frag b/BaseGLProject/skybox.frag
index 9ead26f..0fdac0b 100644
--- a/BaseGLProject/skybox.frag
+++ b/BaseGLProject/skybox.frag
@@ -3,21 +3,18 @@
 out vec4 FragColors;
 
 in vec3 reflectDir;
+in vec3 refractDir;
 
-uniform vec3 Ka;
 uniform float ReflectFactor;
 uniform bool DrawSkyBox;
 uniform samplerCube CubeMapTex;
 
-float rand(vec2 co){
-    return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453);
-}
-
 void main()
 { 	
-	vec4 texColor = texture(CubeMapTex, reflectDir);
+	vec4 reflectColor = texture(CubeMapTex, reflectDir);
+	vec4 refractColor = texture(CubeMapTex, refractDir);
 	if (DrawSkyBox == true)
-		FragColors = texColor;
+		FragColors = reflectColor;
 	else	
-		FragColors = vec4(mix(Ka, texColor.xyz, ReflectFactor), 1);	
+		FragColors = vec4(mix(refractColor, reflectColor, ReflectFactor));	
 }
diff --git a/BaseGLProject/skybox.vert b/BaseGLProject/skybox.vert
index 07050f2..b8ba62b 100644
--- a/BaseGLProject/skybox.vert
+++ b/BaseGLProject/skybox.vert
@@ -6,7 +6,9 @@ layout(location=2) in vec3 v_color;
 layout(location=3) in vec2 v_texmap;
 
 out vec3 reflectDir;
+out vec3 refractDir;
 
+uniform float RefractionIndex;
 uniform mat4 ModelMatrix;
 uniform mat4 mvp;
 uniform bool DrawSkyBox;
@@ -17,7 +19,7 @@ void main(void)
 {		
 
 //For drawing a mesh with reflected skybox
-	if (DrawSkyBox == true)
+	if (DrawSkyBox == true)	
 		reflectDir = coord3d;
 	else
 	{
@@ -25,6 +27,7 @@ void main(void)
 		vec3 N = normalize(ModelMatrix * vec4(v_normal, 1)).xyz;
 		vec3 V = normalize(WorldCamPos - coord3d);
 		reflectDir = reflect(-V, N);
+		refractDir = refract(-V, N, RefractionIndex);
 	}
 
 	gl_Position = mvp * vec4(coord3d, 1.0f);