From 3239ba18797b1aa098056aa0c2a70e250a27a06c Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Sun, 24 Oct 2021 13:24:13 +0800
Subject: * port shader

---
 Resources/Scripts/Editor/AssetBrowser.lua |  7 ++-
 Resources/Scripts/EditorApplication.lua   | 90 +++++++++++++++++++++++++++++++
 2 files changed, 95 insertions(+), 2 deletions(-)

(limited to 'Resources/Scripts')

diff --git a/Resources/Scripts/Editor/AssetBrowser.lua b/Resources/Scripts/Editor/AssetBrowser.lua
index 07cead4..ee6de6a 100644
--- a/Resources/Scripts/Editor/AssetBrowser.lua
+++ b/Resources/Scripts/Editor/AssetBrowser.lua
@@ -3,14 +3,17 @@ local AssetBrowser = GameLab.Editor.GUI.EditorWindow.Extend("AssetBrowser", "Gam
 
 AssetBrowser.Ctor = function(self)
 	self.base.Ctor(self, "AssetBrowser")
+	
 end
 
 AssetBrowser.OnGUI = function(self)
-	Debug.Log("AssetBrowser.OnGUI()" .. self.title)
+
+
 end
 
 AssetBrowser.OnFocus = function(self)
-	Debug.Log("AssetBrowser.OnFocus()" .. self.title)
+
+
 end
 
 return AssetBrowser
\ No newline at end of file
diff --git a/Resources/Scripts/EditorApplication.lua b/Resources/Scripts/EditorApplication.lua
index 8a175db..92bc5b9 100644
--- a/Resources/Scripts/EditorApplication.lua
+++ b/Resources/Scripts/EditorApplication.lua
@@ -39,6 +39,96 @@ local V4 = GameLab.Engine.Math.Vector4.Extend("V4", "GameLab.Engine.Math")
 
 Debug.Log(EditorWindowManager.name)
 
+local vert = [[
+	#version 330 core
+	layout (location = 0) in vec3 aPos;
+	layout (location = 1) in vec3 aNormal;
+	layout (location = 2) in vec2 aTexCoords;
+	layout (location = 3) in vec3 aTangent;
+	layout (location = 4) in vec3 aBitangent;
+	
+	out VS_OUT {
+		vec3 FragPos;
+		vec2 TexCoords;
+		vec3 TangentLightPos;
+		vec3 TangentViewPos;
+		vec3 TangentFragPos;
+	} vs_out;
+	
+	uniform mat4 projection;
+	uniform mat4 view;
+	uniform mat4 model;
+	
+	uniform vec3 lightPos;
+	uniform vec3 viewPos;
+	
+	void main()
+	{
+		vs_out.FragPos = vec3(model * vec4(aPos, 1.0));   
+		vs_out.TexCoords = aTexCoords;
+		
+		mat3 normalMatrix = transpose(inverse(mat3(model)));
+		vec3 T = normalize(normalMatrix * aTangent);
+		vec3 N = normalize(normalMatrix * aNormal);
+		T = normalize(T - dot(T, N) * N);
+		vec3 B = cross(N, T);
+		
+		mat3 TBN = transpose(mat3(T, B, N));    
+		vs_out.TangentLightPos = TBN * lightPos;
+		vs_out.TangentViewPos  = TBN * viewPos;
+		vs_out.TangentFragPos  = TBN * vs_out.FragPos;
+			
+		gl_Position = projection * view * model * vec4(aPos, 1.0);
+	}
+]]
+
+local frag = [[
+	#version 330 core
+	out vec4 FragColor;
+	
+	in VS_OUT {
+		vec3 FragPos;
+		vec2 TexCoords;
+		vec3 TangentLightPos;
+		vec3 TangentViewPos;
+		vec3 TangentFragPos;
+	} fs_in;
+	
+	uniform sampler2D diffuseMap;
+	uniform sampler2D normalMap;
+	
+	uniform vec3 lightPos;
+	uniform vec3 viewPos;
+	
+	void main()
+	{           
+		 // obtain normal from normal map in range [0,1]
+		vec3 normal = texture(normalMap, fs_in.TexCoords).rgb;
+		// transform normal vector to range [-1,1]
+		normal = normalize(normal * 2.0 - 1.0);  // this normal is in tangent space
+	   
+		// get diffuse color
+		vec3 color = texture(diffuseMap, fs_in.TexCoords).rgb;
+		// ambient
+		vec3 ambient = 0.1 * color;
+		// diffuse
+		vec3 lightDir = normalize(fs_in.TangentLightPos - fs_in.TangentFragPos);
+		float diff = max(dot(lightDir, normal), 0.0);
+		vec3 diffuse = diff * color;
+		// specular
+		vec3 viewDir = normalize(fs_in.TangentViewPos - fs_in.TangentFragPos);
+		vec3 reflectDir = reflect(-lightDir, normal);
+		vec3 halfwayDir = normalize(lightDir + viewDir);  
+		float spec = pow(max(dot(normal, halfwayDir), 0.0), 32.0);
+	
+		vec3 specular = vec3(0.2) * spec;
+		FragColor = vec4(ambient + diffuse + specular, 1.0);
+	}
+]]
+
+local shader = GameLab.Engine.Rendering.Shader.New(vert, frag)
+Debug.Log("shader is " .. inspect(shader:IsValid()))
+
 while true do 
 
 	app:PullMessage()
-- 
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