From 65c0f5ae4a9fb290239f2407b58bf0b893126a2e Mon Sep 17 00:00:00 2001
From: xkamikoo <58092037+xkamikoo@users.noreply.github.com>
Date: Sun, 24 Jan 2021 01:02:35 +0100
Subject: [PATCH] shaders for bloom (i'm working on it!)

---
 grk-project.vcxproj         |  8 +++---
 grk-project.vcxproj.filters |  6 +++++
 shaders/shader_bloom.frag   | 50 +++++++++++++++++++++++++++++++++++++
 shaders/shader_bloom.vert   | 22 ++++++++++++++++
 4 files changed, 83 insertions(+), 3 deletions(-)
 create mode 100644 shaders/shader_bloom.frag
 create mode 100644 shaders/shader_bloom.vert

diff --git a/grk-project.vcxproj b/grk-project.vcxproj
index 9bed514..09917c8 100644
--- a/grk-project.vcxproj
+++ b/grk-project.vcxproj
@@ -15,6 +15,8 @@
     <None Include="shaders\shader_4_sun.vert" />
     <None Include="shaders\shader_4_tex.frag" />
     <None Include="shaders\shader_4_tex.vert" />
+    <None Include="shaders\shader_bloom.frag" />
+    <None Include="shaders\shader_bloom.vert" />
     <None Include="shaders\shader_color.frag" />
     <None Include="shaders\shader_color.vert" />
     <None Include="shaders\shader_skybox.frag" />
@@ -47,7 +49,7 @@
     <ProjectGuid>{1B448102-E76C-4347-BDC7-40D02A567DB6}</ProjectGuid>
     <Keyword>Win32Proj</Keyword>
     <RootNamespace>grk-cw9</RootNamespace>
-    <WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
+    <WindowsTargetPlatformVersion>10.0.17134.0</WindowsTargetPlatformVersion>
     <ProjectName>grk-project</ProjectName>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
@@ -55,14 +57,14 @@
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v142</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v142</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/grk-project.vcxproj.filters b/grk-project.vcxproj.filters
index 0110884..af35209 100644
--- a/grk-project.vcxproj.filters
+++ b/grk-project.vcxproj.filters
@@ -48,6 +48,12 @@
     <None Include="shaders\shader_skybox.vert">
       <Filter>Shader Files</Filter>
     </None>
+    <None Include="shaders\shader_bloom.frag">
+      <Filter>Shader Files</Filter>
+    </None>
+    <None Include="shaders\shader_bloom.vert">
+      <Filter>Shader Files</Filter>
+    </None>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="src\Box.cpp">
diff --git a/shaders/shader_bloom.frag b/shaders/shader_bloom.frag
new file mode 100644
index 0000000..f7d6ce8
--- /dev/null
+++ b/shaders/shader_bloom.frag
@@ -0,0 +1,50 @@
+#version 430 core
+layout (location = 0) out vec4 fragColor;
+layout (location = 1) out vec4 BrightColor;
+
+in vec3 fragPos;
+in vec3 interpNormal;
+in vec2 vTexCoords;
+
+struct PointLight {
+    vec3 position;
+    vec3 color;
+};
+
+#define NR_POINT_LIGHTS 2
+
+uniform vec3 objectColor;
+uniform vec3 lightPos;
+uniform vec3 cameraPos;
+uniform sampler2D colorTexture;
+uniform PointLight pointLights[NR_POINT_LIGHTS];
+
+void main()
+{           
+	vec3 result = vec3(0,0,0);
+	vec4 textureColor = texture2D(colorTexture, -vTexCoords);
+	vec4 ambient = vec4(0.1, 0.1, 0.1, 1.0) * textureColor;
+	vec3 normal = normalize(interpNormal);
+	for(int i = 0; i < NR_POINT_LIGHTS; i++)
+	{
+		vec3 lightDir = normalize(pointLights[i].position - fragPos);
+	
+		vec3 V = normalize(cameraPos-fragPos);
+		vec3 R = reflect(-normalize(lightDir),normal);
+	
+		float specular = pow(max(0,dot(R,V)),10);
+		float diffuse = max(0,dot(normal,normalize(lightDir)));
+		vec3 texture = vec3(textureColor.x, textureColor.y, textureColor.z) * pointLights[i].color;
+		result += mix(texture,texture*diffuse+vec3(1)*specular,0.9);
+	}
+
+	result = (fragColor + ambient).xyz;
+    
+	// check whether result is higher than some threshold, if so, output as bloom threshold color
+    float brightness = dot(result, vec3(0.2126, 0.7152, 0.0722));
+    if(brightness > 1.0)
+        BrightColor = vec4(result, 1.0);
+    else
+        BrightColor = vec4(0.0, 0.0, 0.0, 1.0);
+    fragColor = vec4(result, 1.0);
+}
\ No newline at end of file
diff --git a/shaders/shader_bloom.vert b/shaders/shader_bloom.vert
new file mode 100644
index 0000000..fb0bd99
--- /dev/null
+++ b/shaders/shader_bloom.vert
@@ -0,0 +1,22 @@
+#version 330 core
+layout (location = 0) in vec3 vertexPosition;
+layout (location = 1) in vec3 vertexNormal;
+layout (location = 2) in vec2 vertexTexCoords;
+
+out vec3 fragPos;
+out vec3 interpNormal;
+out vec2 vTexCoords;
+
+uniform mat4 transformation;
+uniform mat4 matrixModel;
+
+void main()
+{
+    fragPos = vec3(matrixModel * vec4(vertexPosition, 1.0));   
+    vTexCoords = vertexTexCoords;
+        
+    mat3 normalMatrix = transpose(inverse(mat3(matrixModel)));
+    interpNormal = normalize(normalMatrix * vertexNormal);
+    
+    gl_Position = transformation * matrixModel * vec4(vertexPosition, 1.0);
+}
\ No newline at end of file