From b9c20fccac64e7aadd28ea6c621c4ffda2561c54 Mon Sep 17 00:00:00 2001
From: hachem <im@hachem.wtf>
Date: Fri, 22 Aug 2025 04:48:42 +0200
Subject: [add]: add bloom and blur

---
 src/Engine/Engine.cpp | 19 +++++++++++++++++++
 src/Engine/Engine.h   | 12 +++++++++++-
 2 files changed, 30 insertions(+), 1 deletion(-)

(limited to 'src/Engine')

diff --git a/src/Engine/Engine.cpp b/src/Engine/Engine.cpp
index 37cafd8..20a295f 100644
--- a/src/Engine/Engine.cpp
+++ b/src/Engine/Engine.cpp
@@ -34,6 +34,7 @@ namespace Donut
 
         m_ShaderProgram  = Ref<Shader>(Shader::Create("Assets/Shaders/ComputeTextureQuad.glsl"));
         m_ComputeProgram = CreateComputeProgram("Assets/Shaders/Geodesic.glsl");
+        m_BlurShader     = Ref<Shader>(Shader::Create("Assets/Shaders/Blur.glsl"));
         
         m_CameraUBO = UniformBuffer::Create(128, 1);
         m_DiskUBO   = UniformBuffer::Create(sizeof(float) * 5, 2);  // Added density parameter
@@ -96,6 +97,24 @@ namespace Donut
         RenderCommand::EnableDepthTest();
     }
 
+    void Engine::DrawBlurPass()
+    {
+        RenderCommand::SetViewport(0, 0, m_Width, m_Height);
+        
+        m_BlurShader->Bind();
+        m_QuadVAO->Bind();
+
+        m_Texture->Bind(0);
+        m_BlurShader->SetInt("u_ScreenTexture", 0);
+        m_BlurShader->SetFloat2("u_Resolution", glm::vec2(m_Width, m_Height));
+        m_BlurShader->SetFloat("u_BlurStrength", m_BlurStrength);
+        m_BlurShader->SetFloat("u_GlowIntensity", m_GlowIntensity);
+
+        RenderCommand::DisableDepthTest();
+        RenderCommand::DrawArrays(6);
+        RenderCommand::EnableDepthTest();
+    }
+
     void Engine::DispatchCompute(const Camera& cam)
     {
         int cw = GetComputeWidth();
diff --git a/src/Engine/Engine.h b/src/Engine/Engine.h
index a0b25b5..83f0b19 100644
--- a/src/Engine/Engine.h
+++ b/src/Engine/Engine.h
@@ -66,6 +66,7 @@ namespace Donut
         ~Engine() = default;
 
         void DrawFullScreenQuad();
+        void DrawBlurPass();
         void DispatchCompute(const Camera& cam);
         void UploadCameraUBO(const Camera& cam);
         void UploadObjectsUBO(const std::vector<ObjectData>& objs);
@@ -109,6 +110,12 @@ namespace Donut
         float GetRotationSpeed() const { return m_RotationSpeed; }
         void  SetRotationSpeed(float speed) { m_RotationSpeed = speed; }
         
+        float GetBlurStrength() const { return m_BlurStrength; }
+        void  SetBlurStrength(float strength) { m_BlurStrength = strength; }
+        
+        float GetGlowIntensity() const { return m_GlowIntensity; }
+        void  SetGlowIntensity(float intensity) { m_GlowIntensity = intensity; }
+        
         void LoadObjectsFromScene(const std::vector<Donut::Object>& objects);
         void ExportHighResFrame(const std::string& filename, int width = 4096, int height = 3072);
         void PrintObjectInfo() const;
@@ -120,6 +127,7 @@ namespace Donut
         Ref<Texture2D>     m_Texture;
         Ref<Shader>        m_ShaderProgram;
         Ref<Shader>        m_ComputeProgram;
+        Ref<Shader>        m_BlurShader;
         Ref<UniformBuffer> m_CameraUBO;
         Ref<UniformBuffer> m_DiskUBO;
         Ref<UniformBuffer> m_ObjectsUBO;
@@ -145,7 +153,9 @@ namespace Donut
         float m_EarlyExitDistance = 5e11f;
         
         float m_DiskThickness = 0.1;    
-        float m_DiskDensity   = 1.2f;
+        float m_DiskDensity   = 0.1f;
         float m_RotationSpeed = 1.0f;
+        float m_BlurStrength  = 2.0f;
+        float m_GlowIntensity = 0.1f;
     };
 };
-- 
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