From 93a5385cb03482d09108edef1433a9f470bf1e4a Mon Sep 17 00:00:00 2001
From: LaG1924 <lag1924@gmail.com>
Date: Sun, 5 Dec 2021 04:26:50 +0500
Subject: Added SSAO blur

---
 cwd/assets/altcraft/shaders/frag/blur.fs  | 22 ++++++++++++++++++++++
 cwd/assets/altcraft/shaders/frag/light.fs |  3 ++-
 src/RenderConfigs.cpp                     | 20 +++++++++++++++++++-
 src/RenderConfigs.hpp                     |  3 +++
 4 files changed, 46 insertions(+), 2 deletions(-)
 create mode 100644 cwd/assets/altcraft/shaders/frag/blur.fs

diff --git a/cwd/assets/altcraft/shaders/frag/blur.fs b/cwd/assets/altcraft/shaders/frag/blur.fs
new file mode 100644
index 0000000..b49032f
--- /dev/null
+++ b/cwd/assets/altcraft/shaders/frag/blur.fs
@@ -0,0 +1,22 @@
+#version 330 core
+
+out vec4 fragColor;
+
+in vec2 uv;
+
+uniform sampler2D blurInput;
+uniform int blurScale;
+
+void main() {
+    vec2 texelSize = 1.0f / vec2(textureSize(blurInput, 0));
+    vec4 result = vec4(0.0f);
+    for (int x = -blurScale; x < blurScale; x++) 
+    {
+        for (int y = -blurScale; y < blurScale; y++) 
+        {
+            vec2 offset = vec2(float(x), float(y)) * texelSize;
+            result += texture(blurInput, uv + offset);
+        }
+    }
+    fragColor = result / pow(blurScale, 3);
+}
diff --git a/cwd/assets/altcraft/shaders/frag/light.fs b/cwd/assets/altcraft/shaders/frag/light.fs
index fd7aa4e..8556770 100644
--- a/cwd/assets/altcraft/shaders/frag/light.fs
+++ b/cwd/assets/altcraft/shaders/frag/light.fs
@@ -41,10 +41,11 @@ void main() {
     float skyLight = l.g;
     float lightLevel = clamp(faceLight + skyLight * dayTime, 0.01f, 1.0f);
     lightLevel = pow(lightLevel, 3);
+    lightLevel *= (1.0f - s.r);
     lightLevel = clamp(lightLevel, 0.005f, 1.0f);
     vec3 faceColor = mix(ac.rgb * lightLevel, vec3(1,1,1) * lightLevel, float(ac.rgb == vec3(0,0,0)));
 
-    vec4 finalColor = vec4(c.rgb * faceColor * (1.0f - s.r), 1.0f);
+    vec4 finalColor = vec4(c.rgb * faceColor, 1.0f);
 
     finalColor.rgb = pow(finalColor.rgb, vec3(1.0f / gamma));
 
diff --git a/src/RenderConfigs.cpp b/src/RenderConfigs.cpp
index d185c79..88166a5 100644
--- a/src/RenderConfigs.cpp
+++ b/src/RenderConfigs.cpp
@@ -155,6 +155,24 @@ Gbuffer::Gbuffer(size_t geomW, size_t geomH, size_t lightW, size_t lightH) {
         Gal::Format::R8G8B8A8,
         Gal::Filtering::Bilinear);
 
+    std::vector<std::pair<std::string_view, std::shared_ptr<Gal::Texture>>> ssaoBlurTextures = {
+        {"blurInput", ssaoPass->GetResultTexture()},
+    };
+
+    std::vector<std::pair<std::string_view, Gal::Type>> ssaoBlurParameters = {
+        {"blurScale", Gal::Type::Int32},
+    };
+
+    ssaoBlurPass = std::make_unique<PostProcess>(LoadPixelShader("/altcraft/shaders/frag/blur"),
+        ssaoBlurTextures,
+        ssaoBlurParameters,
+        lightW,
+        lightH,
+        Gal::Format::R8G8B8A8,
+        Gal::Filtering::Bilinear);
+
+    ssaoBlurPass->SetShaderParameter("blurScale", 2);
+
     std::vector<std::pair<std::string_view, Gal::Type>> lightingParameters = {
         {"renderBuff", Gal::Type::Int32},
     };
@@ -166,7 +184,7 @@ Gbuffer::Gbuffer(size_t geomW, size_t geomH, size_t lightW, size_t lightH) {
         {"worldPos", worldPos},
         {"addColor", addColor},
         {"light", light},
-        {"ssao", ssaoPass->GetResultTexture()},
+        {"ssao", ssaoBlurPass->GetResultTexture()},
     };
 
     lightingPass = std::make_unique<PostProcess>(LoadPixelShader("/altcraft/shaders/frag/light"),
diff --git a/src/RenderConfigs.hpp b/src/RenderConfigs.hpp
index ef4c97d..0667bbe 100644
--- a/src/RenderConfigs.hpp
+++ b/src/RenderConfigs.hpp
@@ -62,6 +62,7 @@ public:
 class Gbuffer {
     std::shared_ptr<Gal::Texture> ssaoNoise;
     std::unique_ptr<PostProcess> ssaoPass;
+    std::unique_ptr<PostProcess> ssaoBlurPass;
     std::unique_ptr<PostProcess> lightingPass;
     std::shared_ptr<Gal::Texture> depthStencil;
     std::shared_ptr<Gal::Texture> color; //RGB - color
@@ -84,12 +85,14 @@ public:
 
     void Render() {
         ssaoPass->Render();
+        ssaoBlurPass->Render();
         lightingPass->Render();
     }
 
     void Clear() {
         geomFramebuffer->Clear();
         ssaoPass->Clear();
+        ssaoBlurPass->Clear();
         lightingPass->Clear();
     }
 
-- 
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