From e5f8bca41c2c19b798552d5b0e3dbd1bb0b1c2be Mon Sep 17 00:00:00 2001
From: vaxerski <43317083+vaxerski@users.noreply.github.com>
Date: Sun, 24 Apr 2022 16:41:01 +0200
Subject: Switched old blur to dual kawase

---
 src/render/Shaders.hpp | 91 ++++++++++----------------------------------------
 1 file changed, 17 insertions(+), 74 deletions(-)

(limited to 'src/render/Shaders.hpp')

diff --git a/src/render/Shaders.hpp b/src/render/Shaders.hpp
index 719c0c4a..b964c8c2 100644
--- a/src/render/Shaders.hpp
+++ b/src/render/Shaders.hpp
@@ -164,46 +164,16 @@ uniform sampler2D tex;
 
 uniform float radius;
 uniform vec2 resolution;
-uniform float alpha;
-
-float SCurve (float x) {
-	x = x * 2.0 - 1.0;
-	return -x * abs(x) * 0.5 + x + 0.5;
-}
-
-vec4 BlurH (vec2 size, vec2 uv) {
-	if (radius >= 1.0) {
-		vec4 A = vec4(0.0); 
-		vec4 C = vec4(0.0); 
-
-		float width = 1.0 / size.x;
-
-		float divisor = 0.0; 
-        float weight = 0.0;
-        
-        float radiusMultiplier = 1.0 / radius;
-        
-		for (float x = -radius; x <= radius; x++) {
-			A = texture2D(tex, uv + vec2(x * width, 0.0));
-            
-            weight = SCurve(1.0 - (abs(x) * radiusMultiplier)); 
-            
-            C += A * weight; 
-            
-			divisor += weight; 
-		}
-
-		return vec4(C.r / divisor, C.g / divisor, C.b / divisor, 1.0);
-	}
-
-	return texture2D(tex, uv);
-}
-
+uniform vec2 halfpixel;
 
 void main() {
-	gl_FragColor = BlurH(resolution, v_texcoord) * alpha;
+    vec4 sum = texture2D(tex, v_texcoord) * 4.0;
+    sum += texture2D(tex, v_texcoord - halfpixel.xy * radius);
+    sum += texture2D(tex, v_texcoord + halfpixel.xy * radius);
+    sum += texture2D(tex, v_texcoord + vec2(halfpixel.x, -halfpixel.y) * radius);
+    sum += texture2D(tex, v_texcoord - vec2(halfpixel.x, -halfpixel.y) * radius);
+    gl_FragColor = sum / 8.0;
 }
-
 )#";
 
 inline const std::string FRAGBLUR2 = R"#(
@@ -213,46 +183,19 @@ uniform sampler2D tex;
 
 uniform float radius;
 uniform vec2 resolution;
-uniform float alpha;
-
-float SCurve (float x) {
-	x = x * 2.0 - 1.0;
-	return -x * abs(x) * 0.5 + x + 0.5;
-}
-
-vec4 BlurV (vec2 size, vec2 uv) {
-	if (radius >= 1.0) {
-		vec4 A = vec4(0.0); 
-		vec4 C = vec4(0.0); 
-
-		float height = 1.0 / size.y;
-
-		float divisor = 0.0; 
-        float weight = 0.0;
-        
-        float radiusMultiplier = 1.0 / radius;
-        
-		for (float y = -radius; y <= radius; y++) {
-			A = texture2D(tex, uv + vec2(0.0, y * height));
-            
-            weight = SCurve(1.0 - (abs(y) * radiusMultiplier)); 
-            
-            C += A * weight; 
-            
-			divisor += weight; 
-		}
-
-		return vec4(C.r / divisor, C.g / divisor, C.b / divisor, 1.0);
-	}
-
-	return texture2D(tex, uv);
-}
-
+uniform vec2 halfpixel;
 
 void main() {
-	gl_FragColor = BlurV(resolution, v_texcoord) * alpha;
+    vec4 sum = texture2D(tex, v_texcoord + vec2(-halfpixel.x * 2.0, 0.0) * radius);
+    sum += texture2D(tex, v_texcoord + vec2(-halfpixel.x, halfpixel.y) * radius) * 2.0;
+    sum += texture2D(tex, v_texcoord + vec2(0.0, halfpixel.y * 2.0) * radius);
+    sum += texture2D(tex, v_texcoord + vec2(halfpixel.x, halfpixel.y) * radius) * 2.0;
+    sum += texture2D(tex, v_texcoord + vec2(halfpixel.x * 2.0, 0.0) * radius);
+    sum += texture2D(tex, v_texcoord + vec2(halfpixel.x, -halfpixel.y) * radius) * 2.0;
+    sum += texture2D(tex, v_texcoord + vec2(0.0, -halfpixel.y * 2.0) * radius);
+    sum += texture2D(tex, v_texcoord + vec2(-halfpixel.x, -halfpixel.y) * radius) * 2.0;
+    gl_FragColor = sum / 12.0;
 }
-
 )#";
 
 inline const std::string TEXFRAGSRCEXT = R"#(
-- 
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