From d32bd63b67fc77e96589c88e389c2644f5dc6660 Mon Sep 17 00:00:00 2001
From: "Eunki, Hong" <eunkiki.hong@samsung.com>
Date: Wed, 4 Sep 2024 17:06:51 +0900
Subject: [PATCH] Minor optimize render-effect shader

Change-Id: Idfa87f93bddf48bba3adac84b96f9a6be984e634
Signed-off-by: Eunki, Hong <eunkiki.hong@samsung.com>
---
 .../internal/graphics/shaders/render-effect.frag   | 42 +++++++++++++---------
 .../internal/graphics/shaders/render-effect.vert   | 16 ++++++---
 2 files changed, 37 insertions(+), 21 deletions(-)

diff --git a/dali-toolkit/internal/graphics/shaders/render-effect.frag b/dali-toolkit/internal/graphics/shaders/render-effect.frag
index 9ad5306..b8a06a8 100644
--- a/dali-toolkit/internal/graphics/shaders/render-effect.frag
+++ b/dali-toolkit/internal/graphics/shaders/render-effect.frag
@@ -1,7 +1,8 @@
 precision highp float;
-varying highp vec2 vFragCoord;
 varying highp vec2 vTexCoord;
+varying highp vec2 vOptRectSize;
 varying highp vec4 vCornerRadius;
+
 uniform highp vec3 uSize;
 uniform sampler2D sTexture;
 
@@ -15,7 +16,7 @@ highp float nrand(const in vec2 uv)
 vec3 applyDithering( vec3 inColor )
 {
   float rnd = nrand(vTexCoord) - 0.5;
-  inColor.rgb += rnd / 255.0;
+  inColor.rgb += rnd * 0.0039215686;
   return inColor;
 }
 
@@ -31,20 +32,27 @@ float roundedBoxSDF(vec2 PixelPositionFromCenter, vec2 RectangleEdgePositionFrom
 void main()
 {
   gl_FragColor = texture2D(sTexture, vTexCoord);
-
-  highp vec2 location = vTexCoord.xy - vec2(0.5);
-  float radius =
-    mix(
-      mix(vCornerRadius.x, vCornerRadius.y, sign(location.x)*0.5 + 0.5),
-      mix(vCornerRadius.w, vCornerRadius.z, sign(location.x)*0.5 + 0.5),
-      sign(location.y) * 0.5 + 0.5
-     );
-
-  float edgeSoftness = min(1.0, radius);
-  float distance = roundedBoxSDF(vFragCoord.xy - (uSize.xy/2.0), uSize.xy/2.0, radius);
-
-  float smoothedAlpha = 1.0 - smoothstep(-edgeSoftness, edgeSoftness, distance);
-  gl_FragColor.a *= smoothedAlpha;
-
   gl_FragColor.rgb = applyDithering(gl_FragColor.rgb);
+
+  highp vec2 location = (vTexCoord.xy - vec2(0.5)) * uSize.xy;
+  // skip most potential calculate for performance
+  if(abs(location.x) < vOptRectSize.x && abs(location.y) < vOptRectSize.y)
+  {
+    // Do nothing.
+  }
+  else
+  {
+    float radius =
+      mix(
+        mix(vCornerRadius.x, vCornerRadius.y, sign(location.x) * 0.5 + 0.5),
+        mix(vCornerRadius.w, vCornerRadius.z, sign(location.x) * 0.5 + 0.5),
+        sign(location.y) * 0.5 + 0.5
+      );
+
+    float edgeSoftness = min(1.0, radius);
+    float distance = roundedBoxSDF(location, uSize.xy * 0.5, radius);
+
+    float smoothedAlpha = 1.0 - smoothstep(-edgeSoftness, edgeSoftness, distance);
+    gl_FragColor.a *= smoothedAlpha;
+  }
 }
diff --git a/dali-toolkit/internal/graphics/shaders/render-effect.vert b/dali-toolkit/internal/graphics/shaders/render-effect.vert
index b8ae74d..c46d0dd 100644
--- a/dali-toolkit/internal/graphics/shaders/render-effect.vert
+++ b/dali-toolkit/internal/graphics/shaders/render-effect.vert
@@ -1,21 +1,29 @@
 precision highp float;
+
 attribute highp vec2 aPosition;
-varying highp vec2 vFragCoord;
+
 varying highp vec2 vTexCoord;
+varying highp vec2 vOptRectSize;
 varying highp vec4 vCornerRadius; //output
+
 uniform highp mat4 uMvpMatrix;
-uniform highp vec3 uSize;
 uniform highp vec4 uCornerRadius; //input
-uniform highp float uCornerRadiusPolicy;
+uniform lowp float uCornerRadiusPolicy;
+uniform highp vec3 uSize;
 
 void main()
 {
   highp vec4 vertexPosition = vec4(aPosition * uSize.xy, 0.0, 1.0);
-  vFragCoord = vertexPosition.xy + uSize.xy/2.0;
   vTexCoord = aPosition + vec2(0.5);
   gl_Position = uMvpMatrix * vertexPosition;
 
   highp float minSize = min(uSize.x, uSize.y);
   vCornerRadius = mix(uCornerRadius * minSize, uCornerRadius, uCornerRadiusPolicy);
   vCornerRadius = min(vCornerRadius, minSize * 0.5);
+
+  vOptRectSize = uSize.xy * 0.5;
+
+  // Optimize fragment shader. 0.2929 ~= 1.0 - sqrt(0.5)
+  highp float maxRadius = max(max(vCornerRadius.x, vCornerRadius.y), max(vCornerRadius.z, vCornerRadius.w));
+  vOptRectSize -= 0.2929 * maxRadius + min(1.0, maxRadius);
 }
-- 
2.7.4