From cf00a333060471f381ffd6529507ae1e701f30d2 Mon Sep 17 00:00:00 2001
From: "Eunki, Hong" <eunkiki.hong@samsung.com>
Date: Fri, 22 Jan 2021 18:20:05 +0900
Subject: [PATCH] ColorVisual can use both BLUR_RADIUS and CORNER_RADIUS

modify shader to use blur_radius and corner_radius both of them

Change-Id: I65315709a7dff4e574f645b370c950e03d00fcfe
Signed-off-by: Eunki, Hong <eunkiki.hong@samsung.com>
---
 .../shaders/color-visual-blur-edge-shader.frag     | 55 ++++++++++++++++++++--
 .../shaders/color-visual-blur-edge-shader.vert     | 16 +++++--
 2 files changed, 63 insertions(+), 8 deletions(-)

diff --git a/dali-toolkit/internal/graphics/shaders/color-visual-blur-edge-shader.frag b/dali-toolkit/internal/graphics/shaders/color-visual-blur-edge-shader.frag
index f2025a7..df817b2 100644
--- a/dali-toolkit/internal/graphics/shaders/color-visual-blur-edge-shader.frag
+++ b/dali-toolkit/internal/graphics/shaders/color-visual-blur-edge-shader.frag
@@ -1,5 +1,6 @@
 INPUT mediump vec2 vPosition;
 INPUT mediump vec2 vRectSize;
+INPUT mediump float vCornerRadius;
 
 uniform lowp vec4 uColor;
 uniform lowp vec3 mixColor;
@@ -7,7 +8,55 @@ uniform mediump float blurRadius;
 
 void main()
 {
-  mediump vec2 blur = 1.0 - smoothstep( vRectSize - blurRadius * 2.0, vRectSize, abs( vPosition ) );
   OUT_COLOR = vec4(mixColor, 1.0) * uColor;
-  OUT_COLOR.a *= blur.x * blur.y;
-}
\ No newline at end of file
+
+  mediump vec2 v = abs(vPosition) - vRectSize;
+  mediump float cy = vCornerRadius + blurRadius;
+  mediump float cr = vCornerRadius + blurRadius;
+
+  cy = min(cy, min(vRectSize.x, vRectSize.y));
+  v = vec2(min(v.x, v.y), max(v.x, v.y));
+  v = v + cy;
+
+  mediump float blur = 1.0;
+  mediump float potential = 0.0;
+  mediump float alias = min(vCornerRadius, 1.0);
+  mediump float potentialMin = cy + vCornerRadius - blurRadius - alias;
+  mediump float potentialMax = cy + vCornerRadius + blurRadius + alias;
+
+  // move center of circles for reduce defact
+  mediump float cyDiff = min(cy, 0.2 * blurRadius);
+  cy -= cyDiff;
+  cr += cyDiff;
+
+  mediump float diffFromBaseline = cy * v.y - (cy + cr) * v.x;
+
+  if(diffFromBaseline > 0.0)
+  {
+    // out of calculation bound.
+    potential = v.y;
+
+    // for anti-alias when blurRaidus = 0.0
+    mediump float heuristicBaselineScale = max(1.0 , cr * (cr + cy));
+    mediump float potentialDiff = min(alias, diffFromBaseline / heuristicBaselineScale);
+    potentialMin += potentialDiff;
+    potentialMax -= potentialDiff;
+  }
+  else
+  {
+    // get some circle centered (x, x) and radius (r = cr / cy * x)
+    // s.t. point v is on that circle
+    // highest point of that circle is (x, x + r) and potential is x + r
+
+    // solve (v.x - x)^2 + (v.y - x)^2 = (cr / cy * x)^2
+
+    mediump float A = (cr * cr - 2.0 * cy * cy);
+    mediump float B = cy * (v.x + v.y);
+    mediump float V = dot(v,v);
+    mediump float D = B * B + A * V;
+    potential = V * (cr + cy) / (sqrt(D) + B);
+  }
+
+  blur = 1.0 - smoothstep(potentialMin, potentialMax, potential);
+  OUT_COLOR.a *= blur;
+}
diff --git a/dali-toolkit/internal/graphics/shaders/color-visual-blur-edge-shader.vert b/dali-toolkit/internal/graphics/shaders/color-visual-blur-edge-shader.vert
index 65849eb..e20110b 100644
--- a/dali-toolkit/internal/graphics/shaders/color-visual-blur-edge-shader.vert
+++ b/dali-toolkit/internal/graphics/shaders/color-visual-blur-edge-shader.vert
@@ -1,8 +1,9 @@
 INPUT mediump vec2 aPosition;
 OUTPUT mediump vec2 vPosition;
 OUTPUT mediump vec2 vRectSize;
+OUTPUT mediump float vCornerRadius;
 
-uniform highp   mat4 uMvpMatrix;
+uniform highp mat4 uMvpMatrix;
 uniform highp vec3 uSize;
 
 //Visual size and offset
@@ -13,17 +14,22 @@ uniform mediump vec4 offsetSizeMode;
 uniform mediump vec2 origin;
 uniform mediump vec2 anchorPoint;
 uniform mediump float blurRadius;
+uniform mediump float cornerRadius;
+uniform mediump float cornerRadiusPolicy;
 
 vec4 ComputeVertexPosition()
 {
-  vec2 visualSize = mix(uSize.xy*size, size, offsetSizeMode.zw ) + extraSize + blurRadius * 2.0;
+  vec2 visualSize = mix(uSize.xy*size, size, offsetSizeMode.zw ) + extraSize;
   vec2 visualOffset = mix( offset, offset/uSize.xy, offsetSizeMode.xy);
-  vRectSize = visualSize / 2.0;
-  vPosition = aPosition* visualSize;
+  mediump float minSize = min( visualSize.x, visualSize.y );
+  vCornerRadius = mix( cornerRadius * minSize, cornerRadius, cornerRadiusPolicy );
+  vCornerRadius = min( vCornerRadius, minSize * 0.5 );
+  vRectSize = visualSize / 2.0 - vec2( vCornerRadius );
+  vPosition = aPosition * (visualSize + 2.0 * blurRadius);
   return vec4( vPosition + anchorPoint*visualSize + (visualOffset + origin)*uSize.xy, 0.0, 1.0 );
 }
 
 void main()
 {
   gl_Position = uMvpMatrix * ComputeVertexPosition();
-}
\ No newline at end of file
+}
-- 
2.7.4