GPU Alpha Masking for Animated Image Visual

[platform/core/uifw/dali-toolkit.git] / dali-toolkit / internal / graphics / shaders / image-visual-shader.vert

diff --git a/dali-toolkit/internal/graphics/shaders/image-visual-shader.vert b/dali-toolkit/internal/graphics/shaders/image-visual-shader.vert
index 21d4084..d563c78 100644 (file)
--- a/dali-toolkit/internal/graphics/shaders/image-visual-shader.vert
+++ b/dali-toolkit/internal/graphics/shaders/image-visual-shader.vert
@@ -4,6 +4,9 @@
 #ifndef IS_REQUIRED_BORDERLINE
 #define IS_REQUIRED_BORDERLINE 0
 #endif
+#ifndef IS_REQUIRED_ALPHA_MASKING
+#define IS_REQUIRED_ALPHA_MASKING 0
+#endif
 
 INPUT mediump vec2 aPosition;
 OUTPUT mediump vec2 vTexCoord;
@@ -34,6 +37,11 @@ uniform mediump float borderlineOffset;
 uniform mediump vec4 cornerRadius;
 uniform mediump float cornerRadiusPolicy;
 #endif
+#if IS_REQUIRED_ALPHA_MASKING
+OUTPUT  mediump vec2  vMaskTexCoord;
+uniform lowp    float cropToMask;
+uniform mediump vec2  maskTextureRatio;
+#endif
 uniform mediump vec2 extraSize;
 
 vec4 ComputeVertexPosition()
@@ -68,7 +76,18 @@ vec4 ComputeVertexPosition()
   mediump vec2 vPosition = aPosition * visualSize;
 #endif
 
-  vTexCoord = pixelArea.xy + pixelArea.zw * (vPosition.xy / max(vec2(1.0), visualSize) + vec2(0.5));
+  vec4 finalPixelArea = pixelArea;
+#if IS_REQUIRED_ALPHA_MASKING
+  finalPixelArea = mix(pixelArea,
+                       vec4(
+                            vec2(0.5) + (pixelArea.xy - vec2(0.5)) * maskTextureRatio,
+                            pixelArea.zw * maskTextureRatio
+                       ),
+                       cropToMask);
+  vMaskTexCoord = pixelArea.xy + pixelArea.zw * (vPosition.xy / max(vec2(1.0), visualSize) + vec2(0.5));
+#endif
+  vTexCoord = finalPixelArea.xy + finalPixelArea.zw * (vPosition.xy / max(vec2(1.0), visualSize) + vec2(0.5));
+
   return vec4(vPosition + anchorPoint * visualSize + (visualOffset + origin) * uSize.xy, 0.0, 1.0);
 }