Fixed shadows not respecting offset (#63)

1 files changed, 5 insertions, 1 deletions

diff --git a/render/fx_renderer/gles2/shaders/box_shadow.frag b/render/fx_renderer/gles2/shaders/box_shadow.frag
index e98cf92..d318c93 100644
--- a/render/fx_renderer/gles2/shaders/box_shadow.frag
+++ b/render/fx_renderer/gles2/shaders/box_shadow.frag
@@ -11,6 +11,7 @@ varying vec2 v_texcoord;
 
 uniform vec2 position;
 uniform vec2 size;
+uniform vec2 offset;
 uniform float blur_sigma;
 uniform float corner_radius;
 
@@ -80,7 +81,10 @@ void main() {
     shadow_alpha += (random() - 0.5) / 128.0;
 
     // get the window alpha so we can render around the window
-    float window_alpha = 1.0 - smoothstep(-1.0, 1.0, roundRectSDF((size * 0.5) - blur_sigma, position + blur_sigma, corner_radius));
+    float window_alpha = 1.0 - smoothstep(-1.0, 1.0,
+        roundRectSDF((size * 0.5) - blur_sigma,
+            vec2(position.x + blur_sigma - offset.x, position.y + blur_sigma - offset.y),
+            corner_radius));
 
     gl_FragColor = vec4(v_color.rgb, shadow_alpha) * (1.0 - window_alpha);
 }