Increase precision in rounded corner shader

Otherwise, there's some floating point error when the corner radius is
large. In testing, this is the smallest change that allows for
rendering reasonably correct corners.

Bug: 129866411
Test: launcher animation
Change-Id: I5c016b6454e9fb9b4d5ed6e42e36c23da83430a8

1 files changed, 3 insertions, 1 deletions

diff --git a/libs/renderengine/gl/ProgramCache.cpp b/libs/renderengine/gl/ProgramCache.cpp
index cd1182c89a..086a324999 100644
--- a/libs/renderengine/gl/ProgramCache.cpp
+++ b/libs/renderengine/gl/ProgramCache.cpp
@@ -575,7 +575,9 @@ String8 ProgramCache::generateFragmentShader(const Key& needs) {
             float applyCornerRadius(vec2 cropCoords)
             {
                 vec2 position = cropCoords - cropCenter;
-                vec2 dist = abs(position) + vec2(cornerRadius) - cropCenter;
+                // Increase precision here so that a large corner radius doesn't
+                // cause floating point error
+                highp vec2 dist = abs(position) + vec2(cornerRadius) - cropCenter;
                 float plane = length(max(dist, vec2(0.0)));
                 return 1.0 - clamp(plane - cornerRadius, 0.0, 1.0);
             }