ui: brighten cameraview (#29744)

* test

* test2

* Revert "test2"

This reverts commit 22e38f82ae.

* Revert "test"

This reverts commit 717490c1bc.

* looks fine

* mid

* description

---------

Co-authored-by: Comma Device <device@comma.ai>
old-commit-hash: a08cdfdda7

selfdrive/ui/qt/widgets/cameraview.cc

@@ -41,6 +41,8 @@ const char frame_fragment_shader[] =
   "out vec4 colorOut;\n"
   "void main() {\n"
   "  colorOut = texture(uTexture, vTexCoord);\n"
+  // gamma to improve worst case visibility when dark
+  "  colorOut.rgb = pow(colorOut.rgb, vec3(1.0/1.28));\n"
   "}\n";
 #else
 const char frame_fragment_shader[] =