demos: Remove tri demo

Removing tri demo for maintenance reasons.  Cube should be the demo
to go to for examples of good Vulkan

Change-Id: I4442a1882b5c168cfe88501eccc41a554ae4d026

.gitignore

@@ -13,8 +13,6 @@ _out64
 out32/*
 out64/*
 demos/Debug/*
-demos/tri.dir/Debug/*
-demos/tri/Debug/*
 demos/Win32/Debug/*
 demos/xcb_nvidia.dir/*
 demos/smoke/HelpersDispatchTable.cpp

BUILD.md

@@ -71,7 +71,6 @@ There are also a few shell and Python scripts that run test collections (eg,
 
 Some demos that can be found in the dbuild/demos directory are:
 - vulkaninfo: report GPU properties
-- tri: a textured triangle (which is animated to demonstrate Z-clipping)
 - cube: a textured spinning cube
 - smoke/smoke: A "smoke" test using a more complex Vulkan demo
 
@@ -183,11 +182,8 @@ cd demos/android
 android update project -s -p . -t "android-23"
 ndk-build
 ant -buildfile cube debug
-ant -buildfile tri debug
 adb install ./cube/bin/NativeActivity-debug.apk
-adb install ./tri/bin/NativeActivity-debug.apk
 adb shell am start com.example.Cube/android.app.NativeActivity
-adb shell am start com.example.Tri/android.app.NativeActivity
 ```
 To build, install, and run Cube with validation layers, first build layers using steps above, then run:
 ```

CONTRIBUTING.md

@@ -66,8 +66,6 @@ later on this page.
 
 >        cube
 >        cube --validate
->        tri
->        tri --validate
 >        smoke
 >        smoke --validate
 >        vulkaninfo