https://github.com/android/platform-samples/blob/ce4c345033e42a354a87fd5f7fc73f5518c32499/samples/graphics/ultrahdr/src/main/java/com/example/platform/graphics/ultrahdr/opengl/UltraHDRWithOpenGL.kt would be a good thing to create an NDK equivalent of. It does what the old display-p3 sample did, but does it right, and also does HDR.
https://github.com/android/platform-samples/blob/ce4c345033e42a354a87fd5f7fc73f5518c32499/samples/graphics/ultrahdr/src/main/java/com/example/platform/graphics/ultrahdr/opengl/UltraHDRWithOpenGL.kt would be a good thing to create an NDK equivalent of. It does what the old display-p3 sample did, but does it right, and also does HDR.