Occlusion Query on Mobile

[yuyangyyu]

Hi, I'm new here, and I'm doing with the occlusion query on mobile. When using the Caps to check the environment support, it always can't work on my mobile (iPhone 13 pm), but it works well on macOS with M1 chip.

I checked some details and found that the struct OcclusionQueryGL uses the GL_SAMPLES_PASSED to check the specific number of passed samples, while it is not supported on OpenGL ES. I tried to use GL_ANY_SAMPLES_PASSED which is supported by OpenGL ES, but the Caps still tell me Occlusion Query can not be used on mobile, so I'm confused about how to implement Occlusion Query on mobile with bgfx, thanks!