icb 的支持平台

MTLFeatureSet_iOS_GPUFamily4_v2

A11

iphone8 iphone8pllus iphoneX

https://developer.apple.com/documentation/metal/indirect_command_buffers/encoding_indirect_command_buffers_on_the_gpu

vulkan

https://www.khronos.org/registry/vulkan/specs/1.1-extensions/html/chap30.html#device-generated-commands

Direct3D11 DrawIndexedInstancedIndirect

OpenGL versions before 4.2

OpenGL ES versions that support indirect draw, the last argument is reserved and therefore must be zero.

Shader Model 4.5 

#pragma target 4.5 (or es3.1)

• OpenGL ES 3.1 capabilities (DX11 SM5.0 on D3D platforms, just without tessellation shaders).
• Not supported on DX11 before SM5.0, OpenGL before 4.3 (i.e. Mac), OpenGL ES 2.0/3.0.
• Supported on DX11+ SM5.0, OpenGL 4.3+, OpenGL ES 3.1, Metal, Vulkan, PS4/XB1 consoles.
• Has compute shaders, random access texture writes, atomics and so on. No geometry or tessellation shaders.

https://docs.unity3d.com/ScriptReference/Rendering.CommandBuffer.DrawProceduralIndirect.html

https://docs.unity3d.com/Manual/SL-ShaderCompileTargets.html

也就是说 如果做gpu driven

iphone8起