API to accept and use precompiled shader about ebiten HOT 5 OPEN

Hello. Consider adding an API to use your shaders.
Without a doubt, this feature will be for experienced developers and will open the way to the world of shaders. Naga, wgsl and other community tools. I like Kage, but it's good to have an alternative..

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I'm afraid this suggestion is not for enabling other languages than Kage

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To minimize an impact of the existing APIs, I suggest this API:

// AddPrecompiledShader adds a pair of a shader source and a shader binary.
// When a new shader is created by NewShader,
// Ebitengine tries to seek the pair that has the same shader source.
// If there is such a pair, Ebitengine uses a registered shader binary for the same shader source instead of compiling it.
//
// AddPrecompiledShader is useful to shoten the shader compile time, or even necessary in an environment
// where you cannot compile a shader on the fly.
func AddPrecompiledShader(kageShaderSource []byte, nativeShaderBinary []byte, graphicsLibrary GraphicsLibrary) error

EDIT: Hmm, how can we treat vertex shader?

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OpenGL: It is impossible to precompile shaders. AddPrecompiledShader should always return an error.

DirectX: A native shader binary is the result of D3DCompile. This function returns ID3DBlob, and this can be converted to a byte slice, and be created via D3DCreateBlob. A vertex shader and a pixel shader are separated.

Metal: A native shader binary is a .metallib format. This can be used at makeLibrary for NSData. See also https://developer.apple.com/documentation/metal/shader_libraries/building_a_shader_library_by_precompiling_source_files. A vertex shader and a fragment shader are NOT separated. So, Ebitengine would have to expose the binary for a vertex shader? Hmm.

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Instead of exposing the the vertex shader, would this work?

func CompileShaderToNativeSource(kageShaderSource []byte, graphicsLibrary GraphicsLibrary) ([]byte, error)

// Compiling a native source to a native binary is a developer's responsibility.

func AddPrecompiledShader(kageShaderSource []byte, nativeShaderBinary []byte, graphicsLibrary GraphicsLibrary) error

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