Fields
- fragment_shader: *SDL_GPUShader
- num_sampler_bindings: Sint32
- sampler_bindings: *SDL_GPUTextureSamplerBinding
- num_storage_textures: Sint32
- storage_textures: **SDL_GPUTexture
- num_storage_buffers: Sint32
- storage_buffers: **SDL_GPUBuffer
- props: SDL_PropertiesID