Fields
- src_color_blendfactor: SDL_GPUBlendFactor
- dst_color_blendfactor: SDL_GPUBlendFactor
- color_blend_op: SDL_GPUBlendOp
- src_alpha_blendfactor: SDL_GPUBlendFactor
- dst_alpha_blendfactor: SDL_GPUBlendFactor
- alpha_blend_op: SDL_GPUBlendOp
- color_write_mask: SDL_GPUColorComponentFlags
- enable_blend: bool
- enable_color_write_mask: bool
- padding1: Uint8
- padding2: Uint8