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63096b2042
even faster. * GPU based version started in previous commit, but this fixes errors and bugs and gets it actually compiling and running. * Add a way to batch together images to use the same render pass for GPU premultiplication if they all target the same texture. * Pending premultiplication uploads are automatically done when calling `Drawer::third_pass`. * `fast-srgb8` dep removed, we no longer convert to `f32`s to do the premultiplication. Two `[u16; 256]` tables are combined to compute the alpa premultiplied color within the same error bounds used by the `fast-srgb8` crate. We also no longer use explicit simd. * Remove explicit lifetimes from `PlayState::render` since `&self` and `Drawer<'_>` don't need to have the same lifetime. * Fix existing bug where invalidated cache entries were never set to valid when reusing them. * `prepare_graphic` now runs some heuristics to determine whether premultiplication should be executed CPU side or GPU side and then returns a bool indicating if GPU premultiplication is needed.
