This is the first part of the Stage3D implementation, and can
be reviewed independently.
Stage3D shaders use the Adobe Graphics Assembly Language (AGAL),
which is a binary shader format. It supports vertex attributes,
varying registers, program constants (uniforms), and texture sampling.
This PR only implements a few parts of AGAL:
* The 'mov' and 'm44' opcodes
* Vertex attributes, varying registers, program constants, and 'output'
registers (position or color, depending on shader type)
This is sufficient to get a non-trivial Stage3D program
running (the rotating cube demo from the Adobe docs).
The output of `naga-agal` is a `naga::Module`. This can be passed
directly to wgpu, or compiled into a shader language using
a Naga backend (glsl, wgsl, SPIR-V, etc). The test suite
output WGSL files, and uses the 'insta' crate to compare against
saved files on disk.
Currently, the only real way to write AGAL bytecode is using
the Adobe-provided 'AGALMiniAssembler' flash class.
This class assembles the textual reprentation of AGAL into
the binary format.
To make writing tests easier, I've added a 'agal_compiler' test, which
can easily be modified to add more Agal textual assembly.
This PR fixes a numbe of interconnected bugs:
* We weren't consistently uploading a dirty BitmapData to the render
backend before drawing to/from it.
* BitmapData.draw should *not* add a fill color - it should draw over
the current contents of the BitmapData
* After drawing to a non-transparent BitmapData, we need to manually
set the opacity back to 255 for each pixel (the drawing process
takes transparency into account, but the opacity information is
thrown away at the end).
Change `Bitmap::new()` to accept a `ruffle_render::bitmap::Bitmap`
directly, instead of `width`, `height` and `bitmap_handle`. As a
consequence, all `RenderBackend::register_bitmap_*` methods are no
longer necessary - we can use `ruffle_redner::utils::*` to obtain
a `ruffle_render::bitmap::Bitmap` right before calling `Bitmap::new()`.
And make it generic, as a first step towards making it a general-purpose
data structure for the whole codebase. Some potential replacements are:
* `BoundingBox` in `render/src/bounding_box.rs`.
* `BoxBounds` in `core/src/html/dimensions.rs`.
* Parameters to a bunch of `BitmapData` methods in
`core/src/bitmap/bitmap_data.rs`.
Main changes:
* Merge `ColorTransformParams` into `ColorTransformObject`, as it's only relevant for AVM1.
* Make `BitmapData::color_transform` work with a generic `ColorTransform`, which uses fixed-point
arithmetic.
Note that Ruffle still calculates color transforms slightly different from Flash. This is probably
caused by inaccuracy of the current `ColorTransformObject` to `ColorTransform` conversion and/or the
`ColorTransform` application logic itself. Since this requires further research, it'll be fixed in a
future PR.
As usual, also bump its helper crates (`js-sys`, `web-sys` and
`wasm-bindgen-futures`) to the latest versions.
Due to https://github.com/rustwasm/wasm-bindgen/pull/3031, use the
`serde-wasm-bindgen` crate as a replacement to the deprecated
`JsValue::from_serde` function.
In several cases, the current code seems preferable to the
code required by `clippy::bool_to_int_with_if`. Let's suppress
this for now to get the build passing, and decide later if this
is something that we want to enable.