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get pixel size from wgpu (#6820)

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# Objective

- Get rid of giant match statement to get PixelInfo. 
- This will allow for supporting any texture that is uncompressed, instead of people needing to PR in any textures that are supported in wgpu, but not bevy.

## Solution

- More conservative alternative to https://github.com/bevyengine/bevy/pull/6788, where we don't try to make some of the calculations correct for compressed types.
- Delete `PixelInfo` and get the pixel_size directly from wgpu. Data from wgpu is here: https://docs.rs/wgpu-types/0.14.0/src/wgpu_types/lib.rs.html#2359
- Panic if the texture is a compressed type. An integer byte size of a pixel is no longer a valid concept when talking about compressed textures.
- All internal usages use `pixel_size` and not `pixel_info` and are on uncompressed formats. Most of these usages are on either explicit texture formats or slightly indirectly through `TextureFormat::bevy_default()`. The other uses are in `TextureAtlas` and have other calculations that assumes the texture is uncompressed. 

## Changelog

- remove `PixelInfo` and get `pixel_size` from wgpu

## Migration Guide

`PixelInfo` has been removed. `PixelInfo::components` is equivalent to `texture_format.describe().components`. `PixelInfo::type_size` can be gotten from `texture_format.describe().block_size/ texture_format.describe().components`. But note this can yield incorrect results for some texture types like Rg11b10Float.
This commit is contained in:
Mike 2022-12-11 18:22:07 +00:00
parent 2e7925d8d0
commit 6903a9411b
1 changed files with 7 additions and 123 deletions
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130
crates/bevy_render/src/texture/image.rs
View file

@ -464,134 +464,18 @@ impl Volume for Extent3d {
}
}
/// Information about the pixel size in bytes and the number of different components.
pub struct PixelInfo {
/// The size of a component of a pixel in bytes.
pub type_size: usize,
/// The amount of different components (color channels).
pub num_components: usize,
}
/// Extends the wgpu [`TextureFormat`] with information about the pixel.
pub trait TextureFormatPixelInfo {
/// Returns the pixel information of the format.
fn pixel_info(&self) -> PixelInfo;
/// Returns the size of a pixel of the format.
fn pixel_size(&self) -> usize {
let info = self.pixel_info();
info.type_size * info.num_components
}
/// Returns the size of a pixel in bytes of the format.
fn pixel_size(&self) -> usize;
}
impl TextureFormatPixelInfo for TextureFormat {
#[allow(clippy::match_same_arms)]
fn pixel_info(&self) -> PixelInfo {
let type_size = match self {
// 8bit
TextureFormat::R8Unorm
| TextureFormat::R8Snorm
| TextureFormat::R8Uint
| TextureFormat::R8Sint
| TextureFormat::Rg8Unorm
| TextureFormat::Rg8Snorm
| TextureFormat::Rg8Uint
| TextureFormat::Rg8Sint
| TextureFormat::Rgba8Unorm
| TextureFormat::Rgba8UnormSrgb
| TextureFormat::Rgba8Snorm
| TextureFormat::Rgba8Uint
| TextureFormat::Rgba8Sint
| TextureFormat::Bgra8Unorm
| TextureFormat::Bgra8UnormSrgb => 1,
// 16bit
TextureFormat::R16Uint
| TextureFormat::R16Sint
| TextureFormat::R16Float
| TextureFormat::R16Unorm
| TextureFormat::Rg16Uint
| TextureFormat::Rg16Sint
| TextureFormat::Rg16Unorm
| TextureFormat::Rg16Float
| TextureFormat::Rgba16Uint
| TextureFormat::Rgba16Sint
| TextureFormat::Rgba16Float => 2,
// 32bit
TextureFormat::R32Uint
| TextureFormat::R32Sint
| TextureFormat::R32Float
| TextureFormat::Rg32Uint
| TextureFormat::Rg32Sint
| TextureFormat::Rg32Float
| TextureFormat::Rgba32Uint
| TextureFormat::Rgba32Sint
| TextureFormat::Rgba32Float
| TextureFormat::Depth32Float => 4,
// special cases
TextureFormat::Rgb9e5Ufloat => 4,
TextureFormat::Rgb10a2Unorm => 4,
TextureFormat::Rg11b10Float => 4,
TextureFormat::Depth24Plus => 3, // FIXME is this correct?
TextureFormat::Depth24PlusStencil8 => 4,
// TODO: this is not good! this is a temporary step while porting bevy_render to direct wgpu usage
_ => panic!("cannot get pixel info for type"),
};
let components = match self {
TextureFormat::R8Unorm
| TextureFormat::R8Snorm
| TextureFormat::R8Uint
| TextureFormat::R8Sint
| TextureFormat::R16Uint
| TextureFormat::R16Sint
| TextureFormat::R16Unorm
| TextureFormat::R16Float
| TextureFormat::R32Uint
| TextureFormat::R32Sint
| TextureFormat::R32Float => 1,
TextureFormat::Rg8Unorm
| TextureFormat::Rg8Snorm
| TextureFormat::Rg8Uint
| TextureFormat::Rg8Sint
| TextureFormat::Rg16Uint
| TextureFormat::Rg16Sint
| TextureFormat::Rg16Unorm
| TextureFormat::Rg16Float
| TextureFormat::Rg32Uint
| TextureFormat::Rg32Sint
| TextureFormat::Rg32Float => 2,
TextureFormat::Rgba8Unorm
| TextureFormat::Rgba8UnormSrgb
| TextureFormat::Rgba8Snorm
| TextureFormat::Rgba8Uint
| TextureFormat::Rgba8Sint
| TextureFormat::Bgra8Unorm
| TextureFormat::Bgra8UnormSrgb
| TextureFormat::Rgba16Uint
| TextureFormat::Rgba16Sint
| TextureFormat::Rgba16Float
| TextureFormat::Rgba32Uint
| TextureFormat::Rgba32Sint
| TextureFormat::Rgba32Float => 4,
// special cases
TextureFormat::Rgb9e5Ufloat
| TextureFormat::Rgb10a2Unorm
| TextureFormat::Rg11b10Float
| TextureFormat::Depth32Float
| TextureFormat::Depth24Plus
| TextureFormat::Depth24PlusStencil8 => 1,
// TODO: this is not good! this is a temporary step while porting bevy_render to direct wgpu usage
_ => panic!("cannot get pixel info for type"),
};
PixelInfo {
type_size,
num_components: components,
fn pixel_size(&self) -> usize {
let info = self.describe();
match info.block_dimensions {
(1, 1) => info.block_size.into(),
_ => panic!("Using pixel_size for compressed textures is invalid"),
}
}
}